From 32fffdf91bfa69e3191e2d997ecc75c511d50269 Mon Sep 17 00:00:00 2001
From: Aaron Lindsay <aaron@aclindsay.com>
Date: Wed, 1 Mar 2017 20:35:20 -0500
Subject: [PATCH] Add PieChart

---
 js/components/PieChart.js | 136 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 js/components/PieChart.js

diff --git a/js/components/PieChart.js b/js/components/PieChart.js
new file mode 100644
index 0000000..d80fac9
--- /dev/null
+++ b/js/components/PieChart.js
@@ -0,0 +1,136 @@
+var d3 = require('d3');
+var React = require('react');
+
+var Slice = React.createClass({
+	displayName: "Slice",
+	render: function() {
+		if (this.props.angle > Math.PI*2 - 0.00001) {
+			var slice = (<circle cx={this.props.cx} cy={this.props.cy} r={this.props.radius}
+				className={this.props.className}
+				onClick={this.props.onClick} />);
+		} else {
+			var center = this.props.cx + " " + this.props.cy;
+			var dx = Math.cos(this.props.angle)*this.props.radius - this.props.radius;
+			var dy = Math.sin(this.props.angle)*this.props.radius - 0.00001;
+			var large_arc_flag = this.props.angle > Math.PI ? 1 : 0;
+			var rotateDegrees = this.props.startAngle * 180 / Math.PI;
+
+			slice = (<path d={"M" + center + " l " + this.props.radius + " 0 a " + this.props.radius + " " + this.props.radius + ", 0, " + large_arc_flag + ", 1, " + dx + " " + dy + " Z"}
+						className={this.props.className}
+						onClick={this.props.onClick} />);
+		}
+		return (
+			<g className="chart-series" transform={"rotate(" + rotateDegrees + " " + center + ")"}>
+				<title>{this.props.title}</title>
+				{slice}
+			</g>
+		);
+	}
+});
+
+module.exports = React.createClass({
+	displayName: "PieChart",
+	sortedSeries: function(series) {
+		// Return an array of the series names, from highest to lowest sums (in
+		// absolute terms)
+
+		var seriesNames = [];
+		var seriesValues = {};
+		for (var child in series) {
+			if (series.hasOwnProperty(child)) {
+				seriesNames.push(child);
+				seriesValues[child] = series[child].reduce(function(accum, curr, i, arr) {
+					return accum + curr;
+				}, 0);
+			}
+		}
+		seriesNames.sort(function(a, b) {
+			return seriesValues[b] - seriesValues[a];
+		});
+
+		return [seriesNames, seriesValues];
+	},
+	render: function() {
+		height = 400;
+		width = 600;
+		legendWidth = 100;
+		xMargin = 70;
+		yMargin = 70;
+		height -= yMargin*2;
+		width -= xMargin*2;
+		var radius = Math.min(height, width)/2;
+
+		var sortedSeriesValues = this.sortedSeries(this.props.report.FlattenedSeries);
+		var sortedSeries = sortedSeriesValues[0];
+		var seriesValues = sortedSeriesValues[1];
+		var r = d3.scaleLinear()
+			.range([0, 2*Math.PI])
+			.domain([0, sortedSeries.reduce(function(accum, curr, i, arr) {
+				return accum + Math.abs(seriesValues[curr]);
+			}, 0)]);
+
+		var slices = [];
+
+		// Add all the slices
+		var legendMap = {};
+		var childId=1;
+		var startAngle = 0;
+		for (var i=0; i < sortedSeries.length; i++) {
+			var child = sortedSeries[i];
+			var value = seriesValues[child];
+			if (value == 0)
+				continue;
+
+			var sliceClasses = "chart-element chart-color" + (childId % 12);
+			var self = this;
+			var sliceOnClick = function() {
+				var childName = child;
+				var onSelectSeries = self.props.onSelectSeries;
+				return function() {
+					onSelectSeries(childName);
+				};
+			}();
+
+			var radians = r(Math.abs(value));
+			var title = child + ": " + value;
+
+			slices.push((
+				<Slice key={"slice-" + childId} title={title}
+					className={sliceClasses}
+					cx={width/2}
+					cy={height/2}
+					startAngle={startAngle}
+					angle={radians}
+					radius={radius}
+					onClick={sliceOnClick}
+				/>
+			));
+			legendMap[child] = childId;
+			childId++;
+			startAngle += radians;
+		}
+
+		var legend = [];
+		for (var series in legendMap) {
+			var legendClasses = "chart-color" + (legendMap[series] % 12);
+			var legendY = (legendMap[series] - 1)*15;
+			legend.push((
+				<rect key={"legend-key-"+legendMap[series]} className={legendClasses} x={0} y={legendY} width={10} height={10}/>
+			));
+			legend.push((
+				<text key={"legend-label-"+legendMap[series]} x={0 + 15} y={legendY + 10}>{series}</text>
+			));
+		}
+
+		return (
+			<svg height={height + 2*yMargin} width={width + 2*xMargin + legendWidth}>
+				<g className="pie-chart" transform={"translate("+xMargin+" "+yMargin+")"}>
+					{slices}
+				</g>
+				<g className="chart-legend" transform={"translate("+(width + 2*xMargin)+" "+yMargin+")"}>
+					{legend}
+				</g>
+			</svg>
+		);
+	}
+});