Falling Confetti
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Falling Confetti</title>
<style>
/*
Falling confetti animation
--------------------------
This page draws a shower of confetti using the HTML5 canvas. Each
piece of confetti is represented by a small circle whose colour and
drift are chosen at random. As the pieces fall they oscillate left
and right to give the impression of air resistance. When they
leave the bottom of the screen they are recycled at the top.
*/
html, body {
margin: 0;
padding: 0;
height: 100%;
overflow: hidden;
background: #0c0c0c;
font-family: sans-serif;
}
canvas {
display: block;
}
</style>
</head>
<body>
<canvas id="confetti"></canvas>
<script>
(function() {
const canvas = document.getElementById('confetti');
const ctx = canvas.getContext('2d');
// Resize the canvas to fill the window.
function resize() {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
}
window.addEventListener('resize', resize);
resize();
// List of pastel colours. These hues are similar to those used in
// the original CodePen; they provide a cheerful, celebratory look.
const colours = [
'#ff5978', '#ff9b44', '#f6d743', '#54c571', '#57c7ff', '#b18fff'
];
// Number of confetti pieces. Increase for denser showers at the
// expense of frame rate.
const COUNT = 150;
// Confetti particle definition.
class Confetto {
constructor() {
this.reset();
}
reset() {
this.x = Math.random() * canvas.width;
this.y = -10 - Math.random() * canvas.height;
this.size = 6 + Math.random() * 6;
this.speed = 1 + Math.random() * 2;
this.wave = 50 + Math.random() * 50;
this.phase = Math.random() * Math.PI * 2;
this.col = colours[Math.floor(Math.random() * colours.length)];
}
update(dt) {
// Vertical motion
this.y += this.speed * dt;
// Horizontal oscillation
this.x += Math.sin(this.phase + this.y / this.wave) * 0.5;
// When the piece falls past the bottom, recycle it at the top.
if (this.y > canvas.height + this.size) {
this.reset();
this.y = -this.size;
}
}
draw(ctx) {
ctx.fillStyle = this.col;
ctx.beginPath();
ctx.arc(this.x, this.y, this.size, 0, Math.PI * 2);
ctx.fill();
}
}
// Create the confetti.
const confetti = [];
for (let i = 0; i < COUNT; i++) {
confetti.push(new Confetto());
}
// Track time between frames for consistent motion across
// different refresh rates.
let lastTime = null;
function tick(timestamp) {
if (!lastTime) lastTime = timestamp;
const dt = (timestamp - lastTime) / 16.666; // relative to ~60fps
lastTime = timestamp;
ctx.clearRect(0, 0, canvas.width, canvas.height);
// Draw a subtle gradient background for depth.
const grad = ctx.createLinearGradient(0, 0, 0, canvas.height);
grad.addColorStop(0, '#151515');
grad.addColorStop(1, '#0a0a0a');
ctx.fillStyle = grad;
ctx.fillRect(0, 0, canvas.width, canvas.height);
// Update and render each piece of confetti.
for (const piece of confetti) {
piece.update(dt);
piece.draw(ctx);
}
requestAnimationFrame(tick);
}
requestAnimationFrame(tick);
})();
</script>
</body>
</html>About this animation
Celebratory falling confetti pieces.
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