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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| let W = window.innerWidth; | ||
| let H = window.innerHeight; | ||
| const canvas = document.getElementById("canvas"); | ||
| const context = canvas.getContext("2d"); | ||
| const maxConfettis = 150; | ||
| const particles = []; | ||
|
|
||
| const possibleColors = [ | ||
| "DodgerBlue", | ||
| "OliveDrab", | ||
| "Gold", | ||
| "Pink", | ||
| "SlateBlue", | ||
| "LightBlue", | ||
| "Gold", | ||
| "Violet", | ||
| "PaleGreen", | ||
| "SteelBlue", | ||
| "SandyBrown", | ||
| "Chocolate", | ||
| "Crimson" | ||
| ]; | ||
|
|
||
| function randomFromTo(from, to) { | ||
| return Math.floor(Math.random() * (to - from + 1) + from); | ||
| } | ||
|
|
||
| function confettiParticle() { | ||
| this.x = Math.random() * W; // x | ||
| this.y = Math.random() * H - H; // y | ||
| this.r = randomFromTo(11, 33); // radius | ||
| 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; | ||
|
|
||
| this.draw = function() { | ||
| 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); | ||
| return context.stroke(); | ||
| }; | ||
| } | ||
|
|
||
| function Draw() { | ||
| const results = []; | ||
|
|
||
| // Magical recursive functional love | ||
| requestAnimationFrame(Draw); | ||
|
|
||
| context.clearRect(0, 0, W, window.innerHeight); | ||
|
|
||
| for (var i = 0; i < maxConfettis; i++) { | ||
| results.push(particles[i].draw()); | ||
| } | ||
|
|
||
| let particle = {}; | ||
| let remainingFlakes = 0; | ||
| for (var i = 0; i < maxConfettis; i++) { | ||
| particle = particles[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.y <= H) remainingFlakes++; | ||
|
|
||
| // If a confetti has fluttered out of view, | ||
| // bring it back to above the viewport and let if re-fall. | ||
| if (particle.x > W + 30 || particle.x < -30 || particle.y > H) { | ||
| particle.x = Math.random() * W; | ||
| particle.y = -30; | ||
| particle.tilt = Math.floor(Math.random() * 10) - 20; | ||
| } | ||
| } | ||
|
|
||
| return results; | ||
| } | ||
|
|
||
| window.addEventListener( | ||
| "resize", | ||
| function() { | ||
| W = window.innerWidth; | ||
| H = window.innerHeight; | ||
| canvas.width = window.innerWidth; | ||
| canvas.height = window.innerHeight; | ||
| }, | ||
| false | ||
| ); | ||
|
|
||
| // Push new confetti objects to `particles[]` | ||
| for (var i = 0; i < maxConfettis; i++) { | ||
| particles.push(new confettiParticle()); | ||
| } | ||
|
|
||
| // Initialize | ||
| canvas.width = W; | ||
| canvas.height = H; | ||
| Draw(); |
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