react-native-pathjs-charts/src/Tree.js

Cross platform React Native charting library based on path-js and react-native-svg

/*
Copyright 2016 Capital One Services, LLC

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and limitations under the License.

SPDX-Copyright: Copyright (c) Capital One Services, LLC
SPDX-License-Identifier: Apache-2.0
*/

import React, {Component} from 'react'
import {Text as ReactText}  from 'react-native'
import Svg,{ Circle, G, Path, Text } from 'react-native-svg'
import { Options, styleSvg, fontAdapt } from './util'
import _ from 'lodash'
const Tree = require('paths-js/tree')

function children(x) {
  if(x.collapsed) {
    return []
  }
  else {
    return x.children || []
  }
}

export default class TreeChart extends Component {

  static defaultProps = {
    options: {
      margin: {top: 20, left: 50, right: 80, bottom: 20},
      width: 600,
      height: 600,
      fill: '#2980B9',
      stroke: '#3E90F0',
      r: 5,
      animate: {
        type: 'oneByOne',
        duration: 200,
        fillTransition: 3
      },
      label: {
        fontFamily: 'Arial',
        fontSize: 14,
        bold: true,
        fill: '#34495E'
      }
    }
  }

  render() {
    const noDataMsg = this.props.noDataMessage || 'No data available'
    if (this.props.data === undefined) return (<ReactText>{noDataMsg}</ReactText>)

    const options = new Options(this.props)
    const tree = Tree({
      data: this.props.data,
      children: children,
      width: options.chartWidth,
      height: options.chartHeight
    })
    const colors = styleSvg({},options)
    const curves = _.map(tree.curves,function (c,i) {
      return <Path key={'curves_' + i} d={ c.connector.path.print() } fill="none" stroke={colors.stroke} strokeOpacity={colors.strokeOpacity} />
    })

    const fillOpacityStyle = 1
    const textStyle = fontAdapt(options.label)
    const r = options.r || 5
    const nodes = _.map(tree.nodes,function (n,index) {

      let text

      if (children(n.item).length > 0) {
        text = <Text fontFamily={textStyle.fontFamily}
              fontSize={textStyle.fontSize}
              fontWeight={textStyle.fontWeight}
              fontStyle={textStyle.fontStyle}  x={-10} y={-10} textAnchor="end">{ n.item.name }</Text>
      } else {
        text = <Text fontFamily={textStyle.fontFamily}
              fontSize={textStyle.fontSize}
              fontWeight={textStyle.fontWeight}
              fontStyle={textStyle.fontStyle} x={10} y={-10} textAnchor="start">{ n.item.name }</Text>
      }

      return (<G key={'tree_' + index} x={n.point[0]} y={n.point[1]}>
                  <Circle fillOpacity={fillOpacityStyle} {...colors} r={r} cx="0" cy="0" />
                  { text }
              </G>)
    })

    return (
            <Svg width={options.width} height={options.height}>
                <G x={options.margin.left} y={options.margin.top}>
                    { curves }
                    { nodes }
                </G>
            </Svg>
        )
  }
}