预览图：
说明：
此插件没有做兼容处理，做的过程中只是做思路逻辑分析，至于IE下，没有兼容开发，可在其他标准浏览器下运行，查看源代码
DOM:
<head> <script src="jquery.js"></script> <script src="clip.js"></script> </head>
<body> <div class="clip-wrapper"> <div id="J_ClipPicture" class="clip-box"> <img class="clip-layer-bg" src="3.jpg" height="100%" width="100%"> <img class="clip-layer" src="3.jpg" height="100%" width="100%"> <div class="clip-move"> <span class="left-up"></span> <span class="up"></span> <span class="right-up"></span> <span class="right"></span> <span class="right-down"></span> <span class="down"></span> <span class="left-down"></span> <span class="left"></span> </div> </div> <div class="clip-view"> <img class="clip-layer" src="3.jpg" height="100%" width="100%"> </div> </div> </body>
CSS:
.clip-wrapper{ padding:20px; position:relative;width:600px;height:600px; background-color:#eee;} .clip-box{ position:relative;width:200px;height:300px; text-align:center;background-color:#333;} .clip-box img{ position:absolute;left:0;top:0;} .clip-box img.clip-layer-bg{opacity:0.3;} .clip-box img.clip-layer{ clip:rect(0 100px 150px 0);} .clip-move{ position:absolute;left:0;top:0;width:100px;height:150px;border:1px solid #fff; box-sizing:border-box; cursor:move;} .clip-move span{ position:absolute; display:block;width:8px;height:8px;border-radius:4px;background-color:#fff;} .clip-move .left-up{left:-4px;top:-4px; cursor:nw-resize;} .clip-move .up{left:50%;top:-4px;margin-left:-4px; cursor:n-resize;} .clip-move .right-up{right:-4px;top:-4px;margin-left:-4px; cursor:ne-resize;} .clip-move .right{right:-4px;top:50%;margin-top:-4px; cursor:e-resize;} .clip-move .right-down{right:-4px;bottom:-4px; cursor:se-resize;} .clip-move .down{left:50%;bottom:-4px; margin-left:-4px;cursor:s-resize;} .clip-move .left-down{left:-4px;bottom:-4px;cursor:sw-resize;} .clip-move .left{left:-4px;top:50%; margin-top:-4px;cursor:w-resize;} .clip-view{ position:absolute;left:230px;top:20px;;width:200px;height:300px; overflow:hidden} .clip-view img.clip-layer{ position:absolute; clip:rect(0 100px 150px 0);}
JS:
/** *头像剪裁功能 *此插件没有做兼容处理，做的过程中只是做思路逻辑分析，至于IE下，没有兼容开发，可在其他标准浏览器下运行，查看源代码 *name:杨永 *QQ :377746756 */ ;(function($){ var ClipPicture=function(clipWrap,setting){ var _this_=this; //设置配置参数 this.setting={ clipWidth:50, clipHeight:50 }; //扩展默认参数 $.extend(this.setting,setting); //保存传递进来的剪切区域 this.clipWrap=clipWrap; //保存剪裁区域相对于页面的偏移和剪裁区域的尺寸 this.clipMainOffset=clipWrap.offset(); this.clipScale={clipWrap.width(),height:clipWrap.height()}; //获取预览区域 this.clipScaleView=clipWrap.next(); this.viewImg=this.clipScaleView.find(".clip-layer")[0]; //获取需要操作的DOM this.clipMoveDiv=clipWrap.find(".clip-move"); this.clipImg=clipWrap.find(".clip-layer")[0]; this.resizeClipBtn=this.clipMoveDiv.find("span"); //初始化拖动功能 this.initDrag(); //初始化调整剪裁区域大小功能 this.initClipScale(); }; ClipPicture.prototype={ //初始化调整剪裁区域大小功能 initClipScale:function(){ var self=this, resizeClipBtn=this.resizeClipBtn, doc=$(document), diffOpts=null, curBtn=null;//记录偏移量和宽度 //绑定事件 resizeClipBtn.mousedown(function(evt){ var _this=curBtn=this; //取消事件冒泡 evt.stopPropagation(); evt.preventDefault(); //更具点击的方位设置相对哪个点进行定为 self.setPostion($(this)); //设置偏移量可宽度 diffOpts={ positionLeft:self.clipMoveDiv.position().left, positionTop:self.clipMoveDiv.position().top, offsetLeft:self.clipMoveDiv.offset().left, offsetTop:self.clipMoveDiv.offset().top, self.clipMoveDiv.width(), height:self.clipMoveDiv.height() }; //绑定doc事件 doc.bind("mousemove",mousemoveHandle); doc.bind("mouseup",mouseupHandle); }); var mousemoveHandle=function(evt){ self.scale(evt,$(curBtn),diffOpts); }; var mouseupHandle=function(){ doc.unbind("mousemove",mousemoveHandle); doc.unbind("mouseup",mouseupHandle); }; }, scale:function(evt,curBtn,diffOpts){ var self=this; var clipMoveDiv=this.clipMoveDiv; //根据按钮类型执行函数 if(curBtn.hasClass("right")){ self.scaleXAdd(evt,diffOpts); }; if(curBtn.hasClass("left")){ self.scaleXMin(evt,diffOpts); }; if(curBtn.hasClass("down")){ self.scaleYAdd(evt,diffOpts); }; if(curBtn.hasClass("up")){ self.scaleYMin(evt,diffOpts); }; if(curBtn.hasClass("right-up")){ self.scaleXAdd(evt,diffOpts); self.scaleYMin(evt,diffOpts); }; if(curBtn.hasClass("right-down")){ self.scaleXAdd(evt,diffOpts); self.scaleYAdd(evt,diffOpts); }; if(curBtn.hasClass("left-down")){ self.scaleYAdd(evt,diffOpts); self.scaleXMin(evt,diffOpts); }; if(curBtn.hasClass("left-up")){ self.scaleYMin(evt,diffOpts); self.scaleXMin(evt,diffOpts); }; //调整剪裁区域this.viewImg this.clipImg.style.clip="rect("+clipMoveDiv.position().top+"px "+(clipMoveDiv.position().left+clipMoveDiv.width()+2)+"px "+(clipMoveDiv.position().top+clipMoveDiv.height()+2)+"px "+clipMoveDiv.position().left+"px)"; this.viewImg.style.clip="rect("+clipMoveDiv.position().top+"px "+(clipMoveDiv.position().left+clipMoveDiv.width()+2)+"px "+(clipMoveDiv.position().top+clipMoveDiv.height()+2)+"px "+clipMoveDiv.position().left+"px)"; $(self.viewImg).css({ left:-clipMoveDiv.position().left, top:-clipMoveDiv.position().top }); }, scaleXAdd:function(evt,diffOpts){ var width=evt.pageX-diffOpts.offsetLeft; width=width+diffOpts.positionLeft>this.clipScale.width?this.clipScale.width-diffOpts.positionLeft:width; this.clipMoveDiv.css("width",width); }, scaleXMin:function(evt,diffOpts){ var offsetRight=this.clipScale.width-diffOpts.width-diffOpts.positionLeft; var width=diffOpts.offsetLeft+diffOpts.width-evt.pageX; width=width+offsetRight>this.clipScale.width?this.clipScale.width-offsetRight+2:width; this.clipMoveDiv.css("width",width); }, scaleYAdd:function(evt,diffOpts){ var height=evt.pageY-diffOpts.offsetTop; height=height+diffOpts.positionTop>this.clipScale.height?this.clipScale.height-diffOpts.positionTop:height; this.clipMoveDiv.css("height",height); }, scaleYMin:function(evt,diffOpts){ var offsetTop=this.clipScale.height-diffOpts.height-diffOpts.positionTop; var height=diffOpts.offsetTop+diffOpts.height-evt.pageY; height=height+offsetTop>this.clipScale.height?this.clipScale.height-offsetTop+2:height; this.clipMoveDiv.css("height",height); }, //更具点击的方位设置相对哪个点进行 setPostion:function(curBtn){ var self=this; var clipMoveDiv=this.clipMoveDiv; //获取相对父元素的偏移和自身的宽高 var position=clipMoveDiv.position(), right=self.clipScale.width-(position.left+clipMoveDiv.width())-2, bottom=self.clipScale.height-(position.top+clipMoveDiv.height())-2; //根据class来定位 if(curBtn.hasClass("left-up")){ clipMoveDiv.css({left:"auto",top:"auto",right:right+"px",bottom:bottom}); }; if(curBtn.hasClass("right-up")){ clipMoveDiv.css({left:position.left,top:"auto",right:"auto",bottom:bottom}); }; if(curBtn.hasClass("right-down")){ clipMoveDiv.css({left:position.left,top:position.top,right:"auto",bottom:"auto"}); }; if(curBtn.hasClass("left-down")){ clipMoveDiv.css({left:"auto",top:position.top,right:right,bottom:"auto"}); }; if(curBtn.hasClass("left")||curBtn.hasClass("up")){ clipMoveDiv.css({left:"auto",top:"auto",right:right,bottom:bottom}); }; if(curBtn.hasClass("right")||curBtn.hasClass("down")){ clipMoveDiv.css({left:position.left,top:position.top,right:"auto",bottom:"auto"}); }; }, //拖动功能 initDrag:function(){ var self=this clipMoveDiv=self.clipMoveDiv, doc=$(document), layerOffset=null; clipMoveDiv.mousedown(function(evt){ evt.preventDefault(); //获取鼠标layerX,layerY layerOffset=self.getLayerOffset(evt); //在document上绑定mousemove,mouseup doc.bind("mousemove",mousemoveHandle); doc.bind("mouseup",mouseupHandle); }); //移动操作函数 var mousemoveHandle=function(evt){ self.move(evt,layerOffset); }; var mouseupHandle=function(){ doc.unbind("mousemove",mousemoveHandle); doc.unbind("mouseup",mouseupHandle); }; }, //move move:function(evt,layerOffset){ var self=this; var moveDiv=this.clipMoveDiv; var left=this.getMoveOffset(evt,layerOffset).left, top=this.getMoveOffset(evt,layerOffset).top; var maxW=this.clipScale.width-moveDiv.width()-2, maxH=this.clipScale.height-moveDiv.height()-2; //通过指定区域去限制拖动的范围 left=left<0?0:left>maxW?maxW:left; top=top<0?0:top>maxH?maxH:top; moveDiv.css({ left:left, top:top }); $(self.viewImg).css({ left:-left, top:-top }); self.moveClipRect(left,top); }, //驱动剪裁区域 moveClipRect:function(left,top){ //clip:rect(0 100px 100px 0); this.clipImg.style.clip="rect("+top+"px "+(left+this.clipMoveDiv.width()+2)+"px "+(top+this.clipMoveDiv.height()+2)+"px "+left+"px)"; this.viewImg.style.clip="rect("+top+"px "+(left+this.clipMoveDiv.width()+2)+"px "+(top+this.clipMoveDiv.height()+2)+"px "+left+"px)"; }, //获取移动的left，top getMoveOffset:function(evt,layerOffset){ return { left:evt.pageX-this.clipMainOffset.left-layerOffset.layerX, top:evt.pageY-this.clipMainOffset.top-layerOffset.layerY }; }, //获取鼠标layerX,layerY getLayerOffset:function(evt){ //就是鼠标的相对页面的偏移减去当前层相对于页面的偏移 return { layerX:evt.pageX-this.clipMoveDiv.offset().left, layerY:evt.pageY-this.clipMoveDiv.offset().top }; } }; //注册到全局 window.ClipPicture=ClipPicture; })(jQuery);
创建方式:
<script> $(function(){ new ClipPicture($("#J_ClipPicture"),{clipWidth:50,clipHeight:500}); }); </script>