Web developer and autodidact with an interest in creative coding.
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Circumscribed Squares
{
const options = {
width: 900,
height: 400,
centerX: .5, // Horizontal center (ratio)
centerY: .95, // Vertical center (ratio)
seedSize: 5, // Size of the innermost square (not rendered)
count: 40, // Number of squares
rotationGlobal: .0, // Global rotation
rotationMin: .01, // Min initial square rotation (1 = full rotation)
rotationMax: .2, // Max initial square rotation (1 = full rotation)
rotationSpeed: .0005, // Max rotation speed per square (rotations cascade)
rotationShift: 0, // Power applied to normalized square index
// Fill lightness
lightInner: .1, // Inner square lightness
lightOuter: 1, // Outer square lightness
lightShift: 1.05, // Power applied to normalized square index
lineWidth: 2,
lineLight: 1, // Line lightness
lineOpacity: .03,
colorFn: colorAlternate, // Color callback
rng: Math.random,
};
reset;
const {width: w, height: h, rng} = options;
const clearColor = `hsl(0,0%,${options.lightOuter}%)`;
const color = options.colorFn(options);
const cx = w * options.centerX, cy = h * options.centerY;
const c = DOM.context2d(w, h);
c.canvas.style.maxWidth = '100%';
const {PI} = Math;
const randAngle = (min, max) => mix(min, max, rng()) * PI * 2;
const angles = Array(options.count).fill().map((v,i) => {
// Alternate directions.
return mix(-1, 1, i % 2) * randAngle(options.rotationMin, options.rotationMax);
});
c.strokeStyle = `hsla(0,0%,${options.lineLight * 100}%,${options.lineOpacity})`;
c.lineWidth = options.lineWidth;
let t = 0;
while(true) {
clear();
draw(angles, t);
yield c.canvas;
t += options.rotationGlobal;
angles.forEach((a, i, arr) => {
const t = (i+1)/arr.length ** options.rotationShift;
arr[i] += Math.sign(a) * t * options.rotationSpeed;
});
}
function draw(angles, t = 0) {
let s = options.seedSize, aGlobal = t * PI * 2;
const squares = angles.map((aLocal, i, arr) => ({
size: (s = s * (Math.abs(Math.cos(aLocal)) + Math.abs(Math.sin(aLocal)))),
aGlobal: (aGlobal += aLocal),
aLocal,
}));
for(let i = squares.length - 1; i >= 0; i--) {
const square = squares[i];
c.beginPath();
drawSquare(square);
c.fillStyle = color(square, i);
c.fill();
if(c.lineWidth > 0) c.stroke();
}
}
function drawSquare({size, aGlobal}) {
c.save();
c.translate(cx, cy);
c.rotate(aGlobal);
c.translate(-cx, -cy);
c.rect(cx - size/2, cy - size/2, size, size);
c.restore();
}
function clear() {
c.save();
c.fillStyle = clearColor;
c.fillRect(0, 0, w, h);
c.restore();
}
}
function colorFromSize(options) {
const {width, height, lightInner, lightOuter, lightShift} = options;
const max = Math.max(width, height);
return (square, i) => {
const t = mix(lightInner, lightOuter, square.size / max ** options.lightShift);
return `hsl(0, 0%, ${t*100}%)`;
};
}
function colorFromAngle(options) {
return (square, i) => {
const t = Math.sin(square.aGlobal) * .5 + .5;
return `hsl(0, 0%, ${t*100}%)`;
};
}
function colorAlternate(options) {
const {lightInner, lightOuter} = options;
return (square, i) => {
const t = mix(lightInner, lightOuter, i%2);
return `hsl(0, 0%, ${t*100}%)`;
};
}
function mix(a, b, t) {
return a + (b - a) * t;
}
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