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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