JS1k: The JavaScript code golfing competition

function D(i,r,t){c.fillStyle=t,c.fillRect(i,r,1,1)}function S(i,r,c,t){for(s=Math.PI/10,$i=0;$i<=20;$i++)$x=c*Math.cos(s*$i),$y=c*Math.sin(s*$i),D($x+i,$y+r,t)}function col(){for(i=0;i<3;i++)co[i]>255?co[i]=110:co[i]++;return co}function add(i){col(),arr.push({r:1,x:i.clientX,y:i.clientY,c:"rgb("+co[0]+","+co[1]+","+co[2]+")"})}arr=[],setInterval(function(){for(c.fillStyle="#000",c.fillRect(0,0,a.width,a.height),i=0;i<arr.length;i++)S(arr[i].x,arr[i].y,arr[i].r,arr[i].c),arr[i].r++,arr[i].r>200&&arr.splice(i,1)},50),co=[110,180,230],window.addEventListener("click",add),window.addEventListener("mousemove",add);

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function D(x, y, C) {
    c.fillStyle = C
    c.fillRect(x, y, 1, 1);
}
function S(posX, posY, r, C) {
    s = Math.PI / 10
    for ($i = 0; $i <= 20; $i++) {

        $x = r * Math.cos(s * $i);
        $y = r * Math.sin(s * $i);
        D($x + posX, $y + posY, C)

    }
}
arr = []
setInterval(function() {
    c.fillStyle = '#000';
    c.fillRect(0, 0, a.width, a.height);
    for (i = 0; i < arr.length; i++) {
        S(arr[i].x, arr[i].y, arr[i].r, arr[i].c)
        arr[i].r++;
        if (arr[i].r > 200) {
            arr.splice(i, 1);
        }
    }
}, 50);
co = [110, 180, 230];
function col() {
    for (i = 0; i < 3; i++) {
        if (co[i] > 255) {
            co[i] = 110
        } else {
            co[i]++
        }
    }
    return co;
}
function add(e) {
    col();
    arr.push({
        r: 1,
        x: e.clientX,
        y: e.clientY,
        c: 'rgb(' + co[0] + ',' + co[1] + ',' + co[2] + ')'
    });
}
window.addEventListener('click', add);
window.addEventListener('mousemove', add);