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solution-canvas-animation
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| const canvas = document.querySelector('#canvas'); | |
| const ctx = canvas.getContext('2d'); | |
| const cWidth = canvas.width; | |
| const cHeight = canvas.height; | |
| let speed1 = 300; | |
| let speed2 = 300; | |
| let speed3 = 300; | |
| function clearCanvas() { | |
| ctx.clearRect(0, 0, cWidth, cHeight); | |
| } | |
| function drawCanvas(x, y, w, h, color) { | |
| ctx.fillStyle = color; | |
| ctx.fillRect(x, y, w, h); | |
| } | |
| function updateCanvas() { | |
| speed1 -= 1; | |
| speed2 -= 2; | |
| speed3 -= 3; | |
| // clear the canvas | |
| clearCanvas(); | |
| // redraw the canvas | |
| // drawCanvas(x, y, width, height, "color"); | |
| drawCanvas(50, speed1, 50, 50, 'red'); | |
| drawCanvas(150, speed2, 50, 50, 'green'); | |
| drawCanvas(250, speed3, 50, 50, 'yellow'); | |
| requestAnimationFrame(updateCanvas); | |
| } | |
| updateCanvas(); |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8" /> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0" /> | |
| <meta http-equiv="X-UA-Compatible" content="ie=edge" /> | |
| <title>Canvas Animations</title> | |
| </head> | |
| <body> | |
| <canvas id="canvas" width="300" height="300"></canvas> | |
| <!-- add js file in the end when the DOM is already loaded --> | |
| <script src="index.js"></script> | |
| </body> | |
| </html> |
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