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这次小练习只是简单实验canvas元素的使用,用到了路径的使用和填充,
简单的moveTo lineTo的重复绘制直线,最后stroke填充
<!DOCTYPE html>
<html>
<head>
<title>折线图</title>
</head>
<body>
<canvas id="mc" width="500" height="400" style="border:1px solid black"></canvas>
<script type="text/javascript">
var canvas=document.getElementById('mc');
var ctx=canvas.getContext('2d');
//坐标轴
ctx.moveTo(30,20);
ctx.lineWidth="1";
ctx.lineTo(30,380);
ctx.lineTo(400,380);
//横线
ctx.strokeStyle="#999";
for(var i=0;i<7;i++)
{
ctx.moveTo(30,30+50*i);
ctx.lineTo(400,30+50*i);
}
//折线
ctx.moveTo(100,300);
ctx.lineTo(200,200);
ctx.lineTo(280,280);
ctx.lineTo(380,30);
ctx.stroke();
</script>
</body>
</html>
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转播
