Create canvas with ripple effect on click
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7 changed files with 80 additions and 126 deletions
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bun.lockb
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@ -2,12 +2,11 @@
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<link rel="icon" type="image/svg+xml" href="/vite.svg" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Vite + TS</title>
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<title>ripples | compost.party</title>
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</head>
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<body>
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<div id="app"></div>
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<canvas id="canvas"></canvas>
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<script type="module" src="/src/main.ts"></script>
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</body>
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</html>
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@ -10,6 +10,7 @@
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},
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"devDependencies": {
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"typescript": "^5.2.2",
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"typescript-language-server": "^4.3.1",
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"vite": "^5.0.8"
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}
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}
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@ -1,9 +0,0 @@
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export function setupCounter(element: HTMLButtonElement) {
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let counter = 0
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const setCounter = (count: number) => {
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counter = count
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element.innerHTML = `count is ${counter}`
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}
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element.addEventListener('click', () => setCounter(counter + 1))
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setCounter(0)
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}
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91
src/main.ts
91
src/main.ts
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@ -1,24 +1,73 @@
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import './style.css'
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import typescriptLogo from './typescript.svg'
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import viteLogo from '/vite.svg'
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import { setupCounter } from './counter.ts'
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document.querySelector<HTMLDivElement>('#app')!.innerHTML = `
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<div>
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<a href="https://vitejs.dev" target="_blank">
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<img src="${viteLogo}" class="logo" alt="Vite logo" />
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</a>
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<a href="https://www.typescriptlang.org/" target="_blank">
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<img src="${typescriptLogo}" class="logo vanilla" alt="TypeScript logo" />
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</a>
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<h1>Vite + TypeScript</h1>
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<div class="card">
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<button id="counter" type="button"></button>
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</div>
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<p class="read-the-docs">
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Click on the Vite and TypeScript logos to learn more
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</p>
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</div>
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`
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const canvas = document.querySelector<HTMLCanvasElement>('#canvas')!
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setupCounter(document.querySelector<HTMLButtonElement>('#counter')!)
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const ctx = canvas.getContext('2d')!
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const MIN_RADIUS = 20
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const MAX_RADIUS = 200
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const MAX_AGE = 5000 // in milliseconds
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type Particle = {
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position: [number, number],
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age: number
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}
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const createParticle = (x: number, y: number): Particle => ({
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position: [x, y],
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age: 0,
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})
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let state = {
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particles: <Particle[]>[]
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}
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type State = typeof state
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canvas.addEventListener('click', (e) => {
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// TODO Normalize x and y coords
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const particle = createParticle(e.clientX, e.clientY)
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state.particles.push(particle)
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})
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const update = (state: State, deltaTime: number): State => ({
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particles: state.particles
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.map(p => ({
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...p,
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age: p.age + deltaTime
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}))
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.filter(p => p.age < MAX_AGE)
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})
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const render = (state: State, ctx: CanvasRenderingContext2D) => {
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ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height)
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for (const particle of state.particles) {
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const progress = (particle.age / MAX_AGE)
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const opacity = Math.min(1, (1-progress)*(1-progress))
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ctx.beginPath()
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ctx.strokeStyle = `rgba(40, 40, 40, ${opacity})`
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const [x, y] = particle.position
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const radius = (progress * (MAX_RADIUS - MIN_RADIUS)) + MIN_RADIUS
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ctx.ellipse(x, y, radius, radius, 0, 0, Math.PI * 2)
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ctx.stroke()
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}
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}
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let before = Date.now()
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const loop = () => {
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const now = Date.now()
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const dt = now - before
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state = update(state, dt)
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render(state, ctx)
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before = now
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requestAnimationFrame(loop)
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}
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document.addEventListener('DOMContentLoaded', () => {
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canvas.width = canvas.parentElement!.clientWidth
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canvas.height = canvas.parentElement!.clientHeight
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ctx.translate(0.5, 0.5)
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loop()
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})
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@ -1,96 +1,11 @@
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:root {
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font-family: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif;
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line-height: 1.5;
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font-weight: 400;
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color-scheme: light dark;
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color: rgba(255, 255, 255, 0.87);
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background-color: #242424;
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font-synthesis: none;
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text-rendering: optimizeLegibility;
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-webkit-font-smoothing: antialiased;
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-moz-osx-font-smoothing: grayscale;
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}
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a {
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font-weight: 500;
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color: #646cff;
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text-decoration: inherit;
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}
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a:hover {
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color: #535bf2;
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}
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html,
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body {
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margin: 0;
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display: flex;
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place-items: center;
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min-width: 320px;
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min-width: 100wh;
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min-height: 100vh;
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padding: 0;
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margin: 0;
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}
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h1 {
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font-size: 3.2em;
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line-height: 1.1;
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}
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canvas {
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#app {
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max-width: 1280px;
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margin: 0 auto;
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padding: 2rem;
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text-align: center;
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}
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.logo {
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height: 6em;
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padding: 1.5em;
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will-change: filter;
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transition: filter 300ms;
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}
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.logo:hover {
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filter: drop-shadow(0 0 2em #646cffaa);
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}
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.logo.vanilla:hover {
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filter: drop-shadow(0 0 2em #3178c6aa);
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}
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.card {
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padding: 2em;
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}
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.read-the-docs {
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color: #888;
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}
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button {
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border-radius: 8px;
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border: 1px solid transparent;
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padding: 0.6em 1.2em;
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font-size: 1em;
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font-weight: 500;
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font-family: inherit;
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background-color: #1a1a1a;
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cursor: pointer;
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transition: border-color 0.25s;
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}
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button:hover {
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border-color: #646cff;
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}
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button:focus,
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button:focus-visible {
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outline: 4px auto -webkit-focus-ring-color;
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}
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@media (prefers-color-scheme: light) {
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:root {
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color: #213547;
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background-color: #ffffff;
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}
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a:hover {
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color: #747bff;
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}
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button {
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background-color: #f9f9f9;
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}
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}
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@ -1 +0,0 @@
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<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="32" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 256"><path fill="#007ACC" d="M0 128v128h256V0H0z"></path><path fill="#FFF" d="m56.612 128.85l-.081 10.483h33.32v94.68h23.568v-94.68h33.321v-10.28c0-5.69-.122-10.444-.284-10.566c-.122-.162-20.4-.244-44.983-.203l-44.74.122l-.121 10.443Zm149.955-10.742c6.501 1.625 11.459 4.51 16.01 9.224c2.357 2.52 5.851 7.111 6.136 8.208c.08.325-11.053 7.802-17.798 11.988c-.244.162-1.22-.894-2.317-2.52c-3.291-4.795-6.745-6.867-12.028-7.233c-7.76-.528-12.759 3.535-12.718 10.321c0 1.992.284 3.17 1.097 4.795c1.707 3.536 4.876 5.649 14.832 9.956c18.326 7.883 26.168 13.084 31.045 20.48c5.445 8.249 6.664 21.415 2.966 31.208c-4.063 10.646-14.14 17.879-28.323 20.276c-4.388.772-14.79.65-19.504-.203c-10.28-1.828-20.033-6.908-26.047-13.572c-2.357-2.6-6.949-9.387-6.664-9.874c.122-.163 1.178-.813 2.356-1.504c1.138-.65 5.446-3.129 9.509-5.485l7.355-4.267l1.544 2.276c2.154 3.29 6.867 7.801 9.712 9.305c8.167 4.307 19.383 3.698 24.909-1.26c2.357-2.153 3.332-4.388 3.332-7.68c0-2.966-.366-4.266-1.91-6.501c-1.99-2.845-6.054-5.242-17.595-10.24c-13.206-5.69-18.895-9.224-24.096-14.832c-3.007-3.25-5.852-8.452-7.03-12.8c-.975-3.617-1.22-12.678-.447-16.335c2.723-12.76 12.353-21.659 26.25-24.3c4.51-.853 14.994-.528 19.424.569Z"></path></svg>
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