jquery图片放大镜功能的实例代码(2)

?<script type="text/javascript">
/**
@开发：杨永
@功能：实现细节放大，图片对应切换，自由定义css样式实现自由铺满视口等功能
@说明：基于jQ的放大镜插件，可根据需要自由调整布局来适应各种设计效果
*/
(function(){
        function Zoom(object){
                this.zoomArea=$(".zoom",object);//保存促发放大效果的区域
                this.moveArea=$(".move",object);//保存移动区域
                this.zoomDetail=$(".zoomDetail",object);//保存放大镜区域
                this.zoomDetailImg=$("img",this.zoomDetail);//保存放大镜里面的图
                this.zoomAreaWidth=this.zoomArea.width();
                this.moveAreaWidth=this.moveArea.width();
                this.zoomAreaHeight=this.zoomArea.height();
                this.moveAreaHeight=this.moveArea.height();
                this.zoomDetailWidth=this.zoomDetail.width();
                this.zoomDetailHeight=this.zoomDetail.height();
                this.zoomAreaOffset=this.zoomArea.offset();//初始化放大区域在视口中的相对偏移;
                this.XY=null;//初始化鼠标相对于放大区域的偏移偏移值
                this.moveBili=null;//
                var _this_=this;
                this.zoomArea.mousemove(function(e){//当鼠标在放大区域移动的时候执行
                                                 _this_.move(e.pageX,e.pageY);   
                                        }).mouseover(function(){
                                            _this_.moveArea.show();
                                            _this_.zoomDetail.show();
                                            }).mouseout(function(){
                                                _this_.moveArea.hide();
                                                _this_.zoomDetail.hide();                                               
                                                });
                this.calculate();//初始化并计算出需要的比例值
                //以下是小图部分的功能实现
                this.l=0;
                this.scrollObj=$(".slideMain ul",object);//保存ul滚动对象
                this.lis=this.scrollObj.children();//保存小图片列表
                this.btnR=$(".btnR",object);//保存右边按钮
                this.btnL=$(".btnL",object);//保存左边边按钮
                this.lis.click(function(){
                                        _this_.changeImgSrc(this);
                                        });
                if(this.lis.length>6){//判断图片数是否超出显示区域，是的话就注册滚动事件
                    this.s=this.lis.length-6;//获取多余出来的图片数
                    this.scrollObj.width(60*this.lis.length+"px");//当图片数超出默认值时，设置ul的宽度
                    this.btnL.click(function(){_this_.scrollRight();}).mouseover(function(){$(this).addClass("hover")}).mouseout(function(){$(this).removeClass("hover");});
                    this.btnR.click(function(){_this_.scrollLeft();}).mouseover(function(){$(this).addClass("hover")}).mouseout(function(){$(this).removeClass("hover");});;
                }
              };
        Zoom.prototype={
            scrollLeft:function(){
                if(Math.abs(this.l)==this.s){return};
                this.l--;
                this.scrollObj.animate({left:this.l*58+"px"},"fast");   
                },
            scrollRight:function(){
                if(this.l==0){return};
                this.l++;
                this.scrollObj.animate({left:this.l*58+"px"},"fast");
                },
            changeImgSrc:function(o){
                //改变标识样式
                $(o).addClass("selected").siblings().removeClass("selected");
                this.zoomArea.find("img").attr("src",$(o).find("img").attr("medium-img"));
                this.zoomDetailImg.attr("src",$(o).find("img").attr("medium-img"));

                },
            move:function(x,y){//鼠标在放大区域移动的时候执行的函数
                    this.XY=this.mousePosAndSetPos(x,y);//计算出鼠标相对于放大区域的x,y值
                    //设置滑块的位置
                    this.moveArea.css({
                                      left:this.XY.offsetX+"px",
                                      top:this.XY.offsetY+"px"
                                      });
                    //设置大图在细节位置
                    this.zoomDetailImg.css({
                                           marginLeft:-this.XY.offsetX*this.moveBili+"px",
                                           marginTop:-this.XY.offsetY*this.moveBili+"px"
                                           });
                },
            mousePosAndSetPos:function(x,y){//实时计算并设置滑块的位置
                x=x-this.zoomAreaOffset.left-this.moveArea.width()/2;
                y=y-this.zoomAreaOffset.top-this.moveArea.height()/2;
                x=x<0?0:x;
                y=y<0?0:y;
                x=x>(this.zoomAreaWidth-this.moveAreaWidth)?this.zoomAreaWidth-this.moveAreaWidth:x;
                y=y>(this.zoomAreaHeight-this.moveAreaHeight)?this.zoomAreaHeight-this.moveAreaHeight:y;
                return {
                        offsetX:x,
                        offsetY:y
                        };  
                },
            calculate:function(){//计算函数
                    var widthBili,heightBili;
                    //计算移动的滑块与放大镜铺面显示的比例宽高
                    widthBili=(this.zoomAreaWidth*this.zoomDetailWidth)/this.moveAreaWidth;
                    heightBili=(this.zoomAreaHeight*this.zoomDetailHeight)/this.moveAreaHeight;
                    //把比出来的宽高
                    this.zoomDetailImg.css({width:widthBili+"px",height:heightBili+"px"});
                    //返回移动的比例
                    this.moveBili=(widthBili-this.zoomDetailWidth)/(this.zoomAreaWidth-this.moveAreaWidth);
                }
            };
          var zoom=new Zoom($(".ZoomMain").eq(0));    
})();