JS1k: The JavaScript code golfing competition

_='a=docu@ALEle@AsByTagNa@Dcanvas")[0];c=aLCoAextD2d"wWidF;hH&;fc=PI;a.widF=w;a.h&=h;m=255;n=128;z=[[GGnGGn]];cx=w/4cy=h-h/4lr=?;sr=7;0function f){OhJ0;32>e;e++)g=0;12>g;g++)b=g/1fc,x=cx+<cosy=cy-<sd=z[g],,c.arc(x,y,sf/:,fc,!1),rgbaD+d[0d[1d[2e/m+")",(;O.1*$.9*h,$?*f.8h,30J.5	J1.3	K+;setTi@outD"+K"",?)};
;Rect((b+2/8)*l6:/2,%(1.6-.wStylJ"0,RenderScene(],[MaF.	
e,3h]+", "+=wdow.nerc.begPaF()c.fill(?*K,$m,r*e*(s();parseIA(2*for(var (Ke)/#000"inw,0m*w).$h)
&eight:4)+2)<1e+?50@meAntD("FthGn,Je=Kf+L.getO
';for(Y in $='OLKJGFDA@?<:&$	
')with(_.split($[Y]))_=join(pop());eval(_)

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

// Setup canvas to fill screen
	a = document.getElementsByTagName("canvas")[0];
	c = a.getContext("2d");
	w = window.innerWidth;
	h = window.innerHeight;
	fc = 2 * Math.PI;
	a.width  = w;
	a.height = h;
	
	m = 255;
	n = 128;
	
	z = [[m,0,0],[m,n,0],[m,m,0],[n,m,0],[0,m,0],[0,m,n],[0,m,m],[0,n,m],[0,0,m],[n,0,m],[m,0,m],[m,0,n]];
	
	cx = parseInt(w / 4);  // Center x
	cy = h - parseInt(h / 4);  // Center y
	lr = 50;   // Large radius
	sr = 7;    // Small radius

	RenderScene(0);

	// Render scene
	function RenderScene(t){
		c.fillStyle = "#000";
		c.fillRect(0, 0, w, h);
		
		// Render tower of circles
		for (var l = 0; l < 32; l++){
			// Render circle of smaller circles
			for (var i = 0; i < 12; i++){
				b = (i/12)*fc;
				x = cx + (l * 12) + Math.cos(b + ((t+l))/2/8) * (lr * l * (Math.sin((t+l)/64) + 2))/2;
				y = cy - (l * 12) + Math.sin(b + ((t+l)/2)/8) * (lr * l * (Math.sin((t+l)/64) + 2))/2;
				d = z[i];
				
				c.beginPath();
				c.arc(x, y, ((sr * l))*(Math.sin(t/4) + 2), 0, fc, false);
				
				c.fillStyle = "rgba(" + d[0] + ", " + d[1] + ", " + d[2] + ", " + l/m + ")";
				c.fill();
			}
		}
		
		// window frame parts
		c.fillStyle = "#000";
		
		// Top
		c.beginPath();
		c.fillRect(0, 0, w, h * 0.1);
		
		// Bottom
		c.fillRect(0, h * 0.9, w, h);
		
		// V Bar 1
		var x1 = (t * 50) % (w * 1.6) - (w * 0.2);
		c.fillRect(x1, 0, w * 0.2, h);
		
		// V Bar 2
		var x2 = (t * 50 + w * 0.8) % (w * 1.6)- (w * 0.2);
		c.fillRect(x2, 0, w * 0.2, h);
		
		// Window bars
		c.fillRect(0, h * 0.2, w, 30);
		
		var x3 = (t * 50 + w * 0.5) % (w * 1.6) - (w * 0.2);
		c.fillRect(x3, 0, 30, h * 0.2);
		
		var x3 = (t * 50 + w * 1.3) % (w * 1.6) - (w * 0.2);
		c.fillRect(x3, 0, 30, h * 0.2);
		
		t++;
		setTimeout("RenderScene(" + t + ");", 50);
	}