canvas绘制七巧板

Posted 2020-10-24 mhxy13867806343

不满足于CSS对颜色的控制，使用html5画布功能绘制了一张漂亮的五彩图片，以下代码，复制粘贴进一个格式为HTML的文档即可见。

<canvas id="canvas"style="border:5px solid #ccc;display: block;margin:0 auto;"></canvas>

　　

 1 <script type="text/javascript">
 2 var tangtam=[
 3 {p:[{x:0,y:0},{x:800,y:0},{x:400,y:400}],color:"#caff67"},
 4 {p:[{x:0,y:0},{x:400,y:400},{x:0,y:800}],color:"#67becf"},
 5 {p:[{x:800,y:0},{x:800,y:400},{x:600,y:600},{x:600,y:200}],color:"#ef3d61"},
 6 {p:[{x:600,y:200},{x:600,y:600},{x:400,y:400}],color:"#f9f51a"},
 7 {p:[{x:400,y:400},{x:600,y:600},{x:400,y:800},{x:200,y:600}],color:"#a594c0"},
 8 {p:[{x:200,y:600},{x:400,y:800},{x:0,y:800}],color:"#fa8ecc"},
 9 {p:[{x:800,y:400},{x:800,y:800},{x:400,y:800}],color:"#f6ca29"}
10 ]
11 window.onload=function(){
12 var canvas=document.getElementById("canvas");
13 // 定义画布大小必须申明变量后就进行设置
14 canvas.width = 800;
15 canvas.height = 800;
16 
17 var context=canvas.getContext("2d");
18 for(var i=0;i<tangtam.length;i++){
19 draw(tangtam[i],context);
20 }
21 
22 //判断浏览器对canvas的支持 canvas是基于状态的绘制
23 // var canvas=document.getElementById("canvas");
24 // if(canvas.getContext("2d")){
25 // var canvas=canvas.getContext("2d");
26 // }else{
27 // alert("当前浏览器不支持canvas，请更换浏览器再尝试")
28 // }
29 }
30 function draw(piece,cxt){
31 cxt.beginPath();
32 cxt.moveTo(piece.p[0].x,piece.p[0].y);
33 for(var i=1;i<piece.p.length;i++){
34 cxt.lineTo(piece.p[i].x,piece.p[i].y);
35 }
36 cxt.closePath();
37 cxt.fillStyle=piece.color;
38 cxt.fill();
39 }
40 </script>