日期:2014-05-16 浏览次数:20387 次
用Javascript画线的方法很多,有SVG,VML、canvas等,但是在现阶段,貌似这些方法都不能兼容所有浏览器。所以我还是用最原始的办法法写了一个画线方法。思路也很简单,就是用一个像素的DIV拼成一条线。
function line(startX, startY, endX, endY, container) { if (startX == endX) { if (startY > endY) { var tempY = startY; startY = endY; endY = tempY; } for (var k = startY; k < endY; k++) { createPoint(container, startX, k); } } // y = ax + b var a = (startY - endY) / (startX - endX); var b = startY - ((startY - endY) / (startX - endX)) * startX; if (Math.abs(startX - endX) > Math.abs(startY - endY)) { if (startX > endX) { var tempX = endX; endX = startX; startX = tempX; } var left = container.style.left; var top = container.style.top; for (var i = startX; i <= endX; i++) { createPoint(container, i, a * i + b); } } else { if (startY > endY) { var tempY = startY; startY = endY; endY = tempY; } for (var j = startY; j <= endY; j++) { createPoint(container, (j - b) / a, j); } } } function createPoint(container, x, y) { var node = document.createElement('div'); node.className = 'line'; node.style.marginTop = y; node.style.marginLeft = x; container.appendChild(node); }
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当然还需要一段CSS来控制样式:
div.line { position:absolute; z-index:2; width:1px; height:1px; font-size:1px; background-color:#0000FF; overflow:hidden; }
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来一段HTML测试一下
<html> <head> <script type="text/javascript" src="../js/jsline.js"></script> <script type="text/javascript"> function testLine() { line(1, 2, 88, 88, document.getElementById('container')); } </script> </head> <body> <div id="container" style="width:400px;height:400px;border:1px solid #000000;margin-left:50px"></div> <input type="button" value="line" onclick="testLine();"></input> </body> </html>
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最后还是希望HTML5早日普及,我这种写法早日淘汰!