JS1k: The JavaScript code golfing competition

b=document.body;f=[];h=600;m=Math;p=m.PI;t=0;r=m.random;q=m.round;w=0;b.style.background="black";b=b.children[0];b.height=b.width=h;c=b.getContext("2d");c.strokeStyle="#FFF";c.lineWidth=0.3;
function k(d,n){var g=r()/4*(q(r())?-1:1),i=r()+0.5,e,u=q(r()*100)+500,j=r()*3+2,l=j/6,o=j-4*l,s=3*l;this.d=function(){if(u--){n+=i+0.2;d+=g;if(d>h)d-=h;if(d<0)d=h-d;with(m){e=min(5,max(0,q(d/h)*6))+6*min(5,max(0,q(n/h)*6));i+=a[e]/400;g+=a[e+36]/80;if(abs(g)>10)g=10*(g<0?-1:1);if(abs(i)>10)i=10*(i<0?-1:1)}e=9;with(c){save();translate(d,n);rotate(p*r()/4);for(beginPath();e--;){lineTo(0,j);moveTo(0,o);lineTo(s,j-l);moveTo(0,o);lineTo(-s,j-l);moveTo(0,0);rotate(p/4)}stroke();closePath();restore()}}else{for(e in f)if(f[e]==
this)break;f.splice(e,1)}};f.push(this)}setInterval(function(){ii=73;if(w<=0)if(q(r()*100)){if(!w){a=[];for(w=-1;--ii;)a.push(r()*2-1)}}else{a=[];for(w=20;--ii>36;)a.push(1);for(;ii--;)a.push(4)}else w--;q(r()*2)||new k(r()*h,0);ii=f.length;for(c.clearRect(0,0,h,h);ii--;)f[ii].d();t++},50);

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

b = document.body, f=[],h=600,m=Math,p=m.PI,t=0,r=m.random,q=m.round,w=0;
b.style.background="black";
b=b.children[0];
b.height = b.width = h;
c = b.getContext('2d');
c.strokeStyle = "#FFF";
c.lineWidth = 0.3;

function k(x, y) {
    var vx = r()/4 * (q(r()) ? -1 : 1),
        vy = r()+0.5, n,
        dc=q(r()*100)+500,
        s = r()*3+2,
        qs = s/6, qs2 = s - 4 * qs, qs3=3*qs;
    this.d = function () {
        if (!dc--) {
            for (n in f) {
                if (f[n] == this) break;
            }
            f.splice(n, 1);
            return
        }

        // step
        y += vy + 0.2;
        x += vx;
        if (x > h) x=x-h;
        if (x < 0) x=h-x;
        with(m) {
            n = min(5, max(0, q(x/h)*6)) +
                6 * min(5, max(0, q(y/h)*6));
            vy += a[n]/400;
            vx += a[n+36]/80;
            if (abs(vx) > 10) {
                vx = 10 * (vx < 0 ? -1 : 1);
            }
            if (abs(vy) > 10) {
                vy = 10 * (vy < 0 ? -1 : 1);
            }
        }


        n = 9;
        with (c) {
            save();
            translate(x, y);
            // end step

            // random rotation
            rotate(p*r()/4);
            beginPath();
            while (n--) {
                lineTo(0, s);
                moveTo(0, qs2);
                lineTo(qs3, s - qs);
                moveTo(0, qs2);
                lineTo(-qs3, s - qs);
                moveTo(0, 0);
                rotate(p/4);
            }
            stroke();
            closePath();
            restore();
        }
    };
    f.push(this);
}

setInterval(function () {
    ii = 73;
    if (w <= 0) {
        if (!q(r()*100)) {
            a= [];
            w = 20;
            while (--ii > 36) {
                a.push(1);
            }
            while (ii--) {
                a.push(4);
            }
        } else if (!w) {
            a= [];
            w = -1;
            while (--ii) {
                a.push(r()*2 - 1);
            }
        }
    } else {
        w--;
    }

    if (!q(r()*2)) {
        new k(r()*h, 0);
    }
    ii=f.length;
    c.clearRect(0, 0, h, h);
    while (ii--) {
        f[ii].d();
    }
    t++;
},50);