网页中图片旋转的几种实现方式

来源：互联网发布：淘宝在线登录编辑：程序博客网时间：2024/05/19 22:51

原文章地址：http://biancheng.dnbcw.info/javascript/427943.html

网页中图片旋转一般有下面三种常见的实现方式：

一、 ie 滤镜

IE的图形旋转滤镜，通过指定BasicImage滤镜的rotation值旋转元素，旋转方向为顺时针，旋转的中心点为元素的左上角。rotation可以有4个旋转值：0, 1, 2,和3分别表示将元素旋转0度、90度、180度、270度。

浏览器支持： IE5.5+

CSS代码：

.rotate{ filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=3); }

JS代码：

element.style.filter = "progid:DXImageTransform.Microsoft.BasicImage(rotation=3)";

IE滤镜旋转演示：

<!DOCTYPE html><html><head><meta charset="utf-8" /><title>ie-filter-rotate</title></head><body><div  id="odiv" style="position:absolute; left:270px; top:45px;" ><a href="http://s.click.taobao.com/t_8?e=7HZ6jHSTbIWYKA1Nkch%2BmIw66j0vo3r3FmWt1QTQz2JsyA%3D%3D&p=mm_10844584_0_0"><img style="border:none" src='http://img1.gtimg.com/digi/pics/hv1/72/143/1111/72279312.jpg' /></a></div><p style="line-height:1.5em"><button onclick="rotate()"> rotate</button> <button onclick="odiv.style.filter=''">clear filter</button>    <a href="http://s.click.taobao.com/t_8?e=7HZ6jHSTbIWYKA1Nkch%2BmIw66j0vo3r3FmWt1QTQz2JsyA%3D%3D&p=mm_10844584_0_0">三星 galaxy note 10.1</a> <br /><span id="info">rotation=0，旋转0度</span></p><br/><script>var i=0;function rotate(){var oDiv = document.getElementById("odiv");if( !document.body.filters ){alert("这个浏览器不支持滤镜");return;}i>=3 ? i=0 : i++;oDiv.style.filter='progid:DXImageTransform.Microsoft.BasicImage(rotation='+ (i) +')'; document.getElementById("info").innerHTML= "rotation="+ i + "，旋转"+ (i*90) + "度"}</script></body></html>

二、 CSS3 transform

css3 的transform属性允许我们旋转、缩放和移动元素。可以通过给它传递一个 rotate(度数) 值来旋转一个元素，正值表示顺时针方向旋转，负值表示逆时针方向旋转，旋转的中心点为元素的中心。

浏览器支持：Firefox 4+、Oprea 10+、Safari 3.1+、Chrome 8+、IE 9+

CSS代码：

.rotate{-ms-transform:rotate(90deg); /* IE 9 */-moz-transform:rotate(90deg); /* Firefox */-webkit-transform:rotate(90deg); /* Safari and Chrome */-o-transform:rotate(90deg); /* Opera */}

JS代码：

element.style.webkitTransform="rotate(-90deg)"element.style.MozTransform="rotate(-90deg)"element.style.msTransform="rotate(-90deg)"element.style.OTransform="rotate(-90deg)"element.style.transform="rotate(-90deg)";

css3 tranform rotate 旋转演示：

<!DOCTYPE html><html><head><meta charset="gb2312" /><title>css 3 transform rotate</title><style>a img{ border:none}</style></head><body><div id="rotate" style=" cursor:pointer; position:absolute; left:100px; top:100px"><a href="http://www.amazon.cn/gp/product/B006GYJ5LY/ref=as_li_qf_sp_asin_tl?ie=UTF8&camp=536&creative=3200&creativeASIN=B006GYJ5LY&linkCode=as2&tag=buyed-23"><img src="http://ec4.images-amazon.com/images/I/410Ve1e79CL._SL500_AA300_.jpg" /></a><img src="http://www.assoc-amazon.cn/e/ir?t=buyed-23&l=as2&o=28&a=B006GYJ5LY" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" /></div><script>(function(){var element = document.getElementById("rotate");var r = 0;var i = 1;function rotate(){r += i;if( Math.abs(r) >= 25 ) i*=-1element.style.MozTransform = "rotate(" + r + "deg)";element.style.webkitTransform ="rotate(" + r + "deg)";element.style.msTransform = "rotate(" + r + "deg)";element.style.OTransform = "rotate(" + r + "deg)";element.style.transform = "rotate(" + r + "deg)";}var timer = setInterval(rotate,50);element.onmouseover = function(){clearInterval(timer);timer = null;};element.onmouseout = function(){if(timer)return;timer = setInterval(rotate,30);};}());</script></body></html>

三、 HTML5 canvas rotate

使用canvas 2d绘图上下文对象的context.rotate(angle)方法，通过指定需要旋转的弧度旋转坐标轴来实现图片的旋转，正值表示顺时针方向旋转，负值表示逆时针方向旋转，旋转的中心点时画布的左上角。角度转换弧度的公式为：弧度 = 角度 * Math.PI / 180。

浏览器支持：Chrome 1.0+、Firefox 1.5+、Opera 9.0+、Safari 1.3+ 、IE 9+

JS代码：

context = canvas.getContext("2d")context.rotate(90 * Math.PI / 180);context.drawImage(img, 0, -img.height);

坐标旋转示意图：

HTML5 canvas rotate旋转演示：

<!DOCTYPE html><html><head><meta charset="gb2312" /><title>HTML5 canvas rotate</title></head><body><a href="http://www.amazon.cn/gp/product/B009DFCZAQ/ref=as_li_qf_sp_asin_tl?ie=UTF8&camp=536&creative=3200&creativeASIN=B009DFCZAQ&linkCode=as2&tag=buyed-23">HTML5秘籍/图灵程序设计丛书</a><img src="http://www.assoc-amazon.cn/e/ir?t=buyed-23&l=as2&o=28&a=B009DFCZAQ" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" /><br><script>(function(){var canvas = document.createElement("canvas");canvas.style = "border:1px solid #ccc"var context = canvas.getContext("2d");var img = new Image();if(context == null){return;}img.src="http://img1.douban.com/lpic/s11190661.jpg";img.onload = function(){var length =  Math.sqrt(Math.pow(this.width, 2) + Math.pow(this.height, 2));//计算画布大小，取图形的对角线，否则旋转时可能隐藏掉部分内容canvas.width = length;canvas.height = length;//context.strokeRect(0, 0, length, length);context.translate(canvas.width/2, canvas.height/2);//平移坐标原点到画布中心//context.rotate(30 * Math.PI / 180);context.drawImage(this, (-this.width / 2), ( -this.height / 2 ));timer = setInterval(rotate, 50);}var r = 0;var i = 1; function rotate(){r += i;if( Math.abs(r) >= 25 ) i*=-1;//左右摆动25度context.save();//保存坐标抽状态context.clearRect(-canvas.width/2,  -canvas.height/2, canvas.width, canvas.height);context.rotate(r * Math.PI / 180);context.drawImage(img, (-img.width / 2), ( -img.height / 2 )); //把图片填充到画布中心context.restore() //还原坐标抽状态};//绑定事件canvas.onmouseover = function(){clearInterval(timer);timer = null;};canvas.onclick = function(){location.href= "http://www.amazon.cn/gp/product/B009DFCZAQ/ref=as_li_qf_sp_asin_tl?ie=UTF8&camp=536&creative=3200&creativeASIN=B009DFCZAQ&linkCode=as2&tag=buyed-23";};canvas.onmouseout = function(){if(timer)return;timer = setInterval(rotate,50);};document.body.appendChild(canvas);}());</script></body></html>

0 0