JS1k: The JavaScript code golfing competition

_='({ t{u=x	0+y	d=[+z	c={};==?(,c=):(c=,c,)x=uy=bz=dijl0h=	900)^=1g="ABCDEFGHIJKLMNOPRSTUVWXYZ".charAt(	26))m=!1} d,b,e){d=
random*(b-d)+d|0;e&&(d=(d/e|0)*ereturn d}a,d@getC~t("2d"h@width,k@height,v=h/2,w=k/2,e={},l,m=	x=/60	n=	y=/	q,r;f~t="normal 12px m~ospace";tAligntBaselinefor(i=0;4E3>i;i++)	36	2)/360*,l=
a	10	1)/100*2-1xlylz#ft(setInterval({m=(m+x`n=(n+y`q=
mr=
nclearRect(		h,kfor(p=;!=p;){g=p;f++;f>h&&(]=i,y+=j,z+=l-q*]r+[,400/(400-b(r*]q)*f+v;c=y*f+w;b>h_b_c||c>k||398<b?(p,===b?!?(b,):=:=?Q=:(Q,bQ)):(1-b/-75	1<b?1:0>b?0:bStyle="rgba("+b*^+")",begin$T(g,b,cclose$p=g}},1E3/60)})(
Math.e.first.nnullp.functi~;c.2*
PI	0,=1,5)#f)*
,fill);*(z- [)var cos(="center";.a=ext30()d.=bsin(26, =c,cb=g(),#0=0*
$Path@=f.Qb.a[-3]x+^alpha_||0>`)%(~onf=';for(Y in $='~`_^][Q@$#	
')with(_.split($[Y]))_=join(pop());eval(_)

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

(function() {
	var theCanvas = document.getElementById("canvasOne");
	var context = theCanvas.getContext("2d");
    var displayWidth = theCanvas.width, displayHeight = theCanvas.height;
    var projCenterX = displayWidth/2, projCenterY = displayHeight/2;
    
    var particleList = {};
    var phi, theta, sphereRad = 300, sphereCenterX = 0, sphereCenterY = 0, sphereCenterZ = -3 - sphereRad;
    var turnAngleX = 0, turnSpeedX = 2*Math.PI/600;
    var turnAngleY = 0, turnSpeedY = 2*Math.PI/300;
    var sinAngle, cosAngle;
    var fLen = 400, zeroAlphaDepth = -750, numParticles = 4000;
    var rgbString = "rgba(26, 26, 26, ";
    
    var init = function() {
        context.font = 'normal 12px monospace';
        context.textAlign = 'center';
        context.textBaseline = 'center';
        
        for (i = 0; i < numParticles; i  ) {
            phi = (rand(0, 360, 2)/360)*2*Math.PI;
            theta = Math.acos((rand(0, 100, 1)/100*2)-1);
            
            x0 = sphereRad*Math.sin(phi)*Math.cos(theta);
            y0 = sphereRad*Math.sin(phi)*Math.sin(theta);
            z0 = sphereRad*Math.cos(phi);
            
            var p = addParticle(x0, sphereCenterY   y0, sphereCenterZ   z0);
        }
        
        setInterval(mainLoop, 1000/60);
    };
    
    var mainLoop = function() {
        updateViewAngle();
        context.clearRect(0, 0, displayWidth, displayHeight);
        updateAndDrawParticles();
        //requestAnimationFrame(mainLoop);
    };
    
    var updateViewAngle = function() {
		turnAngleX = (turnAngleX   turnSpeedX) % (2*Math.PI);
        turnAngleY = (turnAngleY   turnSpeedY) % (2*Math.PI);
		sinAngle = Math.sin(turnAngleX);
		cosAngle = Math.cos(turnAngleY);
    };
    
    var updateAndDrawParticles = function() {
		p = particleList.first;
		while (p != null) {
			var nextParticle = p.next;
			
			p.age  ;
            
            if (p.age > p.stuckTime) {	
				p.x  = p.velX;
				p.y  = p.velY;
				p.z  = p.velZ;
			}
			
			var rotX = cosAngle*p.x   sinAngle*(p.z - sphereCenterZ);
			var rotZ = -sinAngle*p.x   cosAngle*(p.z - sphereCenterZ)   sphereCenterZ;
			var m = fLen/(fLen - rotZ);
			p.projX = rotX*m   projCenterX;
			p.projY = p.y*m   projCenterY;

            if ((p.projX > displayWidth)||(p.projX<0)||(p.projY<0)||(p.projY>displayHeight)||(rotZ>fLen-2)) {
				// particle out of bounds, kill it!
                killParticle(p);
			} else {
                //depth-dependent darkening
                var depthAlphaFactor = (1-rotZ/zeroAlphaDepth);
                depthAlphaFactor = (depthAlphaFactor > 1) ? 1 : ((depthAlphaFactor<0) ? 0 : depthAlphaFactor);
                context.fillStyle = rgbString   depthAlphaFactor*p.alpha   ")";

                //draw
                context.beginPath();
                context.fillText(p.letter, p.projX, p.projY);
                context.closePath();
                context.fill();

            }
            p = nextParticle;   
		}
    };
    
    var killParticle = function(p) {
		if (particleList.first === p) {
			if (p.next != null) {
				p.next.prev = null;
				particleList.first = p.next;
			} else {
				particleList.first = null;
			}
		} else {
			if (p.next == null) {
				p.prev.next = null;
			} else {
				p.prev.next = p.next;
				p.next.prev = p.prev;
			}
		}
        p = null;
    };
    
    var rand = function(a, b, step) {
        var value = (Math.random() * (b - a)   a) | 0;
        if (step) {
            value = ((value / step) | 0) * step;
        }
        return value;
    };
    
    var addParticle = function(x0, y0, z0) {
		var newParticle = {};
		
		if (particleList.first == null) {
			particleList.first = newParticle;
			newParticle.prev = null;
			newParticle.next = null;
		} else {
			newParticle.next = particleList.first;
			particleList.first.prev = newParticle;
			particleList.first = newParticle;
			newParticle.prev = null;
		}
		
		newParticle.x = x0;
		newParticle.y = y0;
		newParticle.z = z0;
        newParticle.velX = rand(1, 5);
        newParticle.velY = rand(1, 5);
        newParticle.velZ = rand(1, 5);
        newParticle.age = 0;
        newParticle.stuckTime = rand(300, 900);
        newParticle.alpha = 1;
        newParticle.letter = "ABCDEFGHIJKLMNOPQRSTUVXWYZ".charAt(rand(0, 26));
		newParticle.dead = false;
		return newParticle;		
	};
    
    init();
})();