一个基于jQuery的图片翻转效果

据说,这是一个最近很流行的效果,新浪微博,腾讯微博,都用到了这种效果,本博开博时也追随潮流用上了这种效果,今天又在经典论坛中看到了这个效果.
使用方法:
在你的大图链接中加入class=”miniImg artZoom”例:

<a class="miniImg artZoom" href="http://www.amostoys.com/images/460/graphics/hey.jpg"><img title="Mr.Think" src="http://www.amostoys.com/images/460/graphics/hey.jpg" alt="Zoom" /></a>

核心jQuery代码: 点此查看DEMO

//原作者:唐斌www.planeart.cn/,由Mr.Think整理分享.感谢唐斌同学:)

$(function(){

var imgID = 0;

$('a.artZoom').click(function(){

var id = $(this).attr('rel');

if(id == ''){

id = imgID += 1;

$(this).attr('id','artZoomLink-' +id);

$(this).attr('rel',id)

};

var url = $(this).attr('href');

$(this).append('<div class="loading" title="loading.."></div>');//loading

function getImageSize(url,fn){

var img = new Image();

img.src = url;

if (img.complete){

fn.call(img);

}else{

img.onload = function(){

fn.call(img);

};

};

};

getImageSize(url,function(){

$('#artZoomLink-' +id+ ' .loading').remove();

$('#artZoomLink-' +id).hide();

if (id != '' && $('#artZoomBox-' +id).length == 0){

var html = '';

html += '<div class="artZoomBox" id="artZoomBox-' +id+ '" style="display:none">';

html += ' <div class="tool"><a class="hideImg" href="#" rel="' +id+ '">收起</a><a class="imgLeft" href="#" rel="' +id+ '">向左转</a><a class="imgRight" href="#" rel="' +id+ '">向右转</a><a class="viewImg" href="#" rel="' +id+ '">新窗口打开</a></div>';

html += ' <a href="' +url+ '" class="maxImgLink" id="maxImgLink-' +id+ '" rel="' +id+ '"> <img class="maxImg" width="' +this.width+ '" height="' +this.height+ '" id="maxImg-' +id+ '" src="' +url+ '" /> </a>';

html += '</div>';

$('#artZoomLink-' +id).after(html);

};

$('#artZoomBox-' +id).show('fast');

});

return false;

});

//让IE8在图片旋转后高度能被包含

function IE8height(id){

var w = $('#maxImg-' +id).outerWidth();

var h = $('#maxImg-' +id).outerHeight();

$('#artZoomBox-' +id+ ' a.maxImgLink').css('height','');

if ($.browser.version == '8.0' && w > h) {

var maxHeight = Math.max(w, h);

$('#artZoomBox-' +id+ ' a.maxImgLink').css('height',maxHeight+ 'px');

};

};

$('.artZoomBox a').live('click', function(){

var id = $(this).attr('rel');

//收起

if($(this).attr('class') == 'hideImg' || $(this).attr('class') == 'maxImgLink') {

$('#artZoomBox-' +id).hide('fast',function(){

$('#artZoomLink-' +id).show();

});

};

//左旋转

if($(this).attr('class') == 'imgLeft') {

IE8height(id);

$('#maxImg-' +id).rotateLeft(90);

};

//右旋转

if($(this).attr('class') == 'imgRight') {

IE8height(id);

$('#maxImg-' +id).rotateRight(90);

};

//新窗口打开

if($(this).attr('class') == 'viewImg') window.open($('#maxImgLink-' +id).attr('href'));

return false;

});

});

jQuery.fn.rotate = function(angle,whence) {

var p = this.get(0);

// we store the angle inside the image tag for persistence

if (!whence) {

p.angle = ((p.angle==undefined?0:p.angle) + angle) % 360;

} else {

p.angle = angle;

}

if (p.angle >= 0) {

var rotation = Math.PI * p.angle / 180;

} else {

var rotation = Math.PI * (360+p.angle) / 180;

}

var costheta = Math.cos(rotation);

var sintheta = Math.sin(rotation);

if (document.all && !window.opera) {

var canvas = document.createElement('img');

canvas.src = p.src;

canvas.height = p.height;

canvas.width = p.width;

canvas.style.filter = "progid:DXImageTransform.Microsoft.Matrix(M11="+costheta+",M12="+(-sintheta)+",M21="+sintheta+",M22="+costheta+",SizingMethod='auto expand')";

} else {

var canvas = document.createElement('canvas');

if (!p.oImage) {

canvas.oImage = new Image();

canvas.oImage.src = p.src;

} else {

canvas.oImage = p.oImage;

}

canvas.style.width = canvas.width = Math.abs(costheta*canvas.oImage.width) + Math.abs(sintheta*canvas.oImage.height);

canvas.style.height = canvas.height = Math.abs(costheta*canvas.oImage.height) + Math.abs(sintheta*canvas.oImage.width);

var context = canvas.getContext('2d');

context.save();

if (rotation <= Math.PI/2) {

context.translate(sintheta*canvas.oImage.height,0);

} else if (rotation <= Math.PI) {

context.translate(canvas.width,-costheta*canvas.oImage.height);

} else if (rotation <= 1.5*Math.PI) {

context.translate(-costheta*canvas.oImage.width,canvas.height);

} else {

context.translate(0,-sintheta*canvas.oImage.width);

}

context.rotate(rotation);

context.drawImage(canvas.oImage, 0, 0, canvas.oImage.width, canvas.oImage.height);

context.restore();

}

canvas.id = p.id;

canvas.className = 'maxImg';//定义图片旋转后的className

canvas.angle = p.angle;

p.parentNode.replaceChild(canvas, p);

}

jQuery.fn.rotateRight = function(angle) {

this.rotate(angle==undefined?90:angle);

}

jQuery.fn.rotateLeft = function(angle) {

this.rotate(angle==undefined?-90:-angle);

}

声明一下,本文实例及代码原作者为唐斌同学(他的博客很棒哦~),原文地址:http://www.planeart.cn/?p=696,感谢唐斌同学:).

原文发布于Mr.Think的个人博客: http://mrthink.net/javascript-jquery-zoom-turnimg/ 转载请注明