JS1k: The JavaScript code golfing competition

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')with(_.split($[Y]))_=join(pop());eval(_)

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/*
     * Moneybugs by Jason "--jp" Plackey
     * jp [at] chicagowebexperts [dot] com
     *
     * For JS1k 2018 - 2018 - The Volatile Coin Mine
     * Final packed entry size is 1010b.
     *
     * Moneybugs gather as the sun sets, but come dark,
     * only the strongest stick around.
     *
     * Due to Unicode/Emoji differences cross platform,
     * this demo is best on Windows, where the money bag
     * has a green dollar sign $ in the center of it.
     *
     * Performs best on Chrome/Firefox.
     */

    function bag() {
        c.font = '100px C';
        c.fillText('💰', 0, 200)
        c.strokeStyle = '#f00';
    }

    bag();
    i = c.getImageData(0, 100, 150, 150);
    c.fillStyle = '#fff';
    c.fillRect(0, 0, 400, 400);

    var pts = [];
    for (var y = 0; y < 150; y++) {
        for (var x = 0; x < 150; x++) {
            var o = (y * 150 * 4) + (x * 4);
            var r = i.data[o];
            var g = i.data[o + 1];
            var b = i.data[o + 2];
            var a = i.data[o + 3];
            if (r == 0 && g == 0 && b == 0) {
                r = 255; g = 255; b = 255;
            }

            if (a != 0) {
                pt = {
                    tx: (x * 8) + 450, ty: (y * 8),
                    cr: r, tr: (Math.random()*2)+2,
                    cg: g, tg: (Math.random() * 2) + 2,
                    cb: b, tb: b,
                    ca: a, ta: a,
                    cx: Math.random() * 1920,
                    cy: Math.random() * 1080
                };
                pts.push(pt);
            }
        }
    }

    var frame = 500;
    var light = 0.5;
    t = setInterval(e => {
        fillStyle = '#000';
        c.fillRect(0, 0, 1920, 1080);
        grd = c.createRadialGradient(0,0,1920,1080,1920,1080);
        grd.addColorStop(0.000, 'rgba(255, 242, 0, ' + light + ')');
        grd.addColorStop(0.370, 'rgba(255, 157, 0, ' + light + ')');
        grd.addColorStop(1.000, 'rgba(47, 32, 163, ' + light + ')');
        c.fillStyle = grd;
        c.fillRect(0, 0, 1920,1080);

        var ar = pts;
        for (var idx = 0; idx < ar.length; idx++) {
            c.fillStyle = 'rgba(' + ar[idx].cr + ',' + ar[idx].cg + ',' + ar[idx].cb + ',' + ar[idx].ca + ')';
            c.beginPath();
            c.strokeStyle = c.fillStyle;
            c.ellipse(ar[idx].cx, ar[idx].cy, ar[idx].tr, ar[idx].tg, Math.random()*360, 0, Math.PI * 2);
            c.fill();
            var step = (1000 - Math.min(frame, 980));
            dx = (ar[idx].tx - ar[idx].cx + (Math.random() * 200) - 100) / step;
            dy = (ar[idx].ty - ar[idx].cy + (Math.random() * 200) - 100) / step;
            da = (ar[idx].ta - ar[idx].ca) / (step/4);

            ar[idx].cx += dx;
            ar[idx].cy += dy;
            ar[idx].ca += da;
        }
        c.fillStyle = '#000';
        frame += 2;

        if (frame >= 1300) {
            light -= 0.0005;
            if (light < 0.2) light = 0.2;
            for (var a = 0; a < 20; a++) {
                zz = Math.round(Math.random() * pts.length);
                if (pts[zz].cg > (pts[zz].cr*2) ) { continue; }
                pts[zz].ty = window.innerHeight - 6;
                pts[zz].tx = pts[zz].tx + ((Math.random() * 600) - 300);
                pts[zz].ta = 0;
            }
        }
    }, 16);