canvas画线段

最新推荐文章于 2024-09-14 17:22:26 发布

elegancy_

最新推荐文章于 2024-09-14 17:22:26 发布

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本文介绍如何使用HTML Canvas元素和JavaScript绘制直线，包括获取画布、创建2D绘图环境、设置线条宽度、线帽样式、绘制直线并关闭路径。

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>canvas</title>
<style>
body{
    background:#808080;
}
#canvas{
    background:#FFFFFF;
}
</style>
<script>
   window.onload = function(){
       //获取canvas画布
       var canvas = document.getElementById('canvas');
       //获取2d绘图环境
       cxt = canvas.getContext('2d');
        
        //画直线线段
        cxt.lineWidth = 20;
        //cxt.lineCap = 'square';
        cxt.lineCap = 'round';

        cxt.moveTo(100,100);
        cxt.lineTo(200,200);

        cxt.stroke();
   }
</script>
</head>
<body>
<canvas id="canvas" width="500" height="500"></canvas>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>canvas</title>
<style>
body{
    background:#808080;
}
#canvas{
    background:#FFFFFF;
}
</style>
<script>
   window.onload = function(){
       //获取canvas画布
       var canvas = document.getElementById('canvas');
       //获取2d绘图环境
       var cxt = canvas.getContext('2d');

       //画直线
       cxt.beginPath();
       cxt.lineWidth = 20;
       cxt.strokeStyle = 'red';
       cxt.moveTo(100,100);
       cxt.lineTo(200,200);
       cxt.lineCap = 'round';
       cxt.stroke();
       cxt.closePath();
   } 
</script>
</head>
<body>
<canvas id="canvas" width="500" height="500"></canvas>
</body>
</html>

效果图：