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HTML5's canvas implementation draws simple rectangles and triangles

不言
不言Original
2018-06-22 15:05:502015browse

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(&#39;demo&#39;).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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