(function($){var methods={init:function(options){return this.each(function(){var $this=$(this),data=$this.data('eraser');if(!data){var handleImage=function(){var $canvas=$('<canvas/>'),canvas=$canvas.get(0),ctx=canvas.getContext('2d'),devicePixelRatio=window.devicePixelRatio||1,backingStoreRatio=ctx.webkitBackingStorePixelRatio||ctx.mozBackingStorePixelRatio||ctx.msBackingStorePixelRatio||ctx.oBackingStorePixelRatio||ctx.backingStorePixelRatio||1,scaleRatio=devicePixelRatio/backingStoreRatio,realWidth=$this.width(),realHeight=$this.height(),w=realWidth*scaleRatio,h=realHeight*scaleRatio,pos=$this.offset(),width=(options&&options.width)?options.width:w,height=(options&&options.height)?options.height:h,size=((options&&options.size)?options.size:40)*scaleRatio,completeRatio=(options&&options.completeRatio)?options.completeRatio:1,opacity=(options&&options.opacity)?options.opacity:1,completeFunction=(options&&options.completeFunction)?options.completeFunction:null,progressFunction=(options&&options.progressFunction)?options.progressFunction:null,zIndex=$this.css('z-index')=="auto"?1:$this.css('z-index'),parts=[],colParts=Math.floor(w/size),numParts=colParts*Math.floor(h/size),n=numParts,that=$this[0];$this.after($canvas);canvas.id=that.id;canvas.className=that.className;canvas.width=w;canvas.height=h;canvas.style.width=realWidth.toString()+"px";canvas.style.height=realHeight.toString()+"px";ctx.drawImage(that,0,0,width,height);$this.remove();ctx.globalCompositeOperation='destination-out';ctx.strokeStyle='rgba(0, 0, 0,'+opacity+')';ctx.lineWidth=size;ctx.lineCap='round';$canvas.bind('mousedown.eraser',methods.mouseDown);$canvas.bind('touchstart.eraser',methods.touchStart);$canvas.bind('touchmove.eraser',methods.touchMove);$canvas.bind('touchend.eraser',methods.touchEnd);while(n--)parts.push(1);data={posX:pos.left,posY:pos.top,touchDown:false,touchID:-999,touchX:0,touchY:0,ptouchX:0,ptouchY:0,canvas:$canvas,ctx:ctx,w:w,h:h,width:width,height:height,scaleRatio:scaleRatio,source:that,size:size,parts:parts,colParts:colParts,numParts:numParts,ratio:0,complete:false,completeRatio:completeRatio,completeFunction:completeFunction,progressFunction:progressFunction,zIndex:zIndex};$canvas.data('eraser',data);$(window).resize(function(){var pos=$canvas.offset();data.posX=pos.left;data.posY=pos.top})};if(this.complete&&this.naturalWidth>0){handleImage()}else{$this.load(handleImage)}}})},touchStart:function(event){var $this=$(this),data=$this.data('eraser');if(!data.touchDown){var t=event.originalEvent.changedTouches[0],tx=t.pageX-data.posX,ty=t.pageY-data.posY;tx*=data.scaleRatio;ty*=data.scaleRatio;methods.evaluatePoint(data,tx,ty);data.touchDown=true;data.touchID=t.identifier;data.touchX=tx;data.touchY=ty;event.preventDefault()}},touchMove:function(event){var $this=$(this),data=$this.data('eraser');if(data.touchDown){var ta=event.originalEvent.changedTouches,n=ta.length;while(n--){if(ta[n].identifier==data.touchID){var tx=ta[n].pageX-data.posX,ty=ta[n].pageY-data.posY;tx*=data.scaleRatio;ty*=data.scaleRatio;methods.evaluatePoint(data,tx,ty);data.ctx.beginPath();data.ctx.moveTo(data.touchX,data.touchY);data.touchX=tx;data.touchY=ty;data.ctx.lineTo(data.touchX,data.touchY);data.ctx.stroke();$this.css({"z-index":$this.css('z-index')==data.zIndex?parseInt(data.zIndex)+1:data.zIndex});event.preventDefault();break}}}},touchEnd:function(event){var $this=$(this),data=$this.data('eraser');if(data.touchDown){var ta=event.originalEvent.changedTouches,n=ta.length;while(n--){if(ta[n].identifier==data.touchID){data.touchDown=false;event.preventDefault();break}}}},evaluatePoint:function(data,tx,ty){var p=Math.floor(tx/data.size)+Math.floor(ty/data.size)*data.colParts;if(p>=0&&p<data.numParts){data.ratio+=data.parts[p];data.parts[p]=0;if(!data.complete){p=data.ratio/data.numParts;if(p>=data.completeRatio){data.complete=true;if(data.completeFunction!=null)data.completeFunction()}else{if(data.progressFunction!=null)data.progressFunction(p)}}}},mouseDown:function(event){var $this=$(this),data=$this.data('eraser'),tx=event.pageX-data.posX,ty=event.pageY-data.posY;tx*=data.scaleRatio;ty*=data.scaleRatio;methods.evaluatePoint(data,tx,ty);data.touchDown=true;data.touchX=tx;data.touchY=ty;data.ctx.beginPath();data.ctx.moveTo(data.touchX-1,data.touchY);data.ctx.lineTo(data.touchX,data.touchY);data.ctx.stroke();$this.bind('mousemove.eraser',methods.mouseMove);$(document).bind('mouseup.eraser',data,methods.mouseUp);event.preventDefault()},mouseMove:function(event){var $this=$(this),data=$this.data('eraser'),tx=event.pageX-data.posX,ty=event.pageY-data.posY;tx*=data.scaleRatio;ty*=data.scaleRatio;methods.evaluatePoint(data,tx,ty);data.ctx.beginPath();data.ctx.moveTo(data.touchX,data.touchY);data.touchX=tx;data.touchY=ty;data.ctx.lineTo(data.touchX,data.touchY);data.ctx.stroke();$this.css({"z-index":$this.css('z-index')==data.zIndex?parseInt(data.zIndex)+1:data.zIndex});event.preventDefault()},mouseUp:function(event){var data=event.data,$this=data.canvas;data.touchDown=false;$this.unbind('mousemove.eraser');$(document).unbind('mouseup.eraser');event.preventDefault()},clear:function(){var $this=$(this),data=$this.data('eraser');if(data){data.ctx.clearRect(0,0,data.w,data.h);var n=data.numParts;while(n--)data.parts[n]=0;data.ratio=data.numParts;data.complete=true;if(data.completeFunction!=null)data.completeFunction()}},size:function(value){var $this=$(this),data=$this.data('eraser');if(data&&value){data.size=value;data.ctx.lineWidth=value}},reset:function(){var $this=$(this),data=$this.data('eraser');if(data){data.ctx.globalCompositeOperation='source-over';data.ctx.drawImage(data.source,0,0,data.width,data.height);data.ctx.globalCompositeOperation='destination-out';var n=data.numParts;while(n--)data.parts[n]=1;data.ratio=0;data.complete=false;data.touchDown=false}},progress:function(){var $this=$(this),data=$this.data('eraser');if(data){return data.ratio/data.numParts}return 0}};$.fn.eraser=function(method){if(methods[method]){return methods[method].apply(this,Array.prototype.slice.call(arguments,1))}else if(typeof method==='object'||!method){return methods.init.apply(this,arguments)}else{$.error('Method '+method+' does not yet exist on jQuery.eraser')}}})(jQuery);