JS1k: The JavaScript code golfing competition

for(_='b.~~b`256_=0;_>^=1E3;ZeightY*w.XXPIV?b:U=[]T);Qe*N){Ln(K|0JthG~y~x,r(g[),q(E,q(lF(0==(e&+=.0tion,f-1=x.innervar for(&255,0,+1]+p,return;c.fill.random()0|w*	),d,h=g[Style="],d,h"Rect(y,OQrequestAnimaFrame(I)func 
MT,m^m;m++)M[m]=_*MaGJ;
KeL NNN(N(6*e5)0)}
q(e,b,dL b+N(d-b)}
r(e,bLe&=15;f=8>eUd;b=4>e?d:12==e||14==eUh;1)?f:-f)+2)U-b)}w=MaG,x=window,y=a.widGWidG,O=a.hYHY,A=HT#000CZC--;)H[C]={x:	y,y:	O,a:b:r:1+(0|3*w)J};
I(Lc.globalCompositeOpera="source-over"rgba(   0.075)eZe--;Lb=H[e],d=,h==A,gT,l^l;l++)g[_+l]l]=M[l];t=du=hp=fd=d-(dJh=h-(hJ)=f-(fJl=KdE=Khvt]+u,Fvvvut]+u,tupud=(1+q(Kf]r(g[t)q(lv]r(g[p))]tq(lv]p))))/2*6V%(2VQ~a5Xcos(dQ`5XsiKdQ+=~a;+=`;if(-20>||>y+20||-20>||>O+20)=	y,=	O,~a=`=0hsla("80*(~a+`)%360+", 100%, 85%, .8)";c.beginPaG(Qc.arc(,,~r,2V)()}A25;};';G=/[^ -FHIMOPRSW[\]a-}]/.exec(_);)with(_.split(G))_=join(shift());eval(_)

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

var t = [];
for (var i=0; i < 256 ; i++) t[i] = (Math.random()*256) | 0;

function n(x, y, z) {   
    var p = [];
    for (var i=0; i < 256 ; i++) { 
        p[256+i] = p[i] = t[i];
    } 

    var X = x & 255, Y = y & 255, Z = z & 255;
    x -= x | 0;                               
    y -= y | 0;                                
    z -= z | 0;
    var u = f(x), v = f(y), w = f(z);
    var A = p[X  ]+Y, AA = p[A]+Z, AB = p[A+1]+Z, B = p[X+1]+Y, BA = p[B]+Z, BB = p[B+1]+Z;      

    return s(l(w, l(v, l(u, g(p[AA  ], x  , y  , z   ), g(p[BA  ], x-1, y  , z   )), l(u, g(p[AB  ], x  , y-1, z   ), g(p[BB  ], x-1, y-1, z   ))),
                    l(v, l(u, g(p[AA+1], x  , y  , z-1 ), g(p[BA+1], x-1, y  , z-1 )), l(u, g(p[AB+1], x  , y-1, z-1 ), g(p[BB+1], x-1, y-1, z-1 )))));
}
function f(t) { return t * t * t * (t * (t * 6 - 15) + 10); }
function l(t, a, b) { return a + t * (b - a); }
function g(a, x, y, z) {
    var h = a & 15;                      
    var u = h<8 ? x : y, v = h<4 ? y : h==12||h==14 ? x : z;
    return ((h&1) == 0 ? u : -u) + ((h&2) == 0 ? v : -v);
}
function s(n) { return (1 + n)/2; }


// -------------------------------------------------------------------------
/*
_='f!tii;i++)t[i]=6*Math.random()
nf!dee;e++)d[6+e]e]=t[e];k,m=b,h=c;a-b-=bc-=ce=f),q=f(b),u=f(c),pkrp,pp,mkkm,hm; s(l(uk	ph)k	phf *(6*a5)0l b+(c-bg,da&=15;e=8>ac;b=4>a?c:12=||14=d;1)?e:-e)+2)-bs(1+a)/2};
function ,g(d[return,b,c,b,c],a=d[var 	,l(e-1(a+125|0;]+h)}
=0;6>(0==&,l(q	r){))?b:&5=aa*)=[],]+m,!or(';for(Y in $='!	
')with(_.split($[Y]))_=join(pop());eval(_)
*/
// -------------------------------------------------------------------------
var RES = 512, LEN = 1000, k = 0.05;
var m = Math, d = window;
var aw = a.width = d.innerWidth;
var ah = a.height = d.innerHeight;

var sd = 0, e = [], o = 20;

var r = function(rx){ return 0|( m.random()*rx ) };

c.fillStyle = '#000'
c.fillRect(0, 0, aw, ah)
for (var q = LEN; q--;) e[q] = {x: r(aw), y: r(ah), vx: 0, vy: 0, r: 1+r(3)|0}; 

function drawFrame() {
    c.globalCompositeOperation = 'source-over'
    c.fillStyle = 'rgba(0, 0, 0, 0.075)'
    c.fillRect(0, 0, aw, ah)
    //c.fillStyle = '#fff'
    for (var q = LEN; q--;) {
        var w = e[q];
        var fc = (n(w.x, w.y, sd) * 6 * m.PI) % (2*m.PI);
        //if (!q) console.log(fc/2/m.PI, fc, m.cos(fc)*k, m.sin(fc)*k);
        w.vx += m.cos(fc)*k
        w.vy += m.sin(fc)*k
        w.x += w.vx;
        w.y += w.vy;
        var j = w.x < -o || w.x > aw + o || w.y < -o || w.y > ah + o;
        if (j) {
            w.x = r(aw)
            w.y = r(ah)
            w.vx = w.vy = 0
        }
        var v = w.vx + w.vy 
        c.fillStyle = 'hsla(' + v * 180 % 360 + ', 100%, 85%, .8)'
        c.beginPath();
        c.arc(w.x, w.y, w.r, 0, 2*m.PI);
        c.fill();
    }
    sd += 0.025;
    //a.style.width = window.innerWidth + "px";
    //a.style.height = window.innerHeight + "px";
    requestAnimationFrame(drawFrame);
}
requestAnimationFrame(drawFrame);