用 HTML5 Canvas 创建图案
使用以下方法用 HTML5 Canvas 创建图案:createPattern(图像,重复)- 该方法将使用图像创建图案。第二个参数可以是一个字符串,其值之一:repeat、repeat-x、repeat-y 和 no-repeat。如果指定空字符串或空值,则重复将被认为是。示例
示例
你可以尝试运行以下代码来了解如何创建图案 −
<!DOCTYPE HTML> <html> <head> <style> #test { width:100px; height:100px; margin: 0px auto; } </style> <script> function drawShape(){ // get the canvas element using the DOM var canvas = document.getElementById('mycanvas'); // Make sure we don't execute when canvas isn't supported if (canvas.getContext){ // use getContext to use the canvas for drawing var ctx = canvas.getContext('2d'); // create new image object to use as pattern var img = new Image(); img.src = 'images/pattern.jpg'; img.onload = function(){ // create pattern var ptrn = ctx.createPattern(img,'repeat'); ctx.fillStyle = ptrn; ctx.fillRect(0,0,150,150); } } else { alert('You need Safari or Firefox 1.5+ to see this demo.'); } } </script> </head> <body id = "test" onload = "drawShape();"> <canvas id = "mycanvas"></canvas> </body> </html>
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