canvas getContext对象方法和属性详细介绍(2)_H5之家

<html> <head> <title>A canvas lineCap example</title> <meta name="DC.creator" content="Kamiel Martinet, "> <meta name="DC.publisher" content="Mozilla Developer Center, "> <script type="application/x-javascript"> function draw() { var ctx = document.getElementById('canvas').getContext('2d'); var lineCap = ['butt','round','square']; // Draw guides ctx.strokeStyle = '#09f'; ctx.beginPath(); ctx.moveTo(10,10); ctx.lineTo(140,10); ctx.moveTo(10,140); ctx.lineTo(140,140); ctx.stroke(); // Draw lines ctx.strokeStyle = 'black'; for (i=0;i<lineCap.length;i++){ ctx.lineWidth = 15; ctx.lineCap = lineCap[i]; ctx.beginPath(); ctx.moveTo(25+i*50,10); ctx.lineTo(25+i*50,140); ctx.stroke(); } } </script> <style type="text/css"> body { margin: 20px; font-family: arial,verdana,helvetica; background: #fff;} h1 { font-size: 140%; font-weight:normal; color: #036; border-bottom: 1px solid #ccc; } canvas { float: left; margin-right: 20px; margin-bottom: 20px; } pre { float:left; display:block; background=\'#\'" border: 1px dashed #666; padding: 15px 20px; margin: 0 0 10px 0; } </style> </head> <body <h1>A canvas <code>lineCap</code> example</h1> <div> <canvas id="canvas" width="150" height="150"></canvas> <pre> function draw() { var ctx = document.getElementById('canvas').getContext('2d'); var lineCap = ['butt','round','square']; // Draw guides ctx.strokeStyle = '#09f'; ctx.beginPath(); ctx.moveTo(10,10); ctx.lineTo(140,10); ctx.moveTo(10,140); ctx.lineTo(140,140); ctx.stroke(); // Draw lines ctx.strokeStyle = 'black'; for (i=0;i<lineCap.length;i++){ ctx.lineWidth = 15; ctx.lineCap = lineCap[i]; ctx.beginPath(); ctx.moveTo(25+i*50,10); ctx.lineTo(25+i*50,140); ctx.stroke(); } } </pre> </div> </body> </html>

运行效果图如下：

canvas getContext对象方法和属性详细介绍

11.miterLimit 该属性定义了斜连线长度和线条宽度的最大比率，这个属性只有当lineJoin='miter' 时才有效。

例子如下：