Created
February 23, 2024 13:54
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This code will generate some stripes on an HTML page simulating what I saw on a Jackbox game background. Very cool.
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<!DOCTYPE html> | |
<html> | |
<head> | |
<title>Animated Canvas Diagonal Stripes</title> | |
<style> | |
body { | |
margin: 0; | |
overflow: hidden; | |
} | |
canvas { | |
display: block; | |
} | |
</style> | |
</head> | |
<body> | |
<canvas id="myCanvas"></canvas> | |
<script> | |
const canvas = document.getElementById('myCanvas'); | |
const ctx = canvas.getContext('2d'); | |
const COLORS = ['#FF0000', '#00FF00', '#0000FF', '#FFFF00', '#FF00FF', '#00FFFF']; | |
const STRIPE_COUNT = 10; | |
const MIN_OPACITY = 0.1; | |
const MAX_OPACITY = 0.8; | |
const STRIPE_WIDTH = 120; // Adjust stripe width as needed | |
const SKEW = 0.1; | |
const LINE_SPEED = 0.5; // Pixels per frame, adjust for speed | |
const bgStripes = []; | |
const stripes = []; | |
const LEFT_BOUNDARY = 0 - STRIPE_WIDTH; | |
const RIGHT_BOUNDARY = window.innerWidth + STRIPE_WIDTH + (canvas.width * SKEW); | |
// Full screen canvas | |
canvas.width = window.innerWidth; | |
canvas.height = window.innerHeight; | |
function drawStripe(stripe) { | |
ctx.beginPath(); | |
ctx.moveTo(stripe.x, stripe.y); | |
ctx.lineTo(stripe.x + (canvas.width * SKEW), stripe.y + (1.4 * canvas.height)); | |
ctx.strokeStyle = `rgba(${parseInt(stripe.color.slice(1, 3), 16)}, ${parseInt(stripe.color.slice(3, 5), 16)}, ${parseInt(stripe.color.slice(5, 7), 16)}, ${stripe.opacity})`; | |
ctx.lineWidth = STRIPE_WIDTH; | |
ctx.stroke(); | |
} | |
function generateFixedStripes() { | |
let x = LEFT_BOUNDARY; | |
while (x < RIGHT_BOUNDARY) { | |
console.log({ x: x }) | |
const color = COLORS[Math.floor(Math.random() * COLORS.length)]; | |
// const opacity = Math.random() * (MAX_OPACITY - MIN_OPACITY) + MIN_OPACITY; | |
const opacity = MAX_OPACITY; | |
const y = canvas.height * (-0.2); | |
bgStripes.push({ x, y, opacity: 1, color, direction: 0 }) | |
x = x + STRIPE_WIDTH; | |
} | |
} | |
function generateMovingStripes() { | |
for (let i = 0; i < STRIPE_COUNT; i++) { | |
const color = COLORS[Math.floor(Math.random() * COLORS.length)]; | |
const opacity = Math.random() * (MAX_OPACITY - MIN_OPACITY) + MIN_OPACITY; | |
const x = Math.random() * (canvas.width * 1.3) - (0.5 * canvas.width); | |
const y = canvas.height * (-0.2); | |
const direction = Math.random() > 0.5 ? 1 : -1; // Randomly choose a direction | |
stripes.push({ x, y, opacity, color, direction }); | |
} | |
} | |
function updateAndDrawStripes() { | |
ctx.clearRect(0, 0, canvas.width, canvas.height); // Clear the canvas | |
bgStripes.forEach(stripe => { | |
drawStripe(stripe); | |
}) | |
stripes.forEach(stripe => { | |
if (stripe.x > RIGHT_BOUNDARY || stripe.x < LEFT_BOUNDARY) { | |
stripe.direction = stripe.direction * -1; | |
} | |
stripe.x += LINE_SPEED * stripe.direction; // Update position based on direction and speed | |
drawStripe(stripe); | |
}); | |
requestAnimationFrame(updateAndDrawStripes); | |
} | |
generateFixedStripes(); | |
generateMovingStripes(); | |
requestAnimationFrame(updateAndDrawStripes); | |
</script> | |
</body> | |
</html> |
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