canvas = {
const context = DOM.context2d(width, height);
context.fillStyle = "#fff";
context.strokeStyle = "#000";
function stack(da, i0, i1) {
for (let i = i0; i < i1; ++i) {
const a = (i / n) * 2 * Math.PI;
context.save();
context.rotate(a);
context.translate(0, radius);
context.rotate((a * turns) / 4 + da);
context.fillRect(-radius2, -radius2, 2 * radius2, 2 * radius2);
context.strokeRect(-radius2, -radius2, 2 * radius2, 2 * radius2);
context.restore();
}
}
while (true) {
const da = ((Date.now() / 10000) % 1) * 2 * Math.PI;
context.clearRect(0, 0, width, height);
context.save();
context.beginPath();
context.rect(0, height / 2, width, height / 2);
context.clip();
context.translate(width / 2, height / 2);
stack(da, n / 2, (n * 3) / 2);
context.restore();
context.save();
context.beginPath();
context.rect(0, 0, width, height / 2);
context.clip();
context.translate(width / 2, height / 2);
stack(da, 0, n);
context.restore();
yield context.canvas;
}
}
height = Math.min(width, 640)
radius0 = Math.min(width, height) / 2
radius = radius0 * (1 - k * Math.SQRT1_2)
radius2 = radius0 * k / 2
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