From d65c2157e6140e3983bcb7ad9507cd1c165159ad Mon Sep 17 00:00:00 2001
From: TJ Egan <twegan@us.ibm.com>
Date: Tue, 19 Sep 2017 11:29:45 -0500
Subject: [PATCH] feat(gauge): adds basic gauge graph

---
 components/GaugeGraph/GaugeGraph.js       | 100 ++++++++++++++++++++++
 components/GaugeGraph/GaugeGraph.story.js |  18 ++++
 2 files changed, 118 insertions(+)

diff --git a/components/GaugeGraph/GaugeGraph.js b/components/GaugeGraph/GaugeGraph.js
index e69de29b..6706165a 100644
--- a/components/GaugeGraph/GaugeGraph.js
+++ b/components/GaugeGraph/GaugeGraph.js
@@ -0,0 +1,100 @@
+import PropTypes from 'prop-types';
+import React, { Component } from 'react';
+import classnames from 'classnames';
+import * as d3 from 'd3';
+
+const propTypes = {
+  radius: PropTypes.number,
+  padding: PropTypes.number,
+  amount: PropTypes.number,
+  total: PropTypes.number,
+};
+
+const defaultProps = {
+  tau: 2 * Math.PI,
+  radius: 80,
+  padding: 30,
+  amount: 75,
+  total: 100,
+};
+
+class GaugeGraph extends Component {
+  state = {
+    tau: this.props.tau,
+    radius: this.props.radius,
+    padding: this.props.padding,
+    amount: this.props.amount,
+    total: this.props.total,
+  };
+
+  componentDidMount() {
+    const { radius, padding, amount, total } = this.state;
+
+    this.setState(() => {
+      return {
+        boxSize: (radius + padding) * 2,
+        ratio: amount / total,
+      };
+    }, this.initialRender);
+  }
+
+  initialRender() {
+    console.log(this.state);
+
+    this.renderSVG();
+  }
+
+  renderSVG() {
+    const { tau, radius, padding, boxSize, ratio } = this.state;
+
+    // Transition function
+    const arcTween = function(newAngle) {
+      return function(d) {
+        const interpolate = d3.interpolate(d.endAngle, newAngle);
+
+        return function(t) {
+          d.endAngle = interpolate(t);
+
+          return arc(d);
+        };
+      };
+    };
+
+    const arc = d3
+      .arc()
+      .innerRadius(radius)
+      .outerRadius(radius - 10)
+      .startAngle(0);
+
+    this.svg = d3
+      .select(this.refs.container)
+      .attr('width', boxSize)
+      .attr('height', boxSize)
+      .append('g')
+      .attr('transform', `translate(${boxSize / 2}, ${boxSize / 2})`);
+
+    this.svg
+      .append('path')
+      .datum({ endAngle: tau })
+      .style('fill', '#dfe3e6')
+      .attr('d', arc);
+
+    this.svg
+      .append('path')
+      .datum({ endAngle: 0 })
+      .style('fill', '#FE8500')
+      .transition()
+      .duration(1000)
+      .delay(1000)
+      .attrTween('d', arcTween(ratio * tau));
+  }
+
+  render() {
+    return <svg ref="container" />;
+  }
+}
+
+GaugeGraph.propTypes = propTypes;
+GaugeGraph.defaultProps = defaultProps;
+
+export default GaugeGraph;
diff --git a/components/GaugeGraph/GaugeGraph.story.js b/components/GaugeGraph/GaugeGraph.story.js
index e69de29b..2b02aa9f 100644
--- a/components/GaugeGraph/GaugeGraph.story.js
+++ b/components/GaugeGraph/GaugeGraph.story.js
@@ -0,0 +1,18 @@
+import React from 'react';
+import { storiesOf, action } from '@storybook/react';
+import GaugeGraph from './GaugeGraph';
+
+const props = {
+  radius: 80,
+  padding: 30,
+  amount: 75,
+  total: 100,
+};
+
+storiesOf('GaugeGraph', module).addWithInfo(
+  'Default',
+  `
+      Gauge Graph.
+    `,
+  () => <GaugeGraph {...props} />
+);