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branch : static-ernie-html5-buttontoggle
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Kyle Fiedler
2012-02-15 09:10:15 -05:00
parent f969faa0d4 95e463c6ae
commit 2dcdaccb97
5 changed files with 1858 additions and 5577 deletions
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2242
css/application.css
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9
css/marketing.css
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@@ -147,7 +147,8 @@ input, select {
.subpage > div, section.copyright > div, section.tos > div, section.privacy-policy > div, section.honor-code > div {
padding-left: 0; } }
.subpage > div p, section.copyright > div p, section.tos > div p, section.privacy-policy > div p, section.honor-code > div p {
margin-bottom: 25.888px; }
margin-bottom: 25.888px;
line-height: 25.888px; }
.subpage > div h1, section.copyright > div h1, section.tos > div h1, section.privacy-policy > div h1, section.honor-code > div h1 {
margin-bottom: 12.944px; }
.subpage > div h2, section.copyright > div h2, section.tos > div h2, section.privacy-policy > div h2, section.honor-code > div h2 {
@@ -157,7 +158,8 @@ input, select {
.subpage > div ul, section.copyright > div ul, section.tos > div ul, section.privacy-policy > div ul, section.honor-code > div ul {
list-style: disc outside none; }
.subpage > div ul li, section.copyright > div ul li, section.tos > div ul li, section.privacy-policy > div ul li, section.honor-code > div ul li {
list-style: disc outside none; }
list-style: disc outside none;
line-height: 25.888px; }
.clearfix:after, .subpage:after, section.copyright:after, section.tos:after, section.privacy-policy:after, section.honor-code:after, header.announcement div section:after, section.index-content:after, section.index-content section:after, section.index-content section.about section:after, footer:after, div.leanModal_box#enroll ol:after {
content: ".";
@@ -269,9 +271,6 @@ header.announcement {
-webkit-font-smoothing: antialiased; }
header.announcement.home {
background: #e3e3e3 url("/static/images/marketing/shot-5-medium.jpg"); }
@media screen and (min-width: 1200px) {
header.announcement.home {
background: #e3e3e3 url("/static/images/marketing/shot-5-large.jpg"); } }
header.announcement.home div {
padding: 258.88px 25.888px 77.664px; }
header.announcement.home div nav h1 {

16
css/print.css
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@@ -1,6 +1,10 @@
.header-wrapper {display:none;}
#accordion {display:none;}
.ui-accordion {display:none;
visibility:hidden;
width:0%;
}
.header-wrapper {
display: none; }
#accordion {
display: none; }
.ui-accordion {
display: none;
visibility: hidden;
width: 0%; }

1631
js/cktsim.js
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@@ -1,1631 +0,0 @@
//////////////////////////////////////////////////////////////////////////////
//
// Circuit simulator
//
//////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2011 Massachusetts Institute of Technology
// create a circuit for simulation using "new cktsim.Circuit()"
// for modified nodal analysis (MNA) stamps see
// http://www.analog-electronics.eu/analog-electronics/modified-nodal-analysis/modified-nodal-analysis.xhtml
cktsim = (function() {
///////////////////////////////////////////////////////////////////////////////
//
// Circuit
//
//////////////////////////////////////////////////////////////////////////////
// types of "nodes" in the linear system
T_VOLTAGE = 0;
T_CURRENT = 1;
v_newt_lim = 0.3; // Voltage limited Newton great for Mos/diodes
v_abstol = 1e-6; // criterion for absolute convergence (voltage)
i_abstol = 1e-12; // criterion for absolute convergence (current)
min_time_step = 1e-18; // smallest possible time step
max_dc_iters = 200; // max iterations before giving pu
max_tran_iters = 10; // max iterations before giving up
increase_limit = 4; // if we converge in this many iterations, increase time step
time_step_increase_factor = 2.0; // How much can lte let timestep grow.
lte_step_decrease_factor = 8; // How much will lte shrink timestep in one iter.
nr_step_decrease_factor = 4; // How much Newton will shink timeste in one iter.
reltol = 0.0001; // convergence criterion relative to max observed value
lterel = 4; // The ratio between lte error and Newton error.
function Circuit() {
this.node_map = new Array();
this.ntypes = [];
this.initial_conditions = []; // ic's for each element
this.devices = []; // list of devices
this.device_map = new Array(); // map name -> device
this.voltage_sources = []; // list of voltage sources
this.finalized = false;
this.diddc = false;
this.node_index = -1;
}
// index of ground node
Circuit.prototype.gnd_node = function() {
return -1;
}
// allocate a new node index
Circuit.prototype.node = function(name,ntype,ic) {
this.node_index += 1;
if (name) this.node_map[name] = this.node_index;
this.ntypes.push(ntype);
this.initial_conditions.push(ic);
return this.node_index;
}
// call to finalize the circuit in preparation for simulation
Circuit.prototype.finalize = function() {
if (!this.finalized) {
this.finalized = true;
this.N = this.node_index + 1; // number of nodes
// give each device a chance to finalize itself
for (var i = this.devices.length - 1; i >= 0; --i)
this.devices[i].finalize(this);
// set up augmented matrix and various temp vectors
this.matrix = this.make_mat(this.N, this.N+1);
this.Gl = this.make_mat(this.N, this.N); // Matrix for linear conductances
this.G = this.make_mat(this.N, this.N); // Complete conductance matrix
this.C = this.make_mat(this.N, this.N); // Matrix for linear L's and C's
this.soln_max = new Array(this.N); // max abs value seen for each unknown
this.abstol = new Array(this.N);
this.solution = new Array(this.N);
this.rhs = new Array(this.N);
for (var i = this.N - 1; i >= 0; --i) {
this.soln_max[i] = 0.0;
this.abstol[i] = this.ntypes[i] == T_VOLTAGE ? v_abstol : i_abstol;
this.solution[i] = 0.0;
this.rhs[i] = 0.0;
}
}
}
// load circuit from JSON netlist (see schematic.js)
Circuit.prototype.load_netlist = function(netlist) {
// set up mapping for all ground connections
for (var i = netlist.length - 1; i >= 0; --i) {
var component = netlist[i];
var type = component[0];
if (type == 'g') {
var connections = component[3];
this.node_map[connections[0]] = this.gnd_node();
}
}
// process each component in the JSON netlist (see schematic.js for format)
var found_ground = false;
for (var i = netlist.length - 1; i >= 0; --i) {
var component = netlist[i];
var type = component[0];
// ignore wires, ground connections, scope probes and view info
if (type == 'view' || type == 'w' || type == 'g' || type == 's' || type == 'L') {
continue;
}
var properties = component[2];
var name = properties['name'];
if (name==undefined || name=='')
name = '_' + properties['_json_'].toString();
// convert node names to circuit indicies
var connections = component[3];
for (var j = connections.length - 1; j >= 0; --j) {
var node = connections[j];
var index = this.node_map[node];
if (index == undefined) index = this.node(node,T_VOLTAGE);
else if (index == this.gnd_node()) found_ground = true;
connections[j] = index;
}
// process the component
if (type == 'r') // resistor
this.r(connections[0],connections[1],properties['r'],name);
else if (type == 'd') // diode
this.d(connections[0],connections[1],properties['area'],name);
else if (type == 'c') // capacitor
this.c(connections[0],connections[1],properties['c'],name);
else if (type == 'l') // inductor
this.l(connections[0],connections[1],properties['l'],name);
else if (type == 'v') // voltage source
this.v(connections[0],connections[1],properties['value'],name);
else if (type == 'i') // current source
this.i(connections[0],connections[1],properties['value'],name);
else if (type == 'o') // op amp
this.opamp(connections[0],connections[1],connections[2],connections[3],properties['A'],name);
else if (type == 'n') // n fet
this.n(connections[0],connections[1],connections[2],properties['W/L'],name);
else if (type == 'p') // p fet
this.p(connections[0],connections[1],connections[2],properties['W/L'],name);
}
if (!found_ground) { // No ground on schematic
alert('Please make at least one connection to ground (inverted T symbol)');
return false;
}
return true;
}
// if converges: updates this.solution, this.soln_max, returns iter count
// otherwise: return undefined and set this.problem_node
// Load should compute -f and df/dx (note the sign pattern!)
Circuit.prototype.find_solution = function(load,maxiters) {
var soln = this.solution;
var rhs = this.rhs;
var d_sol,converged;
// iteratively solve until values convere or iteration limit exceeded
for (var iter = 0; iter < maxiters; iter++) {
// set up equations
load(this,soln,rhs);
// Compute the Newton delta
d_sol = solve_linear_system(this.matrix,rhs);
// Update solution and check convergence.
converged = true;
for (var i = this.N - 1; i >= 0; --i) {
// Simple voltage step limiting to encourage Newton convergence
if (this.ntypes[i] == T_VOLTAGE) {
d_sol[i] = (d_sol[i] > v_newt_lim) ? v_newt_lim : d_sol[i];
d_sol[i] = (d_sol[i] < -v_newt_lim) ? -v_newt_lim : d_sol[i];
}
soln[i] += d_sol[i];
if (Math.abs(soln[i]) > this.soln_max[i])
this.soln_max[i] = Math.abs(soln[i]);
thresh = this.abstol[i] + reltol*this.soln_max[i];
if (Math.abs(d_sol[i]) > thresh) {
converged = false;
this.problem_node = i;
}
}
//alert(numeric.prettyPrint(this.solution);)
if (converged == true) return iter+1;
}
// too many iterations
return undefined;
}
// DC analysis
Circuit.prototype.dc = function() {
// Allocation matrices for linear part, etc.
this.finalize();
// Load up the linear part.
for (var i = this.devices.length - 1; i >= 0; --i) {
this.devices[i].load_linear(this)
}
// Define -f and df/dx for Newton solver
function load_dc(ckt,soln,rhs) {
// rhs is initialized to -Gl * soln
ckt.matv_mult(ckt.Gl, soln, rhs, -1.0);
// G matrix is initialized with linear Gl
ckt.copy_mat(ckt.Gl,ckt.G);
// Now load up the nonlinear parts of rhs and G
for (var i = ckt.devices.length - 1; i >= 0; --i)
ckt.devices[i].load_dc(ckt,soln,rhs);
// G matrix is copied in to the system matrix
ckt.copy_mat(ckt.G,ckt.matrix);
}
// find the operating point
var iterations = this.find_solution(load_dc,max_dc_iters);
if (typeof iterations == 'undefined') {
return 'Node '+this.node_map[this.problem_node]+' unconverged';
} else {
// Note that a dc solution was computed
this.diddc = true;
// create solution dictionary
var result = new Array();
// capture node voltages
for (var name in this.node_map) {
var index = this.node_map[name];
result[name] = (index == -1) ? 0 : this.solution[index];
}
// capture branch currents from voltage sources
for (var i = this.voltage_sources.length - 1; i >= 0; --i) {
var v = this.voltage_sources[i];
result['I('+v.name+')'] = this.solution[v.branch];
}
return result;
}
}
// Transient analysis (needs work!)
Circuit.prototype.tran = function(ntpts, tstart, tstop, probenames, no_dc) {
// Define -f and df/dx for Newton solver
function load_tran(ckt,soln,rhs) {
// Crnt is initialized to -Gl * soln
ckt.matv_mult(ckt.Gl, soln, ckt.c,-1.0);
// G matrix is initialized with linear Gl
ckt.copy_mat(ckt.Gl,ckt.G);
// Now load up the nonlinear parts of crnt and G
for (var i = ckt.devices.length - 1; i >= 0; --i)
ckt.devices[i].load_tran(ckt,soln,ckt.c,ckt.time);
// Exploit the fact that storage elements are linear
ckt.matv_mult(ckt.C, soln, ckt.q, 1.0);
// -rhs = c - dqdt
for (var i = ckt.N-1; i >= 0; --i) {
var dqdt = ckt.alpha0*ckt.q[i] + ckt.alpha1*ckt.oldq[i] +
ckt.alpha2*ckt.old2q[i];
//alert(numeric.prettyPrint(dqdt));
rhs[i] = ckt.beta0[i]*ckt.c[i] + ckt.beta1[i]*ckt.oldc[i] - dqdt;
}
// matrix = beta0*G + alpha0*C.
ckt.mat_scale_add(ckt.G,ckt.C,ckt.beta0,ckt.alpha0,ckt.matrix);
}
var p = new Array(3);
function interp_coeffs(t, t0, t1, t2) {
// Poly coefficients
var dtt0 = (t - t0);
var dtt1 = (t - t1);
var dtt2 = (t - t2);
var dt0dt1 = (t0 - t1);
var dt0dt2 = (t0 - t2);
var dt1dt2 = (t1 - t2);
p[0] = (dtt1*dtt2)/(dt0dt1 * dt0dt2);
p[1] = (dtt0*dtt2)/(-dt0dt1 * dt1dt2);
p[2] = (dtt0*dtt1)/(dt0dt2 * dt1dt2);
return p;
}
function pick_step(ckt, step_index) {
var min_shrink_factor = 1.0/lte_step_decrease_factor;
var max_growth_factor = time_step_increase_factor;
var N = ckt.N;
var p = interp_coeffs(ckt.time, ckt.oldt, ckt.old2t, ckt.old3t);
var trapcoeff = 0.5*(ckt.time - ckt.oldt)/(ckt.time - ckt.old3t);
var maxlteratio = 0.0;
for (var i = ckt.N-1; i >= 0; --i) {
if (ckt.ltecheck[i]) { // Check lte on variable
var pred = p[0]*ckt.oldsol[i] + p[1]*ckt.old2sol[i] + p[2]*ckt.old3sol[i];
var lte = Math.abs((ckt.solution[i] - pred))*trapcoeff;
var lteratio = lte/(lterel*(ckt.abstol[i] + reltol*ckt.soln_max[i]));
maxlteratio = Math.max(maxlteratio, lteratio);
}
}
var new_step;
var lte_step_ratio = 1.0/Math.pow(maxlteratio,1/3); // Cube root because trap
if (lte_step_ratio < 1.0) { // Shrink the timestep to make lte
lte_step_ratio = Math.max(lte_step_ratio,min_shrink_factor);
new_step = (ckt.time - ckt.oldt)*0.75*lte_step_ratio;
new_step = Math.max(new_step, ckt.min_step);
} else {
lte_step_ratio = Math.min(lte_step_ratio, max_growth_factor);
if (lte_step_ratio > 1.2) /* Increase timestep due to lte. */
new_step = (ckt.time - ckt.oldt) * lte_step_ratio / 1.2;
else
new_step = (ckt.time - ckt.oldt);
new_step = Math.min(new_step, ckt.max_step);
}
return new_step;
}
// Standard to do a dc analysis before transient
// Otherwise, do the setup also done in dc.
no_dc = true;
if ((this.diddc == false) && (no_dc == false)) this.dc();
else {
// Allocate matrices and vectors.
this.finalize();
// Load up the linear elements once and for all
for (var i = this.devices.length - 1; i >= 0; --i)
this.devices[i].load_linear(this)
}
// Tired of typing this, and using "with" generates hate mail.
var N = this.N;
// build array to hold list of results for each variable
// last entry is for timepoints.
var response = new Array(N + 1);
for (var i = N; i >= 0; --i) response[i] = new Array();
// Allocate back vectors for up to a second order method
this.old3sol = new Array(this.N);
this.old3q = new Array(this.N);
this.old2sol = new Array(this.N);
this.old2q = new Array(this.N);
this.oldsol = new Array(this.N);
this.oldq = new Array(this.N);
this.q = new Array(this.N);
this.oldc = new Array(this.N);
this.c = new Array(this.N);
this.alpha0 = 1.0;
this.alpha1 = 0.0;
this.alpha2 = 0.0;
this.beta0 = new Array(this.N);
this.beta1 = new Array(this.N);
// Mark the algebraic rows (useful for trap)
this.ar = this.zero_row(this.C);
// Non-algebraic variables and probe variables get lte
this.ltecheck = new Array(this.N);
for (var i = N; i >= 0; --i)
this.ltecheck[i] = (this.ar[i] == 0);
for (var name in this.node_map) {
var index = this.node_map[name];
for (var i = probenames.length; i >= 0; --i) {
if (name == probenames[i]) {
this.ltecheck[index] = true;
break;
}
}
}
this.time = tstart;
this.max_step = (tstop - tstart)/ntpts;
this.min_step = this.max_step/1e8;
var new_step = this.max_step/1e6;
this.oldt = this.time - new_step;
// Initialize old crnts, charges, and solutions.
load_tran(this,this.solution,this.rhs)
for (var i = N-1; i >= 0; --i) {
this.old3sol[i] = this.solution[i];
this.old2sol[i] = this.solution[i];
this.oldsol[i] = this.solution[i];
this.old3q[i] = this.q[i];
this.old2q[i] = this.q[i];
this.oldq[i] = this.q[i];
this.oldc[i] = this.c[i];
}
var beta0,beta1;
// Start with two pseudo-Euler steps, maximum 50000 steps
for(var step_index = -3; step_index < 50000; step_index++) {
// Save the just computed solution, and move back q and c.
for (var i = this.N - 1; i >= 0; --i) {
if (step_index >= 0)
response[i].push(this.solution[i]);
this.oldc[i] = this.c[i];
this.old3sol[i] = this.old2sol[i];
this.old2sol[i] = this.oldsol[i];
this.oldsol[i] = this.solution[i];
this.old3q[i] = this.oldq[i];
this.old2q[i] = this.oldq[i];
this.oldq[i] = this.q[i];
}
if (step_index < 0) { // Take a prestep using BE
this.old3t = this.old2t - (this.oldt-this.old2t)
this.old2t = this.oldt - (tstart-this.oldt)
this.oldt = tstart - (this.time - this.oldt);
this.time = tstart;
beta0 = 1.0;
beta1 = 0.0;
} else { // Take a regular step
// Save the time, and rotate time wheel
response[this.N].push(this.time);
this.old3t = this.old2t;
this.old2t = this.oldt;
this.oldt = this.time;
// Make sure we come smoothly in to the interval end.
if (this.time >= tstop) break; // We're done.
else if(this.time + new_step > tstop)
this.time = tstop;
else if(this.time + 1.5*new_step > tstop)
this.time += (2/3)*(tstop - this.time);
else
this.time += new_step;
// Trapezoidal rule betas
beta0 = 0.5;
beta1 = 0.5;
}
// For trap rule, turn off current avging for algebraic eqns
for (var i = this.N - 1; i >= 0; --i) {
this.beta0[i] = beta0 + this.ar[i]*beta1;
this.beta1[i] = (1.0 - this.ar[i])*beta1;
}
// Loop to find NR converging timestep with okay LTE
while (true) {
// Set the timestep coefficients (alpha2 is for bdf2).
this.alpha0 = 1.0/(this.time - this.oldt);
this.alpha1 = -this.alpha0;
this.alpha2 = 0;
// Use Newton to compute the solution.
var iterations = this.find_solution(load_tran,max_tran_iters);
// If NR succeeds and stepsize is at min, accept and newstep=maxgrowth*minstep.
// Else if Newton Fails, shrink step by a factor and try again
// Else LTE picks new step, if bigger accept current step and go on.
if ((iterations != undefined) &&
(step_index <= 0 || (this.time-this.oldt) < (1+reltol)*this.min_step)) {
if (step_index > 0) new_step = time_step_increase_factor*this.min_step;
break;
} else if (iterations == undefined) { // NR nonconvergence, shrink by factor
//alert('timestep nonconvergence');
this.time = this.oldt +
(this.time - this.oldt)/nr_step_decrease_factor;
} else { // Check the LTE and shrink step if needed.
new_step = pick_step(this, step_index);
if (new_step < (1.0 - reltol)*(this.time - this.oldt)) {
this.time = this.oldt + new_step; // Try again
}
else
break; // LTE okay, new_step for next step
}
}
}
// create solution dictionary
var result = new Array();
for (var name in this.node_map) {
var index = this.node_map[name];
result[name] = (index == -1) ? 0 : response[index];
}
// capture branch currents from voltage sources
for (var i = this.voltage_sources.length - 1; i >= 0; --i) {
var v = this.voltage_sources[i];
result['I('+v.name+')'] = response[v.branch];
}
result['_time_'] = response[this.N];
return result;
}
// AC analysis: npts/decade for freqs in range [fstart,fstop]
// result['_frequencies_'] = vector of log10(sample freqs)
// result['xxx'] = vector of dB(response for node xxx)
// NOTE: Normalization removed in schematic.js, jkw.
Circuit.prototype.ac = function(npts,fstart,fstop,source_name) {
if (this.diddc == false) this.dc();
var N = this.N;
var G = this.G;
var C = this.C;
// Complex numbers, we're going to need a bigger boat
var matrixac = this.make_mat(2*N, (2*N)+1);
// Get the source used for ac
if (this.device_map[source_name] === undefined) {
alert('AC analysis refers to unknown source ' + source_name);
return 'AC analysis failed, unknown source';
}
this.device_map[source_name].load_ac(this,this.rhs);
// build array to hold list of results for each node
// last entry is for frequency values
var response = new Array(N + 1);
for (var i = N; i >= 0; --i) response[i] = new Array();
// multiplicative frequency increase between freq points
var delta_f = Math.exp(Math.LN10/npts);
var f = fstart;
fstop *= 1.0001; // capture that last time point!
while (f <= fstop) {
var omega = 2 * Math.PI * f;
response[this.N].push(f);
// Find complex x+jy that sats Gx-omega*Cy=rhs; omega*Cx+Gy=0
// Note: solac[0:N-1]=x, solac[N:2N-1]=y
for (var i = N-1; i >= 0; --i) {
// First the rhs, replicated for real and imaginary
matrixac[i][2*N] = this.rhs[i];
matrixac[i+N][2*N] = 0;
for (var j = N-1; j >= 0; --j) {
matrixac[i][j] = G[i][j];
matrixac[i+N][j+N] = G[i][j];
matrixac[i][j+N] = -omega*C[i][j];
matrixac[i+N][j] = omega*C[i][j];
}
}
// Compute the small signal response
var solac = solve_linear_system(matrixac);
// Save just the magnitude for now
for (var i = this.N - 1; i >= 0; --i) {
var mag = Math.sqrt(solac[i]*solac[i] + solac[i+N]*solac[i+N]);
response[i].push(mag);
}
f *= delta_f; // increment frequency
}
// create solution dictionary
var result = new Array();
for (var name in this.node_map) {
var index = this.node_map[name];
result[name] = (index == -1) ? 0 : response[index];
}
result['_frequencies_'] = response[this.N];
return result;
}
// Helper for adding devices to a circuit, warns on duplicate device names.
Circuit.prototype.add_device = function(d,name) {
// Add device to list of devices and to device map
this.devices.push(d);
d.name = name;
if (name) {
if (this.device_map[name] === undefined)
this.device_map[name] = d;
else {
alert('Warning: two circuit elements share the same name ' + name);
this.device_map[name] = d;
}
}
return d;
}
Circuit.prototype.r = function(n1,n2,v,name) {
// try to convert string value into numeric value, barf if we can't
if ((typeof v) == 'string') {
v = parse_number(v,undefined);
if (v === undefined) return undefined;
}
if (v != 0) {
var d = new Resistor(n1,n2,v);
return this.add_device(d, name);
} else return this.v(n1,n2,0,name); // zero resistance == 0V voltage source
}
Circuit.prototype.d = function(n1,n2,area,name) {
// try to convert string value into numeric value, barf if we can't
if ((typeof area) == 'string') {
area = parse_number(area,undefined);
if (area === undefined) return undefined;
}
if (area != 0) {
var d = new Diode(n1,n2,area);
return this.add_device(d, name);
} // zero area diodes discarded.
}
Circuit.prototype.c = function(n1,n2,v,name) {
// try to convert string value into numeric value, barf if we can't
if ((typeof v) == 'string') {
v = parse_number(v,undefined);
if (v === undefined) return undefined;
}
var d = new Capacitor(n1,n2,v);
return this.add_device(d, name);
}
Circuit.prototype.l = function(n1,n2,v,name) {
// try to convert string value into numeric value, barf if we can't
if ((typeof v) == 'string') {
v = parse_number(v,undefined);
if (v === undefined) return undefined;
}
var branch = this.node(undefined,T_CURRENT);
var d = new Inductor(n1,n2,branch,v);
return this.add_device(d, name);
}
Circuit.prototype.v = function(n1,n2,v,name) {
var branch = this.node(undefined,T_CURRENT);
var d = new VSource(n1,n2,branch,v);
this.voltage_sources.push(d);
return this.add_device(d, name);
}
Circuit.prototype.i = function(n1,n2,v,name) {
var d = new ISource(n1,n2,v);
return this.add_device(d, name);
}
Circuit.prototype.opamp = function(np,nn,no,ng,A,name) {
// try to convert string value into numeric value, barf if we can't
if ((typeof A) == 'string') {
ratio = parse_number(A,undefined);
if (A === undefined) return undefined;
}
var branch = this.node(undefined,T_CURRENT);
var d = new Opamp(np,nn,no,ng,branch,A,name);
return this.add_device(d, name);
}
Circuit.prototype.n = function(d,g,s, ratio, name) {
// try to convert string value into numeric value, barf if we can't
if ((typeof ratio) == 'string') {
ratio = parse_number(ratio,undefined);
if (ratio === undefined) return undefined;
}
var d = new Fet(d,g,s,ratio,name,'n');
return this.add_device(d, name);
}
Circuit.prototype.p = function(d,g,s, ratio, name) {
// try to convert string value into numeric value, barf if we can't
if ((typeof ratio) == 'string') {
ratio = parse_number(ratio,undefined);
if (ratio === undefined) return undefined;
}
var d = new Fet(d,g,s,ratio,name,'p');
return this.add_device(d, name);
}
///////////////////////////////////////////////////////////////////////////////
//
// Support for creating and solving a system of linear equations
//
////////////////////////////////////////////////////////////////////////////////
// model circuit using a linear system of the form Ax = b where
// A is an nxn matrix of conductances and branch voltages
// b is an n-element vector of sources
// x is an n-element vector of unknowns (node voltages, branch currents)
// Knowns (A and b) are stored in an augmented matrix M = [A | b]
// Matrix is stored as an array of arrays: M[row][col].
// Allocate an NxM matrix
Circuit.prototype.make_mat = function(N,M) {
var mat = new Array(N);
for (var i = N - 1; i >= 0; --i) {
mat[i] = new Array(M);
for (var j = M - 1; j >= 0; --j) {
mat[i][j] = 0.0;
}
}
return mat;
}
// Form b = scale*Mx
Circuit.prototype.matv_mult = function(M,x,b,scale) {
var n = M.length;
var m = M[0].length;
if (n != b.length || m != x.length)
throw 'Rows of M mismatched to b or cols mismatch to x.';
for (var i = 0; i < n; i++) {
var temp = 0;
for (var j = 0; j < m; j++) temp += M[i][j]*x[j];
b[i] = scale*temp; // Recall the neg in the name
}
}
// C = scalea*A + scaleb*B, scalea, scaleb eithers numbers or arrays (row scaling)
Circuit.prototype.mat_scale_add = function(A, B, scalea, scaleb, C) {
var n = A.length;
var m = A[0].length;
if (n > B.length || m > B[0].length)
throw 'Row or columns of A to large for B';
if (n > C.length || m > C[0].length)
throw 'Row or columns of A to large for C';
if ((typeof scalea == 'number') && (typeof scaleb == 'number'))
for (var i = 0; i < n; i++)
for (var j = 0; j < m; j++)
C[i][j] = scalea*A[i][j] + scaleb*B[i][j];
else if ((typeof scaleb == 'number') && (scalea instanceof Array))
for (var i = 0; i < n; i++)
for (var j = 0; j < m; j++)
C[i][j] = scalea[i]*A[i][j] + scaleb*B[i][j];
else if ((typeof scaleb instanceof Array) && (scalea instanceof Array))
for (var i = 0; i < n; i++)
for (var j = 0; j < m; j++)
C[i][j] = scalea[i]*A[i][j] + scaleb[i]*B[i][j];
else
throw 'scalea and scaleb must be scalars or Arrays';
}
// Returns a vector of ones and zeros, ones denote zero rows in M
Circuit.prototype.zero_row = function(M) {
var N = M.length
var one_if_zero = new Array(N);
for (var i = N-1; i >= 0; i--)
if ((Math.max.apply(Math, M[i]) == 0)
&& (Math.min.apply(Math, M[i]) == 0))
one_if_zero[i] = 1.0;
else one_if_zero[i] = 0.0;
return one_if_zero;
}
// Copy A -> using the bounds of A
Circuit.prototype.copy_mat = function(src,dest) {
var n = src.length;
var m = src[0].length;
if (n > dest.length || m > dest[0].length)
throw 'Rows or cols > rows or cols of dest';
for (var i = 0; i < n; i++)
for (var j = 0; j < m; j++)
dest[i][j] = src[i][j];
}
// add val component between two nodes to matrix M
// Index of -1 refers to ground node
Circuit.prototype.add_two_terminal = function(i,j,g,M) {
if (i >= 0) {
M[i][i] += g;
if (j >= 0) {
M[i][j] -= g;
M[j][i] -= g;
M[j][j] += g;
}
} else if (j >= 0)
M[j][j] += g;
}
// add val component between two nodes to matrix M
// Index of -1 refers to ground node
Circuit.prototype.get_two_terminal = function(i,j,x) {
var xi_minus_xj = 0;
if (i >= 0) xi_minus_xj = x[i];
if (j >= 0) xi_minus_xj -= x[j];
return xi_minus_xj
}
Circuit.prototype.add_conductance_l = function(i,j,g) {
this.add_two_terminal(i,j,g, this.Gl)
}
Circuit.prototype.add_conductance = function(i,j,g) {
this.add_two_terminal(i,j,g, this.G)
}
Circuit.prototype.add_capacitance = function(i,j,c) {
this.add_two_terminal(i,j,c,this.C)
}
// add individual conductance to Gl matrix
Circuit.prototype.add_to_Gl = function(i,j,g) {
if (i >=0 && j >= 0)
this.Gl[i][j] += g;
}
// add individual conductance to Gl matrix
Circuit.prototype.add_to_G = function(i,j,g) {
if (i >=0 && j >= 0)
this.G[i][j] += g;
}
// add individual capacitance to C matrix
Circuit.prototype.add_to_C = function(i,j,c) {
if (i >=0 && j >= 0)
this.C[i][j] += c;
}
// add source info to rhs
Circuit.prototype.add_to_rhs = function(i,v,rhs) {
if (i >= 0) rhs[i] += v;
}
// solve Ax=b and return vector x given augmented matrix M = [A | b]
// Uses Gaussian elimination with partial pivoting
function solve_linear_system(M,rhs) {
var N = M.length; // augmented matrix M has N rows, N+1 columns
var temp,i,j;
// Copy the rhs in to the last column of M if one is given.
if (rhs != null) {
for (var row = 0; row < N ; row++)
M[row][N] = rhs[row];
}
// gaussian elimination
for (var col = 0; col < N ; col++) {
// find pivot: largest abs(v) in this column of remaining rows
var max_v = Math.abs(M[col][col]);
var max_col = col;
for (i = col + 1; i < N; i++) {
temp = Math.abs(M[i][col]);
if (temp > max_v) { max_v = temp; max_col = i; }
}
// if no value found, generate a small conductance to gnd
// otherwise swap current row with pivot row
if (max_v == 0) M[col][col] = 1e-10;
else {
temp = M[col];
M[col] = M[max_col];
M[max_col] = temp;
}
// now eliminate this column for all subsequent rows
for (i = col + 1; i < N; i++) {
temp = M[i][col]/M[col][col]; // multiplier we'll use for current row
if (temp != 0)
// subtract current row from row we're working on
// remember to process b too!
for (j = col; j <= N; j++) M[i][j] -= M[col][j]*temp;
}
}
// matrix is now upper triangular, so solve for elements of x starting
// with the last row
var x = new Array(N);
for (i = N-1; i >= 0; --i) {
temp = M[i][N]; // grab b[i] from augmented matrix as RHS
// subtract LHS term from RHS using known x values
for (j = N-1; j > i; --j) temp -= M[i][j]*x[j];
// now compute new x value
x[i] = temp/M[i][i];
}
// return solution
return x;
}
// test solution code, expect x = [2,3,-1]
//M = [[2,1,-1,8],[-3,-1,2,-11],[-2,1,2,-3]];
//x = solve_linear_system(M);
//y = 1; // so we have place to set a breakpoint :)
///////////////////////////////////////////////////////////////////////////////
//
// Device base class
//
////////////////////////////////////////////////////////////////////////////////
function Device() {
}
// complete initial set up of device
Device.prototype.finalize = function() {
}
// Load the linear elements in to Gl and C
Device.prototype.load_linear = function(ckt) {
}
// load linear system equations for dc analysis
// (inductors shorted and capacitors opened)
Device.prototype.load_dc = function(ckt,soln,rhs) {
}
// load linear system equations for tran analysis
Device.prototype.load_tran = function(ckt,soln) {
}
// load linear system equations for ac analysis:
// current sources open, voltage sources shorted
// linear models at operating point for everyone else
Device.prototype.load_ac = function(ckt,rhs) {
}
// return time of next breakpoint for the device
Device.prototype.breakpoint = function(time) {
return undefined;
}
///////////////////////////////////////////////////////////////////////////////
//
// Parse numbers in engineering notation
//
///////////////////////////////////////////////////////////////////////////////
// convert first character of argument into an integer
function ord(ch) {
return ch.charCodeAt(0);
}
// convert string argument to a number, accepting usual notations
// (hex, octal, binary, decimal, floating point) plus engineering
// scale factors (eg, 1k = 1000.0 = 1e3).
// return default if argument couldn't be interpreted as a number
function parse_number(s,default_v) {
var slen = s.length;
var multiplier = 1;
var result = 0;
var index = 0;
// skip leading whitespace
while (index < slen && s.charAt(index) <= ' ') index += 1;
if (index == slen) return default_v;
// check for leading sign
if (s.charAt(index) == '-') {
multiplier = -1;
index += 1;
} else if (s.charAt(index) == '+')
index += 1;
var start = index; // remember where digits start
// if leading digit is 0, check for hex, octal or binary notation
if (index >= slen) return default_v;
else if (s.charAt(index) == '0') {
index += 1;
if (index >= slen) return 0;
if (s.charAt(index) == 'x' || s.charAt(index) == 'X') { // hex
while (true) {
index += 1;
if (index >= slen) break;
if (s.charAt(index) >= '0' && s.charAt(index) <= '9')
result = result*16 + ord(s.charAt(index)) - ord('0');
else if (s.charAt(index) >= 'A' && s.charAt(index) <= 'F')
result = result*16 + ord(s.charAt(index)) - ord('A') + 10;
else if (s.charAt(index) >= 'a' && s.charAt(index) <= 'f')
result = result*16 + ord(s.charAt(index)) - ord('a') + 10;
else break;
}
return result*multiplier;
} else if (s.charAt(index) == 'b' || s.charAt(index) == 'B') { // binary
while (true) {
index += 1;
if (index >= slen) break;
if (s.charAt(index) >= '0' && s.charAt(index) <= '1')
result = result*2 + ord(s.charAt(index)) - ord('0');
else break;
}
return result*multiplier;
} else if (s.charAt(index) != '.') { // octal
while (true) {
if (s.charAt(index) >= '0' && s.charAt(index) <= '7')
result = result*8 + ord(s.charAt(index)) - ord('0');
else break;
index += 1;
if (index >= slen) break;
}
return result*multiplier;
}
}
// read decimal integer or floating-point number
while (true) {
if (s.charAt(index) >= '0' && s.charAt(index) <= '9')
result = result*10 + ord(s.charAt(index)) - ord('0');
else break;
index += 1;
if (index >= slen) break;
}
// fractional part?
if (index < slen && s.charAt(index) == '.') {
while (true) {
index += 1;
if (index >= slen) break;
if (s.charAt(index) >= '0' && s.charAt(index) <= '9') {
result = result*10 + ord(s.charAt(index)) - ord('0');
multiplier *= 0.1;
} else break;
}
}
// if we haven't seen any digits yet, don't check
// for exponents or scale factors
if (index == start) return default_v;
// type of multiplier determines type of result:
// multiplier is a float if we've seen digits past
// a decimal point, otherwise it's an int or long.
// Up to this point result is an int or long.
result *= multiplier;
// now check for exponent or engineering scale factor. If there
// is one, result will be a float.
if (index < slen) {
var scale = s.charAt(index);
index += 1;
if (scale == 'e' || scale == 'E') {
var exponent = 0;
multiplier = 10.0;
if (index < slen) {
if (s.charAt(index) == '+') index += 1;
else if (s.charAt(index) == '-') {
index += 1;
multiplier = 0.1;
}
}
while (index < slen) {
if (s.charAt(index) >= '0' && s.charAt(index) <= '9') {
exponent = exponent*10 + ord(s.charAt(index)) - ord('0');
index += 1;
} else break;
}
while (exponent > 0) {
exponent -= 1;
result *= multiplier;
}
} else if (scale == 't' || scale == 'T') result *= 1e12;
else if (scale == 'g' || scale == 'G') result *= 1e9;
else if (scale == 'M') result *= 1e6;
else if (scale == 'k' || scale == 'K') result *= 1e3;
else if (scale == 'm') result *= 1e-3;
else if (scale == 'u' || scale == 'U') result *= 1e-6;
else if (scale == 'n' || scale == 'N') result *= 1e-9;
else if (scale == 'p' || scale == 'P') result *= 1e-12;
else if (scale == 'f' || scale == 'F') result *= 1e-15;
}
// ignore any remaining chars, eg, 1kohms returns 1000
return result;
}
Circuit.prototype.parse_number = parse_number; // make it easy to call from outside
///////////////////////////////////////////////////////////////////////////////
//
// Sources
//
///////////////////////////////////////////////////////////////////////////////
// argument is a string describing the source's value (see comments for details)
// source types: dc,step,square,triangle,sin,pulse,pwl,pwl_repeating
// returns an object with the following attributes:
// fun -- name of source function
// args -- list of argument values
// value(t) -- compute source value at time t
// inflection_point(t) -- compute time after t when a time point is needed
// dc -- value at time 0
function parse_source(v) {
// generic parser: parse v as either <value> or <fun>(<value>,...)
var src = new Object();
src.value = function(t) { return 0; } // overridden below
src.inflection_point = function(t) { return undefined; }; // may be overridden below
// see if there's a "(" in the description
var index = v.indexOf('(');
var ch;
if (index >= 0) {
src.fun = v.slice(0,index); // function name is before the "("
src.args = []; // we'll push argument values onto this list
var end = v.indexOf(')',index);
if (end == -1) end = v.length;
index += 1; // start parsing right after "("
while (index < end) {
// figure out where next argument value starts
ch = v.charAt(index);
if (ch <= ' ') { index++; continue; }
// and where it ends
var arg_end = v.indexOf(',',index);
if (arg_end == -1) arg_end = end;
// parse and save result in our list of arg values
src.args.push(parse_number(v.slice(index,arg_end),undefined));
index = arg_end + 1;
}
} else {
src.fun = 'dc';
src.args = [parse_number(v,0)];
}
// post-processing for constant sources
// dc(v)
if (src.fun == 'dc') {
var v = arg_value(src.args,0,0);
src.args = [v];
src.value = function(t) { return v; } // closure
}
// post-processing for impulse sources
// impulse(height,width)
else if (src.fun == 'impulse') {
var h = arg_value(src.args,0,1); // default height: 1
var w = Math.abs(arg_value(src.args,2,1e-9)); // default width: 1ns
src.args = [h,w]; // remember any defaulted values
pwl_source(src,[0,0,w/2,h,w,0],false);
}
// post-processing for step sources
// step(v_init,v_plateau,t_delay,t_rise)
else if (src.fun == 'step') {
var v1 = arg_value(src.args,0,0); // default init value: 0V
var v2 = arg_value(src.args,1,1); // default plateau value: 1V
var td = Math.max(0,arg_value(src.args,2,0)); // time step starts
var tr = Math.abs(arg_value(src.args,3,1e-9)); // default rise time: 1ns
src.args = [v1,v2,td,tr]; // remember any defaulted values
pwl_source(src,[td,v1,td+tr,v2],false);
}
// post-processing for square wave
// square(v_init,v_plateau,freq)
else if (src.fun == 'square') {
var v1 = arg_value(src.args,0,0); // default init value: 0V
var v2 = arg_value(src.args,1,1); // default plateau value: 1V
var freq = Math.abs(arg_value(src.args,2,1)); // default frequency: 1Hz
src.args = [v1,v2,freq]; // remember any defaulted values
var per = freq == 0 ? Infinity : 1/freq;
var t_change = 0.01 * per; // rise and fall time
var t_pw = 0.49 * per; // half the cycle minus rise and fall time
pwl_source(src,[0,v1,t_change,v2,t_change+t_pw,
v2,t_change+t_pw+t_change,v1,per,v1],true);
}
// post-processing for triangle
// triangle(v_init,v_plateua,t_period)
else if (src.fun == 'triangle') {
var v1 = arg_value(src.args,0,0); // default init value: 0V
var v2 = arg_value(src.args,1,1); // default plateau value: 1V
var freq = Math.abs(arg_value(src.args,2,1)); // default frequency: 1s
src.args = [v1,v2,freq]; // remember any defaulted values
var per = freq == 0 ? Infinity : 1/freq;
pwl_source(src,[0,v1,per/2,v2,per,v1],true);
}
// post-processing for pwl and pwlr sources
// pwl[r](t1,v1,t2,v2,...)
else if (src.fun == 'pwl' || src.fun == 'pwl_repeating') {
pwl_source(src,src.args,src.fun == 'pwl_repeating');
}
// post-processing for pulsed sources
// pulse(v_init,v_plateau,t_delay,t_rise,t_fall,t_width,t_period)
else if (src.fun == 'pulse') {
var v1 = arg_value(src.args,0,0); // default init value: 0V
var v2 = arg_value(src.args,1,1); // default plateau value: 1V
var td = Math.max(0,arg_value(src.args,2,0)); // time pulse starts
var tr = Math.abs(arg_value(src.args,3,1e-9)); // default rise time: 1ns
var tf = Math.abs(arg_value(src.args,4,1e-9)); // default rise time: 1ns
var pw = Math.abs(arg_value(src.args,5,1e9)); // default pulse width: "infinite"
var per = Math.abs(arg_value(src.args,6,1e9)); // default period: "infinite"
src.args = [v1,v2,td,tr,tf,pw,per];
var t1 = td; // time when v1 -> v2 transition starts
var t2 = t1 + tr; // time when v1 -> v2 transition ends
var t3 = t2 + pw; // time when v2 -> v1 transition starts
var t4 = t3 + tf; // time when v2 -> v1 transition ends
pwl_source(src,[t1,v1, t2,v2, t3,v2, t4,v1, per,v1],true);
}
// post-processing for sinusoidal sources
// sin(v_offset,v_amplitude,freq_hz,t_delay,phase_offset_degrees)
else if (src.fun == 'sin') {
var voffset = arg_value(src.args,0,0); // default offset voltage: 0V
var va = arg_value(src.args,1,1); // default amplitude: -1V to 1V
var freq = Math.abs(arg_value(src.args,2,1)); // default frequency: 1Hz
var td = Math.max(0,arg_value(src.args,3,0)); // default time delay: 0sec
var phase = arg_value(src.args,4,0); // default phase offset: 0 degrees
src.args = [voffset,va,freq,td,phase];
phase /= 360.0;
// return value of source at time t
src.value = function(t) { // closure
if (t < td) return voffset + va*Math.sin(2*Math.PI*phase);
else return voffset + va*Math.sin(2*Math.PI*(freq*(t - td) + phase));
}
// return time of next inflection point after time t
src.inflection_point = function(t) { // closure
if (t < td) return td;
else return undefined;
}
}
// object has all the necessary info to compute the source value and inflection points
src.dc = src.value(0); // DC value is value at time 0
return src;
}
function pwl_source(src,tv_pairs,repeat) {
var nvals = tv_pairs.length;
if (nvals % 2 == 1) npts -= 1; // make sure it's even!
if (nvals <= 2) {
// handle degenerate case
src.value = function(t) { return nvals == 2 ? tv_pairs[1] : 0; }
src.inflection_point = function(t) { return undefined; }
} else {
src.value = function(t) { // closure
if (repeat)
// make time periodic if values are to be repeated
t = Math.fmod(t,tv_pairs[nvals-2]);
var last_t = tv_pairs[0];
var last_v = tv_pairs[1];
if (t > last_t) {
var next_t,next_v;
for (var i = 2; i < nvals; i += 2) {
next_t = tv_pairs[i];
next_v = tv_pairs[i+1];
if (next_t > last_t) // defend against bogus tv pairs
if (t < next_t)
return last_v + (next_v - last_v)*(t - last_t)/(next_t - last_t);
last_t = next_t;
last_v = next_v;
}
}
return last_v;
}
src.inflection_point = function(t) { // closure
if (repeat)
// make time periodic if values are to be repeated
t = Math.fmod(t,tv_pairs[nvals-2]);
for (var i = 0; i < nvals; i += 2) {
var next_t = tv_pairs[i];
if (t < next_t) return next_t;
}
return undefined;
}
}
}
// helper function: return args[index] if present, else default_v
function arg_value(args,index,default_v) {
if (index < args.length) {
var result = args[index];
if (result === undefined) result = default_v;
return result;
} else return default_v;
}
// we need fmod in the Math library!
Math.fmod = function(numerator,denominator) {
var quotient = Math.floor(numerator/denominator);
return numerator - quotient*denominator;
}
///////////////////////////////////////////////////////////////////////////////
//
// Sources
//
///////////////////////////////////////////////////////////////////////////////
function VSource(npos,nneg,branch,v) {
Device.call(this);
this.src = parse_source(v);
this.npos = npos;
this.nneg = nneg;
this.branch = branch;
}
VSource.prototype = new Device();
VSource.prototype.constructor = VSource;
// load linear part for source evaluation
VSource.prototype.load_linear = function(ckt) {
// MNA stamp for independent voltage source
ckt.add_to_Gl(this.branch,this.npos,1.0);
ckt.add_to_Gl(this.branch,this.nneg,-1.0);
ckt.add_to_Gl(this.npos,this.branch,1.0);
ckt.add_to_Gl(this.nneg,this.branch,-1.0);
}
// Source voltage added to b.
VSource.prototype.load_dc = function(ckt,soln,rhs) {
ckt.add_to_rhs(this.branch,this.src.dc,rhs);
}
// Load time-dependent value for voltage source for tran
VSource.prototype.load_tran = function(ckt,soln,rhs,time) {
ckt.add_to_rhs(this.branch,this.src.value(time),rhs);
}
// return time of next breakpoint for the device
VSource.prototype.breakpoint = function(time) {
return this.src.inflection_point(time);
}
// small signal model ac value
VSource.prototype.load_ac = function(ckt,rhs) {
ckt.add_to_rhs(this.branch,1.0,rhs);
}
function ISource(npos,nneg,v) {
Device.call(this);
this.src = parse_source(v);
this.npos = npos;
this.nneg = nneg;
}
ISource.prototype = new Device();
ISource.prototype.constructor = ISource;
// load linear system equations for dc analysis
ISource.prototype.load_dc = function(ckt,soln,rhs) {
var is = this.src.dc;
// MNA stamp for independent current source
ckt.add_to_rhs(this.npos,-is,rhs); // current flow into npos
ckt.add_to_rhs(this.nneg,is,rhs); // and out of nneg
}
// load linear system equations for tran analysis (just like DC)
ISource.prototype.load_tran = function(ckt,soln,rhs,time) {
var is = this.src.value(time);
// MNA stamp for independent current source
ckt.add_to_rhs(this.npos,-is,rhs); // current flow into npos
ckt.add_to_rhs(this.nneg,is,rhs); // and out of nneg
}
// return time of next breakpoint for the device
ISource.prototype.breakpoint = function(time) {
return this.src.inflection_point(time);
}
// small signal model: open circuit
ISource.prototype.load_ac = function(ckt) {
// MNA stamp for independent current source
ckt.add_to_rhs(this.npos,-1.0,rhs); // current flow into npos
ckt.add_to_rhs(this.nneg,1.0,rhs); // and out of nneg
}
///////////////////////////////////////////////////////////////////////////////
//
// Resistor
//
///////////////////////////////////////////////////////////////////////////////
function Resistor(n1,n2,v) {
Device.call(this);
this.n1 = n1;
this.n2 = n2;
this.g = 1.0/v;
}
Resistor.prototype = new Device();
Resistor.prototype.constructor = Resistor;
Resistor.prototype.load_linear = function(ckt) {
// MNA stamp for admittance g
ckt.add_conductance_l(this.n1,this.n2,this.g);
}
Resistor.prototype.load_dc = function(ckt) {
// Nothing to see here, move along.
}
Resistor.prototype.load_tran = function(ckt,soln) {
}
Resistor.prototype.load_ac = function(ckt) {
}
///////////////////////////////////////////////////////////////////////////////
//
// Diode
//
///////////////////////////////////////////////////////////////////////////////
function Diode(n1,n2,v) {
Device.call(this);
this.anode = n1;
this.cathode = n2;
this.area = v;
this.is = 1.0e-14;
this.ais = this.area * this.is;
this.vt = 2.58e-2; // 26 millivolts
}
Diode.prototype = new Device();
Diode.prototype.constructor = Diode;
Diode.prototype.load_linear = function(ckt) {
// Diode is not linear, has no linear piece.
}
Diode.prototype.load_dc = function(ckt,soln,rhs) {
var vd = ckt.get_two_terminal(this.anode, this.cathode, soln);
var temp1 = this.ais * Math.exp(vd / this.vt);
var id = temp1 - this.ais;
var gd = temp1 / this.vt
// MNA stamp for independent current source
ckt.add_to_rhs(this.anode,-id,rhs); // current flows into anode
ckt.add_to_rhs(this.cathode,id,rhs); // and out of cathode
ckt.add_conductance(this.anode,this.cathode,gd);
}
Diode.prototype.load_tran = function(ckt,soln,rhs,time) {
this.load_dc(ckt,soln,rhs);
}
Diode.prototype.load_ac = function(ckt) {
}
///////////////////////////////////////////////////////////////////////////////
//
// Capacitor
//
///////////////////////////////////////////////////////////////////////////////
function Capacitor(n1,n2,v) {
Device.call(this);
this.n1 = n1;
this.n2 = n2;
this.value = v;
}
Capacitor.prototype = new Device();
Capacitor.prototype.constructor = Capacitor;
Capacitor.prototype.load_linear = function(ckt) {
// MNA stamp for capacitance matrix
ckt.add_capacitance(this.n1,this.n2,this.value);
}
Capacitor.prototype.load_dc = function(ckt,soln,rhs) {
}
Capacitor.prototype.load_ac = function(ckt) {
}
Capacitor.prototype.load_tran = function(ckt) {
}
///////////////////////////////////////////////////////////////////////////////
//
// Inductor
//
///////////////////////////////////////////////////////////////////////////////
function Inductor(n1,n2,branch,v) {
Device.call(this);
this.n1 = n1;
this.n2 = n2;
this.branch = branch;
this.value = v;
}
Inductor.prototype = new Device();
Inductor.prototype.constructor = Inductor;
Inductor.prototype.load_linear = function(ckt) {
// MNA stamp for inductor linear part
// L on diag of C because L di/dt = v(n1) - v(n2)
ckt.add_to_Gl(this.n1,this.branch,1);
ckt.add_to_Gl(this.n2,this.branch,-1);
ckt.add_to_Gl(this.branch,this.n1,-1);
ckt.add_to_Gl(this.branch,this.n2,1);
ckt.add_to_C(this.branch,this.branch,this.value)
}
Inductor.prototype.load_dc = function(ckt,soln,rhs) {
// Inductor is a short at dc, so is linear.
}
Inductor.prototype.load_ac = function(ckt) {
}
Inductor.prototype.load_tran = function(ckt) {
}
///////////////////////////////////////////////////////////////////////////////
//
// Simple Voltage-Controlled Voltage Source Op Amp model
//
///////////////////////////////////////////////////////////////////////////////
function Opamp(np,nn,no,ng,branch,A,name) {
Device.call(this);
this.np = np;
this.nn = nn;
this.no = no;
this.ng = ng;
this.branch = branch;
this.gain = A;
this.name = name;
}
Opamp.prototype = new Device();
Opamp.prototype.constructor = Opamp;
Opamp.prototype.load_linear = function(ckt) {
// MNA stamp for VCVS: 1/A(v(no) - v(ng)) - (v(np)-v(nn))) = 0.
var invA = 1.0/this.gain;
ckt.add_to_Gl(this.no,this.branch,1);
ckt.add_to_Gl(this.ng,this.branch,-1);
ckt.add_to_Gl(this.branch,this.no,invA);
ckt.add_to_Gl(this.branch,this.ng,-invA);
ckt.add_to_Gl(this.branch,this.np,-1);
ckt.add_to_Gl(this.branch,this.nn,1);
}
Opamp.prototype.load_dc = function(ckt,soln,rhs) {
// Op-amp is linear.
}
Opamp.prototype.load_ac = function(ckt) {
}
Opamp.prototype.load_tran = function(ckt) {
}
///////////////////////////////////////////////////////////////////////////////
//
// Simplified MOS FET with no bulk connection and no body effect.
//
///////////////////////////////////////////////////////////////////////////////
function Fet(d,g,s,ratio,name,type) {
Device.call(this);
this.d = d;
this.g = g;
this.s = s;
this.name = name;
this.ratio = ratio;
if (type != 'n' && type != 'p')
{ throw 'fet type is not n or p';
}
this.type_sign = (type == 'n') ? 1 : -1;
this.vt = 0.5;
this.kp = 20e-6;
this.beta = this.kp * this.ratio;
this.lambda = 0.05;
}
Fet.prototype = new Device();
Fet.prototype.constructor = Fet;
Fet.prototype.load_linear = function(ckt) {
// FET's are nonlinear, just like javascript progammers
}
Fet.prototype.load_dc = function(ckt,soln,rhs) {
var vds = this.type_sign * ckt.get_two_terminal(this.d, this.s, soln);
if (vds < 0) { // Drain and source have swapped roles
var temp = this.d;
this.d = this.s;
this.s = temp;
vds = this.type_sign * ckt.get_two_terminal(this.d, this.s, soln);
}
var vgs = this.type_sign * ckt.get_two_terminal(this.g, this.s, soln);
var vgst = vgs - this.vt;
with (this) {
var gmgs,ids,gds;
if (vgst > 0.0 ) { // vgst < 0, transistor off, no subthreshold here.
if (vgst < vds) { /* Saturation. */
gmgs = beta * (1 + (lambda * vds)) * vgst;
ids = type_sign * 0.5 * gmgs * vgst;
gds = 0.5 * beta * vgst * vgst * lambda;
} else { /* Linear region */
gmgs = beta * (1 + lambda * vds);
ids = type_sign * gmgs * vds * (vgst - 0.50 * vds);
gds = gmgs * (vgst - vds) + beta * lambda * vds * (vgst - 0.5 * vds);
gmgs *= vds;
}
ckt.add_to_rhs(d,-ids,rhs); // current flows into the drain
ckt.add_to_rhs(s, ids,rhs); // and out the source
ckt.add_conductance(d,s,gds);
ckt.add_to_G(s,s, gmgs);
ckt.add_to_G(d,s,-gmgs);
ckt.add_to_G(d,g, gmgs);
ckt.add_to_G(s,g,-gmgs);
}
}
}
Fet.prototype.load_tran = function(ckt,soln,rhs) {
this.load_dc(ckt,soln,rhs);
}
Fet.prototype.load_ac = function(ckt) {
}
///////////////////////////////////////////////////////////////////////////////
//
// Module definition
//
///////////////////////////////////////////////////////////////////////////////
var module = {
'Circuit': Circuit,
'parse_number': parse_number,
'parse_source': parse_source,
}
return module;
}());

1
js/cktsim.js Symbolic link
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../../data/js/cktsim.js

3535
js/schematic.js
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@@ -1,3535 +0,0 @@
/////////////////////////////////////////////////////////////////////////////
//
// Simple schematic capture
//
////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2011 Massachusetts Institute of Technology
// add schematics to a document with
//
// <input type="hidden" class="schematic" name="unique_form_id" value="JSON netlist..." .../>
//
// other attributes you can add to the input tag:
// width -- width in pixels of diagram
// height -- height in pixels of diagram
// parts -- comma-separated list of parts for parts bin (see parts_map),
// parts="" disables editing of diagram
// JSON schematic representation:
// sch := [part, part, ...]
// part := [type, coords, properties, connections]
// type := string (see parts_map)
// coords := [number, ...] // (x,y,rot) or (x1,y1,x2,y2)
// properties := {name: value, ...}
// connections := [node, ...] // one per connection point in canoncial order
// node := string
// need a netlist? just use the part's type, properites and connections
// TO DO:
// - wire labels?
// - zoom/scroll canvas
// - rotate multiple objects around their center of mass
// - rubber band wires when moving components
// set up each schematic entry widget
function update_schematics() {
// set up each schematic on the page
var schematics = document.getElementsByClassName('schematic');
for (var i = schematics.length - 1; i >= 0; i--)
if (schematics[i].getAttribute("loaded") != "true") {
new schematic.Schematic(schematics[i]);
schematics[i].setAttribute("loaded","true");
}
}
// add ourselves to the tasks that get performed when window is loaded
function add_schematic_handler(other_onload) {
return function() {
// execute othe onload functions first
if (other_onload) other_onload();
update_schematics();
}
}
window.onload = add_schematic_handler(window.onload);
// ask each schematic input widget to update its value field for submission
function prepare_schematics() {
var schematics = document.getElementsByClassName('schematic');
for (var i = schematics.length - 1; i >= 0; i--)
schematics[i].schematic.update_value();
}
schematic = (function() {
background_style = 'rgb(220,220,220)';
element_style = 'rgb(255,255,255)';
thumb_style = 'rgb(128,128,128)';
normal_style = 'rgb(0,0,0)'; // color for unselected components
selected_style = 'rgb(64,255,64)'; // highlight color for selected components
grid_style = "rgb(128,128,128)";
annotation_style = 'rgb(255,64,64)'; // color for diagram annotations
property_size = 5; // point size for Component property text
annotation_size = 6; // point size for diagram annotations
// list of all the defined parts
parts_map = {
'g': [Ground, 'Ground connection'],
'L': [Label, 'Node label'],
'v': [VSource, 'Voltage source'],
'i': [ISource, 'Current source'],
'r': [Resistor, 'Resistor'],
'c': [Capacitor, 'Capacitor'],
'l': [Inductor, 'Inductor'],
'o': [OpAmp, 'Op Amp'],
'd': [Diode, 'Diode'],
'n': [NFet, 'NFet'],
'p': [PFet, 'PFet'],
's': [Probe, 'Scope Probe'],
};
// global clipboard
if (typeof sch_clipboard == 'undefined')
sch_clipboard = [];
///////////////////////////////////////////////////////////////////////////////
//
// Schematic = diagram + parts bin + status area
//
////////////////////////////////////////////////////////////////////////////////
// setup a schematic by populating the <div> with the appropriate children
function Schematic(input) {
// set up diagram viewing parameters
this.grid = 8;
this.scale = 2;
this.origin_x = input.getAttribute("origin_x");
if (this.origin_x == undefined) this.origin_x = 0;
this.origin_y = input.getAttribute("origin_y");
if (this.origin_y == undefined) this.origin_y = 0;
// use user-supplied list of parts if supplied
// else just populate parts bin with all the parts
this.edits_allowed = true;
var parts = input.getAttribute('parts');
if (parts == undefined || parts == 'None') {
parts = new Array();
for (var p in parts_map) parts.push(p);
} else if (parts == '') {
this.edits_allowed = false;
parts = [];
} else parts = parts.split(',');
// now add the parts to the parts bin
this.parts_bin = [];
for (var i = 0; i < parts.length; i++) {
var part = new Part(this);
var pm = parts_map[parts[i]];
part.set_component(new pm[0](0,0,0),pm[1]);
this.parts_bin.push(part);
}
// use user-supplied list of analyses, otherwise provide them all
// analyses="" means no analyses
var analyses = input.getAttribute('analyses');
if (analyses == undefined || analyses == 'None')
analyses = ['dc','ac','tran'];
else if (analyses == '') analyses = [];
else analyses = analyses.split(',');
if (parts.length == 0 && analyses.length == 0) this.diagram_only = true;
else this.diagram_only = false;
// see what we need to submit. Expecting attribute of the form
// submit_analyses="{'tran':[[node_name,t1,t2,t3],...],
// 'ac':[[node_name,f1,f2,...],...]}"
var submit = input.getAttribute('submit_analyses');
if (submit && submit.indexOf('{') != -1)
this.submit_analyses = JSON.parse(submit);
else
this.submit_analyses = undefined;
// toolbar
this.tools = new Array();
this.toolbar = [];
if (this.edits_allowed) {
this.tools['cut'] = this.add_tool(cut_icon,'Cut: move selected components from diagram to the clipboard',this.cut);
this.tools['copy'] = this.add_tool(copy_icon,'Copy: copy selected components into the clipboard',this.copy);
this.tools['paste'] = this.add_tool(paste_icon,'Paste: copy clipboard into the diagram',this.paste);
this.toolbar.push(null); // spacer
}
// simulation interface if cktsim.js is loaded
if (typeof cktsim != 'undefined') {
if (analyses.indexOf('dc') != -1) {
this.tools['dc'] = this.add_tool('DC','DC Analysis',this.dc_analysis);
this.enable_tool('dc',true);
}
if (analyses.indexOf('ac') != -1) {
this.tools['ac'] = this.add_tool('AC','AC Small-Signal Analysis',this.setup_ac_analysis);
this.enable_tool('ac',true);
this.ac_npts = '5'; // default values for AC Analysis
this.ac_fstart = '10';
this.ac_fstop = '10MEG';
this.ac_source_name = undefined;
}
if (analyses.indexOf('tran') != -1) {
this.tools['tran'] = this.add_tool('TRAN','Transient Analysis',this.transient_analysis);
this.enable_tool('tran',true);
this.tran_npts = '100'; // default values for transient analysis
this.tran_tstop = '1';
}
}
// set up diagram canvas
this.canvas = document.createElement('canvas');
this.width = input.getAttribute('width');
this.width = parseInt(this.width == undefined ? '400' : this.width);
this.canvas.width = this.width;
this.height = input.getAttribute('height');
this.height = parseInt(this.height == undefined ? '300' : this.height);
this.canvas.height = this.height;
// repaint simply draws this buffer and then adds selected elements on top
this.bg_image = document.createElement('canvas');
this.bg_image.width = this.width;
this.bg_image.height = this.height;
if (!this.diagram_only) {
this.canvas.tabIndex = 1; // so we get keystrokes
this.canvas.style.borderStyle = 'solid';
this.canvas.style.borderWidth = '1px';
this.canvas.style.borderColor = grid_style;
this.canvas.style.outline = 'none';
}
this.canvas.schematic = this;
if (this.edits_allowed) {
this.canvas.addEventListener('mousemove',schematic_mouse_move,false);
this.canvas.addEventListener('mouseover',schematic_mouse_enter,false);
this.canvas.addEventListener('mouseout',schematic_mouse_leave,false);
this.canvas.addEventListener('mousedown',schematic_mouse_down,false);
this.canvas.addEventListener('mouseup',schematic_mouse_up,false);
this.canvas.addEventListener('dblclick',schematic_double_click,false);
this.canvas.addEventListener('keydown',schematic_key_down,false);
this.canvas.addEventListener('keyup',schematic_key_up,false);
}
// set up message area
if (!this.diagram_only) {
this.status_div = document.createElement('div');
this.status = document.createTextNode('');
this.status_div.appendChild(this.status);
this.status_div.style.height = status_height + 'px';
} else this.status_div = undefined;
this.connection_points = new Array(); // location string => list of cp's
this.components = [];
this.dragging = false;
this.drawCursor = false;
this.cursor_x = 0;
this.cursor_y = 0;
this.draw_cursor = undefined;
this.select_rect = undefined;
this.wire = undefined;
this.operating_point = undefined; // result from DC analysis
this.dc_results = undefined; // saved analysis results for submission
this.ac_results = undefined; // saved analysis results for submission
this.transient_results = undefined; // saved analysis results for submission
// state of modifier keys
this.ctrlKey = false;
this.shiftKey = false;
this.altKey = false;
this.cmdKey = false;
// make sure other code can find us!
input.schematic = this;
this.input = input;
// set up DOM -- use nested tables to do the layout
var table,tr,td;
table = document.createElement('table');
table.rules = 'none';
if (!this.diagram_only) {
table.frame = 'box';
table.style.borderStyle = 'solid';
table.style.borderWidth = '2px';
table.style.borderColor = normal_style;
table.style.backgroundColor = background_style;
}
// add tools to DOM
if (this.toolbar.length > 0) {
tr = document.createElement('tr');
table.appendChild(tr);
td = document.createElement('td');
td.style.verticalAlign = 'top';
td.colSpan = 2;
tr.appendChild(td);
for (var i = 0; i < this.toolbar.length; ++i) {
var tool = this.toolbar[i];
if (tool != null) td.appendChild(tool);
}
}
// add canvas and parts bin to DOM
tr = document.createElement('tr');
table.appendChild(tr);
td = document.createElement('td');
tr.appendChild(td);
var wrapper = document.createElement('div');
td.appendChild(wrapper);
wrapper.style.position = 'relative'; // so we can position subwindows
wrapper.appendChild(this.canvas);
td = document.createElement('td');
td.style.verticalAlign = 'top';
tr.appendChild(td);
var parts_table = document.createElement('table');
td.appendChild(parts_table);
parts_table.rules = 'none';
parts_table.frame = 'void';
parts_table.cellPadding = '0';
parts_table.cellSpacing = '0';
// fill in parts_table
var parts_per_column = Math.floor(this.height / (part_h + 5)); // mysterious extra padding
for (var i = 0; i < parts_per_column; ++i) {
tr = document.createElement('tr');
parts_table.appendChild(tr);
for (var j = i; j < this.parts_bin.length; j += parts_per_column) {
td = document.createElement('td');
tr.appendChild(td);
td.appendChild(this.parts_bin[j].canvas);
}
}
if (this.status_div != undefined) {
tr = document.createElement('tr');
table.appendChild(tr);
td = document.createElement('td');
tr.appendChild(td);
td.colSpan = 2;
td.appendChild(this.status_div);
}
// add to dom
this.input.parentNode.insertBefore(table,this.input.nextSibling);
// process initial contents of diagram
this.load_schematic(this.input.getAttribute('value'),
this.input.getAttribute('initial_value'));
}
part_w = 42; // size of a parts bin compartment
part_h = 42;
status_height = 18;
Schematic.prototype.add_component = function(new_c) {
this.components.push(new_c);
// create undoable edit record here
}
Schematic.prototype.remove_component = function(c) {
var index = this.components.indexOf(c);
if (index != -1) this.components.splice(index,1);
}
// add connection point to list of connection points at that location
Schematic.prototype.add_connection_point = function(cp) {
var cplist = this.connection_points[cp.location];
if (cplist) cplist.push(cp);
else {
cplist = [cp];
this.connection_points[cp.location] = cplist;
}
// return list of conincident connection points
return cplist;
}
// remove connection point from the list points at the old location
Schematic.prototype.remove_connection_point = function(cp,old_location) {
// remove cp from list at old location
var cplist = this.connection_points[old_location];
if (cplist) {
var index = cplist.indexOf(cp);
if (index != -1) {
cplist.splice(index,1);
// if no more connections at this location, remove
// entry from array to keep our search time short
if (cplist.length == 0)
delete this.connection_points[old_location];
}
}
}
// connection point has changed location: remove, then add
Schematic.prototype.update_connection_point = function(cp,old_location) {
this.remove_connection_point(cp,old_location);
return this.add_connection_point(cp);
}
// add a wire to the schematic
Schematic.prototype.add_wire = function(x1,y1,x2,y2) {
var new_wire = new Wire(x1,y1,x2,y2);
new_wire.add(this);
new_wire.move_end();
return new_wire;
}
// see if connection points of component c split any wires
Schematic.prototype.check_wires = function(c) {
for (var i = this.components.length - 1; i >=0; --i) {
var cc = this.components[i];
if (cc != c) { // don't check a component against itself
// only wires will do return non-null from a bisect call
var cp = cc.bisect(c);
if (cp) {
// cc is a wire bisected by connection point cp
// remove biscted wire
cc.delete();
// add two new wires with cp in the middle
this.add_wire(cc.x,cc.y,cp.x,cp.y);
this.add_wire(cc.x+cc.dx,cc.y+cc.dy,cp.x,cp.y);
this.redraw_background();
break;
}
}
}
}
Schematic.prototype.unselect_all = function(which) {
this.operating_point = undefined; // remove annotations
for (var i = this.components.length - 1; i >= 0; --i)
if (i != which) this.components[i].set_select(false);
}
Schematic.prototype.drag_begin = function() {
// let components know they're about to move
for (var i = this.components.length - 1; i >= 0; --i) {
var component = this.components[i];
if (component.selected) component.move_begin();
}
// remember where drag started
this.drag_x = this.cursor_x;
this.drag_y = this.cursor_y;
this.dragging = true;
}
Schematic.prototype.drag_end = function() {
// let components know they're done moving
for (var i = this.components.length - 1; i >= 0; --i) {
var component = this.components[i];
if (component.selected) component.move_end();
}
this.dragging = false;
}
Schematic.prototype.cut = function() {
// clear previous contents
sch_clipboard = [];
// look for selected components, move them to clipboard.
for (var i = this.components.length - 1; i >=0; --i) {
var c = this.components[i];
if (c.selected) {
c.delete();
sch_clipboard.push(c);
}
}
// update diagram view
this.redraw();
}
Schematic.prototype.copy = function() {
// clear previous contents
sch_clipboard = [];
// look for selected components, copy them to clipboard.
for (var i = this.components.length - 1; i >=0; --i) {
var c = this.components[i];
if (c.selected)
sch_clipboard.push(c.clone(c.x,c.y));
}
}
Schematic.prototype.paste = function() {
// compute left,top of bounding box for origins of
// components in the clipboard
var left = undefined;
var top = undefined;
for (var i = sch_clipboard.length - 1; i >= 0; --i) {
var c = sch_clipboard[i];
left = left ? Math.min(left,c.x) : c.x;
top = top ? Math.min(top,c.y) : c.y;
}
this.message('cursor '+this.cursor_x+','+this.cursor_y);
// clear current selections
this.unselect_all(-1);
this.redraw_background(); // so we see any components that got unselected
// make clones of components on the clipboard, positioning
// them relative to the cursor
for (var i = sch_clipboard.length - 1; i >= 0; --i) {
var c = sch_clipboard[i];
var new_c = c.clone(this.cursor_x + (c.x - left),this.cursor_y + (c.y - top));
new_c.set_select(true);
new_c.add(this);
}
// see what we've wrought
this.redraw();
}
///////////////////////////////////////////////////////////////////////////////
//
// Netlist and Simulation interface
//
////////////////////////////////////////////////////////////////////////////////
// load diagram from JSON representation
Schematic.prototype.load_schematic = function(value,initial_value) {
// use default value if no schematic info in value
if (value == undefined || value.indexOf('[') == -1)
value = initial_value;
if (value && value.indexOf('[') != -1) {
// convert string value into data structure
var json = JSON.parse(value);
// top level is a list of components
for (var i = json.length - 1; i >= 0; --i) {
var c = json[i];
if (c[0] == 'view') {
// special hack: view component lets us recreate view
this.origin_x = c[1];
this.origin_y = c[2];
this.scale = c[3];
this.ac_npts = c[4];
this.ac_fstart = c[5];
this.ac_fstop = c[6];
this.ac_source_name = c[7];
this.tran_npts = c[8];
this.tran_tstop = c[9];
} else if (c[0] == 'w') {
// wire
this.add_wire(c[1][0],c[1][1],c[1][2],c[1][3]);
} else if (c[0] == 'dc') {
this.dc_results = c[1];
} else if (c[0] == 'transient') {
this.transient_results = c[1];
} else if (c[0] == 'ac') {
this.ac_results = c[1];
} else {
// ordinary component
// c := [type, coords, properties, connections]
var type = c[0];
var coords = c[1];
var properties = c[2];
// make the part
var part = new parts_map[type][0](coords[0],coords[1],coords[2]);
// give it its properties
for (var name in properties)
part.properties[name] = properties[name];
// add component to the diagram
part.add(this);
}
}
}
// see what we've got!
this.redraw_background();
}
// label all the nodes in the circuit
Schematic.prototype.label_connection_points = function() {
// start by clearing all the connection point labels
for (var i = this.components.length - 1; i >=0; --i)
this.components[i].clear_labels();
// components are in charge of labeling their unlabeled connections.
// labels given to connection points will propagate to coincident connection
// points and across Wires.
// let special components like GND label their connection(s)
for (var i = this.components.length - 1; i >=0; --i)
this.components[i].add_default_labels();
// now have components generate labels for unlabeled connections
this.next_label = 0;
for (var i = this.components.length - 1; i >=0; --i)
this.components[i].label_connections();
}
// generate a new label
Schematic.prototype.get_next_label = function() {
// generate next label in sequence
this.next_label += 1;
return this.next_label.toString();
}
// propagate label to coincident connection points
Schematic.prototype.propagate_label = function(label,location) {
var cplist = this.connection_points[location];
for (var i = cplist.length - 1; i >= 0; --i)
cplist[i].propagate_label(label);
}
// update the value field of our corresponding input field with JSON
// representation of schematic
Schematic.prototype.update_value = function() {
// label connection points
this.label_connection_points();
// build JSON data structure, convert to string value for
// input field
this.input.value = JSON.stringify(this.json_with_analyses());
}
// produce a JSON representation of the diagram
Schematic.prototype.json = function() {
var json = [];
// output all the components/wires in the diagram
var n = this.components.length;
for (var i = 0; i < n; i++)
json.push(this.components[i].json(i));
// capture the current view parameters
json.push(['view',this.origin_x,this.origin_y,this.scale,
this.ac_npts,this.ac_fstart,this.ac_fstop,this.ac_source_name,
this.tran_npts,this.tran_tstop]);
return json;
}
// produce a JSON representation of the diagram
Schematic.prototype.json_with_analyses = function() {
var json = this.json();
if (this.dc_results != undefined) json.push(['dc',this.dc_results]);
if (this.ac_results != undefined) json.push(['ac',this.ac_results]);
if (this.transient_results != undefined) json.push(['transient',this.transient_results]);
return json;
}
///////////////////////////////////////////////////////////////////////////////
//
// Simulation interface
//
////////////////////////////////////////////////////////////////////////////////
Schematic.prototype.extract_circuit = function() {
// give all the circuit nodes a name, extract netlist
this.label_connection_points();
var netlist = this.json();
// since we've done the heavy lifting, update input field value
// so user can grab diagram if they want
this.input.value = JSON.stringify(netlist);
// create a circuit from the netlist
var ckt = new cktsim.Circuit();
if (ckt.load_netlist(netlist))
return ckt;
else
return null;
}
Schematic.prototype.dc_analysis = function() {
// remove any previous annotations
this.unselect_all(-1);
this.redraw_background();
var ckt = this.extract_circuit();
if (ckt === null) return;
// run the analysis
this.operating_point = ckt.dc();
// save a copy of the results for submission
this.dc_results = {};
for (var i in this.operating_point) this.dc_results[i] = this.operating_point[i];
// display results on diagram
this.redraw();
}
// return a list of [color,node_label] for each probe in the diagram
Schematic.prototype.find_probes = function() {
var result = [];
for (var i = this.components.length - 1; i >= 0; --i) {
var c = this.components[i];
if (c.type == 's') result.push(c.probe_info());
}
return result;
}
// use a dialog to get AC analysis parameters
Schematic.prototype.setup_ac_analysis = function() {
this.unselect_all(-1);
this.redraw_background();
var npts_lbl = 'Number of points/decade';
var fstart_lbl = 'Starting frequency (Hz)';
var fstop_lbl = 'Ending frequency (Hz)';
var source_name_lbl = 'Name of V or I source for ac'
if (this.find_probes().length == 0) {
alert("AC Analysis: there are no scope probes in the diagram!");
return;
}
var fields = new Array();
fields[npts_lbl] = build_input('text',10,this.ac_npts);
fields[fstart_lbl] = build_input('text',10,this.ac_fstart);
fields[fstop_lbl] = build_input('text',10,this.ac_fstop);
fields[source_name_lbl] = build_input('text',10,this.ac_source_name);
var content = build_table(fields);
content.fields = fields;
content.sch = this;
this.dialog('AC Analysis',content,function(content) {
var sch = content.sch;
// retrieve parameters, remember for next time
sch.ac_npts = content.fields[npts_lbl].value;
sch.ac_fstart = content.fields[fstart_lbl].value;
sch.ac_fstop = content.fields[fstop_lbl].value;
sch.ac_source_name = content.fields[source_name_lbl].value;
sch.ac_analysis(cktsim.parse_number(sch.ac_npts),
cktsim.parse_number(sch.ac_fstart),
cktsim.parse_number(sch.ac_fstop),
sch.ac_source_name);
});
}
// perform ac analysis
Schematic.prototype.ac_analysis = function(npts,fstart,fstop,ac_source_name) {
// run the analysis
var ckt = this.extract_circuit();
if (ckt === null) return;
var results = ckt.ac(npts,fstart,fstop,ac_source_name);
if (typeof results == 'string')
this.message(results);
else {
if (this.submit_analyses != undefined) {
var submit = this.submit_analyses['ac'];
if (submit != undefined) {
// save a copy of the results for submission
sch.ac_results = {};
var freqs = results['_frequencies_'];
// save requested values for each requested node
for (var j = 0; j < submit.length; j++) {
var flist = submit[j]; // [node_name,f1,f2,...]
var node = flist[0];
var values = results[node];
var fvlist = [];
// for each requested freq, interpolate response value
for (var k = 1; k < flist.length; k++) {
var f = flist[k];
var v = interpolate(f,freqs,values);
fvlist.push([f,v == undefined ? 'undefined' : v]);
}
// save results as list of [f,response] paris
this.ac_results[node] = fvlist;
}
}
}
var x_values = results['_frequencies_'];
// x axis will be a log scale
for (var i = x_values.length - 1; i >= 0; --i)
x_values[i] = Math.log(x_values[i])/Math.LN10;
// set up plot values for each node with a probe
var y_values = []; // list of [color, result_array]
var probes = this.find_probes();
var probe_maxv = [];
var probe_color = [];
// Check for probe with near zero transfer function and warn
for (var i = probes.length - 1; i >= 0; --i) {
probe_color[i] = probes[i][0];
var label = probes[i][1];
var v = results[label];
probe_maxv[i] = array_max(v); // magnitudes always > 0
}
var all_max = array_max(probe_maxv);
for (var i = probes.length - 1; i >= 0; --i) {
if ((probe_maxv[i] / all_max) < 1.0e-10) {
alert('Near zero ac response, remove ' + probe_color[i] + ' probe');
return;
}
}
for (var i = probes.length - 1; i >= 0; --i) {
var color = probes[i][0];
var label = probes[i][1];
var v = results[label];
// convert values into dB relative to source amplitude
var v_max = 1;
for (var j = v.length - 1; j >= 0; --j)
// convert each value to dB relative to max
v[j] = 20.0 * Math.log(v[j]/v_max)/Math.LN10;
y_values.push([color,v]);
}
// graph the result and display in a window
var graph = this.graph(x_values,y_values,'log(Frequency)','dB');
this.window('Results of AC Analysis',graph);
}
}
Schematic.prototype.transient_analysis = function() {
this.unselect_all(-1);
this.redraw_background();
var npts_lbl = 'Minimum number of timepoints';
var tstop_lbl = 'Stop Time (seconds)';
if (this.find_probes().length == 0) {
alert("Transient Analysis: there are no probes in the diagram!");
return;
}
var fields = new Array();
fields[npts_lbl] = build_input('text',10,this.tran_npts);
fields[tstop_lbl] = build_input('text',10,this.tran_tstop);
var content = build_table(fields);
content.fields = fields;
content.sch = this;
this.dialog('Transient Analysis',content,function(content) {
var sch = content.sch;
var ckt = sch.extract_circuit();
if (ckt === null) return;
// retrieve parameters, remember for next time
sch.tran_npts = content.fields[npts_lbl].value;
sch.tran_tstop = content.fields[tstop_lbl].value;
// gather a list of nodes that are being probed. These
// will be added to the list of nodes checked during the
// LTE calculations in transient analysis
var probe_list = sch.find_probes();
var probe_names = new Array(probe_list.length);
for (var i = probe_list.length - 1; i >= 0; --i)
probe_names[i] = probe_list[i][1];
// run the analysis
var results = ckt.tran(ckt.parse_number(sch.tran_npts), 0,
ckt.parse_number(sch.tran_tstop), probe_names, false);
if (typeof results == 'string')
sch.message(results);
else {
if (sch.submit_analyses != undefined) {
var submit = sch.submit_analyses['tran'];
if (submit != undefined) {
// save a copy of the results for submission
sch.transient_results = {};
var times = results['_time_'];
// save requested values for each requested node
for (var j = 0; j < submit.length; j++) {
var tlist = submit[j]; // [node_name,t1,t2,...]
var node = tlist[0];
var values = results[node];
var tvlist = [];
// for each requested time, interpolate waveform value
for (var k = 1; k < tlist.length; k++) {
var t = tlist[k];
var v = interpolate(t,times,values);
tvlist.push([t,v == undefined ? 'undefined' : v]);
}
// save results as list of [t,value] pairs
sch.transient_results[node] = tvlist;
}
}
}
var x_values = results['_time_'];
// set up plot values for each node with a probe
var y_values = []; // list of [color, result_array]
var probes = sch.find_probes();
for (var i = probes.length - 1; i >= 0; --i) {
var color = probes[i][0];
var label = probes[i][1];
var v = results[label];
y_values.push([color,v]);
}
// graph the result and display in a window
var graph = sch.graph(x_values,y_values,'Time','Voltage');
sch.window('Results of Transient Analysis',graph);
}
})
}
// t is the time at which we want a value
// times is a list of timepoints from the simulation
function interpolate(t,times,values) {
if (values == undefined) return undefined;
for (var i = 0; i < times.length; i++)
if (t < times[i]) {
// t falls between times[i-1] and times[i]
var t1 = (i == 0) ? times[0] : times[i-1];
var t2 = times[i];
if (t2 == undefined) return undefined;
var v1 = (i == 0) ? values[0] : values[i-1];
var v2 = values[i];
var v = v1;
if (t != t1) v += (t - t1)*(v2 - v1)/(t2 - t1);
return v;
}
}
// external interface for setting the property value of a named component
Schematic.prototype.set_property = function(component_name,property,value) {
this.unselect_all(-1);
for (var i = this.components.length - 1; i >= 0; --i) {
var component = this.components[i];
if (component.properties['name'] == component_name) {
component.properties[property] = value.toString();
break;
}
}
// update diagram
this.redraw_background();
}
///////////////////////////////////////////////////////////////////////////////
//
// Drawing support -- deals with scaling and scrolling of diagrama
//
////////////////////////////////////////////////////////////////////////////////
// here to redraw background image containing static portions of the schematic.
// Also redraws dynamic portion.
Schematic.prototype.redraw_background = function() {
var c = this.bg_image.getContext('2d');
c.lineCap = 'round';
// paint background color
c.fillStyle = element_style;
c.fillRect(0,0,this.width,this.height);
if (!this.diagram_only) {
// grid
c.strokeStyle = grid_style;
var first_x = 0;
var last_x = this.width/this.scale;
var first_y = 0;
var last_y = this.height/this.scale;
for (var i = first_x; i < last_x; i += this.grid)
this.draw_line(c,i,first_y,i,last_y,0.1);
for (var i = first_y; i < last_y; i += this.grid)
this.draw_line(c,first_x,i,last_x,i,0.1);
}
// unselected components
for (var i = this.components.length - 1; i >= 0; --i) {
var component = this.components[i];
if (!component.selected) component.draw(c);
}
this.redraw(); // background changed, redraw on screen
}
// redraw what user sees = static image + dynamic parts
Schematic.prototype.redraw = function() {
var c = this.canvas.getContext('2d');
// put static image in the background
c.drawImage(this.bg_image, 0, 0);
// selected components
var selections = false;
for (var i = this.components.length - 1; i >= 0; --i) {
var component = this.components[i];
if (component.selected) {
component.draw(c);
selections = true;
}
}
this.enable_tool('cut',selections);
this.enable_tool('copy',selections);
this.enable_tool('paste',sch_clipboard.length > 0);
// connection points: draw one at each location
for (var location in this.connection_points) {
var cplist = this.connection_points[location];
cplist[0].draw(c,cplist.length);
}
// draw new wire
if (this.wire) {
var r = this.wire;
c.strokeStyle = selected_style;
this.draw_line(c,r[0],r[1],r[2],r[3],1);
}
// draw selection rectangle
if (this.select_rect) {
var r = this.select_rect;
c.lineWidth = 1;
c.strokeStyle = selected_style;
c.beginPath();
c.moveTo(r[0],r[1]);
c.lineTo(r[0],r[3]);
c.lineTo(r[2],r[3]);
c.lineTo(r[2],r[1]);
c.lineTo(r[0],r[1]);
c.stroke();
}
// display operating point results
if (this.operating_point) {
if (typeof this.operating_point == 'string')
this.message(this.operating_point);
else {
// make a copy of the operating_point info so we can mess with it
var temp = new Array();
for (var i in this.operating_point) temp[i] = this.operating_point[i];
// run through connection points displaying (once) the voltage
// for each electrical node
for (var location in this.connection_points)
(this.connection_points[location])[0].display_voltage(c,temp);
// let components display branch current info if available
for (var i = this.components.length - 1; i >= 0; --i)
this.components[i].display_current(c,temp)
}
}
// finally overlay cursor
if (this.drawCursor && this.draw_cursor) {
//var x = this.cursor_x;
//var y = this.cursor_y;
//this.draw_text(c,'('+x+','+y+')',x+this.grid,y-this.grid,10);
this.draw_cursor(c,this.cursor_x,this.cursor_y);
}
}
// draws a cross cursor
Schematic.prototype.cross_cursor = function(c,x,y) {
this.draw_line(c,x-this.grid,y,x+this.grid,y,1);
this.draw_line(c,x,y-this.grid,x,y+this.grid,1);
}
Schematic.prototype.moveTo = function(c,x,y) {
c.moveTo((x - this.origin_x) * this.scale,(y - this.origin_y) * this.scale);
}
Schematic.prototype.lineTo = function(c,x,y) {
c.lineTo((x - this.origin_x) * this.scale,(y - this.origin_y) * this.scale);
}
Schematic.prototype.draw_line = function(c,x1,y1,x2,y2,width) {
c.lineWidth = width*this.scale;
c.beginPath();
c.moveTo((x1 - this.origin_x) * this.scale,(y1 - this.origin_y) * this.scale);
c.lineTo((x2 - this.origin_x) * this.scale,(y2 - this.origin_y) * this.scale);
c.stroke();
}
Schematic.prototype.draw_arc = function(c,x,y,radius,start_radians,end_radians,anticlockwise,width,filled) {
c.lineWidth = width*this.scale;
c.beginPath();
c.arc((x - this.origin_x)*this.scale,(y - this.origin_y)*this.scale,radius*this.scale,
start_radians,end_radians,anticlockwise);
if (filled) c.fill();
else c.stroke();
}
Schematic.prototype.draw_text = function(c,text,x,y,size) {
c.font = size*this.scale+'pt sans-serif'
c.fillText(text,(x - this.origin_x) * this.scale,(y - this.origin_y) * this.scale);
}
// add method to canvas to compute relative coords for event
HTMLCanvasElement.prototype.relMouseCoords = function(event){
// run up the DOM tree to figure out coords for top,left of canvas
var totalOffsetX = 0;
var totalOffsetY = 0;
var currentElement = this;
do {
totalOffsetX += currentElement.offsetLeft;
totalOffsetY += currentElement.offsetTop;
}
while (currentElement = currentElement.offsetParent);
// now compute relative position of click within the canvas
this.mouse_x = event.pageX - totalOffsetX;
this.mouse_y = event.pageY - totalOffsetY;
this.page_x = event.pageX;
this.page_y = event.pageY;
}
///////////////////////////////////////////////////////////////////////////////
//
// Event handling
//
////////////////////////////////////////////////////////////////////////////////
// process keystrokes, consuming those that are meaningful to us
function schematic_key_down(event) {
if (!event) event = window.event;
var sch = (window.event) ? event.srcElement.schematic : event.target.schematic;
var code = event.keyCode;
// keep track of modifier key state
if (code == 16) sch.shiftKey = true;
else if (code == 17) sch.ctrlKey = true;
else if (code == 18) sch.altKey = true;
else if (code == 91) sch.cmdKey = true;
// backspace or delete: delete selected components
else if (code == 8 || code == 46) {
// delete selected components
for (var i = sch.components.length - 1; i >= 0; --i) {
var component = sch.components[i];
if (component.selected) component.delete(1);
}
}
// cmd/ctrl x: cut
else if ((sch.ctrlKey || sch.cmdKey) && code == 88) {
sch.cut();
event.preventDefault();
return false;
}
// cmd/ctrl c: copy
else if ((sch.ctrlKey || sch.cmdKey) && code == 67) {
sch.copy();
event.preventDefault();
return false;
}
// cmd/ctrl v: paste
else if ((sch.ctrlKey || sch.cmdKey) && code == 86) {
sch.paste();
event.preventDefault();
return false;
}
// 'r': rotate component
else if (!sch.ctrlKey && !sch.altKey && !sch.cmdKey && code == 82) {
// rotate
for (var i = sch.components.length - 1; i >= 0; --i) {
var component = sch.components[i];
if (component.selected) component.rotate(1);
}
sch.redraw();
event.preventDefault();
return false;
}
else return true;
// consume keystroke
sch.redraw();
event.preventDefault();
return false;
}
function schematic_key_up(event) {
if (!event) event = window.event;
var sch = (window.event) ? event.srcElement.schematic : event.target.schematic;
var code = event.keyCode;
if (code == 16) sch.shiftKey = false;
else if (code == 17) sch.ctrlKey = false;
else if (code == 18) sch.altKey = false;
else if (code == 91) sch.cmdKey = false;
}
function schematic_mouse_enter(event) {
if (!event) event = window.event;
var sch = (window.event) ? event.srcElement.schematic : event.target.schematic;
// see if user has selected a new part
if (sch.new_part) {
// revert handler
document.onselectstart = sch.saved_onselectstart;
// grab incoming part, turn off selection of parts bin
var part = sch.new_part;
sch.new_part = undefined;
part.select(false);
// unselect everything else in the schematic, add part and select it
sch.unselect_all(-1);
sch.redraw_background(); // so we see any components that got unselected
// make a clone of the component in the parts bin
part = part.component.clone(sch.cursor_x,sch.cursor_y);
part.add(sch); // add it to schematic
part.set_select(true);
// and start dragging it
sch.drag_begin();
}
sch.drawCursor = true;
sch.redraw();
sch.canvas.focus(); // capture key strokes
return false;
}
function schematic_mouse_leave(event) {
if (!event) event = window.event;
var sch = (window.event) ? event.srcElement.schematic : event.target.schematic;
sch.drawCursor = false;
sch.redraw();
return false;
}
function schematic_mouse_down(event) {
if (!event) event = window.event;
else event.preventDefault();
var sch = (window.event) ? event.srcElement.schematic : event.target.schematic;
// determine where event happened in schematic coordinates
sch.canvas.relMouseCoords(event);
var x = sch.canvas.mouse_x/sch.scale + sch.origin_x;
var y = sch.canvas.mouse_y/sch.scale + sch.origin_y;
sch.cursor_x = Math.round(x/sch.grid) * sch.grid;
sch.cursor_y = Math.round(y/sch.grid) * sch.grid;
// is mouse over a connection point? If so, start dragging a wire
var cplist = sch.connection_points[sch.cursor_x + ',' + sch.cursor_y];
if (cplist && !event.shiftKey) {
sch.unselect_all(-1);
sch.wire = [sch.cursor_x,sch.cursor_y,sch.cursor_x,sch.cursor_y];
} else {
// give all components a shot at processing the selection event
var which = -1;
for (var i = sch.components.length - 1; i >= 0; --i)
if (sch.components[i].select(x,y,event.shiftKey)) {
if (sch.components[i].selected) {
sch.drag_begin();
which = i; // keep track of component we found
}
break;
}
// did we just click on a previously selected component?
var reselect = which!=-1 && sch.components[which].was_previously_selected;
if (!event.shiftKey) {
// if shift key isn't pressed and we didn't click on component
// that was already selected, unselect everyone except component
// we just clicked on
if (!reselect) sch.unselect_all(which);
// if there's nothing to drag, set up a selection rectangle
if (!sch.dragging) sch.select_rect = [sch.canvas.mouse_x,sch.canvas.mouse_y,
sch.canvas.mouse_x,sch.canvas.mouse_y];
}
}
sch.redraw_background();
return false;
}
function schematic_mouse_move(event) {
if (!event) event = window.event;
var sch = (window.event) ? event.srcElement.schematic : event.target.schematic;
sch.canvas.relMouseCoords(event);
var x = sch.canvas.mouse_x/sch.scale + sch.origin_x;
var y = sch.canvas.mouse_y/sch.scale + sch.origin_y;
sch.cursor_x = Math.round(x/sch.grid) * sch.grid;
sch.cursor_y = Math.round(y/sch.grid) * sch.grid;
if (sch.wire) {
// update new wire end point
sch.wire[2] = sch.cursor_x;
sch.wire[3] = sch.cursor_y;
} else if (sch.dragging) {
// see how far we moved
var dx = sch.cursor_x - sch.drag_x;
var dy = sch.cursor_y - sch.drag_y;
if (dx != 0 || dy != 0) {
// update position for next time
sch.drag_x = sch.cursor_x;
sch.drag_y = sch.cursor_y;
// give all components a shot at processing the event
for (var i = sch.components.length - 1; i >= 0; --i) {
var component = sch.components[i];
if (component.selected) component.move(dx,dy);
}
}
} else if (sch.select_rect) {
// update moving corner of selection rectangle
sch.select_rect[2] = sch.canvas.mouse_x;
sch.select_rect[3] = sch.canvas.mouse_y;
//sch.message(sch.select_rect.toString());
}
// just redraw dynamic components
sch.redraw();
//sch.message(sch.canvas.page_x + ',' + sch.canvas.page_y + ';' + sch.canvas.mouse_x + ',' + sch.canvas.mouse_y + ';' + sch.cursor_x + ',' + sch.cursor_y);
return false;
}
function schematic_mouse_up(event) {
if (!event) event = window.event;
else event.preventDefault();
var sch = (window.event) ? event.srcElement.schematic : event.target.schematic;
// drawing a new wire
if (sch.wire) {
var r = sch.wire;
sch.wire = undefined;
if (r[0]!=r[2] || r[1]!=r[3]) {
// insert wire component
sch.add_wire(r[0],r[1],r[2],r[3]);
sch.redraw_background();
} else sch.redraw();
}
// dragging
if (sch.dragging) sch.drag_end();
// selection rectangle
if (sch.select_rect) {
var r = sch.select_rect;
// if select_rect is a point, we've already dealt with selection
// in mouse_down handler
if (r[0]!=r[2] || r[1]!=r[3]) {
// convert to schematic coordinates
var s = [r[0]/sch.scale + sch.origin_x, r[1]/sch.scale + sch.origin_y,
r[2]/sch.scale + sch.origin_x, r[3]/sch.scale + sch.origin_y];
canonicalize(s);
if (!event.shiftKey) sch.unselect_all();
// select components that intersect selection rectangle
for (var i = sch.components.length - 1; i >= 0; --i)
sch.components[i].select_rect(s,event.shiftKey);
}
sch.select_rect = undefined;
sch.redraw_background();
}
return false;
}
function schematic_double_click(event) {
if (!event) event = window.event;
else event.preventDefault();
var sch = (window.event) ? event.srcElement.schematic : event.target.schematic;
// determine where event happened in schematic coordinates
sch.canvas.relMouseCoords(event);
var x = sch.canvas.mouse_x/sch.scale + sch.origin_x;
var y = sch.canvas.mouse_y/sch.scale + sch.origin_y;
sch.cursor_x = Math.round(x/sch.grid) * sch.grid;
sch.cursor_y = Math.round(y/sch.grid) * sch.grid;
// see if we double-clicked a component. If so, edit it's properties
for (var i = sch.components.length - 1; i >= 0; --i)
if (sch.components[i].edit_properties(x,y))
break;
return false;
}
///////////////////////////////////////////////////////////////////////////////
//
// Status message and dialogs
//
////////////////////////////////////////////////////////////////////////////////
Schematic.prototype.message = function(message) {
this.status.nodeValue = message;
}
Schematic.prototype.append_message = function(message) {
this.status.nodeValue += ' / '+message;
}
// set up a dialog with specified title, content and two buttons at
// the bottom: OK and Cancel. If Cancel is clicked, dialog goes away
// and we're done. If OK is clicked, dialog goes away and the
// callback function is called with the content as an argument (so
// that the values of any fields can be captured).
Schematic.prototype.dialog = function(title,content,callback) {
// create the div for the top level of the dialog, add to DOM
var dialog = document.createElement('div');
dialog.sch = this;
dialog.content = content;
dialog.callback = callback;
// div to hold the content
var body = document.createElement('div');
content.style.marginBotton = '5px';
body.appendChild(content);
body.style.padding = '5px';
dialog.appendChild(body);
// OK button
var ok_button = document.createElement('span');
ok_button.appendChild(document.createTextNode('OK'));
ok_button.dialog = dialog; // for the handler to use
ok_button.addEventListener('click',dialog_okay,false);
ok_button.style.display = 'inline';
ok_button.style.border = '1px solid';
ok_button.style.padding = '5px';
ok_button.style.margin = '10px';
// cancel button
var cancel_button = document.createElement('span');
cancel_button.appendChild(document.createTextNode('Cancel'));
cancel_button.dialog = dialog; // for the handler to use
cancel_button.addEventListener('click',dialog_cancel,false);
cancel_button.style.display = 'inline';
cancel_button.style.border = '1px solid';
cancel_button.style.padding = '5px';
cancel_button.style.margin = '10px';
// div to hold the two buttons
var buttons = document.createElement('div');
buttons.style.textAlign = 'center';
buttons.appendChild(ok_button);
buttons.appendChild(cancel_button);
buttons.style.padding = '5px';
buttons.style.margin = '10px';
dialog.appendChild(buttons);
// put into an overlay window
this.window(title,dialog);
}
// callback when user click "Cancel" in a dialog
function dialog_cancel(event) {
if (!event) event = window.event;
var dialog = (window.event) ? event.srcElement.dialog : event.target.dialog;
window_close(dialog.win);
}
// callback when user click "OK" in a dialog
function dialog_okay(event) {
if (!event) event = window.event;
var dialog = (window.event) ? event.srcElement.dialog : event.target.dialog;
window_close(dialog.win);
// invoke the callback with the dialog contents as the argument
if (dialog.callback) dialog.callback(dialog.content);
}
///////////////////////////////////////////////////////////////////////////////
//
// Draggable, resizeable, closeable window
//
////////////////////////////////////////////////////////////////////////////////
// build a 2-column HTML table from an associative array (keys as text in
// column 1, values in column 2).
function build_table(a) {
var tbl = document.createElement('table');
// build a row for each element in associative array
for (var i in a) {
var label = document.createTextNode(i + ': ');
var col1 = document.createElement('td');
col1.appendChild(label);
var col2 = document.createElement('td');
col2.appendChild(a[i]);
var row = document.createElement('tr');
row.appendChild(col1);
row.appendChild(col2);
row.style.verticalAlign = 'center';
tbl.appendChild(row);
}
return tbl;
}
// build an input field
function build_input(type,size,value) {
var input = document.createElement('input');
input.type = type;
input.size = size;
if (value == undefined) input.value = '';
else input.value = value.toString();
return input;
}
// build a select widget using the strings found in the options array
function build_select(options,selected) {
var select = document.createElement('select');
for (var i = 0; i < options.length; i++) {
var option = document.createElement('option');
option.text = options[i];
select.add(option);
if (options[i] == selected) select.selectedIndex = i;
}
return select;
}
Schematic.prototype.window = function(title,content) {
// create the div for the top level of the window
var win = document.createElement('div');
win.sch = this;
win.content = content;
win.drag_x = undefined;
win.draw_y = undefined;
// div to hold the title
var head = document.createElement('div');
head.style.backgroundColor = 'black';
head.style.color = 'white';
head.style.textAlign = 'center';
head.style.padding = '5px';
head.appendChild(document.createTextNode(title));
var close_button = new Image();
close_button.src = close_icon;
close_button.style.cssFloat = 'right';
close_button.addEventListener('click',window_close_button,false);
close_button.win = win;
head.appendChild(close_button);
win.appendChild(head);
// capture mouse events in title bar
head.addEventListener('mousedown',window_mouse_down,false);
head.addEventListener('mouseup',window_mouse_up,false);
head.addEventListener('mouseout',window_mouse_up,false);
head.addEventListener('mousemove',window_mouse_move,false);
// div to hold the content
//var body = document.createElement('div');
//body.appendChild(content);
win.appendChild(content);
content.win = win; // so content can contact us
// compute location relative to canvas
win.left = this.canvas.mouse_x;
win.top = this.canvas.mouse_y;
// add to DOM
win.style.background = 'white';
win.style.zindex = '1000';
win.style.position = 'absolute';
win.style.left = win.left + 'px';
win.style.top = win.top + 'px';
win.style.border = '2px solid';
this.canvas.parentNode.insertBefore(win,this.canvas);
//this.input.parentNode.insertBefore(win,this.input.nextSibling);
}
// close the window
function window_close(win) {
// remove the windw from the top-level div of the schematic
win.parentNode.removeChild(win);
}
function window_close_button(event) {
if (!event) event = window.event;
var src = (window.event) ? event.srcElement : event.target;
window_close(src.win);
}
// capture mouse events in title bar of window
function window_mouse_down(event) {
if (!event) event = window.event;
var src = (window.event) ? event.srcElement : event.target;
var win = src.parentNode;
// remember where mouse is so we can compute dx,dy during drag
win.drag_x = event.pageX;
win.drag_y = event.pageY;
return false;
}
function window_mouse_up(event) {
if (!event) event = window.event;
var src = (window.event) ? event.srcElement : event.target;
var win = src.parentNode;
// show's over folks...
win.drag_x = undefined;
win.drag_y = undefined;
return false;
}
function window_mouse_move(event) {
if (!event) event = window.event;
var win = (window.event) ? event.srcElement.parentNode : event.target.parentNode;
if (win.drag_x) {
var dx = event.pageX - win.drag_x;
var dy = event.pageY - win.drag_y;
// move the window
win.left += dx;
win.top += dy;
win.style.left = win.left + 'px';
win.style.top = win.top + 'px';
// update reference point
win.drag_x += dx;
win.drag_y += dy;
return false;
}
}
///////////////////////////////////////////////////////////////////////////////
//
// Toolbar
//
////////////////////////////////////////////////////////////////////////////////
Schematic.prototype.add_tool = function(icon,tip,callback) {
var tool;
if (icon.search('data:image') != -1) {
tool = document.createElement('img');
tool.src = icon;
} else {
tool = document.createElement('span');
tool.style.font = 'small-caps small sans-serif';
var label = document.createTextNode(icon);
tool.appendChild(label);
}
// decorate tool
tool.style.borderWidth = '1px';
tool.style.borderStyle = 'solid';
tool.style.borderColor = background_style;
tool.style.padding = '2px';
// set up event processing
tool.addEventListener('mouseover',tool_enter,false);
tool.addEventListener('mouseout',tool_leave,false);
tool.addEventListener('click',tool_click,false);
// add to toolbar
tool.sch = this;
tool.tip = tip;
tool.callback = callback;
this.toolbar.push(tool);
tool.enabled = false;
tool.style.opacity = 0.2;
return tool;
}
Schematic.prototype.enable_tool = function(tname,which) {
var tool = this.tools[tname];
if (tool != undefined) {
tool.style.opacity = which ? 1.0 : 0.2;
tool.enabled = which;
// if disabling tool, remove border and tip
if (!which) {
tool.style.borderColor = background_style;
tool.sch.message('');
}
}
}
// highlight tool button by turning on border, changing background
function tool_enter(event) {
if (!event) event = window.event;
var tool = (window.event) ? event.srcElement : event.target;
if (tool.enabled) {
tool.style.borderColor = normal_style;
tool.sch.message(tool.tip);
tool.opacity = 1.0;
}
}
// unhighlight tool button by turning off border, reverting to normal background
function tool_leave(event) {
if (!event) event = window.event;
var tool = (window.event) ? event.srcElement : event.target;
if (tool.enabled) {
tool.style.borderColor = background_style;
tool.sch.message('');
}
}
// handle click on a tool
function tool_click(event) {
if (!event) event = window.event;
var tool = (window.event) ? event.srcElement : event.target;
if (tool.enabled) {
tool.sch.canvas.relMouseCoords(event); // so we can position pop-up window correctly
tool.callback.call(tool.sch);
}
}
cut_icon = 'data:image/gif;base64,R0lGODlhEAAQALMAAAAAAIAAAACAAICAAAAAgIAAgACAgMDAwICAgP8AAAD/AP//AAAA//8A/wD//////yH5BAEAAAcALAAAAAAQABAAAAQu8MhJqz1g5qs7lxv2gRkQfuWomarXEgDRHjJhf3YtyRav0xcfcFgR0nhB5OwTAQA7';
copy_icon = 'data:image/gif;base64,R0lGODlhEAAQALMAAAAAAIAAAACAAICAAAAAgIAAgACAgMDAwICAgP8AAAD/AP//AAAA//8A/wD//////yH5BAEAAAcALAAAAAAQABAAAAQ+8MhJ6wE4Wwqef9gmdV8HiKZJrCz3ecS7TikWfzExvk+M9a0a4MbTkXCgTMeoHPJgG5+yF31SLazsTMTtViIAOw==';
paste_icon = 'data:image/gif;base64,R0lGODlhEAAQALMAAAAAAIAAAACAAICAAAAAgIAAgACAgMDAwICAgP8AAAD/AP//AAAA//8A/wD//////yH5BAEAAAcALAAAAAAQABAAAARL8MhJqwUYWJnxWp3GDcgAgCdQIqLKXmVLhhnyHiqpr7rME8AgocVDEB5IJHD0SyofBFzxGIQGAbvB0ZkcTq1CKK6z5YorwnR0w44AADs=';
close_icon = 'data:image/gif;base64,R0lGODlhEAAQAMQAAGtra/f3/62tre/v9+bm787O1pycnHNzc6WlpcXFxd7e3tbW1nt7e7W1te/v74SEhMXFzmNjY+bm5v///87OzgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAAAAAAALAAAAAAQABAAAAVt4DRMZGmSwRQQBUS9MAwRIyQ5Uq7neEFSDtxOF4T8cobIQaE4RAQ5yjHHiCCSD510QtFGvoCFdppDfBu7bYzy+D7WP5ggAgA8Y3FKwi5IAhIweW1vbBGEWy5rilsFi2tGAwSJixAFBCkpJ5ojIQA7';
///////////////////////////////////////////////////////////////////////////////
//
// Graphing
//
///////////////////////////////////////////////////////////////////////////////
// add dashed lines!
// from http://davidowens.wordpress.com/2010/09/07/html-5-canvas-and-dashed-lines/
CanvasRenderingContext2D.prototype.dashedLineTo = function(fromX, fromY, toX, toY, pattern) {
// Our growth rate for our line can be one of the following:
// (+,+), (+,-), (-,+), (-,-)
// Because of this, our algorithm needs to understand if the x-coord and
// y-coord should be getting smaller or larger and properly cap the values
// based on (x,y).
var lt = function (a, b) { return a <= b; };
var gt = function (a, b) { return a >= b; };
var capmin = function (a, b) { return Math.min(a, b); };
var capmax = function (a, b) { return Math.max(a, b); };
var checkX = { thereYet: gt, cap: capmin };
var checkY = { thereYet: gt, cap: capmin };
if (fromY - toY > 0) {
checkY.thereYet = lt;
checkY.cap = capmax;
}
if (fromX - toX > 0) {
checkX.thereYet = lt;
checkX.cap = capmax;
}
this.moveTo(fromX, fromY);
var offsetX = fromX;
var offsetY = fromY;
var idx = 0, dash = true;
while (!(checkX.thereYet(offsetX, toX) && checkY.thereYet(offsetY, toY))) {
var ang = Math.atan2(toY - fromY, toX - fromX);
var len = pattern[idx];
offsetX = checkX.cap(toX, offsetX + (Math.cos(ang) * len));
offsetY = checkY.cap(toY, offsetY + (Math.sin(ang) * len));
if (dash) this.lineTo(offsetX, offsetY);
else this.moveTo(offsetX, offsetY);
idx = (idx + 1) % pattern.length;
dash = !dash;
}
};
// given a range of values, return a new range [vmin',vmax'] where the limits
// have been chosen "nicely". Taken from matplotlib.ticker.LinearLocator
function view_limits(vmin,vmax) {
// deal with degenerate case...
if (vmin == vmax) {
if (vmin == 0) { vmin = -0.5; vmax = 0.5; }
else {
vmin = vmin > 0 ? 0.9*vmin : 1.1*vmin;
vmax = vmax > 0 ? 1.1*vmax : 0.9*vmax;
}
}
var log_range = Math.log(vmax - vmin)/Math.LN10;
var exponent = Math.floor(log_range);
//if (log_range - exponent < 0.5) exponent -= 1;
var scale = Math.pow(10,-exponent);
vmin = Math.floor(scale*vmin)/scale;
vmax = Math.ceil(scale*vmax)/scale;
return [vmin,vmax,1.0/scale];
}
function engineering_notation(n,nplaces,trim) {
if (n == 0) return("0");
if (trim == undefined) trim = true;
var sign = n < 0 ? -1 : 1;
var log10 = Math.log(sign*n)/Math.LN10;
var exp = Math.floor(log10/3); // powers of 1000
var mantissa = sign*Math.pow(10,log10 - 3*exp);
// keep specified number of places following decimal point
var mstring = (mantissa + sign*0.5*Math.pow(10,-nplaces)).toString();
var mlen = mstring.length;
var endindex = mstring.indexOf('.');
if (endindex != -1) {
if (nplaces > 0) {
endindex += nplaces + 1;
if (endindex > mlen) endindex = mlen;
if (trim) {
while (mstring.charAt(endindex-1) == '0') endindex -= 1;
if (mstring.charAt(endindex-1) == '.') endindex -= 1;
}
}
if (endindex < mlen)
mstring = mstring.substring(0,endindex);
}
switch(exp) {
case -5: return mstring+"f";
case -4: return mstring+"p";
case -3: return mstring+"n";
case -2: return mstring+"u";
case -1: return mstring+"m";
case 0: return mstring;
case 1: return mstring+"K";
case 2: return mstring+"M";
case 3: return mstring+"G";
}
// don't have a good suffix, so just print the number
return n.toString();
}
var grid_pattern = [1,2];
var cursor_pattern = [5,5];
// x_values is an array of x coordinates for each of the plots
// y_values is an array of [color, value_array], one entry for each plot
Schematic.prototype.graph = function(x_values,y_values,x_legend,y_legend) {
var pwidth = 400; // dimensions of actual plot
var pheight = 300; // dimensions of actual plot
var left_margin = 55;
var top_margin = 25;
var right_margin = 25;
var bottom_margin = 45;
var tick_length = 5;
var w = pwidth + left_margin + right_margin;
var h = pheight + top_margin + bottom_margin;
var canvas = document.createElement('canvas');
canvas.width = w;
canvas.height = h;
// the graph itself will be drawn here and this image will be copied
// onto canvas, where it can be overlayed with mouse cursors, etc.
var bg_image = document.createElement('canvas');
bg_image.width = w;
bg_image.height = h;
canvas.bg_image = bg_image; // so we can find it during event handling
// start by painting an opaque background
var c = bg_image.getContext('2d');
c.fillStyle = background_style;
c.fillRect(0,0,w,h);
c.fillStyle = element_style;
c.fillRect(left_margin,top_margin,pwidth,pheight);
// figure out scaling for plots
var x_min = array_min(x_values);
var x_max = array_max(x_values);
var x_limits = view_limits(x_min,x_max);
x_min = x_limits[0];
x_max = x_limits[1];
var x_scale = pwidth/(x_max - x_min);
function plot_x(x) {
return (x - x_min)*x_scale + left_margin;
}
// draw x grid
c.strokeStyle = grid_style;
c.lineWidth = 1;
c.fillStyle = normal_style;
c.font = '10pt sans-serif';
c.textAlign = 'center';
c.textBaseline = 'top';
var end = top_margin + pheight;
for (var x = x_min; x <= x_max; x += x_limits[2]) {
var temp = plot_x(x) + 0.5; // keep lines crisp!
// grid line
c.beginPath();
if (x == x_min) {
c.moveTo(temp,top_margin);
c.lineTo(temp,end);
} else
c.dashedLineTo(temp,top_margin,temp,end,grid_pattern);
c.stroke();
// tick mark
c.beginPath();
c.moveTo(temp,end);
c.lineTo(temp,end + tick_length);
c.stroke();
c.fillText(engineering_notation(x,2),temp,end + tick_length);
}
var y_min = Infinity;
var y_max = -Infinity;
var plot;
for (plot = y_values.length - 1; plot >= 0; --plot) {
var values = y_values[plot][1];
var temp = array_min(values);
if (temp < y_min) y_min = temp;
temp = array_max(values);
if (temp > y_max) y_max = temp;
}
var y_limits = view_limits(y_min,y_max);
y_min = y_limits[0];
y_max = y_limits[1];
var y_scale = pheight/(y_max - y_min);
function plot_y(y) {
return (y_max - y)*y_scale + top_margin;
}
// draw y grid
c.textAlign = 'right';
c.textBaseline = 'middle';
for (var y = y_min; y <= y_max; y += y_limits[2]) {
var temp = plot_y(y) + 0.5; // keep lines crisp!
// grid line
c.beginPath();
if (y == y_min) {
c.moveTo(left_margin,temp);
c.lineTo(left_margin + pwidth,temp);
} else
c.dashedLineTo(left_margin,temp,left_margin + pwidth,temp,grid_pattern);
c.stroke();
// tick mark
c.beginPath();
c.moveTo(left_margin - tick_length,temp);
c.lineTo(left_margin,temp);
c.stroke();
c.fillText(engineering_notation(y,2),left_margin - tick_length -2,temp);
}
// now draw each plot
var x,y;
c.lineWidth = 3;
for (plot = y_values.length - 1; plot >= 0; --plot) {
c.strokeStyle = probe_colors_rgb[y_values[plot][0]];
var values = y_values[plot][1];
c.beginPath();
x = plot_x(x_values[0]);
y = plot_y(values[0]);
c.moveTo(x,y);
for (var i = 1; i < x_values.length; i++) {
x = plot_x(x_values[i]);
y = plot_y(values[i]);
c.lineTo(x,y);
}
c.stroke();
}
// draw legends
c.font = '12pt sans-serif';
c.textAlign = 'center';
c.textBaseline = 'bottom';
c.fillText(x_legend,left_margin + pwidth/2,h - 5);
c.textBaseline = 'top';
c.save();
c.translate(5 ,top_margin + pheight/2);
c.rotate(-Math.PI/2);
c.fillText(y_legend,0,0);
c.restore();
// save info need for interactions with the graph
canvas.x_values = x_values;
canvas.y_values = y_values;
canvas.x_legend = x_legend;
canvas.y_legend = y_legend;
canvas.x_min = x_min;
canvas.x_scale = x_scale;
canvas.y_min = y_min;
canvas.y_scale = y_scale;
canvas.left_margin = left_margin;
canvas.top_margin = top_margin;
canvas.pwidth = pwidth;
canvas.pheight = pheight;
canvas.tick_length = tick_length;
canvas.cursor_x = undefined;
canvas.sch = this;
// do something useful when user mouses over graph
canvas.addEventListener('mousemove',graph_mouse_move,false);
// return our masterpiece
redraw_plot(canvas);
return canvas;
}
function array_max(a) {
max = -Infinity;
for (var i = a.length - 1; i >= 0; --i)
if (a[i] > max) max = a[i];
return max;
}
function array_min(a) {
min = Infinity;
for (var i = a.length - 1; i >= 0; --i)
if (a[i] < min) min = a[i];
return min;
}
function redraw_plot(graph) {
var c = graph.getContext('2d');
c.drawImage(graph.bg_image,0,0);
if (graph.cursor_x != undefined) {
// draw dashed vertical marker that follows mouse
var x = graph.left_margin + graph.cursor_x;
var end_y = graph.top_margin + graph.pheight + graph.tick_length;
c.strokeStyle = grid_style;
c.lineWidth = 1;
c.beginPath();
c.dashedLineTo(x,graph.top_margin,x,end_y,cursor_pattern);
c.stroke();
// add x label at bottom of marker
var graph_x = graph.cursor_x/graph.x_scale + graph.x_min;
c.font = '10pt sans-serif';
c.textAlign = 'center';
c.textBaseline = 'top';
c.fillStyle = background_style;
c.fillText('\u2588\u2588\u2588\u2588\u2588',x,end_y);
c.fillStyle = normal_style;
c.fillText(engineering_notation(graph_x,3,false),x,end_y);
// compute which points marker is between
var x_values = graph.x_values;
var len = x_values.length;
var index = 0;
while (index < len && graph_x >= x_values[index]) index += 1;
var x1 = (index == 0) ? x_values[0] : x_values[index-1];
var x2 = x_values[index];
if (x2 != undefined) {
// for each plot, interpolate and output value at intersection with marker
c.textAlign = 'left';
var tx = graph.left_margin + 4;
var ty = graph.top_margin;
for (var plot = 0; plot < graph.y_values.length; plot++) {
var values = graph.y_values[plot][1];
// interpolate signal value at graph_x using values[index-1] and values[index]
var y1 = (index == 0) ? values[0] : values[index-1];
var y2 = values[index];
var y = y1;
if (graph_x != x1) y += (graph_x - x1)*(y2 - y1)/(x2 - x1);
// annotate plot with value of signal at marker
c.fillStyle = element_style;
c.fillText('\u2588\u2588\u2588\u2588\u2588',tx-3,ty);
c.fillStyle = probe_colors_rgb[graph.y_values[plot][0]];
c.fillText(engineering_notation(y,3,false),tx,ty);
ty += 14;
}
}
}
}
function graph_mouse_move(event) {
if (!event) event = window.event;
var g = (window.event) ? event.srcElement : event.target;
g.relMouseCoords(event);
// not sure yet where the 3,-3 offset correction comes from (borders? padding?)
var gx = g.mouse_x - g.left_margin - 3;
var gy = g.pheight - (g.mouse_y - g.top_margin) + 3;
if (gx >= 0 && gx <= g.pwidth && gy >=0 && gy <= g.pheight) g.cursor_x = gx;
else g.cursor_x = undefined;
redraw_plot(g);
}
///////////////////////////////////////////////////////////////////////////////
//
// Parts bin
//
////////////////////////////////////////////////////////////////////////////////
// one instance will be created for each part in the parts bin
function Part(sch) {
this.sch = sch;
this.component = undefined;
this.selected = false;
// set up canvas
this.canvas = document.createElement('canvas');
this.canvas.style.borderStyle = 'solid';
this.canvas.style.borderWidth = '1px';
this.canvas.style.borderColor = background_style;
//this.canvas.style.position = 'absolute';
this.canvas.style.cursor = 'default';
this.canvas.height = part_w;
this.canvas.width = part_h;
this.canvas.part = this;
this.canvas.addEventListener('mouseover',part_enter,false);
this.canvas.addEventListener('mouseout',part_leave,false);
this.canvas.addEventListener('mousedown',part_mouse_down,false);
this.canvas.addEventListener('mouseup',part_mouse_up,false);
// make the part "clickable" by registering a dummy click handler
// this should make things work on the iPad
this.canvas.addEventListener('click',function(){},false);
}
Part.prototype.set_location = function(left,top) {
this.canvas.style.left = left + 'px';
this.canvas.style.top = top + 'px';
}
Part.prototype.right = function() {
return this.canvas.offsetLeft + this.canvas.offsetWidth;
}
Part.prototype.bottom = function() {
return this.canvas.offsetTop + this.canvas.offsetHeight;
}
Part.prototype.set_component = function(component,tip) {
component.sch = this;
this.component = component;
this.tip = tip;
// figure out scaling and centering of parts icon
var b = component.bounding_box;
var dx = b[2] - b[0];
var dy = b[3] - b[1];
this.scale = 0.8; //Math.min(part_w/(1.2*dx),part_h/(1.2*dy));
this.origin_x = b[0] + dx/2.0 - part_w/(2.0*this.scale);
this.origin_y = b[1] + dy/2.0 - part_h/(2.0*this.scale);
this.redraw();
}
Part.prototype.redraw = function(part) {
var c = this.canvas.getContext('2d');
// paint background color
c.fillStyle = this.selected ? selected_style : background_style;
c.fillRect(0,0,part_w,part_h);
if (this.component) this.component.draw(c);
}
Part.prototype.select = function(which) {
this.selected = which;
this.redraw();
}
Part.prototype.update_connection_point = function(cp,old_location) {
// no connection points in the parts bin
}
Part.prototype.moveTo = function(c,x,y) {
c.moveTo((x - this.origin_x) * this.scale,(y - this.origin_y) * this.scale);
}
Part.prototype.lineTo = function(c,x,y) {
c.lineTo((x - this.origin_x) * this.scale,(y - this.origin_y) * this.scale);
}
Part.prototype.draw_line = function(c,x1,y1,x2,y2,width) {
c.lineWidth = width*this.scale;
c.beginPath();
c.moveTo((x1 - this.origin_x) * this.scale,(y1 - this.origin_y) * this.scale);
c.lineTo((x2 - this.origin_x) * this.scale,(y2 - this.origin_y) * this.scale);
c.stroke();
}
Part.prototype.draw_arc = function(c,x,y,radius,start_radians,end_radians,anticlockwise,width,filled) {
c.lineWidth = width*this.scale;
c.beginPath();
c.arc((x - this.origin_x)*this.scale,(y - this.origin_y)*this.scale,radius*this.scale,
start_radians,end_radians,anticlockwise);
if (filled) c.fill();
else c.stroke();
}
Part.prototype.draw_text = function(c,text,x,y,size) {
// no text displayed for the parts icon
}
function part_enter(event) {
if (!event) event = window.event;
var canvas = (window.event) ? event.srcElement : event.target;
var part = canvas.part;
// avoid Chrome bug that changes to text cursor whenever
// drag starts. We'll restore the default handler at
// the appropriate point so behavior in other parts of
// the document are unaffected.
part.sch.saved_onselectstart = document.onselectstart;
document.onselectstart = function () { return false; };
canvas.style.borderColor = normal_style;
part.sch.message(part.tip+': drag onto diagram to insert');
return false;
}
function part_leave(event) {
if (!event) event = window.event;
var canvas = (window.event) ? event.srcElement : event.target;
var part = canvas.part;
if (typeof part.sch.new_part == 'undefined') {
// leaving with no part selected? revert handler
document.onselectstart = part.sch.saved_onselectstart;
}
canvas.style.borderColor = background_style;
part.sch.message('');
return false;
}
function part_mouse_down(event) {
if (!event) event = window.event;
var part = (window.event) ? event.srcElement.part : event.target.part;
part.select(true);
part.sch.new_part = part;
return false;
}
function part_mouse_up(event) {
if (!event) event = window.event;
var part = (window.event) ? event.srcElement.part : event.target.part;
part.select(false);
part.sch.new_part = undefined;
return false;
}
////////////////////////////////////////////////////////////////////////////////
//
// Rectangle helper functions
//
////////////////////////////////////////////////////////////////////////////////
// rect is an array of the form [left,top,right,bottom]
// ensure left < right, top < bottom
function canonicalize(r) {
var temp;
// canonicalize bounding box
if (r[0] > r[2]) {
temp = r[0];
r[0] = r[2];
r[2] = temp;
}
if (r[1] > r[3]) {
temp = r[1];
r[1] = r[3];
r[3] = temp;
}
}
function between(x,x1,x2) {
return x1 <= x && x <= x2;
}
function inside(rect,x,y) {
return between(x,rect[0],rect[2]) && between(y,rect[1],rect[3]);
}
// only works for manhattan rectangles
function intersect(r1,r2) {
// look for non-intersection, negate result
var result = !(r2[0] > r1[2] ||
r2[2] < r1[0] ||
r2[1] > r1[3] ||
r2[3] < r1[1]);
// if I try to return the above expression, javascript returns undefined!!!
return result;
}
////////////////////////////////////////////////////////////////////////////////
//
// Component base class
//
////////////////////////////////////////////////////////////////////////////////
function Component(type,x,y,rotation) {
this.sch = undefined;
this.type = type;
this.x = x;
this.y = y;
this.rotation = rotation;
this.selected = false;
this.properties = new Array();
this.bounding_box = [0,0,0,0]; // in device coords [left,top,right,bottom]
this.bbox = this.bounding_box; // in absolute coords
this.connections = [];
}
Component.prototype.json = function(index) {
this.properties['_json_'] = index; // remember where we are in the JSON list
var props = {};
for (var p in this.properties) props[p] = this.properties[p];
var conns = [];
for (var i = 0; i < this.connections.length; i++)
conns.push(this.connections[i].json());
var json = [this.type,[this.x, this.y, this.rotation],props,conns];
return json;
}
Component.prototype.add_connection = function(offset_x,offset_y) {
this.connections.push(new ConnectionPoint(this,offset_x,offset_y));
}
Component.prototype.update_coords = function() {
var x = this.x;
var y = this.y;
// update bbox
var b = this.bounding_box;
this.bbox[0] = this.transform_x(b[0],b[1]) + x;
this.bbox[1] = this.transform_y(b[0],b[1]) + y;
this.bbox[2] = this.transform_x(b[2],b[3]) + x;
this.bbox[3] = this.transform_y(b[2],b[3]) + y;
canonicalize(this.bbox);
// update connections
for (var i = this.connections.length - 1; i >= 0; --i)
this.connections[i].update_location();
}
Component.prototype.rotate = function(amount) {
var old_rotation = this.rotation;
this.rotation = (this.rotation + amount) % 8;
this.update_coords();
// create an undoable edit record here
// using old_rotation
}
Component.prototype.move_begin = function() {
// remember where we started this move
this.move_x = this.x;
this.move_y = this.y;
}
Component.prototype.move = function(dx,dy) {
// update coordinates
this.x += dx;
this.y += dy;
this.update_coords();
}
Component.prototype.move_end = function() {
var dx = this.x - this.move_x;
var dy = this.y - this.move_y;
if (dx != 0 || dy != 0) {
// create an undoable edit record here
this.sch.check_wires(this);
}
}
Component.prototype.add = function(sch) {
this.sch = sch; // we now belong to a schematic!
sch.add_component(this);
this.update_coords();
}
Component.prototype.delete = function() {
// remove connection points from schematic
for (var i = this.connections.length - 1; i >= 0; --i) {
var cp = this.connections[i];
this.sch.remove_connection_point(cp,cp.location);
}
// remove component from schematic
this.sch.remove_component(this);
this.sch = undefined;
// create an undoable edit record here
}
Component.prototype.transform_x = function(x,y) {
var rot = this.rotation;
if (rot == 0 || rot == 6) return x;
else if (rot == 1 || rot == 5) return -y;
else if (rot == 2 || rot == 4) return -x;
else return y;
}
Component.prototype.transform_y = function(x,y) {
var rot = this.rotation;
if (rot == 1 || rot == 7) return x;
else if (rot == 2 || rot == 6) return -y;
else if (rot == 3 || rot == 5) return -x;
else return y;
}
Component.prototype.moveTo = function(c,x,y) {
var nx = this.transform_x(x,y) + this.x;
var ny = this.transform_y(x,y) + this.y;
this.sch.moveTo(c,nx,ny);
}
Component.prototype.lineTo = function(c,x,y) {
var nx = this.transform_x(x,y) + this.x;
var ny = this.transform_y(x,y) + this.y;
this.sch.lineTo(c,nx,ny);
}
Component.prototype.draw_line = function(c,x1,y1,x2,y2) {
c.strokeStyle = this.selected ? selected_style : normal_style;
var nx1 = this.transform_x(x1,y1) + this.x;
var ny1 = this.transform_y(x1,y1) + this.y;
var nx2 = this.transform_x(x2,y2) + this.x;
var ny2 = this.transform_y(x2,y2) + this.y;
this.sch.draw_line(c,nx1,ny1,nx2,ny2,1);
}
Component.prototype.draw_circle = function(c,x,y,radius,filled) {
if (filled) c.fillStyle = this.selected ? selected_style : normal_style;
else c.strokeStyle = this.selected ? selected_style : normal_style;
var nx = this.transform_x(x,y) + this.x;
var ny = this.transform_y(x,y) + this.y;
this.sch.draw_arc(c,nx,ny,radius,0,2*Math.PI,false,1,filled);
}
rot_angle = [
0.0, // NORTH (identity)
Math.PI/2, // EAST (rot270)
Math.PI, // SOUTH (rot180)
3*Math.PI/2, // WEST (rot90)
0.0, // RNORTH (negy)
Math.PI/2, // REAST (int-neg)
Math.PI, // RSOUTH (negx)
3*Math.PI/2, // RWEST (int-pos)
];
Component.prototype.draw_arc = function(c,x,y,radius,start_radians,end_radians) {
c.strokeStyle = this.selected ? selected_style : normal_style;
var nx = this.transform_x(x,y) + this.x;
var ny = this.transform_y(x,y) + this.y;
this.sch.draw_arc(c,nx,ny,radius,
start_radians+rot_angle[this.rotation],end_radians+rot_angle[this.rotation],
false,1,false);
}
Component.prototype.draw = function(c) {
}
// result of rotating an alignment [rot*9 + align]
aOrient = [
0, 1, 2, 3, 4, 5, 6, 7, 8, // NORTH (identity)
2, 5, 8, 1, 4, 7, 0, 3, 6, // EAST (rot270)
8, 7, 6, 5, 4, 3, 2, 1, 0, // SOUTH (rot180)
6, 3, 0, 7, 4, 1, 8, 5, 3, // WEST (rot90)
2, 1, 0, 5, 4, 3, 8, 7, 6, // RNORTH (negy)
8, 5, 2, 7, 4, 1, 6, 3, 0, // REAST (int-neg)
6, 7, 8, 3, 4, 5, 0, 1, 2, // RSOUTH (negx)
0, 3, 6, 1, 4, 7, 2, 5, 8 // RWEST (int-pos)
];
textAlign = [
'left', 'center', 'right',
'left', 'center', 'right',
'left', 'center', 'right'
];
textBaseline = [
'top', 'top', 'top',
'middle', 'middle', 'middle',
'bottom', 'bottom', 'bottom'
];
Component.prototype.draw_text = function(c,text,x,y,alignment,size,fill) {
var a = aOrient[this.rotation*9 + alignment];
c.textAlign = textAlign[a];
c.textBaseline = textBaseline[a];
if (fill == undefined)
c.fillStyle = this.selected ? selected_style : normal_style;
else
c.fillStyle = fill;
this.sch.draw_text(c,text,
this.transform_x(x,y) + this.x,
this.transform_y(x,y) + this.y,
size);
}
Component.prototype.set_select = function(which) {
if (which != this.selected) {
this.selected = which;
// create an undoable edit record here
}
}
Component.prototype.select = function(x,y,shiftKey) {
this.was_previously_selected = this.selected;
if (this.near(x,y)) {
this.set_select(shiftKey ? !this.selected : true);
return true;
} else return false;
}
Component.prototype.select_rect = function(s) {
this.was_previously_selected = this.selected;
if (intersect(this.bbox,s))
this.set_select(true);
}
// if connection point of component c bisects the
// wire represented by this compononent, return that
// connection point. Otherwise return null.
Component.prototype.bisect = function(c) {
return null;
}
// does mouse click fall on this component?
Component.prototype.near = function(x,y) {
return inside(this.bbox,x,y);
}
Component.prototype.edit_properties = function(x,y) {
if (this.near(x,y)) {
// make an <input> widget for each property
var fields = new Array();
for (var i in this.properties)
// underscore at beginning of property name => system property
if (i.charAt(0) != '_')
fields[i] = build_input('text',10,this.properties[i]);
var content = build_table(fields);
content.fields = fields;
content.component = this;
this.sch.dialog('Edit Properties',content,function(content) {
for (var i in content.fields)
content.component.properties[i] = content.fields[i].value;
content.component.sch.redraw_background();
});
return true;
} else return false;
}
// clear the labels on all connections
Component.prototype.clear_labels = function() {
for (var i = this.connections.length - 1; i >=0; --i) {
this.connections[i].clear_label();
}
}
// default action: don't propagate label
Component.prototype.propagate_label = function(label) {
}
// give components a chance to generate default labels for their connection(s)
// default action: do nothing
Component.prototype.add_default_labels = function() {
}
// component should generate labels for all unlabeled connections
Component.prototype.label_connections = function() {
for (var i = this.connections.length - 1; i >=0; --i) {
var cp = this.connections[i];
if (!cp.label)
cp.propagate_label(this.sch.get_next_label());
}
}
// default behavior: nothing to display for DC analysis
Component.prototype.display_current = function(c,vmap) {
}
////////////////////////////////////////////////////////////////////////////////
//
// Connection point
//
////////////////////////////////////////////////////////////////////////////////
connection_point_radius = 2;
function ConnectionPoint(parent,x,y) {
this.parent = parent;
this.offset_x = x;
this.offset_y = y;
this.location = '';
this.update_location();
this.label = undefined;
}
ConnectionPoint.prototype.toString = function() {
return '<ConnectionPoint ('+this.offset_x+','+this.offset_y+') '+this.parent.toString()+'>';
}
ConnectionPoint.prototype.json = function() {
return this.label;
}
ConnectionPoint.prototype.clear_label = function() {
this.label = undefined;
}
ConnectionPoint.prototype.propagate_label = function(label) {
// should we check if existing label is the same? it should be...
if (this.label === undefined) {
// label this connection point
this.label = label;
// propagate label to coincident connection points
this.parent.sch.propagate_label(label,this.location);
// possibly label other cp's for this device?
this.parent.propagate_label(label);
}
}
ConnectionPoint.prototype.update_location = function() {
// update location string which we use as a key to find coincident connection points
var old_location = this.location;
var parent = this.parent;
var nx = parent.transform_x(this.offset_x,this.offset_y) + parent.x;
var ny = parent.transform_y(this.offset_x,this.offset_y) + parent.y;
this.x = nx;
this.y = ny;
this.location = nx + ',' + ny;
// add ourselves to the connection list for the new location
if (parent.sch)
parent.sch.update_connection_point(this,old_location);
}
ConnectionPoint.prototype.coincident = function(x,y) {
return this.x==x && this.y==y;
}
ConnectionPoint.prototype.draw = function(c,n) {
if (n != 2)
this.parent.draw_circle(c,this.offset_x,this.offset_y,connection_point_radius,n > 2);
}
ConnectionPoint.prototype.display_voltage = function(c,vmap) {
var v = vmap[this.label];
if (v != undefined) {
var label = v.toFixed(2) + 'V';
// first draw some solid blocks in the background
c.globalAlpha = 0.85;
this.parent.draw_text(c,'\u2588\u2588\u2588',this.offset_x,this.offset_y,
4,annotation_size,element_style);
c.globalAlpha = 1.0;
// display the node voltage at this connection point
this.parent.draw_text(c,label,this.offset_x,this.offset_y,
4,annotation_size,annotation_style);
// only display each node voltage once
delete vmap[this.label];
}
}
////////////////////////////////////////////////////////////////////////////////
//
// Wire
//
////////////////////////////////////////////////////////////////////////////////
near_distance = 2; // how close to wire counts as "near by"
function Wire(x1,y1,x2,y2) {
// arbitrarily call x1,y1 the origin
Component.call(this,'w',x1,y1,0);
this.dx = x2 - x1;
this.dy = y2 - y1;
this.add_connection(0,0);
this.add_connection(this.dx,this.dy);
// compute bounding box (expanded slightly)
var r = [0,0,this.dx,this.dy];
canonicalize(r);
r[0] -= near_distance;
r[1] -= near_distance;
r[2] += near_distance;
r[3] += near_distance;
this.bounding_box = r;
this.update_coords(); // update bbox
// used in selection calculations
this.len = Math.sqrt(this.dx*this.dx + this.dy*this.dy);
}
Wire.prototype = new Component();
Wire.prototype.constructor = Wire;
Wire.prototype.toString = function() {
return '<Wire ('+this.x+','+this.y+') ('+(this.x+this.dx)+','+(this.y+this.dy)+')>';
}
Wire.prototype.json = function(index) {
var json = ['w',[this.x, this.y, this.x+this.dx, this.y+this.dy]];
return json;
}
Wire.prototype.draw = function(c) {
this.draw_line(c,0,0,this.dx,this.dy);
}
Wire.prototype.clone = function(x,y) {
return new Wire(x,y,x+this.dx,y+this.dy);
}
Wire.prototype.near = function(x,y) {
// crude check: (x,y) within expanded bounding box of wire
if (inside(this.bbox,x,y)) {
// compute distance between x,y and nearst point on line
// http://www.allegro.cc/forums/thread/589720
var D = Math.abs((x - this.x)*this.dy - (y - this.y)*this.dx)/this.len;
if (D <= near_distance) return true;
}
return false;
}
// selection rectangle selects wire only if it includes
// one of the end points
Wire.prototype.select_rect = function(s) {
this.was_previously_selected = this.selected;
if (inside(s,this.x,this.y) || inside(s,this.x+this.dx,this.y+this.dy))
this.set_select(true);
}
// if connection point of component c bisects the
// wire represented by this compononent, return that
// connection point. Otherwise return null.
Wire.prototype.bisect = function(c) {
for (var i = c.connections.length - 1; i >= 0; --i) {
var cp = c.connections[i];
var x = cp.x;
var y = cp.y;
// crude check: (x,y) within expanded bounding box of wire
if (inside(this.bbox,x,y)) {
// compute distance between x,y and nearst point on line
// http://www.allegro.cc/forums/thread/589720
var D = Math.abs((x - this.x)*this.dy - (y - this.y)*this.dx)/this.len;
// final check: ensure point isn't an end point of the wire
if (D < 1 && !this.connections[0].coincident(x,y) && !this.connections[1].coincident(x,y))
return cp;
}
}
return null;
}
Wire.prototype.move_end = function() {
this.sch.check_wires(this);
}
// wires "conduct" their label to the other end
Wire.prototype.propagate_label = function(label) {
// don't worry about relabeling a cp, it won't recurse!
this.connections[0].propagate_label(label);
this.connections[1].propagate_label(label);
}
// some actual component will start the labeling of electrical nodes,
// so do nothing here
Wire.prototype.label_connections = function() {
}
////////////////////////////////////////////////////////////////////////////////
//
// Ground
//
////////////////////////////////////////////////////////////////////////////////
function Ground(x,y,rotation) {
Component.call(this,'g',x,y,rotation);
this.add_connection(0,0);
this.bounding_box = [-6,0,6,8];
this.update_coords();
}
Ground.prototype = new Component();
Ground.prototype.constructor = Ground;
Ground.prototype.toString = function() {
return '<Ground ('+this.x+','+this.y+')>';
}
Ground.prototype.draw = function(c) {
this.draw_line(c,0,0,0,8);
this.draw_line(c,-6,8,6,8);
}
Ground.prototype.clone = function(x,y) {
return new Ground(x,y,this.rotation);
}
// give components a chance to generate a label for their connection(s)
// default action: do nothing
Ground.prototype.add_default_labels = function() {
this.connections[0].propagate_label('0'); // canonical label for GND node
}
////////////////////////////////////////////////////////////////////////////////
//
// Label
//
////////////////////////////////////////////////////////////////////////////////
function Label(x,y,rotation,label) {
Component.call(this,'L',x,y,rotation);
this.properties['label'] = label ? label : '???';
this.add_connection(0,0);
this.bounding_box = [-2,0,2,8];
this.update_coords();
}
Label.prototype = new Component();
Label.prototype.constructor = Label;
Label.prototype.toString = function() {
return '<Label'+' ('+this.x+','+this.y+')>';
}
Label.prototype.draw = function(c) {
this.draw_line(c,0,0,0,8);
this.draw_text(c,this.properties['label'],0,9,1,property_size);
}
Label.prototype.clone = function(x,y) {
return new Label(x,y,this.rotation,this.properties['label']);
}
// give components a chance to generate a label for their connection(s)
// default action: do nothing
Label.prototype.add_default_labels = function() {
this.connections[0].propagate_label(this.properties['label']);
}
////////////////////////////////////////////////////////////////////////////////
//
// Scope Probe
//
////////////////////////////////////////////////////////////////////////////////
probe_colors = ['red','green','blue','cyan','magenta','black'];
probe_colors_rgb = {
'red': 'rgb(255,64,64)',
'green': 'rgb(64,255,64)',
'blue': 'rgb(64,64,255)',
'cyan': 'rgb(64,255,255)',
'magenta' : 'rgb(255,64,255)',
'black': 'rgb(0,0,0)',
};
function Probe(x,y,rotation,color) {
Component.call(this,'s',x,y,rotation);
this.add_connection(0,0);
this.properties['color'] = color ? color : 'cyan';
this.bounding_box = [0,0,27,-21];
this.update_coords();
}
Probe.prototype = new Component();
Probe.prototype.constructor = Probe;
Probe.prototype.toString = function() {
return '<Probe ('+this.x+','+this.y+')>';
}
Probe.prototype.draw = function(c) {
// draw outline
this.draw_line(c,0,0,4,-4);
this.draw_line(c,2,-6,6,-2);
this.draw_line(c,2,-6,17,-21);
this.draw_line(c,6,-2,21,-17);
this.draw_line(c,17,-21,21,-17);
this.draw_arc(c,19,-11,8,3*Math.PI/2,0);
// fill body with plot color
c.fillStyle = probe_colors_rgb[this.properties['color']];
c.beginPath();
this.moveTo(c,2,-6)
this.lineTo(c,6,-2);
this.lineTo(c,21,-17);
this.lineTo(c,17,-21);
this.lineTo(c,2,-6);
c.fill();
}
Probe.prototype.clone = function(x,y) {
return new Probe(x,y,this.rotation,this.properties['color']);
}
Probe.prototype.edit_properties = function(x,y) {
if (inside(this.bbox,x,y)) {
var fields = new Array();
fields['Plot color'] = build_select(probe_colors,this.properties['color']);
var content = build_table(fields);
content.fields = fields;
content.component = this;
this.sch.dialog('Edit Properties',content,function(content) {
var color_choice = content.fields['Plot color'];
content.component.properties['color'] = probe_colors[color_choice.selectedIndex];
content.component.sch.redraw_background();
});
return true;
} else return false;
}
// return [color, node_label] for this probe
Probe.prototype.probe_info = function() {
return [this.properties['color'],this.connections[0].label];
}
////////////////////////////////////////////////////////////////////////////////
//
// Resistor
//
////////////////////////////////////////////////////////////////////////////////
function Resistor(x,y,rotation,name,r) {
Component.call(this,'r',x,y,rotation);
this.properties['name'] = name;
this.properties['r'] = r ? r : '1';
this.add_connection(0,0);
this.add_connection(0,48);
this.bounding_box = [-5,0,5,48];
this.update_coords();
}
Resistor.prototype = new Component();
Resistor.prototype.constructor = Resistor;
Resistor.prototype.toString = function() {
return '<Resistor '+this.properties['r']+' ('+this.x+','+this.y+')>';
}
Resistor.prototype.draw = function(c) {
this.draw_line(c,0,0,0,12);
this.draw_line(c,0,12,4,14);
this.draw_line(c,4,14,-4,18);
this.draw_line(c,-4,18,4,22);
this.draw_line(c,4,22,-4,26);
this.draw_line(c,-4,26,4,30);
this.draw_line(c,4,30,-4,34);
this.draw_line(c,-4,34,0,36);
this.draw_line(c,0,36,0,48);
if (this.properties['r'])
this.draw_text(c,this.properties['r']+'\u03A9',5,24,3,property_size);
if (this.properties['name'])
this.draw_text(c,this.properties['name'],-5,24,5,property_size);
}
Resistor.prototype.clone = function(x,y) {
return new Resistor(x,y,this.rotation,this.properties['name'],this.properties['r']);
}
////////////////////////////////////////////////////////////////////////////////
//
// Capacitor
//
////////////////////////////////////////////////////////////////////////////////
function Capacitor(x,y,rotation,name,c) {
Component.call(this,'c',x,y,rotation);
this.properties['name'] = name;
this.properties['c'] = c ? c : '1p';
this.add_connection(0,0);
this.add_connection(0,48);
this.bounding_box = [-8,0,8,48];
this.update_coords();
}
Capacitor.prototype = new Component();
Capacitor.prototype.constructor = Capacitor;
Capacitor.prototype.toString = function() {
return '<Capacitor '+this.properties['r']+' ('+this.x+','+this.y+')>';
}
Capacitor.prototype.draw = function(c) {
this.draw_line(c,0,0,0,22);
this.draw_line(c,-8,22,8,22);
this.draw_line(c,-8,26,8,26);
this.draw_line(c,0,26,0,48);
if (this.properties['c'])
this.draw_text(c,this.properties['c']+'F',9,24,3,property_size);
if (this.properties['name'])
this.draw_text(c,this.properties['name'],-9,24,5,property_size);
}
Capacitor.prototype.clone = function(x,y) {
return new Capacitor(x,y,this.rotation,this.properties['name'],this.properties['c']);
}
////////////////////////////////////////////////////////////////////////////////
//
// Inductor
//
////////////////////////////////////////////////////////////////////////////////
function Inductor(x,y,rotation,name,l) {
Component.call(this,'l',x,y,rotation);
this.properties['name'] = name;
this.properties['l'] = l ? l : '1n';
this.add_connection(0,0);
this.add_connection(0,48);
this.bounding_box = [-4,0,5,48];
this.update_coords();
}
Inductor.prototype = new Component();
Inductor.prototype.constructor = Inductor;
Inductor.prototype.toString = function() {
return '<Inductor '+this.properties['l']+' ('+this.x+','+this.y+')>';
}
Inductor.prototype.draw = function(c) {
this.draw_line(c,0,0,0,14);
this.draw_arc(c,0,18,4,6*Math.PI/4,3*Math.PI/4);
this.draw_arc(c,0,24,4,5*Math.PI/4,3*Math.PI/4);
this.draw_arc(c,0,30,4,5*Math.PI/4,2*Math.PI/4);
this.draw_line(c,0,34,0,48);
if (this.properties['l'])
this.draw_text(c,this.properties['l']+'H',6,24,3,property_size);
if (this.properties['name'])
this.draw_text(c,this.properties['name'],-3,24,5,property_size);
}
Inductor.prototype.clone = function(x,y) {
return new Inductor(x,y,this.rotation,this.properties['name'],this.properties['l']);
}
////////////////////////////////////////////////////////////////////////////////
//
// Diode
//
////////////////////////////////////////////////////////////////////////////////
function Diode(x,y,rotation,name,area) {
Component.call(this,'d',x,y,rotation);
this.properties['name'] = name;
this.properties['area'] = area ? area : '1';
this.add_connection(0,0); // anode
this.add_connection(0,48); // cathode
this.bounding_box = [-8,0,8,48];
this.update_coords();
}
Diode.prototype = new Component();
Diode.prototype.constructor = Diode;
Diode.prototype.toString = function() {
return '<Diode '+this.properties['area']+' ('+this.x+','+this.y+')>';
}
Diode.prototype.draw = function(c) {
this.draw_line(c,0,0,0,16);
this.draw_line(c,-8,16,8,16);
this.draw_line(c,-8,16,0,32);
this.draw_line(c,8,16,0,32);
this.draw_line(c,-8,32,8,32);
this.draw_line(c,0,32,0,48);
if (this.properties['area'])
this.draw_text(c,this.properties['area'],10,24,3,property_size);
if (this.properties['name'])
this.draw_text(c,this.properties['name'],-10,24,5,property_size);
}
Diode.prototype.clone = function(x,y) {
return new Diode(x,y,this.rotation,this.properties['name'],this.properties['area']);
}
////////////////////////////////////////////////////////////////////////////////
//
// N-channel Mosfet
//
////////////////////////////////////////////////////////////////////////////////
function NFet(x,y,rotation,name,w_over_l) {
Component.call(this,'n',x,y,rotation);
this.properties['name'] = name;
this.properties['W/L'] = w_over_l ? w_over_l : '2';
this.add_connection(0,0); // drain
this.add_connection(-24,24); // gate
this.add_connection(0,48); // source
this.bounding_box = [-24,0,8,48];
this.update_coords();
}
NFet.prototype = new Component();
NFet.prototype.constructor = NFet;
NFet.prototype.toString = function() {
return '<NFet '+this.properties['W/L']+' ('+this.x+','+this.y+')>';
}
NFet.prototype.draw = function(c) {
this.draw_line(c,0,0,0,16);
this.draw_line(c,-8,16,0,16);
this.draw_line(c,-8,16,-8,32);
this.draw_line(c,-8,32,0,32);
this.draw_line(c,0,32,0,48);
this.draw_line(c,-24,24,-12,24);
this.draw_line(c,-12,16,-12,32);
var dim = this.properties['W/L'];
if (this.properties['name']) {
this.draw_text(c,this.properties['name'],2,22,6,property_size);
this.draw_text(c,dim,2,26,0,property_size);
} else
this.draw_text(c,dim,2,24,3,property_size);
}
NFet.prototype.clone = function(x,y) {
return new NFet(x,y,this.rotation,this.properties['name'],this.properties['W/L']);
}
////////////////////////////////////////////////////////////////////////////////
//
// P-channel Mosfet
//
////////////////////////////////////////////////////////////////////////////////
function PFet(x,y,rotation,name,w_over_l) {
Component.call(this,'p',x,y,rotation);
this.properties['name'] = name;
this.properties['W/L'] = w_over_l ? w_over_l : '2';
this.add_connection(0,0); // drain
this.add_connection(-24,24); // gate
this.add_connection(0,48); // source
this.bounding_box = [-24,0,8,48];
this.update_coords();
}
PFet.prototype = new Component();
PFet.prototype.constructor = PFet;
PFet.prototype.toString = function() {
return '<PFet '+this.properties['W/L']+' ('+this.x+','+this.y+')>';
}
PFet.prototype.draw = function(c) {
this.draw_line(c,0,0,0,16);
this.draw_line(c,-8,16,0,16);
this.draw_line(c,-8,16,-8,32);
this.draw_line(c,-8,32,0,32);
this.draw_line(c,0,32,0,48);
this.draw_line(c,-24,24,-16,24);
this.draw_circle(c,-14,24,2,false);
this.draw_line(c,-12,16,-12,32);
var dim = this.properties['W/L'];
if (this.properties['name']) {
this.draw_text(c,this.properties['name'],2,22,6,property_size);
this.draw_text(c,dim,2,26,0,property_size);
} else
this.draw_text(c,dim,2,24,3,property_size);
}
PFet.prototype.clone = function(x,y) {
return new PFet(x,y,this.rotation,this.properties['name'],this.properties['W/L']);
}
////////////////////////////////////////////////////////////////////////////////
//
// Op Amp
//
////////////////////////////////////////////////////////////////////////////////
function OpAmp(x,y,rotation,name,A) {
Component.call(this,'o',x,y,rotation);
this.properties['name'] = name;
this.properties['A'] = A ? A : '30000';
this.add_connection(0,0); // +
this.add_connection(0,16); // -
this.add_connection(48,8); // output
this.add_connection(24,32); // ground
this.bounding_box = [0,-8,48,32];
this.update_coords();
}
OpAmp.prototype = new Component();
OpAmp.prototype.constructor = OpAmp;
OpAmp.prototype.toString = function() {
return '<OpAmp'+this.properties['A']+' ('+this.x+','+this.y+')>';
}
OpAmp.prototype.draw = function(c) {
// triangle
this.draw_line(c,8,-8,8,24);
this.draw_line(c,8,-8,40,8);
this.draw_line(c,8,24,40,8);
// inputs and output
this.draw_line(c,0,0,8,0);
this.draw_line(c,0,16,8,16);
this.draw_text(c,'gnd',37,18,property_size);
this.draw_line(c,40,8,48,8);
this.draw_line(c,24,16,24,32);
// + and -
this.draw_line(c,10,0,16,0);
this.draw_line(c,13,-3,13,3);
this.draw_line(c,10,16,16,16);
if (this.properties['name'])
this.draw_text(c,this.properties['name'],32,16,0,property_size);
}
OpAmp.prototype.clone = function(x,y) {
return new OpAmp(x,y,this.rotation,this.properties['name'],this.properties['A']);
}
////////////////////////////////////////////////////////////////////////////////
//
// Source
//
////////////////////////////////////////////////////////////////////////////////
function Source(x,y,rotation,name,type,value) {
Component.call(this,type,x,y,rotation);
this.properties['name'] = name;
if (value == undefined) value = 'dc(1)';
this.properties['value'] = value;
this.add_connection(0,0);
this.add_connection(0,48);
this.bounding_box = [-12,0,12,48];
this.update_coords();
this.content = document.createElement('div'); // used by edit_properties
}
Source.prototype = new Component();
Source.prototype.constructor = Source;
Source.prototype.toString = function() {
return '<'+this.type+'source '+this.properties['params']+' ('+this.x+','+this.y+')>';
}
Source.prototype.draw = function(c) {
this.draw_line(c,0,0,0,12);
this.draw_circle(c,0,24,12,false);
this.draw_line(c,0,36,0,48);
if (this.type == 'v') { // voltage source
//this.draw_text(c,'+',0,12,1,property_size);
//this.draw_text(c,'\u2013',0,36,7,property_size); // minus sign
// draw + and -
this.draw_line(c,0,15,0,21);
this.draw_line(c,-3,18,3,18);
this.draw_line(c,-3,30,3,30);
// draw V
//this.draw_line(c,-3,20,0,28);
//this.draw_line(c,3,20,0,28);
} else if (this.type == 'i') { // current source
// draw arrow: pos to neg
this.draw_line(c,0,15,0,32);
this.draw_line(c,-3,26,0,32);
this.draw_line(c,3,26,0,32);
}
if (this.properties['name'])
this.draw_text(c,this.properties['name'],-13,24,5,property_size);
if (this.properties['value'])
this.draw_text(c,this.properties['value'],13,24,3,property_size);
}
// map source function name to labels for each source parameter
source_functions = {
'dc': ['DC value'],
'impulse': ['Height',
'Width (secs)'],
'step': ['Initial value',
'Plateau value',
'Delay until step (secs)',
'Rise time (secs)'],
'square': ['Initial value',
'Plateau value',
'Frequency (Hz)'],
'triangle': ['Initial value',
'Plateau value',
'Frequency (Hz)'],
'pwl': ['Comma-separated list of alternating times and values'],
'pwl_repeating': ['Comma-separated list of alternating times and values'],
'pulse': ['Initial value',
'Plateau value',
'Delay until pulse (secs)',
'Time for first transition (secs)',
'Time for second transition (secs)',
'Pulse width (secs)',
'Period (secs)'],
'sin': ['Offset value',
'Amplitude',
'Frequency (Hz)',
'Delay until sin starts (secs)',
'Phase offset (degrees)'],
}
// build property editor div
Source.prototype.build_content = function(src) {
// make an <input> widget for each property
var fields = []
fields['name'] = build_input('text',10,this.properties['name']);
if (src == undefined) {
fields['value'] = this.properties['value'];
} else {
// fancy version: add select tag for source type
var src_types = [];
for (var t in source_functions) src_types.push(t);
var type_select = build_select(src_types,src.fun);
type_select.component = this;
type_select.addEventListener('change',source_type_changed,false)
fields['type'] = type_select;
if (src.fun == 'pwl' || src.run == 'pwl_repeating') {
var v = '';
var first = true;
for (var i = 0; i < src.args.length; i++) {
if (first) first = false;
else v += ',';
v += engineering_notation(src.args[i],3);
if (i % 2 == 0) v += 's';
}
fields[source_functions[src.fun][0]] = build_input('text',30,v);
} else {
// followed separate input tag for each parameter
var labels = source_functions[src.fun];
for (var i = 0; i < labels.length; i++) {
var v = engineering_notation(src.args[i],3);
fields[labels[i]] = build_input('text',10,v);
}
}
}
var div = this.content;
if (div.hasChildNodes())
div.removeChild(div.firstChild); // remove table of input fields
div.appendChild(build_table(fields));
div.fields = fields;
div.component = this;
return div;
}
function source_type_changed(event) {
if (!event) event = window.event;
var select = (window.event) ? event.srcElement : event.target;
// see where to get source parameters from
var type = select.options[select.selectedIndex].value;
var src = undefined;
if (this.src != undefined && type == this.src.fun)
src = this.src;
else if (typeof cktsim != 'undefined')
src = cktsim.parse_source(type+'()');
select.component.build_content(src);
}
Source.prototype.edit_properties = function(x,y) {
if (this.near(x,y)) {
this.src = undefined;
if (typeof cktsim != 'undefined')
this.src = cktsim.parse_source(this.properties['value']);
var content = this.build_content(this.src);
this.sch.dialog('Edit Properties',content,function(content) {
var c = content.component;
var fields = content.fields;
var first = true;
var value = '';
for (var label in fields) {
if (label == 'name')
c.properties['name'] = fields['name'].value;
else if (label == 'value') {
// if unknown source type
value = fields['value'].value;
c.sch.redraw_background();
return;
} else if (label == 'type') {
var select = fields['type'];
value = select.options[select.selectedIndex].value + '(';
} else {
if (first) first = false;
else value += ',';
value += fields[label].value;
}
}
c.properties['value'] = value + ')';
c.sch.redraw_background();
});
return true;
} else return false;
}
function VSource(x,y,rotation,name,value) {
Source.call(this,x,y,rotation,name,'v',value);
this.type = 'v';
}
VSource.prototype = new Component();
VSource.prototype.constructor = VSource;
VSource.prototype.toString = Source.prototype.toString;
VSource.prototype.draw = Source.prototype.draw;
VSource.prototype.clone = Source.prototype.clone;
VSource.prototype.build_content = Source.prototype.build_content;
VSource.prototype.edit_properties = Source.prototype.edit_properties;
// display current for DC analysis
VSource.prototype.display_current = function(c,vmap) {
var name = this.properties['name'];
var label = 'I(' + (name ? name : '_' + this.properties['_json_']) + ')';
var v = vmap[label];
if (v != undefined) {
// first draw some solid blocks in the background
c.globalAlpha = 0.5;
this.draw_text(c,'\u2588\u2588\u2588',-8,8,4,annotation_size,element_style);
c.globalAlpha = 1.0;
// display the element current
var i = engineering_notation(v,2) + 'A';
this.draw_text(c,i,-3,5,5,annotation_size,annotation_style);
// draw arrow for current
this.draw_line(c,-3,4,0,8);
this.draw_line(c,3,4,0,8);
// only display each current once
delete vmap[label];
}
}
VSource.prototype.clone = function(x,y) {
return new VSource(x,y,this.rotation,this.properties['name'],this.properties['value']);
}
function ISource(x,y,rotation,name,value) {
Source.call(this,x,y,rotation,name,'i',value);
this.type = 'i';
}
ISource.prototype = new Component();
ISource.prototype.constructor = ISource;
ISource.prototype.toString = Source.prototype.toString;
ISource.prototype.draw = Source.prototype.draw;
ISource.prototype.clone = Source.prototype.clone;
ISource.prototype.build_content = Source.prototype.build_content;
ISource.prototype.edit_properties = Source.prototype.edit_properties;
ISource.prototype.clone = function(x,y) {
return new ISource(x,y,this.rotation,this.properties['name'],this.properties['value']);
}
///////////////////////////////////////////////////////////////////////////////
//
// JQuery slider support for setting a component value
//
///////////////////////////////////////////////////////////////////////////////
function component_slider(event,ui) {
var sname = $(this).slider("option","schematic");
// set value of specified component
var cname = $(this).slider("option","component");
var pname = $(this).slider("option","property");
var suffix = $(this).slider("option","suffix");
if (typeof suffix != "string") suffix = "";
var v = ui.value;
$(this).slider("value",v); // move slider's indicator
var choices = $(this).slider("option","choices");
if (choices instanceof Array) v = choices[v];
// selector may match several schematics
$("." + sname).each(function(index,element) {
element.schematic.set_property(cname,pname,v.toString() + suffix);
})
// perform requested analysis
var analysis = $(this).slider("option","analysis");
if (analysis == "dc")
$("." + sname).each(function(index,element) {
element.schematic.dc_analysis();
})
return false;
}
///////////////////////////////////////////////////////////////////////////////
//
// Module definition
//
///////////////////////////////////////////////////////////////////////////////
var module = {
'Schematic': Schematic,
'component_slider': component_slider,
}
return module;
}());

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js/schematic.js Symbolic link
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../../data/js/schematic.js