[ html canvas quadraticCurveTo ] canvas绘图quadraticCurveTo()属性研究实例演示之二

 1 <!DOCTYPE html>
 2 <html lang='zh-cn'>
 3 <head>
 4 <title>Insert you title</title>
 5 <meta name='description' content='this is my page'>
 6 <meta name='keywords' content='keyword1,keyword2,keyword3'>
 7 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 8 <link rel='stylesheet' type='text/css' href='./css/index.css' />
 9 <script type='text/javascript' src='./js/jquery-1.12.1.min.js'></script>
10 <style type='text/css'>
11 html,body {
12     margin: 0; padding: 0;
13 }
14 
15 html {
16     height: 100%;
17 }
18 
19 body {
20     background: #000;
21 }
22 
23 #can {
24     display: block; border-radius: 2px; margin: 25px auto; background: #FFF;
25 }
26 </style>
27 <script type='text/javascript'>
28     $( function(){
29         var oCan = $( '#can' ).get( 0 ).getContext( '2d' );
30         oCan.strokeStyle = '#000';
31         oCan.lineWidth = 2;
32         oCan.save();
33         oCan.moveTo(100,300);
34         oCan.quadraticCurveTo(30,70,400,150,50);
35         oCan.stroke();
36         oCan.restore();
37         /* 控制点位置 */
38         oCan.save();
39         oCan.beginPath();
40         oCan.strokeStyle = '#F00';
41         oCan.arc(100,300,2,0,2*Math.PI,false);
42         oCan.moveTo(100,300);
43         oCan.lineTo(30,70);
44         oCan.stroke();
45         oCan.closePath();
46         oCan.save();
47         oCan.beginPath();
48         oCan.strokeStyle = '#F90';
49         oCan.arc(30,70,2,0,2*Math.PI,false);
50         oCan.stroke();
51         oCan.closePath();
52         oCan.save();
53         oCan.beginPath();
54         oCan.strokeStyle = '#F9B';
55         oCan.arc(400,150,2,0,2*Math.PI,false);
56         oCan.stroke();
57         oCan.closePath();
58         oCan.moveTo(30,70);
59         oCan.lineTo(400,150);
60         oCan.stroke();
61         
62         
63         
64     } );
65 </script>
66 </head>
67 <body>
68     <canvas id='can' width='500' height='450'>您的浏览器版本过低,请升级您的浏览器以获取更好的使用体验...</canvas>
69 </body>
70 </html>

 

posted @ 2016-10-05 14:14  窗棂  Views(283)  Comments(0Edit  收藏  举报