Frame 1
	function Particle(px, py) {
		this.px = px;
		this.py = py;
		this.ox = px;
		this.oy = py;
	}

	function Stick(a, b, minlen, maxlen) {
		this.a = a;
		this.b = b;
		this.minl = minlen;
		this.maxl = maxlen;
		this.curl = maxlen;
	}

	function Integrate() {
		var g = GRAV;
		var d = DRAG;
		var p;
		var d1;
		var d2;
		var px;
		var py;
		for (var i in pList) {
			p = pList[i];
			d2 = d;
			d1 = d + 1;
			px = p.px;
			py = p.py;
			p.px = (d1 * px) - (d2 * p.ox);
			p.py = ((d1 * py) - (d2 * p.oy)) + g;
			p.ox = px;
			p.oy = py;
		}
	}

	function Constrain() {
		var p = pList;
		var s;
		var a;
		var b;
		var dx;
		var dy;
		var dL;
		var d;
		var l;
		for (var i in sList) {
			s = sList[i];
			a = p[s.a];
			b = p[s.b];
			dx = b.px - a.px;
			dy = b.py - a.py;
			dL = Math.sqrt((dx * dx) + (dy * dy));
			l = s.curl;
			d = (dL - l) / dL;
			dx = dx * d;
			dy = dy * d;
			a.px = a.px + (0.5 * dx);
			a.py = a.py + (0.5 * dy);
			b.px = b.px - (0.5 * dx);
			b.py = b.py - (0.5 * dy);
		}
	}

	function Collide() {
		var p;
		var x;
		var y;
		for (var i in pList) {
			p = pList[i];
			x = p.px;
			y = p.py;
			if (XMAX < x) {
				p.px = XMAX;
			} else if (x < XMIN) {
				p.px = XMIN;
			}
			if (YMAX < y) {
				var vy = (p.py - p.oy);
				p.py = YMAX;
				var vx = (p.px - p.ox);
				vx = vx * FRICTION;
				p.ox = p.px - vx;
				vy = vy * BOUNCE;
				p.oy = YMAX + vy;
			} else if (y < YMIN) {
				p.py = YMIN;
			}
		}
	}

	function Input() {
		if (Key.isDown(32)) {
			pList[0].px = _xmouse;
			pList[0].py = _ymouse;
		}
		var s;
		for (var i in sList) {
			s = sList[i];
			if (Key.isDown(keys[i])) {
				s.curl = s.curl * SHORTENSPEED;
				if (s.curlen < s.minl) {
					s.curl = s.minl;
				}
			} else {
				s.curl = s.maxl;
			}
		}
	}
	keys = new Array();
	keys[0] = 37;
	keys[1] = 40;
	keys[2] = 39;

	function Renderer() {
		this.mc = _root.createEmptyMovieClip("renderoutputMC", 100);
	}
	Renderer.prototype.Draw = function () {
		var p0 = pList[0];
		var p1 = pList[1];
		var p2 = pList[2];
		this.mc.clear();
		this.mc.lineStyle(0, 0, 100);
		this.mc.moveTo(p0.px, p0.py);
		this.mc.lineTo(p1.px, p1.py);
		this.mc.lineTo(p2.px, p2.py);
		this.mc.lineTo(p0.px, p0.py);
	};

	XMIN = 50;
	XMAX = 650;
	YMIN = 150;
	YMAX = 550;
	FRICTION = 0.8;
	DRAG = 0.99;
	GRAV = 0.2;
	BOUNCE = 0.6;
	MAXLEN = 85;
	MINLEN = 50;
	SHORTENSPEED = 0.9;
	pList = new Array();
	pList.push(new Particle(XMIN, YMIN));
	pList.push(new Particle(XMIN, YMIN + MAXLEN));
	pList.push(new Particle(XMIN + MAXLEN, YMIN));
	sList = new Array();
	sList.push(new Stick(0, 1, MINLEN, MAXLEN));
	sList.push(new Stick(1, 2, MINLEN, MAXLEN));
	sList.push(new Stick(2, 0, MINLEN, MAXLEN));
	gfx = new Renderer();

	function Tick() {
		Integrate();
		Input();
		Constrain();
		Collide();
		gfx.Draw();
	}
	_root.onEnterFrame = Tick;