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var t = 0;
var pp;
var Ax, Ay, fx, fy, dx, dy, basepx, basepy;
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;
function sinExp(A, t, f, p, d)
{
return A*sin(t*f + p) * exp(-d*t);
}
var Pendulum = function()
{
this.xy = floor(random(2));
if (this.xy === 0)
this.p = random(-PDIF, PDIF)+basepx;
else
this.p = random(-PDIF, PDIF)+basepy;
pendulums.push(this);
}
Pendulum.prototype.swing = function()
{
if (this.xy === 0)
{
var x = sinExp(Ay, t, fx, this.p, dx);
var y = 0;
}
else
{
var x = 0;
var y = sinExp(Ax, t, fy, this.p, dy);
}
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();
xsum += sw[0];
ysum += sw[1];
}
return [xsum/pendulums.length, ysum/pendulums.length];
}
function setup()
{
createCanvas(600, 600);
}
function start()
{
$("#start").prop("disabled", true);
createCanvas(800, 800);
frameRate(1000);
DMAX = parseFloat($("#DMAX").val());
var npendulums = parseInt($("#npendulums").val());
if (isNaN(DMAX) || isNaN(npendulums))
{
$("#Error").html("Please enter a valid number.");
}
basepx = random(PMAX);
basepy = random(PMAX);
Ax = random(AMAX);
Ay = random(AMAX);
fx = random(FMAX);
fy = random(FMAX);
dx = random(DMIN, DMAX);
dy = random(DMIN, DMAX);
pendulums = [];
for (var i = 0; i < npendulums; i++)
new Pendulum();
}
function saveCanvas()
{
save("AutoHarmonograph.png");
}
function draw()
{
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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