Created
July 22, 2024 17:09
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Fun canvas confetti component
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import React, { useEffect, useRef } from "react"; | |
interface ConfettiParticle { | |
x: number; | |
y: number; | |
r: number; | |
d: number; | |
color: string; | |
tilt: number; | |
tiltAngleIncremental: number; | |
tiltAngle: number; | |
draw: (context: CanvasRenderingContext2D) => void; | |
} | |
const ConfettiComponent: React.FC = () => { | |
const canvasRef = useRef<HTMLCanvasElement>(null); | |
const particles = useRef<ConfettiParticle[]>([]); | |
const maxConfettis = 150; | |
const possibleColors = [ | |
"DodgerBlue", | |
"OliveDrab", | |
"Gold", | |
"Pink", | |
"SlateBlue", | |
"LightBlue", | |
"Gold", | |
"Violet", | |
"PaleGreen", | |
"SteelBlue", | |
"SandyBrown", | |
"Chocolate", | |
"Crimson" | |
]; | |
const randomFromTo = (from: number, to: number): number => { | |
return Math.floor(Math.random() * (to - from + 1) + from); | |
}; | |
class Particle implements ConfettiParticle { | |
x: number; | |
y: number; | |
r: number; | |
d: number; | |
color: string; | |
tilt: number; | |
tiltAngleIncremental: number; | |
tiltAngle: number; | |
constructor() { | |
this.x = Math.random() * window.innerWidth; | |
this.y = Math.random() * window.innerHeight - window.innerHeight; | |
this.r = randomFromTo(11, 33); | |
this.d = Math.random() * maxConfettis + 11; | |
this.color = possibleColors[Math.floor(Math.random() * possibleColors.length)]; | |
this.tilt = Math.floor(Math.random() * 33) - 11; | |
this.tiltAngleIncremental = Math.random() * 0.07 + 0.05; | |
this.tiltAngle = 0; | |
} | |
draw(context: CanvasRenderingContext2D) { | |
context.beginPath(); | |
context.lineWidth = this.r / 2; | |
context.strokeStyle = this.color; | |
context.moveTo(this.x + this.tilt + this.r / 3, this.y); | |
context.lineTo(this.x + this.tilt, this.y + this.tilt + this.r / 5); | |
context.stroke(); | |
} | |
} | |
useEffect(() => { | |
const canvas = canvasRef.current; | |
if (!canvas) return; | |
const context = canvas.getContext("2d"); | |
if (!context) return; | |
const draw = () => { | |
context.clearRect(0, 0, window.innerWidth, window.innerHeight); | |
particles.current.forEach((particle) => particle.draw(context)); | |
particles.current.forEach((particle, i) => { | |
particle.tiltAngle += particle.tiltAngleIncremental; | |
particle.y += (Math.cos(particle.d) + 3 + particle.r / 2) / 2; | |
particle.tilt = Math.sin(particle.tiltAngle - i / 3) * 15; | |
if (particle.x > window.innerWidth + 30 || particle.x < -30 || particle.y > window.innerHeight) { | |
particle.x = Math.random() * window.innerWidth; | |
particle.y = -30; | |
particle.tilt = Math.floor(Math.random() * 10) - 20; | |
} | |
}); | |
requestAnimationFrame(draw); | |
}; | |
const handleResize = () => { | |
canvas.width = window.innerWidth; | |
canvas.height = window.innerHeight; | |
}; | |
window.addEventListener("resize", handleResize); | |
handleResize(); | |
particles.current = []; | |
for (let i = 0; i < maxConfettis; i++) { | |
particles.current.push(new Particle()); | |
} | |
draw(); | |
return () => { | |
window.removeEventListener("resize", handleResize); | |
}; | |
}, []); | |
return <canvas ref={canvasRef} />; | |
}; | |
export default ConfettiComponent; |
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