Created pommicket.github.io

1 files changed, 107 insertions, 0 deletions

diff --git a/js/AutoHarmonograph.js b/js/AutoHarmonograph.js
new file mode 100644
index 0000000..b4158db
--- /dev/null
+++ b/js/AutoHarmonograph.js
@@ -0,0 +1,107 @@
+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()
+{
+	document.getElementById("npendulums").value = 10;
+	document.getElementById("DMAX").value = DMAX;
+}
+
+function start()
+{
+	
+	createCanvas(800, 800);
+	frameRate(1000);
+	DMAX = document.getElementById("DMAX").value;
+	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 < document.getElementById("npendulums").value; 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;
+}