JavaScript 图片切割效果(带拖放、缩放效果)[转/改]

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原文来自:http://www.cnblogs.com/cloudgamer/archive/2008/07/21/1247267.html
作者:cloudgamer
自己的网站需要这个功能,看到了cloudgamer的程序,非常值得收藏和使用,所以自己请教了cloudgamer,并进行了小小的修改,感谢cloudgamer的支持,本程序可以获取到选取框的尺寸!
<!DOCTYPEhtmlPUBLIC"-//W3C//DTDXHTML1.0Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<htmlxmlns="http://www.w3.org/1999/xhtml">
<head>

<metahttp-equiv="Content-Type"content="text/html;charset=gb2312"/>
<title>JavaScript图片切割效果（带拖放、缩放效果）</title>
</head>

<styletype="text/css"> 

#rRightDown,#rLeftDown,#rLeftUp,#rRightUp,#rRight,#rLeft,#rUp,#rDown{position:absolute;background:#F00;width:5px;height:5px;z-index:500;font-size:0;} 

#dragDiv{border:1pxsolid#000000;} 
</style>

<tablewidth="100%"border="0"cellspacing="0"cellpadding="0">
<tr>

<tdwidth="50%"><divid="bgDiv"style="width:240px;height:320px;">

<divid="dragDiv">

<divid="rRightDown"style="right:0;bottom:0;"></div>

<divid="rLeftDown"style="left:0;bottom:0;"></div>

<divid="rRightUp"style="right:0;top:0;"></div>

<divid="rLeftUp"style="left:0;top:0;"></div>

<divid="rRight"style="right:0;top:50%;"></div>

<divid="rLeft"style="left:0;top:50%;"></div>

<divid="rUp"style="top:0;left:50%;"></div>

<divid="rDown"style="bottom:0;left:50%;"></div>
</div>
</div></td>

<td><divid="viewDiv"style="width:200px;height:200px;"></div></td>
</tr>
</table>
<script>

var$=function(id){

return"string"==typeofid?document.getElementById(id):id;
};

varisIE=(document.all)?true:false;

functionaddEventHandler(oTarget,sEventType,fnHandler){

if(oTarget.addEventListener){

oTarget.addEventListener(sEventType,fnHandler,false);

}elseif(oTarget.attachEvent){

oTarget.attachEvent("on"+sEventType,fnHandler);

}else{

oTarget["on"+sEventType]=fnHandler;
}
};

functionremoveEventHandler(oTarget,sEventType,fnHandler){

if(oTarget.removeEventListener){

oTarget.removeEventListener(sEventType,fnHandler,false);

}elseif(oTarget.detachEvent){

oTarget.detachEvent("on"+sEventType,fnHandler);

}else{

oTarget["on"+sEventType]=null;
}
};

varClass={

create:function(){

returnfunction(){

this.initialize.apply(this,arguments);
}
}
}

Object.extend=function(destination,source){

for(varpropertyinsource){
destination[property]=source[property];
}

returndestination;
}

//拖放程序 

varDrag=Class.create();
Drag.prototype={

//拖放对象,触发对象 

initialize:function(obj,drag,options){

varoThis=this;

this._obj=$(obj);//拖放对象 

this.Drag=$(drag);//触发对象 

this._x=this._y=0;//记录鼠标相对拖放对象的位置 

//事件对象(用于移除事件) 

this._fM=function(e){oThis.Move(window.event||e);}

this._fS=function(){oThis.Stop();}

this.SetOptions(options);

this.Limit=!!this.options.Limit;

this.mxLeft=parseInt(this.options.mxLeft);

this.mxRight=parseInt(this.options.mxRight);

this.mxTop=parseInt(this.options.mxTop);

this.mxBottom=parseInt(this.options.mxBottom);

this.onMove=this.options.onMove;

this._obj.style.position="absolute";

addEventHandler(this.Drag,"mousedown",function(e){oThis.Start(window.event||e);});
},

//设置默认属性 

SetOptions:function(options){

this.options={//默认值 

Limit:false,//是否设置限制(为true时下面参数有用,可以是负数) 

mxLeft:0,//左边限制 

mxRight:0,//右边限制 

mxTop:0,//上边限制 

mxBottom:0,//下边限制 

onMove:function(){}//移动时执行 
};

Object.extend(this.options,options||{});
},

//准备拖动 

Start:function(oEvent){

//记录鼠标相对拖放对象的位置 

this._x=oEvent.clientX-this._obj.offsetLeft;

this._y=oEvent.clientY-this._obj.offsetTop;

//mousemove时移动mouseup时停止 

addEventHandler(document,"mousemove",this._fM);

addEventHandler(document,"mouseup",this._fS);

//使鼠标移到窗口外也能释放 

if(isIE){

addEventHandler(this.Drag,"losecapture",this._fS);

this.Drag.setCapture();

}else{

addEventHandler(window,"blur",this._fS);
}
},

//拖动 

Move:function(oEvent){

//清除选择(ie设置捕获后默认带这个) 
window.getSelection&&window.getSelection().removeAllRanges();

//当前鼠标位置减去相对拖放对象的位置得到offset位置 

variLeft=oEvent.clientX-this._x,iTop=oEvent.clientY-this._y;

//设置范围限制 

if(this.Limit){

//获取超出长度 

variRight=iLeft+this._obj.offsetWidth-this.mxRight,iBottom=iTop+this._obj.offsetHeight-this.mxBottom;

//这里是先设置右边下边再设置左边上边,可能会不准确 

if(iRight>0)iLeft-=iRight;

if(iBottom>0)iTop-=iBottom;

if(this.mxLeft>iLeft)iLeft=this.mxLeft;

if(this.mxTop>iTop)iTop=this.mxTop;
}

//设置位置 

this._obj.style.left=iLeft+"px";

this._obj.style.top=iTop+"px";

//附加程序 

this.onMove();
},

//停止拖动 

Stop:function(){

//移除事件 

removeEventHandler(document,"mousemove",this._fM);

removeEventHandler(document,"mouseup",this._fS);

if(isIE){

removeEventHandler(this.Drag,"losecapture",this._fS);

this.Drag.releaseCapture();

}else{

removeEventHandler(window,"blur",this._fS);
}
}
};

//缩放程序 

varResize=Class.create();
Resize.prototype={

//缩放对象 

initialize:function(obj,options){

varoThis=this;

this._obj=$(obj);//缩放对象 

this._right=this._down=this._left=this._up=0;//坐标参数 

this._scale=1;//比例参数 

this._touch=null;//当前触发对象 

//用currentStyle（ff用getComputedStyle）取得最终样式 

var_style=this._obj.currentStyle||document.defaultView.getComputedStyle(this._obj,null);

this._xBorder=parseInt(_style.borderLeftWidth)+parseInt(_style.borderRightWidth);

this._yBorder=parseInt(_style.borderTopWidth)+parseInt(_style.borderBottomWidth);

//事件对象(用于移除事件) 

this._fR=function(e){oThis.Resize(e);}

this._fS=function(){oThis.Stop();}

this.SetOptions(options);

this.Limit=!!this.options.Limit;

this.mxLeft=parseInt(this.options.mxLeft);

this.mxRight=parseInt(this.options.mxRight);

this.mxTop=parseInt(this.options.mxTop);

this.mxBottom=parseInt(this.options.mxBottom);

this.MinWidth=parseInt(this.options.MinWidth);

this.MinHeight=parseInt(this.options.MinHeight);

this.Scale=!!this.options.Scale;

this.onResize=this.options.onResize;

this._obj.style.position="absolute";
},

//设置默认属性 

SetOptions:function(options){

this.options={//默认值 

Limit:false,//是否设置限制(为true时下面mx参数有用) 

mxLeft:0,//左边限制 

mxRight:0,//右边限制 

mxTop:0,//上边限制 

mxBottom:0,//下边限制 

MinWidth:50,//最小宽度 

MinHeight:50,//最小高度 

Scale:false,//是否按比例缩放 

onResize:function(){}//缩放时执行 
};

Object.extend(this.options,options||{});
},

//设置触发对象 

Set:function(resize,side){

varoThis=this,resize=$(resize),_fun,_cursor;

if(!resize)return;

//根据方向设置_fun是缩放时执行的程序_cursor是鼠标样式 

switch(side.toLowerCase()){

case"up":

_fun=function(e){if(oThis.Scale){oThis.scaleUpRight(e);}else{oThis.SetUp(e);}};

_cursor="n-resize";

break;

case"down":

_fun=function(e){if(oThis.Scale){oThis.scaleDownRight(e);}else{oThis.SetDown(e);}};

_cursor="n-resize";

break;

case"left":

_fun=function(e){if(oThis.Scale){oThis.scaleLeftUp(e);}else{oThis.SetLeft(e);}};

_cursor="e-resize";

break;

case"right":

_fun=function(e){if(oThis.Scale){oThis.scaleRightDown(e);}else{oThis.SetRight(e);}};

_cursor="e-resize";

break;

case"left-up":

_fun=function(e){if(oThis.Scale){oThis.scaleLeftUp(e);}else{oThis.SetLeft(e);oThis.SetUp(e);}};

_cursor="nw-resize";

break;

case"right-up":

_fun=function(e){if(oThis.Scale){oThis.scaleRightUp(e);}else{oThis.SetRight(e);oThis.SetUp(e);}};

_cursor="ne-resize";

break;

case"left-down":

_fun=function(e){if(oThis.Scale){oThis.scaleLeftDown(e);}else{oThis.SetLeft(e);oThis.SetDown(e);}};

_cursor="ne-resize";

break;

case"right-down":

default:

_fun=function(e){if(oThis.Scale){oThis.scaleRightDown(e);}else{oThis.SetRight(e);oThis.SetDown(e);}};

_cursor="nw-resize";
}

//设置触发对象 
resize.style.cursor=_cursor;

addEventHandler(resize,"mousedown",function(e){oThis._fun=_fun;oThis._touch=resize;oThis.Start(window.event||e);});
},

//准备缩放 

Start:function(oEvent,o){

//防止冒泡 

if(isIE){oEvent.cancelBubble=true;}else{oEvent.stopPropagation();}

//计算样式初始值 

this.style_width=this._obj.offsetWidth;

this.style_height=this._obj.offsetHeight;

this.style_left=this._obj.offsetLeft;

this.style_top=this._obj.offsetTop;

//设置缩放比例 

if(this.Scale){this._scale=this.style_width/this.style_height;}

//计算当前边的对应另一条边的坐标例如右边缩放时需要左边界坐标 

this._left=oEvent.clientX-this.style_width;

this._right=oEvent.clientX+this.style_width;

this._up=oEvent.clientY-this.style_height;

this._down=oEvent.clientY+this.style_height;

//如果有范围先计算好范围内最大宽度和高度 

if(this.Limit){

this._mxRight=this.mxRight-this._obj.offsetLeft;

this._mxDown=this.mxBottom-this._obj.offsetTop;

this._mxLeft=this.mxLeft+this.style_width+this._obj.offsetLeft;

this._mxUp=this.mxTop+this.style_height+this._obj.offsetTop;
}

//mousemove时缩放mouseup时停止 

addEventHandler(document,"mousemove",this._fR);

addEventHandler(document,"mouseup",this._fS);

//使鼠标移到窗口外也能释放 

if(isIE){

addEventHandler(this._touch,"losecapture",this._fS);

this._touch.setCapture();

}else{

addEventHandler(window,"blur",this._fS);
}
},

//缩放 

Resize:function(e){

//没有触发对象的话返回 

if(!this._touch)return;

//清除选择(ie设置捕获后默认带这个) 
window.getSelection&&window.getSelection().removeAllRanges();

//执行缩放程序 

this._fun(window.event||e);

//设置样式 

//因为计算用的offset是把边框算进去的所以要减去 

this._obj.style.width=this.style_width-this._xBorder+"px";

this._obj.style.height=this.style_height-this._yBorder+"px";

this._obj.style.top=this.style_top+"px";

this._obj.style.left=this.style_left+"px";

//附加程序 

this.onResize();
},

//普通缩放 

//右边 

SetRight:function(oEvent){

//当前坐标位置减去左边的坐标等于当前宽度 

this.repairRight(oEvent.clientX-this._left);
},

//下边 

SetDown:function(oEvent){

this.repairDown(oEvent.clientY-this._up);
},

//左边 

SetLeft:function(oEvent){

//右边的坐标减去当前坐标位置等于当前宽度 

this.repairLeft(this._right-oEvent.clientX);
},

//上边 

SetUp:function(oEvent){

this.repairUp(this._down-oEvent.clientY);
},

//比例缩放 

//比例缩放右下 

scaleRightDown:function(oEvent){

//先计算宽度然后按比例计算高度最后根据确定的高度计算宽度（宽度优先） 

this.SetRight(oEvent);

this.repairDown(parseInt(this.style_width/this._scale));

this.repairRight(parseInt(this.style_height*this._scale));
},

//比例缩放左下 

scaleLeftDown:function(oEvent){

this.SetLeft(oEvent);

this.repairDown(parseInt(this.style_width/this._scale));

this.repairLeft(parseInt(this.style_height*this._scale));
},

//比例缩放右上 

scaleRightUp:function(oEvent){

this.SetRight(oEvent);

this.repairUp(parseInt(this.style_width/this._scale));

this.repairRight(parseInt(this.style_height*this._scale));
},

//比例缩放左上 

scaleLeftUp:function(oEvent){

this.SetLeft(oEvent);

this.repairUp(parseInt(this.style_width/this._scale));

this.repairLeft(parseInt(this.style_height*this._scale));
},

//这里是高度优先用于上下两边(体验更好) 

//比例缩放下右 

scaleDownRight:function(oEvent){

this.SetDown(oEvent);

this.repairRight(parseInt(this.style_height*this._scale));

this.repairDown(parseInt(this.style_width/this._scale));
},

//比例缩放上右 

scaleUpRight:function(oEvent){

this.SetUp(oEvent);

this.repairRight(parseInt(this.style_height*this._scale));

this.repairUp(parseInt(this.style_width/this._scale));
},

//修正程序 

//修正右边 

repairRight:function(iWidth){

//右边和下边只要设置宽度和高度就行 

//当少于最少宽度 

if(iWidth<this.MinWidth){iWidth=this.MinWidth;}

//当超过当前设定的最大宽度 

if(this.Limit&&iWidth>this._mxRight){iWidth=this._mxRight;}

//修改样式 

this.style_width=iWidth;
},

//修正下边 

repairDown:function(iHeight){

if(iHeight<this.MinHeight){iHeight=this.MinHeight;}

if(this.Limit&&iHeight>this._mxDown){iHeight=this._mxDown;}

this.style_height=iHeight;
},

//修正左边 

repairLeft:function(iWidth){

//左边和上边比较麻烦因为还要计算left和top 

//当少于最少宽度 

if(iWidth<this.MinWidth){iWidth=this.MinWidth;}

//当超过当前设定的最大宽度 

elseif(this.Limit&&iWidth>this._mxLeft){iWidth=this._mxLeft;}

//修改样式 

this.style_width=iWidth;

this.style_left=this._obj.offsetLeft+this._obj.offsetWidth-iWidth;
},

//修正上边 

repairUp:function(iHeight){

if(iHeight<this.MinHeight){iHeight=this.MinHeight;}

elseif(this.Limit&&iHeight>this._mxUp){iHeight=this._mxUp;}

this.style_height=iHeight;

this.style_top=this._obj.offsetTop+this._obj.offsetHeight-iHeight;
},

//停止缩放 

Stop:function(){

//移除事件 

removeEventHandler(document,"mousemove",this._fR);

removeEventHandler(document,"mouseup",this._fS);

if(isIE){

removeEventHandler(this._touch,"losecapture",this._fS);

this._touch.releaseCapture();

}else{

removeEventHandler(window,"blur",this._fS);
}

this._touch=null;
}
};

//图片切割 

varImgCropper=Class.create();
ImgCropper.prototype={

//容器对象,拖放缩放对象,图片地址,宽度,高度 

initialize:function(container,drag,url,width,height,options){

varoThis=this;

//容器对象 

this.Container=$(container);

this.Container.style.position="relative";

this.Container.style.overflow="hidden";

//拖放对象 

this.Drag=$(drag);

this.Drag.style.cursor="move";

this.Drag.style.zIndex=200;

if(isIE){

//设置overflow解决ie6的渲染问题(缩放时填充对象高度的问题) 

this.Drag.style.overflow="hidden";

//ie下用一个透明的层填充拖放对象不填充的话onmousedown会失效(未知原因) 

(function(style){

style.width=style.height="100%";style.backgroundColor="#fff";style.filter="alpha(opacity:0)";

})(this.Drag.appendChild(document.createElement("div")).style)
}

this._pic=this.Container.appendChild(document.createElement("img"));//图片对象 

this._cropper=this.Container.appendChild(document.createElement("img"));//切割对象 

this._pic.style.position=this._cropper.style.position="absolute";

this._pic.style.top=this._pic.style.left=this._cropper.style.top=this._cropper.style.left="0";//对齐 

this._cropper.style.zIndex=100;

this._cropper.onload=function(){oThis.SetPos();}

this.Url="img/1.jpg";//图片地址 

this.Width=parseInt(width);//宽度 

this.Height=parseInt(height);//高度 

this.SetOptions(options);

this.Opacity=parseInt(this.options.Opacity);

this.dragTop=parseInt(this.options.dragTop);

this.dragLeft=parseInt(this.options.dragLeft);

this.dragWidth=parseInt(this.options.dragWidth);

this.dragHeight=parseInt(this.options.dragHeight);

//设置预览对象 

this.View=$(this.options.View)||null;//预览对象 

this.viewWidth=parseInt(this.options.viewWidth);

this.viewHeight=parseInt(this.options.viewHeight);

this._view=null;//预览图片对象 

if(this.View){

this.View.style.position="relative";

this.View.style.overflow="hidden";

this._view=this.View.appendChild(document.createElement("img"));

this._view.style.position="absolute";
}

this.Scale=parseInt(this.options.Scale);

//设置拖放 

this._drag=newDrag(this.Drag,this.Drag,{Limit:true,onMove:function(){oThis.SetPos();text();}});

//设置缩放 

this._resize=this.GetResize();

this.Init();
},

//设置默认属性 

SetOptions:function(options){

this.options={//默认值 

Opacity:50,//透明度(0到100) 

//拖放位置和宽高 
dragTop:0,
dragLeft:0,
dragWidth:100,
dragHeight:100,

//缩放触发对象 

Right:"",

Left:"",

Up:"",

Down:"",

RightDown:"",

LeftDown:"",

RightUp:"",

LeftUp:"",

Scale:false,//是否按比例缩放 

//预览对象设置 

View:"",//预览对象 

viewWidth:100,//预览宽度 

viewHeight:100//预览高度 
};

Object.extend(this.options,options||{});
},

//初始化对象 

Init:function(){

varoThis=this;

//设置容器 

this.Container.style.width=this.Width+"px";

this.Container.style.height=this.Height+"px";

//设置拖放对象 

this.Drag.style.top=this.dragTop+"px";

this.Drag.style.left=this.dragLeft+"px";

this.Drag.style.width=this.dragWidth+"px";

this.Drag.style.height=this.dragHeight+"px";

//设置切割对象 

this._pic.src=this._cropper.src=this.Url;

this._pic.style.width=this._cropper.style.width=this.Width+"px";

this._pic.style.height=this._cropper.style.height=this.Height+"px";

if(isIE){

this._pic.style.filter="alpha(opacity:"+this.Opacity+")";

}else{

this._pic.style.opacity=this.Opacity/100;
}

//设置预览对象 

if(this.View){this._view.src=this.Url;}

//设置拖放 

this._drag.mxRight=this.Width;this._drag.mxBottom=this.Height;

//设置缩放 

if(this._resize){this._resize.mxRight=this.Width;this._resize.mxBottom=this.Height;this._resize.Scale=this.Scale;}
},

//设置获取缩放对象 

GetResize:function(){

varop=this.options;

//有触发对象时才设置 

if(op.RightDown||op.LeftDown||op.RightUp||op.LeftUp||op.Right||op.Left||op.Up||op.Down){

varoThis=this,_resize=newResize(this.Drag,{Limit:true,onResize:function(){oThis.SetPos();text();}});

//设置缩放触发对象 

if(op.RightDown){_resize.Set(op.RightDown,"right-down");}

if(op.LeftDown){_resize.Set(op.LeftDown,"left-down");}

if(op.RightUp){_resize.Set(op.RightUp,"right-up");}

if(op.LeftUp){_resize.Set(op.LeftUp,"left-up");}

if(op.Right){_resize.Set(op.Right,"right");}

if(op.Left){_resize.Set(op.Left,"left");}

if(op.Up){_resize.Set(op.Up,"up");}

if(op.Down){_resize.Set(op.Down,"down");}

return_resize;

}else{returnnull;}
},

//设置切割 

SetPos:function(){

varo=this.Drag;

//按拖放对象的参数进行切割 

this._cropper.style.clip="rect("+o.offsetTop+"px"+(o.offsetLeft+o.offsetWidth)+"px"+(o.offsetTop+o.offsetHeight)+"px"+o.offsetLeft+"px)";

//切割预览 

if(this.View)this.PreView();
},

//切割预览 

PreView:function(){

//按比例设置宽度和高度 

varo=this.Drag,h=this.viewWidth,w=h*o.offsetWidth/o.offsetHeight;

if(w>this.viewHeight){w=this.viewHeight;h=w*o.offsetHeight/o.offsetWidth;}

//获取对应比例尺寸 

varscale=h/o.offsetHeight,ph=this.Height*scale,pw=this.Width*scale,pt=o.offsetTop*scale,pl=o.offsetLeft*scale,styleView=this._view.style;

//设置样式 

styleView.width=pw+"px";styleView.height=ph+"px";

styleView.top=-pt+"px";styleView.left=-pl+"px";

//切割预览图 

styleView.clip="rect("+pt+"px"+(pl+w)+"px"+(pt+h)+"px"+pl+"px)";
}
}

varic=newImgCropper("bgDiv","dragDiv","1.jpg",240,320,{
dragTop:50,dragLeft:50,

Right:"rRight",Left:"rLeft",Up:"rUp",Down:"rDown",

RightDown:"rRightDown",LeftDown:"rLeftDown",RightUp:"rRightUp",LeftUp:"rLeftUp",

View:"viewDiv",viewWidth:200,viewHeight:200

})
</script>
<script>

//设置图片大小 

functionSize(w,h){
ic.Width=w;
ic.Height=h;
ic.Init();
}

//换图片 

functionPic(url){
ic.Url=url;
ic.Init();
}

//设置透明度 

functionOpacity(i){
ic.Opacity=i;
ic.Init();
}

//是否使用比例 

functionScale(b){
ic.Scale=b;
ic.Init();
}

functiontext(){

varw=ic.Drag.offsetWidth;
h=ic.Drag.offsetHeight;
document.all.text1.value=w;
document.all.text2.value=h;
}
</script>
<br/>
<br/>
<div>

<inputname="text1"type="text"value=""size="3"/>

<inputtype="text"name="text2"value=""size="3"/>

<inputtype="submit"name="button"id="button"onclick="text()"value="选取框W/H"/>

<inputname=""type="button"value="增肥"onclick="Size(500,400)"/>

<inputname=""type="button"value="还原"onclick="Size(300,400)"/>
</div>

<br/>
<div>

<inputname=""type="button"value="换图"onclick="Pic('img/2.jpg')"/>

<inputname=""type="button"value="还原"onclick="Pic('img/1.jpg')"/>
</div>

<br/>
<div>

<inputname=""type="button"value="透明"onclick="Opacity(0)"/>

<inputname=""type="button"value="还原"onclick="Opacity(50)"/>
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<br/>
<div>

<inputname=""type="button"value="使用比例"onclick="Scale(true)"/>

<inputname=""type="button"value="取消比例"onclick="Scale(false)"/>
</div>
<br/>

</body>
</html>