Web developer and autodidact with an interest in creative coding.
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Arc Flip
function* render(options = {}) {
const {
count = 30,
lineStep = .1,
angleScale = 3,
bundles = 4,
weightBundles = 0,
weightDistortion = 0,
scaleOffset = 1,
size = 600,
radius = .8,
lineWidth = .5,
duration = 6000,
gif = false,
fps = 30,
motionFrames = 0,
colorBg = 'hsla(20,50%,95%,1)',
colorLine = 'hsla(20,50%,0%,1)',
invalidation: invalidate = invalidation,
} = options;
const mix = (a, b, t) => a * (1 - t) + b * t;
const r = size / 2 * radius;
const cs = size / 2;
const p = html`<progress style="width:${size}px;max-width:100%">`;
const ctx = DOM.context2d(size, size, 1);
const PI = Math.PI, TAU = PI * 2, PIH = PI / 2;
const view = html`<div>${ctx.canvas}<br>${p}`;
ctx.lineWidth = lineWidth;
ctx.lineCap = 'round';
ctx.fillStyle = colorBg;
ctx.strokeStyle = colorLine;
ctx.canvas.style.maxWidth = '100%';
ctx.translate(cs, cs);
if(gif) {
const drawFrame = !motionFrames ? render : proxy(render, duration, {fps, factor: motionFrames});
return yield* renderGif(Promise.race([invalidate, invalidation]), drawFrame, duration, {
fps, preview: drawFrame(0),
filename: `mootari--arc-flip`,
converterOptions: {quality: 10, dither: 'FalseFloydSteinberg'}
});
}
while(true) render(p.value = Date.now()/duration % 1), yield view;
function render(t) {
ctx.fillRect(-cs, -cs, size, size);
ctx.beginPath(); ctx.arc(0, 0, r, 0, TAU); ctx.stroke();
const easeLine = ti => Math.cos(ti * TAU) * lineStep * weightDistortion;
ctx.beginPath();
for(let i = 0; i < count; i++) {
const ti = i / count; // line offset [0..1[ centered
const tb = Math.floor(ti * bundles) / bundles; // bundle offset [0..1[
const ox = (t + ti * lineStep + easeLine(ti) + tb * weightBundles) * scaleOffset % 2 * 2;
const rx = Math.sin(ox * PI + PIH) * r; // ellipse width
const a = ti * PI * angleScale; // rotation angle
ctx.moveTo(r * Math.cos(a - PIH), r * Math.sin(a - PIH));
ctx.ellipse(0, 0, Math.abs(rx), r, a, -PIH, PIH, rx < 0);
}
ctx.stroke();
return ctx.canvas;
}
}
((ns = Inputs.text().classList[0]) => html`<style>
.${ns}-input > input[type="number"],
.${ns}-input > input[type="color"] {max-width: 10ch}
`)()
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