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var t = 0;
var pp;
var AMAX = 1000;
var DMIN = 0.0001;
var DMAX = 0.0003;
var FMAX = 0.1;
var PMAX = 6.28;
var ADIF = AMAX / 10;
var DDIF = DMAX / 10;
var FDIF = FMAX / 10;
var PDIF = PMAX / 10;
var npendulums = 0;
var started = false;
function sinExp(A, t, f, p, d)
{
return A*sin(t*f + p) * exp(-d*t);
}
var Pendulum = function(a, d, f, p, xy)
{
this.a = a;
this.d = d;
this.f = f;
this.p = p;
this.xy = xy;
pendulums.push(this);
}
Pendulum.prototype.swing = function()
{
//document.write(this.a + " " + t + " " + this.f + " " + this.p + " " + this.d + " " + this.xy + "<br>");
if (this.xy == 0)
{
var x = sinExp(this.a, t, this.f, this.p, this.d);
var y = 0;
}
else
{
var x = 0;
var y = sinExp(this.a, t, this.f, this.p, this.d);
}
return [x, y];
}
var pendulums = [];
function calculate()
{
var xsum = 0;
var ysum = 0;
var sw;
for (var i = 0; i < pendulums.length; i++)
{
sw = pendulums[i].swing();
//document.write(sw + "<br>");
xsum += sw[0];
ysum += sw[1];
}
return [xsum/pendulums.length, ysum/pendulums.length];
}
function addPendulum()
{
var txt = document.createElement("p");
txt.innerHTML = "Phase:";
var p = document.createElement("input");
p.type = "number";
p.value = PI;
p.id = "p" + npendulums;
txt.id = "pt" + npendulums;
document.body.appendChild(txt);
document.body.appendChild(p);
txt = document.createElement("p");
txt.innerHTML = "Amplitude:";
txt.id = "at" + npendulums;
var a = document.createElement("input");
a.type = "number";
a.value = 500;
a.id = "A" + npendulums;
document.body.appendChild(txt);
document.body.appendChild(a);
txt = document.createElement("p");
txt.innerHTML = "Damping:";
txt.id = "dt" + npendulums;
var d = document.createElement("input");
d.type = "number";
d.value = 0.0003;
d.id = "d" + npendulums;
document.body.appendChild(txt);
document.body.appendChild(d);
txt = document.createElement("p");
txt.innerHTML = "Frequency:";
var f = document.createElement("input");
f.type = "number";
f.value = 0.1;
f.id = "f" + npendulums;
txt.id = "ft" + npendulums;
document.body.appendChild(txt);
document.body.appendChild(f);
txt = document.createElement("p");
txt.innerHTML = "Is it a Y pendulum? (you should have at least one X and Y pendulum) ";
var xy = document.createElement("input");
xy.type = "checkbox";
xy.value = 1;
xy.id = "xy" + npendulums;
txt.id = "xyt" + npendulums;
document.body.appendChild(txt);
document.body.appendChild(xy);
var br = document.createElement("br");
br.id = "br" + npendulums;
document.body.appendChild(br);
txt = document.createTextNode("Delete this pendulum");
var delBtn = document.createElement("button");
delBtn.setAttribute("onclick", "deletePendulum(" + npendulums + ");");
delBtn.appendChild(txt);
delBtn.id = "db" + npendulums;
document.body.appendChild(delBtn);
npendulums++;
}
function deletePendulum(x)
{
pendulums.splice(x, 1);
document.body.removeChild(document.getElementById("p" +x));
document.body.removeChild(document.getElementById("d" +x));
document.body.removeChild(document.getElementById("f" +x));
document.body.removeChild(document.getElementById("A" +x));
document.body.removeChild(document.getElementById("xy" +x));
document.body.removeChild(document.getElementById("pt" +x));
document.body.removeChild(document.getElementById("dt" +x));
document.body.removeChild(document.getElementById("ft" +x));
document.body.removeChild(document.getElementById("at" +x));
document.body.removeChild(document.getElementById("xyt" +x));
document.body.removeChild(document.getElementById("db" +x));
document.body.removeChild(document.getElementById("br" +x));
for (var i = x+1; i < npendulums; i++)
{
document.getElementById("p"+i).id = "p"+(i-1);
document.getElementById("d"+i).id = "d"+(i-1);
document.getElementById("f"+i).id = "f"+(i-1);
document.getElementById("A"+i).id = "A"+(i-1);
document.getElementById("pt"+i).id = "pt"+(i-1);
document.getElementById("dt"+i).id = "dt"+(i-1);
document.getElementById("ft"+i).id = "ft"+(i-1);
document.getElementById("at"+i).id = "at"+(i-1);
document.getElementById("xy"+i).id = "xy"+(i-1);
document.getElementById("xyt"+i).id = "xyt"+(i-1);
document.getElementById("db"+i).id = "db"+(i-1);
document.getElementById("db"+(i-1)).setAttribute("onclick", "deletePendulum(" + (i-1) + ");");
document.getElementById("br"+i).id = "br"+(i-1);
}
npendulums--;
}
function start()
{
started = true;
createCanvas(800, 800);
frameRate(1000);
for (var i = 0; i < npendulums; i++)
{
var a = $("#A" + i).value;
var f = $("#f" + i).value;
var p = $("#p" + i).value;
var d = $("#d" + i).value;
var xy = $("#xy"+i).checked;
new Pendulum(parseFloat(a), parseFloat(d), parseFloat(f), parseFloat(p), xy);
}
}
function saveCanvas()
{
save("AutoHarmonograph.png");
}
function draw()
{
if(!started)
return;
translate(width/2, height/2);
curr = calculate();
if (t !== 0)
line(pp[0], pp[1], curr[0], curr[1]);
t++;
pp = curr;
}
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