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| <html> | |
| <head> | |
| <title>Canvas Boilerplate</title> | |
| <style type="text/css"> | |
| *,html{ | |
| margin: 0;padding: 0; | |
| } | |
| canvas { | |
| width: 100%; | |
| height: 100%; | |
| } | |
| </style> | |
| </head> | |
| <body onload="setup();"> | |
| <canvas id="canvas"></canvas> | |
| <script type="text/javascript"> | |
| /* GLOBAL */ | |
| window.requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame || window.msRequestAnimationFrame; | |
| var global_width = window.innerWidth, | |
| global_height = window.innerHeight, | |
| ratio = 1, | |
| canvas = document.getElementById('canvas'), | |
| ctx = canvas.getContext('2d'); | |
| /* SETUP */ | |
| function setup(){ | |
| if (ctx){ | |
| init(); | |
| requestAnimationFrame(update); | |
| window.addEventListener('resize', rescale); | |
| rescale(); | |
| } | |
| } | |
| function rescale(){ | |
| global_width = window.innerWidth; | |
| global_height = window.innerHeight; | |
| if(ctx.webkitBackingStorePixelRatio < 2) ratio = window.devicePixelRatio || 1; | |
| canvas.setAttribute('width', global_width*ratio); | |
| canvas.setAttribute('height', global_height*ratio); | |
| draw(); | |
| } | |
| /* INIT */ | |
| function init(){ | |
| draw(); | |
| } | |
| /* DRAW */ | |
| function drawExample(){ | |
| ctx.lineWidth = 6; | |
| ctx.strokeStyle = "#333"; | |
| ctx.beginPath(); | |
| ctx.moveTo((global_width/2)-200, (global_height/2)-200); | |
| ctx.bezierCurveTo(150, 100, 350, 100, 400, 250); | |
| ctx.stroke(); | |
| } | |
| function draw(){ | |
| ctx.save(); | |
| ctx.scale(ratio, ratio); | |
| // Execute your draw specific functions between the lines to enable high-dpi drawing | |
| // --------------------------------------------------------------------------------- | |
| drawExample(); | |
| // --------------------------------------------------------------------------------- | |
| ctx.restore(); | |
| } | |
| /* UPDATE */ | |
| function update(){ | |
| requestAnimationFrame(update); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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