[ html canvas 旋转 缩放 平移 ] canvas绘图实现旋转复制实例演示 

<!DOCTYPE html>
<html lang='zh-cn'>
<head>
<title>Insert you title</title>
<meta name='description' content='this is my page'>
<meta name='keywords' content='keyword1,keyword2,keyword3'>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link rel='stylesheet' type='text/css' href='./css/index.css' />
<script type='text/javascript' src='./js/jquery-1.12.1.min.js'></script>
<style type='text/css'>
html,body {
    margin: 0; padding: 0;
}

html {
    background: #999;
}

canvas {
    background: #FFF; display: block; margin: 75px auto; border-radius: 2px;
}
</style>
<script type='text/javascript'>
    $( function(){
        var oCan = $( '#can' ).get( 0 ).getContext( '2d' );
        oCan.beginPath();
        oCan.stokeStyle = '#F00';
        oCan.translate( 250 , 250 ); /* 将后绘制出的图形进行平移 */
        for( var i = 0 ; i < 50 ; i++ ){
            oCan.rotate( 35 * Math.PI / 180 ); /* 将后绘制出的图形进行旋转 */
            oCan.scale( 0.9 , 0.7 ); /* 将后绘制出的图形进行缩放 */
            oCan.fillRect( 200 , 150 , 50 , 30 ); /* 实现旋转复制效果 */
            oCan.closePath();
        }
    } );
</script>
</head>
<body>
    <canvas id='can' width='500' height='500'>您的浏览器版本过低,请升级您的浏览器,以获取更好的用户体验...</canvas>
</body>
</html>

 

posted @ 2016-08-14 09:22  窗棂  Views(610)  Comments(0)  Edit  收藏  举报