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index.html
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index.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>pex-random by pex-gl (https://github.com/pex-gl)</title>
<style>
:root {
--color-dark: #404040;
--color-light: #f2f2f2;
--color-accent: #fd5e62;
}
body {
margin: 0;
overscroll-behavior: none;
font-family: sans-serif;
color: var(--color-dark);
background-color: var(--color-light);
}
main {
padding: 0 20px;
}
canvas {
background-color: #fff;
}
.Noise {
display: flex;
flex-wrap: wrap;
gap: 10px;
}
.Chance {
display: flex;
flex-direction: column;
flex-wrap: wrap;
gap: 10px;
}
</style>
</head>
<body>
<main>
<h1>pex-random</h1>
<h2>noise</h2>
<div class="Noise">
<div>
<h3>2D</h3>
<canvas class="Noise-2d-64"></canvas>
<canvas class="Noise-2d-128"></canvas>
<canvas class="Noise-2d-256"></canvas>
</div>
<div>
<h3>3D</h3>
<canvas class="Noise-3d"></canvas>
</div>
<div>
<h3>FBM</h3>
<canvas class="Noise-octave"></canvas>
</div>
</div>
<h2>chance</h2>
<div class="Chance">
<div>
<input
class="Chance-input"
type="number"
value="0.5"
step="0.1"
min="0"
max="1"
/>
<button class="Chance-generate">Generate</button>
</div>
<div>
<canvas class="Chance-canvas" width="128" height="128"></canvas>
</div>
</div>
<h2>vec2/vec3</h2>
<div>
<canvas class="Vec2" width="128" height="128"></canvas>
<canvas class="Vec3" width="128" height="128"></canvas>
</div>
<h2>vec2InRect/vec3InAABB</h2>
<div>
<canvas class="Vec2InRect" width="128" height="128"></canvas>
<canvas class="Vec3InAABB" width="128" height="128"></canvas>
</div>
</main>
<script async src="web_modules/es-module-shims.js" type="module"></script>
<script src="web_modules/import-map.json" type="importmap-shim"></script>
<script type="module-shim">
import random from "./index.js";
import { rect } from "pex-geom";
const drawCircle = (context, x, y, r, fillStyle) => {
if (fillStyle) context.fillStyle = fillStyle;
context.beginPath();
context.arc(x, y, r, 0, Math.PI * 2);
fillStyle ? context.fill() : context.stroke();
};
// vec2
random.seed(0);
const Vec2Ctx = document.querySelector(".Vec2").getContext("2d");
const radius = Vec2Ctx.canvas.width / 4;
Vec2Ctx.translate(Vec2Ctx.canvas.width / 3, Vec2Ctx.canvas.height / 3);
drawCircle(Vec2Ctx, 0, 0, radius);
for (let i = 0; i < 100; i++) {
drawCircle(Vec2Ctx, ...random.vec2(radius), 1, `#000`);
}
// vec3
random.seed(0);
const Vec3Ctx = document.querySelector(".Vec3").getContext("2d");
const radius3 = Vec3Ctx.canvas.width / 4;
Vec3Ctx.translate(Vec3Ctx.canvas.width / 3, Vec3Ctx.canvas.height / 3);
Vec3Ctx.beginPath();
Vec3Ctx.arc(0, 0, radius3, 0, Math.PI * 2);
Vec3Ctx.stroke();
for (let i = 0; i < 100; i++) {
const [x, y, h] = random.vec3(radius);
drawCircle(Vec3Ctx, x, y, 1, `hsl(${360 * h}, 100%, 50%)`);
}
// vec2InRect
random.seed(0);
const Vec2InRectCtx = document
.querySelector(".Vec2InRect")
.getContext("2d");
const r = [
[10, 10],
[100, 100],
];
Vec2InRectCtx.strokeRect(...r[0], rect.width(r), rect.height(r));
for (let i = 0; i < 100; i++) {
drawCircle(Vec2InRectCtx, ...random.vec2InRect(r), 1, `#000`);
}
// vec3InAABB
random.seed(0);
const Vec3InAABBCtx = document
.querySelector(".Vec3InAABB")
.getContext("2d");
const box = [
[10, 10, 10],
[100, 100, 100],
];
Vec3InAABBCtx.strokeRect(...r[0], rect.width(r), rect.height(r));
for (let i = 0; i < 100; i++) {
const [x, y, h] = random.vec3InAABB(box);
drawCircle(Vec3InAABBCtx, x, y, 1, `hsl(${360 * h}, 100%, 50%)`);
}
// chance
const generateChance = () => {
const probability = parseFloat(
document.querySelector(".Chance-input").value
);
const ChanceCtx = document
.querySelector(".Chance-canvas")
.getContext("2d");
const chanceResults = [];
for (let i = 0; i < 100; i++) {
chanceResults.push(random.chance(probability));
}
const { width, height } = ChanceCtx.canvas;
ChanceCtx.clearRect(0, 0, width, height);
const barWidth = width * 0.2;
const barHeight = (height * chanceResults.filter(Boolean).length) / 100;
ChanceCtx.fillRect(0, (1 - probability) * height, width, 2);
ChanceCtx.fillRect(
width * 0.2,
height - barHeight,
barWidth,
barHeight
);
ChanceCtx.fillRect(
width * 0.6,
barHeight,
barWidth,
height - barHeight
);
};
document
.querySelector(".Chance-generate")
.addEventListener("click", generateChance);
document
.querySelector(".Chance-input")
.addEventListener("change", generateChance);
generateChance();
// Noise
// 2D
function drawNoise(ctx, size, fn) {
ctx.canvas.width = size;
ctx.canvas.height = size;
const imageData = ctx.getImageData(0, 0, size, size);
for (let i = 0; i < imageData.data.length; i++) {
const x = i % size;
const y = ~~(i / size);
const n = (fn(x, y) + 1) * 128;
imageData.data[i * 4] = n;
imageData.data[i * 4 + 1] = n;
imageData.data[i * 4 + 2] = n;
imageData.data[i * 4 + 3] = 255;
}
ctx.putImageData(imageData, 0, 0);
}
const frequency = 0.02;
random.seed(0);
drawNoise(
document.querySelector(".Noise-2d-64").getContext("2d"),
64,
(x, y) => random.noise2(x * frequency, y * frequency)
);
random.seed(0);
drawNoise(
document.querySelector(".Noise-2d-128").getContext("2d"),
128,
(x, y) => random.noise2(x * frequency, y * frequency)
);
random.seed(0);
drawNoise(
document.querySelector(".Noise-2d-256").getContext("2d"),
256,
(x, y) => random.noise2(x * frequency, y * frequency)
);
// 3D
let i = 0;
const noise3dCtx = document.querySelector(".Noise-3d").getContext("2d");
random.seed(0);
requestAnimationFrame(async function frame() {
i++;
drawNoise(noise3dCtx, 256, (x, y) =>
random.noise3(x * frequency, y * frequency, i * frequency)
);
await new Promise((resolve) => setTimeout(resolve, 30));
requestAnimationFrame(frame);
});
// FBM
random.seed(0);
drawNoise(
document.querySelector(".Noise-octave").getContext("2d"),
256,
(x, y) => random.fbm({ octaves: 4 }, x * frequency, y * frequency)
);
</script>
</body>
</html>