复习去年一个晚自习跟着视频做的canvas绘图

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##静态七巧板
个人感觉canvas绘图有种小学信息技术课上学的pc logo的感觉

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<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title>七巧板</title>
</head>
<body>
	<canvas id="canvas" width="400" height="400" style="border:2px solid black;display:block;margin: 0 auto;"></canvas><!--这里是画图的区域-->
	<script type="text/javascript">
		var tangram=[
			{p:[{x:0,y:0},{x:100,y:100},{x:100,y:300},{x:0,y:200}],color:"rgb(229,0,205)"},
			{p:[{x:0,y:0},{x:200,y:200},{x:400,y:0}],color:"rgb(237,129,31)"},
			{p:[{x:100,y:100},{x:200,y:200},{x:100,y:300}],color:"rgb(1,64,229)"},
			{p:[{x:0,y:200},{x:200,y:400},{x:0,y:400}],color:"rgb(14,160,15)"},
			{p:[{x:100,y:300},{x:200,y:200},{x:300,y:300},{x:200,y:400}],color:"rgb(0,228,165)"},
			{p:[{x:400,y:0},{x:400,y:400},{x:200,y:200}],color:"rgb(105,188,232)"},
			{p:[{x:200,y:400},{x:400,y:400},{x:300,y:300}],color:"rgb(233,229,0)"}
			]//定义一个数组里面装着每一块板的颜色和顶点的坐标
		window.onload=function()
		{
			var canvas=document.getElementById('canvas');
			var context=canvas.getContext('2d');//设置一块二维画布
			for (var i = 0;i<tangram.length;i++) 
			{
				draw(tangram[i],context);
			}
		}	
			function draw(arr,con)
			{
				con.beginPath();//开始绘制
				con.moveTo(arr.p[0].x,arr.p[0].y);//初始点
				for (var i=1;i<arr.p.length;i++)
					{
						con.lineTo(arr.p[i].x,arr.p[i].y);//依次绘制到各个坐标
					}
				con.closePath();//结束绘制,并将不封闭的图形自行封闭
				
				con.fillStyle=arr.color; //填充样式
				con.fill();//填充
				con.strokeStyle="black";//线条样式
				con.lineWidth="3px";//线条粗细
				con.stroke();//画线
			}//去年花了1节晚自习跟着视频写成，现在重新看感觉又不会了，于是通过笔记加上了一点注释（突然理解了组长让我们在代码中加注释的原因）
	</script>
</body>
</html>