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This article mainly introduces the canvas implementation of HTML5 to draw simple rectangles and triangles. It has a certain reference value. Now I share it with you. Friends in need can refer to it.
There are two forms , one is stroke (fill), and the other is filling (stroke). The specific implementation code is as follows. Friends who are interested can refer to it. I hope it will be helpful to everyone.
First, place a canvas element in the html page, where the canvas element should have three attributes: ID, width, and height.
<canvas id="demo" width="600" height="600"></canvas>
Get the canvas object and get the context var cxt=document.getElementById('demo').getContext("2d"); where the parameter 2d is determined.
Start drawing. There are two forms, one is fill and the other is stroke.
javascript code:
<script language="javascript"> var cxt=document.getElementById('demo').getContext("2d"); cxt.beginPath(); cxt.fillStyle="#F00";/*设置填充颜色*/ cxt.fillRect(0,0,200,100);/*绘制一个矩形,前两个参数决定开始位置,后两个分别是矩形的宽和高*/ cxt.beginPath(); cxt.strokeStyle="#000";/*设置边框*/ cxt.lineWidth=3;/*边框的宽度*/ cxt.strokeRect(0,120,200,100); cxt.beginPath(); cxt.moveTo(0,350); cxt.lineTo(100,250); cxt.lineTo(200,300); cxt.closePath();/*可选步骤,关闭绘制的路径*/ cxt.stroke(); </script>
Rendering:
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