packages/showcase/misc/voronoi-line-chart.js

// Copyright (c) 2016 - 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

import React from 'react';

import {
  XYPlot,
  XAxis,
  YAxis,
  HorizontalGridLines,
  VerticalGridLines,
  LineSeries,
  MarkSeries,
  Voronoi
} from 'react-vis';

const lines = [
  [
    {x: 1, y: 3},
    {x: 2, y: 5},
    {x: 3, y: 15},
    {x: 4, y: 12}
  ],
  [
    {x: 1, y: 10},
    {x: 2, y: 4},
    {x: 3, y: 2},
    {x: 4, y: 15}
  ],
  [
    {x: 1, y: 7},
    {x: 2, y: 11},
    {x: 3, y: 9},
    {x: 4, y: 2}
  ]
].map((p, i) => p.map(d => ({...d, line: i})));
const nodes = lines.reduce((acc, d) => [...acc, ...d], []);

const getDomain = (data, key) => {
  const {min, max} = data.reduce(
    (acc, row) => ({
      min: Math.min(acc.min, row[key]),
      max: Math.max(acc.max, row[key])
    }),
    {min: Infinity, max: -Infinity}
  );
  return [min, max];
};
const xDomain = getDomain(nodes, 'x');
const yDomain = getDomain(nodes, 'y');

export default class Example extends React.Component {
  state = {
    hoveredNode: null,
    showVoronoi: false
  };

  render() {
    const {hoveredNode, showVoronoi} = this.state;
    return (
      <div>
        <label style={{display: 'block'}}>
          <input
            type="checkbox"
            checked={showVoronoi}
            onChange={() => this.setState({showVoronoi: !showVoronoi})}
          />
          Show Voronoi
        </label>
        <XYPlot
          xDomain={xDomain}
          yDomain={yDomain}
          margin={{top: 10, left: 40, bottom: 40, right: 10}}
          width={300}
          height={300}
        >
          <HorizontalGridLines />
          <VerticalGridLines />
          <XAxis title="X Axis" />
          <YAxis title="Y Axis" />
          {lines.map((d, i) => (
            <LineSeries
              key={i}
              opacity={hoveredNode && hoveredNode.line === i ? 1 : 0.5}
              data={d}
            />
          ))}
          {hoveredNode && <MarkSeries data={[hoveredNode]} />}
          <Voronoi
            nodes={lines.reduce((acc, d) => [...acc, ...d], [])}
            onHover={node => this.setState({hoveredNode: node})}
            onBlur={() => this.setState({hoveredNode: null})}
            polygonStyle={{stroke: showVoronoi ? 'rgba(0, 0, 0, .2)' : null}}
          />
        </XYPlot>
      </div>
    );
  }
}