/**
 * [Chart.PieceLabel.js]{@link https://github.com/emn178/Chart.PieceLabel.js}
 *
 * @version 0.9.0
 * @author Chen, Yi-Cyuan [emn178@gmail.com]
 * @copyright Chen, Yi-Cyuan 2017
 * @license MIT
 */
(function(){function c(){this.drawDataset=this.drawDataset.bind(this)}"undefined"===typeof Chart?console.warn("Can not find Chart object."):(c.prototype.beforeDatasetsUpdate=function(a){if(this.parseOptions(a)&&"outside"===this.position){var b=1.5*this.fontSize+2;a.chartArea.top+=b;a.chartArea.bottom-=b}},c.prototype.afterDatasetsDraw=function(a){this.parseOptions(a)&&(this.labelBounds=[],a.config.data.datasets.forEach(this.drawDataset))},c.prototype.drawDataset=function(a){for(var b=this.ctx,p=this.chartInstance,
l=a._meta[Object.keys(a._meta)[0]],h=0,f=0;f<l.data.length;f++){var g=l.data[f],d=g._view;if(0!==d.circumference||this.showZero){switch(this.render){case "value":var e=a.data[f];this.format&&(e=this.format(e));e=e.toString();break;case "label":e=p.config.data.labels[f];break;case "image":e=this.images[f]?this.loadImage(this.images[f]):"";break;default:var q=d.circumference/this.options.circumference*100;q=parseFloat(q.toFixed(this.precision));this.showActualPercentages||(h+=q,100<h&&(q-=h-100,q=parseFloat(q.toFixed(this.precision))));
e=q+"%"}"function"===typeof this.render&&(e=this.render({label:p.config.data.labels[f],value:a.data[f],percentage:q,dataset:a,index:f}),"object"===typeof e&&(e=this.loadImage(e)));if(!e)break;b.save();b.beginPath();b.font=Chart.helpers.fontString(this.fontSize,this.fontStyle,this.fontFamily);if("outside"===this.position||"border"===this.position&&"pie"===p.config.type){var k=d.outerRadius/2;var c,m=this.fontSize+2;var n=d.startAngle+(d.endAngle-d.startAngle)/2;"border"===this.position?c=(d.outerRadius-
k)/2+k:"outside"===this.position&&(c=d.outerRadius-k+k+m);n={x:d.x+Math.cos(n)*c,y:d.y+Math.sin(n)*c};if("outside"===this.position){n.x=n.x<d.x?n.x-m:n.x+m;var r=d.outerRadius+m}}else k=d.innerRadius,n=g.tooltipPosition();m=this.fontColor;"function"===typeof m?m=m({label:p.config.data.labels[f],value:a.data[f],percentage:q,text:e,backgroundColor:a.backgroundColor[f],dataset:a,index:f}):"string"!==typeof m&&(m=m[f]||this.options.defaultFontColor);if(this.arc)r||(r=(k+d.outerRadius)/2),b.fillStyle=
m,b.textBaseline="middle",this.drawArcText(e,r,d,this.overlap);else{k=this.measureText(e);d=n.x-k.width/2;k=n.x+k.width/2;var t=n.y-this.fontSize/2,u=n.y+this.fontSize/2;(this.overlap||("outside"===this.position?this.checkTextBound(d,k,t,u):g.inRange(d,t)&&g.inRange(d,u)&&g.inRange(k,t)&&g.inRange(k,u)))&&this.fillText(e,n,m)}b.restore()}}},c.prototype.parseOptions=function(a){var b=a.options.pieceLabel;return b?(this.chartInstance=a,this.ctx=a.chart.ctx,this.options=a.config.options,this.render=
b.render||b.mode,this.position=b.position||"default",this.arc=b.arc,this.format=b.format,this.precision=b.precision||0,this.fontSize=b.fontSize||this.options.defaultFontSize,this.fontColor=b.fontColor||this.options.defaultFontColor,this.fontStyle=b.fontStyle||this.options.defaultFontStyle,this.fontFamily=b.fontFamily||this.options.defaultFontFamily,this.hasTooltip=a.tooltip._active&&a.tooltip._active.length,this.showZero=b.showZero,this.overlap=b.overlap,this.images=b.images||[],this.showActualPercentages=
b.showActualPercentages||!1,!0):!1},c.prototype.checkTextBound=function(a,b,p,l){for(var h=this.labelBounds,f=0;f<h.length;++f){for(var g=h[f],d=[[a,p],[a,l],[b,p],[b,l]],e=0;e<d.length;++e){var c=d[e][0],k=d[e][1];if(c>=g.left&&c<=g.right&&k>=g.top&&k<=g.bottom)return!1}d=[[g.left,g.top],[g.left,g.bottom],[g.right,g.top],[g.right,g.bottom]];for(e=0;e<d.length;++e)if(c=d[e][0],k=d[e][1],c>=a&&c<=b&&k>=p&&k<=l)return!1}h.push({left:a,right:b,top:p,bottom:l});return!0},c.prototype.measureText=function(a){return"object"===
typeof a?{width:a.width,height:a.height}:this.ctx.measureText(a)},c.prototype.fillText=function(a,b,p){var c=this.ctx;"object"===typeof a?c.drawImage(a,b.x-a.width/2,b.y-a.height/2,a.width,a.height):(c.fillStyle=p,c.textBaseline="top",c.textAlign="center",c.fillText(a,b.x,b.y-this.fontSize/2))},c.prototype.loadImage=function(a){var b=new Image;b.src=a.src;b.width=a.width;b.height=a.height;return b},c.prototype.drawArcText=function(a,b,c,l){var h=this.ctx,f=c.x,g=c.y,d=c.startAngle;c=c.endAngle;h.save();
h.translate(f,g);g=c-d;d+=Math.PI/2;c+=Math.PI/2;var e=d;f=this.measureText(a);d+=(c-(f.width/b+d))/2;if(l||!(c-d>g))if("string"===typeof a)for(h.rotate(d),l=0;l<a.length;l++)d=a.charAt(l),f=h.measureText(d),h.save(),h.translate(0,-1*b),h.fillText(d,0,0),h.restore(),h.rotate(f.width/b);else h.rotate((e+c)/2),h.translate(0,-1*b),this.fillText(a,{x:0,y:0});h.restore()},Chart.pluginService.register({beforeInit:function(a){a.pieceLabel=new c},beforeDatasetsUpdate:function(a){a.pieceLabel.beforeDatasetsUpdate(a)},
afterDatasetsDraw:function(a){a.pieceLabel.afterDatasetsDraw(a)}}))})();