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[ 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=http://www.mamicode.com/‘./css/index.css‘ />"color: #008080;"> 9 <script type=‘text/javascript‘ src=http://www.mamicode.com/‘./js/jquery-1.12.1.min.js‘></script>"color: #008080;">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>

 

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