JS1k: The JavaScript code golfing competition

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var time = 0, 
	rqaf = window.requestAnimationFrame,
	rand = Math.random,
	w = a.width, 
	h = a.height,
	nbtc = 0,						//number of bitcoins
	btcs = [];
	slot = [1,1,3,1,1,3,3,3];		//screen quadrants position
	btc = function(){this.create()};
	

btc.prototype = {
	 
	create: function() {
		this.n = nbtc;
		this.x = slot[2*nbtc]*w/4;	//put bitcoin on quadrant
		this.y = slot[2*nbtc+1]*h/4;
		this.r = rand()*10-5;		//rotation
		this.s = rand()*0.4+0.1;	//size
		this.d = 0;					//progressive rendering
	},
	update: function() {
		if ( time % 10 == 0 ) {
			this.d++;				//render one more block
			
		};
		
		if (this.d > 20) {			//bitcoin is complete so accelerate
			if (this.r > 0) {
			this.r++;
			} else {
				this.r--;
				};
			if (this.d > 40) {		//value variation
				this.s = rand()*0.4+0.1;
			};
			if (this.d > 60) {		//mayhem
				this.s = 5*rand()+0.1;
			};
				
		};
		if (this.d > 100) {			//universe collapses
				top.reload();
			};
	},
	render: function() {
		posbtc(this.x,this.y,this.s,this.r,this.d);
	},
}

function drawbtc(d) {
	c.fillStyle = 'orange';
	c.beginPath();
	c.arc(300, 300, 450, 0, 2 * Math.PI, false);
	c.fill();
	c.closePath(); 

	if (d<1) return;				//render only this block
	
	c.translate(100,100);


	c.fillStyle = 'white';
	
	c.fillRect(0, 50, 300, 300);  
	if (d<2) return;				//next time add this block
	c.fillRect(100, 0, 50, 400);
	if (d<3) return;				//next time add this block
	c.fillRect(200, 0, 50, 400);
	if (d<4) return;				//etc

	c.beginPath();
	c.arc(300, 100, 50, 0, 2 * Math.PI, false);
	c.fill();
	if (d<5) return;
	c.arc(300, 250, 100, 0, 2 * Math.PI, false);
	c.fill();
	if (d<6) return;

	c.fillStyle = 'orange';

	c.fillRect(0, 100, 50, 200);
	if (d<7) return;
	c.fillRect(150, 100, 100, 50);
	if (d<8) return;
	c.fillRect(150, 200, 100, 100);
	if (d<9) return;

	c.beginPath();
	c.arc(250, 125, 25, 0, 2 * Math.PI, false);
	c.fill();
	if (d<10) return;
	c.arc(250, 250, 50, 0, 2 * Math.PI, false);
	c.fill();
	
}

function posbtc(x,y,s,r,t) {
	c.save();
	c.translate(x,y);
	c.rotate(r * time * Math.PI / 180);
	c.scale(s,s);
	c.translate(-300,-300);
	drawbtc(t);
	c.restore();
				
}
	
var main = function() {
	c.clearRect(0, 0, w, h);
	
	
	if ( time % 60 == 0 && nbtc < 4) {	//add one btc per sec.
		btcs.push( new btc());
		nbtc++;
		
	}
	for (var i=0;i<nbtc;i++) {
		btcs[i].update();
		btcs[i].render();
	}
	
	time++;
	rqaf( main );
}

rqaf( main );