/*
Easy pie chart is a jquery plugin to display simple animated pie charts for only one value

Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.

Built on top of the jQuery library (http://jquery.com)

@source: http://github.com/rendro/easy-pie-chart/
@autor: Robert Fleischmann
@version: 1.2.3

Inspired by: http://dribbble.com/shots/631074-Simple-Pie-Charts-II?list=popular&offset=210
Thanks to Philip Thrasher for the jquery plugin boilerplate for coffee script
*/
(function($){$.easyPieChart=function(el,options){var addScaleLine,animateLine,drawLine,easeInOutQuad,rAF,renderBackground,renderScale,renderTrack,_this=this;this.el=el;this.$el=$(el);this.$el.data("easyPieChart",this);this.init=function(){var percent,scaleBy;_this.options=$.extend({},$.easyPieChart.defaultOptions,options);percent=parseInt(_this.$el.data('percent'),10);_this.percentage=0;_this.canvas=$("<canvas width='"+_this.options.size+"' height='"+_this.options.size+"'></canvas>").get(0);_this.$el.append(_this.canvas);if(typeof G_vmlCanvasManager!=="undefined"&&G_vmlCanvasManager!==null){G_vmlCanvasManager.initElement(_this.canvas);}_this.ctx=_this.canvas.getContext('2d');if(window.devicePixelRatio>1){scaleBy=window.devicePixelRatio;$(_this.canvas).css({width:_this.options.size,height:_this.options.size});_this.canvas.width*=scaleBy;_this.canvas.height*=scaleBy;_this.ctx.scale(scaleBy,scaleBy);}_this.ctx.translate(_this.options.size/2,_this.options.size/2);_this.ctx.rotate(_this.options.rotate*Math.PI/180);_this.$el.addClass('easyPieChart');_this.$el.css({width:_this.options.size,height:_this.options.size,lineHeight:""+_this.options.size+"px"});_this.update(percent);return _this;};this.update=function(percent){percent=parseFloat(percent)||0;if(_this.options.animate===false){drawLine(percent);}else{animateLine(_this.percentage,percent);}return _this;};renderScale=function(){var i,_i,_results;_this.ctx.fillStyle=_this.options.scaleColor;_this.ctx.lineWidth=1;_results=[];for(i=_i=0;_i<=24;i=++_i){_results.push(addScaleLine(i));}return _results;};addScaleLine=function(i){var offset;offset=i%6===0?0:_this.options.size*0.017;_this.ctx.save();_this.ctx.rotate(i*Math.PI/12);_this.ctx.fillRect(_this.options.size/2-offset,0,-_this.options.size*0.05+offset,1);_this.ctx.restore();};renderTrack=function(){var offset;offset=_this.options.size/2-_this.options.lineWidth/2;if(_this.options.scaleColor!==false){offset-=_this.options.size*0.08;}_this.ctx.beginPath();_this.ctx.arc(0,0,offset,0,Math.PI*2,true);_this.ctx.closePath();_this.ctx.strokeStyle=_this.options.trackColor;_this.ctx.lineWidth=_this.options.lineWidth;_this.ctx.stroke();};renderBackground=function(){if(_this.options.scaleColor!==false){renderScale();}if(_this.options.trackColor!==false){renderTrack();}};drawLine=function(percent){var offset;renderBackground();_this.ctx.strokeStyle=$.isFunction(_this.options.barColor)?_this.options.barColor(percent):_this.options.barColor;_this.ctx.lineCap=_this.options.lineCap;_this.ctx.lineWidth=_this.options.lineWidth;offset=_this.options.size/2-_this.options.lineWidth/2;if(_this.options.scaleColor!==false){offset-=_this.options.size*0.08;}_this.ctx.save();_this.ctx.rotate(-Math.PI/2);_this.ctx.beginPath();_this.ctx.arc(0,0,offset,0,Math.PI*2*percent/100,false);_this.ctx.stroke();_this.ctx.restore();};rAF=(function(){return window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||function(callback){return window.setTimeout(callback,1000/60);};})();animateLine=function(from,to){var anim,startTime;_this.options.onStart.call(_this);_this.percentage=to;Date.now||(Date.now=function(){return+(new Date);});startTime=Date.now();anim=function(){var currentValue,process;process=Date.now()-startTime;if(process<_this.options.animate){rAF(anim);}_this.ctx.clearRect(-_this.options.size/2,-_this.options.size/2,_this.options.size,_this.options.size);renderBackground.call(_this);currentValue=[easeInOutQuad(process,from,to-from,_this.options.animate)];_this.options.onStep.call(_this,currentValue);drawLine.call(_this,currentValue);if(process>=_this.options.animate){return _this.options.onStop.call(_this,currentValue,to);}};rAF(anim);};easeInOutQuad=function(t,b,c,d){var easeIn,easing;easeIn=function(t){return Math.pow(t,2);};easing=function(t){if(t<1){return easeIn(t);}else{return 2-easeIn((t/2)*-2+2);}};t/=d/2;return c/2*easing(t)+b;};return this.init();};$.easyPieChart.defaultOptions={barColor:'#ef1e25',trackColor:'#f2f2f2',scaleColor:'#dfe0e0',lineCap:'round',rotate:0,size:110,lineWidth:3,animate:false,onStart:$.noop,onStop:$.noop,onStep:$.noop};$.fn.easyPieChart=function(options){return $.each(this,function(i,el){var $el,instanceOptions;$el=$(el);if(!$el.data('easyPieChart')){instanceOptions=$.extend({},options,$el.data());return $el.data('easyPieChart',new $.easyPieChart(el,instanceOptions));}});};return void 0;})(jQuery);
