Web developer and autodidact with an interest in creative coding.
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Feedback Fade
{
const options = {
width: 800,
height: 400,
maxCount: 45,
lineWidth: 5,
pulses: 1,
minRadius: .0,
minDecay: .0001,
maxDecay: .01,
saturation: 100,
opacity: .3,
edgePad: 50,
maxDashOffsets: 6,
maxDashSegmentLength: 100,
feedbackFade: .03,
feedbackScaleDelta: .015,
feedbackMove: 10,
feedbackCenter: .01,
};
const {width: w, height: h} = options;
const cx = w/2, cy = h/2;
const PI2 = Math.PI * 2;
const c = DOM.context2d(w,h,1);
c.canvas.style.maxWidth = '100%';
c.lineCap = 'round';
fill('#000');
const fnr = t => mix(Math.sin(Math.PI + t * PI2 * options.pulses) * .5 + .5, 1, options.minRadius);
const maxr = (x, y, p) => Math.max(0, Math.min((x < cx ? x : w - x), y < cy ? y : h - y) - p);
const rings = new Set;
let mx = cx, my = cy, move = (v, c) => mix(c, v + (Math.random()*2-1) * options.feedbackMove, 1-options.feedbackCenter);
let t = 0;
while(true) {
copy(1+options.feedbackScaleDelta, mx = move(mx, cx), my = move(my, cy));
fill(`hsla(0,0%,0%,${options.feedbackFade})`);
for(let r of rings) {
if((r.t -= r.decay) <= 0) {
rings.delete(r);
continue;
}
c.save();
c.beginPath();
c.globalCompositeOperation = 'screen';
c.strokeStyle = `hsla(${r.hue},${options.saturation*r.t}%,50%,${options.opacity*r.t})`;
c.lineWidth = options.lineWidth;
c.setLineDash(r.linedash);
c.arc(r.x, r.y, fnr(r.t) * maxr(r.x, r.y, options.edgePad), 0, PI2);
c.stroke();
c.restore();
}
yield c.canvas;
while(rings.size < options.maxCount) {
rings.add({
x: Math.random() * w,
y: Math.random() * h,
t: 1,
hue: Math.random() * 360,
decay: mix(options.minDecay, options.maxDecay, Math.random()),
linedash: Array(Math.random()*options.maxDashOffsets|0).fill().map(v => Math.random()*options.maxDashSegmentLength),
});
}
}
function copy(scale, cx, cy) {
c.save();
c.translate(cx, cy);
c.scale(scale, scale);
c.translate(-cx, -cy);
c.drawImage(c.canvas, 0, 0);
c.restore();
}
function fill(col) {
c.save();
c.fillStyle = col;
c.fillRect(0, 0, w, h);
c.restore();
}
function mix(a, b, t) {
return a + (b - a) * t;
}
}
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