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itszn/confetti.js

Created April 8, 2026 00:38
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Confetti
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confetti.js
// globals
var canvas;
var ctx;
var W;
var H;
var mp = 150; //max particles
var particles = [];
var angle = 0;
var tiltAngle = 0;
var confettiActive = true;
var animationComplete = true;
var deactivationTimerHandler;
var reactivationTimerHandler;
var animationHandler;
// objects
var particleColors = {
colorOptions: ["DodgerBlue", "OliveDrab", "Gold", "pink", "SlateBlue", "lightblue", "Violet", "PaleGreen", "SteelBlue", "SandyBrown", "Chocolate", "Crimson"],
colorIndex: 0,
colorIncrementer: 0,
colorThreshold: 10,
getColor: function () {
if (this.colorIncrementer >= 10) {
this.colorIncrementer = 0;
this.colorIndex++;
if (this.colorIndex >= this.colorOptions.length) {
this.colorIndex = 0;
}
}
this.colorIncrementer++;
return this.colorOptions[this.colorIndex];
}
}
function confettiParticle(color) {
this.x = Math.random() * W; // x-coordinate
this.y = (Math.random() * H) - H; //y-coordinate
this.r = RandomFromTo(10, 30); //radius;
this.d = (Math.random() * mp) + 10; //density;
this.color = color;
this.tilt = Math.floor(Math.random() * 10) - 10;
this.tiltAngleIncremental = (Math.random() * 0.07) + .05;
this.tiltAngle = 0;
this.draw = function () {
ctx.beginPath();
ctx.lineWidth = this.r / 2;
ctx.strokeStyle = this.color;
ctx.moveTo(this.x + this.tilt + (this.r / 4), this.y);
ctx.lineTo(this.x + this.tilt, this.y + this.tilt + (this.r / 4));
return ctx.stroke();
}
}
$(document).ready(function () {
SetGlobals();
//InitializeConfetti();
$(window).resize(function () {
W = window.innerWidth-10;
H = window.innerHeight-10;
canvas.width = W;
canvas.height = H;
});
});
function SetGlobals() {
canvas = document.getElementById("confetti-canvas");
ctx = canvas.getContext("2d");
W = window.innerWidth-10;
H = window.innerHeight-10;
canvas.width = W;
canvas.height = H;
}
function InitializeConfetti() {
particles = [];
animationComplete = false;
for (var i = 0; i < mp; i++) {
var particleColor = particleColors.getColor();
particles.push(new confettiParticle(particleColor));
}
StartConfetti();
}
function Draw() {
ctx.clearRect(0, 0, W, H);
var results = [];
for (var i = 0; i < mp; i++) {
(function (j) {
results.push(particles[j].draw());
})(i);
}
Update();
return results;
}
function RandomFromTo(from, to) {
return Math.floor(Math.random() * (to - from + 1) + from);
}
function Update() {
var remainingFlakes = 0;
var particle;
angle += 0.01;
tiltAngle += 0.1;
for (var i = 0; i < mp; i++) {
particle = particles[i];
if (animationComplete) return;
if (!confettiActive && particle.y < -15) {
particle.y = H + 100;
continue;
}
stepParticle(particle, i);
if (particle.y <= H) {
remainingFlakes++;
}
CheckForReposition(particle, i);
}
if (remainingFlakes === 0) {
StopConfetti();
}
}
function CheckForReposition(particle, index) {
if ((particle.x > W + 20 || particle.x < -20 || particle.y > H) && confettiActive) {
if (index % 5 > 0 || index % 2 == 0) //66.67% of the flakes
{
repositionParticle(particle, Math.random() * W, -10, Math.floor(Math.random() * 10) - 20);
} else {
if (Math.sin(angle) > 0) {
//Enter from the left
repositionParticle(particle, -20, Math.random() * H, Math.floor(Math.random() * 10) - 20);
} else {
//Enter from the right
repositionParticle(particle, W + 20, Math.random() * H, Math.floor(Math.random() * 10) - 20);
}
}
}
}
function stepParticle(particle, particleIndex) {
particle.tiltAngle += particle.tiltAngleIncremental;
particle.y += (Math.cos(angle + particle.d) + 3 + particle.r / 2) / 2;
particle.x += Math.sin(angle);
particle.tilt = (Math.sin(particle.tiltAngle - (particleIndex / 3))) * 15;
}
function repositionParticle(particle, xCoordinate, yCoordinate, tilt) {
particle.x = xCoordinate;
particle.y = yCoordinate;
particle.tilt = tilt;
}
function StartConfetti() {
W = window.innerWidth-10;
H = window.innerHeight-10;
canvas.width = W;
canvas.height = H;
(function animloop() {
if (animationComplete) return null;
animationHandler = requestAnimFrame(animloop);
return Draw();
})();
}
function ClearTimers() {
clearTimeout(reactivationTimerHandler);
clearTimeout(deactivationTimerHandler);
clearTimeout(animationHandler);
}
function DeactivateConfetti() {
confettiActive = false;
ClearTimers();
deactivationTimerHandler = setTimeout(function() {
StopConfetti();
ClearTimers();
},5000);
}
function StopConfetti() {
$('#confetti-canvas').hide();
animationComplete = true;
if (ctx == undefined) return;
ctx.clearRect(0, 0, W, H);
}
function RestartConfetti() {
ClearTimers();
StopConfetti();
$('#confetti-canvas').show();
reactivationTimerHandler = setTimeout(function () {
confettiActive = true;
animationComplete = false;
InitializeConfetti();
}, 100);
}
window.requestAnimFrame = (function () {
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function (callback) {
return window.setTimeout(callback, 1000 / 60);
};
})();
let ConfettiManager = {
start: RestartConfetti,
stop: StopConfetti,
end: DeactivateConfetti,
drop: (t=2000) => {
RestartConfetti();
setTimeout(DeactivateConfetti, t);
}
}
window.ConfettiManager = ConfettiManager;
export {ConfettiManager};
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