mirror of
https://github.com/osmarks/random-stuff
synced 2024-11-09 22:09:55 +00:00
61 lines
2.6 KiB
HTML
61 lines
2.6 KiB
HTML
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<!DOCTYPE html>
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<h1>changed version</h1>
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<input type="number" id="w" min="0" value="8" placeholder="width">
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<input type="number" id="h" min="0" value="8" placeholder="height">
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<input type="range" id="d" min="0" max="1" step="0.0001" value="0.1" placeholder="density">
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<button id="run">run</button>
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<br>
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<canvas id="out"></canvas>
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<script>
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const pixels = 32
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const zipWith = (f, xs, ys) => xs.map((x, i) => f(x, ys[i]))
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const sum = xs => xs.reduce((a, y) => a + y, 0)
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const vecAdd = (a, b) => zipWith((x, y) => x + y, a, b)
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const hadamardProduct = (a, b) => zipWith((x, y) => x * y, a, b)
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const scalarMult = (a, n) => a.map(x => x * n)
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const dotProduct = (a, b) => sum(hadamardProduct(a, b))
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const vecLength = a => Math.sqrt(sum(a.map(x => x ** 2)))
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const normalize = a => scalarMult(a, 1/vecLength(a))
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const vsub = (x, y) => vecAdd(x, scalarMult(y, -1))
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const clampDim = (a, i, min, max) => {
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if (a[i] >= max) {
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a[i] = min + a[i] - max
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}
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if (a[i] <= min) {
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a[i] = max - (min - a[i])
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}
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}
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run.onclick = () => {
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const width = parseInt(w.value)
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const height = parseInt(h.value)
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const geomean = Math.sqrt(width * height)
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const rdist = 1 / geomean
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const density = parseFloat(d.value)
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out.width = width * pixels
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out.height = height * pixels
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const ctx = out.getContext("2d")
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/*
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let points = Array(Math.floor(width * height * density)).fill(null).map(x => [Math.random(), Math.random()])
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for (let i = 0; i < 100; i++) {
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for (let j = 0; j < points.length; j++) {
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const p = points[j]
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const v = points.filter((_, k) => k !== j).map(q => {
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const direction = normalize(vsub(p, q))
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const distance = vecLength(vsub(p, q))
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const magnitude = distance < rdist ? -5 : distance ** -3
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return scalarMult(direction, magnitude)
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}).reduce(vecAdd, [0, 0])
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clampDim(p, 0, 0, 1)
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clampDim(p, 1, 0, 1)
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points[j] = vecAdd(p, scalarMult(v, 0.025))
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}
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}
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console.log(points)*/
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for (let x = 0; x < width; x++) {
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for (let y = 0; y < width; y++) {
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ctx.fillStyle = /*points.filter(([p, q]) => p >= (x / width) && p <= ((x + 1) / width) && q >= (y / height) && q <= ((y + 1) / height)).length > 0*/ Math.random() < density ? "green" : "black"
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ctx.fillRect(x * pixels, y * pixels, pixels, pixels)
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}
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}
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}
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</script>
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