Web developer and autodidact with an interest in creative coding.
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Pressure
animation(invalidation, {
duration: -6000,
size: 800,
steps: 20,
radius: 1,
dashes,
strokeWidth: 12,
background: 'black',
color: 'white',
cap: 'round',
pressure: 2,
pressureOffset: .9,
pulseOffset: .2,
dashOffset: -.5,
iMin: 0,
})
function animation(invalidate, options = {}) {
const {
size = 600,
radius = 1,
background = 'white',
color = 'black',
steps = 10,
strokeWidth = 10,
dashes = 10,
duration = 5000,
cap = 'butt',
pressure = 0,
pressureOffset = 0,
pulseOffset = 0,
dashOffset = -.5,
iMin = 0,
} = options;
const ease = t => Math.sin(t*Math.PI*4) * .5 + .5,
mix = (a, b, t) => a + (b - a) * t,
mod = (v, n) => ((v % n) + n) % n,
circles = Array.from({length: steps}, () => svg`<circle>`),
view = svg`
<svg viewBox="${-size/2} ${-size/2} ${size} ${size}"
width=${size} preserveAspectRatio="xMidYMid meet" style="max-width:100%">
<rect x=${-size/2} y=${-size/2} width=${size} height=${size} fill=${background} />
<g transform="rotate(90)" fill=none stroke=${color} stroke-linecap=${cap}>
${circles}`;
const update = tGlobal => {
for(const [i, c] of circles.entries()) {
// Offset avoids flickering.
const ti = (i + iMin) / (circles.length + iMin),
t = ease(ti + tGlobal),
tp = .1*(.5 - ease(-tGlobal + pulseOffset)),
stroke = 2 + t * strokeWidth * mix(tp, 1, .8),
tRotate = Math.floor(.25 + 2 * (ti + tGlobal)),
tRadius = ti + pressure * ease(ti + tGlobal + pressureOffset) * radius/steps,
// A negative radius is invalid.
r = Math.max(0, stroke/2 + size/2 * radius * tRadius * mix(tp, 1, .7)),
length = r * Math.PI * 2,
segment = length / dashes,
gap = segment * t,
dash = segment - gap;
c.setAttribute('r', r);
c.setAttribute('stroke-dasharray', `${dash},${gap}`);
c.setAttribute('stroke-dashoffset', dashOffset * gap);
c.setAttribute('stroke-width', stroke);
c.setAttribute('transform', `rotate(${180/dashes * tRotate})`);
}
};
let raf;
(function loop() {
update(mod(Date.now() / duration, 1));
raf = requestAnimationFrame(() => loop());
})();
Promise.race([invalidation, invalidate]).then(() => cancelAnimationFrame(raf));
return view;
}
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