Created
December 9, 2011 00:21
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Some code to create a grid using the <canvas> tag. Also animates the grid.
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8" /> | |
| <title>Grid!</title> | |
| <!--[if IE]> | |
| <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script> | |
| <![endif]--> | |
| <script> | |
| var t = 0; | |
| window.onload = function(){ | |
| var canvas = document.getElementById("canvas"); | |
| var c = canvas.getContext("2d"); | |
| setInterval(function () { | |
| t++; | |
| clearCanvas(canvas); | |
| var stretch = Math.sin(t/5) * 10; | |
| drawGrid (canvas, "#FF00FF", 40, 40 , 20 + stretch, 30 + t); | |
| }, 50); | |
| }; | |
| function clearCanvas(canvas) { | |
| var c = canvas.getContext("2d"); | |
| c.beginPath(); | |
| c.rect(0,0,800,450); | |
| c.fillStyle = "#000000"; | |
| c.fill(); | |
| } | |
| function drawGrid (canvas, color, xSpacing, ySpacing, xOffset, yOffset, lineWidth) { | |
| var width = parseInt(canvas.getAttribute("width")); | |
| var height = parseInt(canvas.getAttribute("height")); | |
| var c = canvas.getContext("2d"); | |
| var x = xOffset % xSpacing || 0; | |
| var y = yOffset % ySpacing || 0; | |
| lineWidth = lineWidth || 1; | |
| c.beginPath(); | |
| while (x < width) { | |
| c.moveTo(x,0); | |
| c.lineTo(x,height); | |
| x += xSpacing; | |
| } | |
| while (y < height) { | |
| c.moveTo(0,y); | |
| c.lineTo(width, y); | |
| y += ySpacing; | |
| } | |
| c.lineWidth = lineWidth; | |
| c.strokeStyle = color; | |
| c.stroke(); | |
| } | |
| </script> | |
| </head> | |
| <body> | |
| <canvas id="canvas" width="800" height="450" /> | |
| </body> | |
| </html> |
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