react-native-chart-kit-samxu

React Native Chart Kit Documentation

Import components

• yarn add react-native-chart-kit
• Use with ES6 syntax to import components

import {
  LineChart,
  BarChart,
  PieChart,
  ProgressChart,
  ContributionGraph
} from 'react-native-chart-kit'

Quick Example

<View>
  <Text>
    Bezier Line Chart
  </Text>
  <LineChart
    data={{
      labels: ['January', 'February', 'March', 'April', 'May', 'June'],
      datasets: [{
        data: [
          Math.random() * 100,
          Math.random() * 100,
          Math.random() * 100,
          Math.random() * 100,
          Math.random() * 100,
          Math.random() * 100
        ]
      }]
    }}
    width={Dimensions.get('window').width} // from react-native
    height={220}
    chartConfig={{
      backgroundColor: '#e26a00',
      backgroundGradientFrom: '#fb8c00',
      backgroundGradientTo: '#ffa726',
      color: (opacity = 1) => `rgba(255, 255, 255, ${opacity})`,
      style: {
        borderRadius: 16
      }
    }}
    bezier
    style={{
      marginVertical: 8,
      borderRadius: 16
    }}
  />
</View>

Chart style object

Define a chart style object with following properies as such:

const chartConfig = {
  backgroundGradientFrom: '#1E2923',
  backgroundGradientTo: '#08130D',
  color: (opacity = 1) => `rgba(26, 255, 146, ${opacity})`
}

Property	Type	Description
backgroundGradientFrom	string	Defines the first color in the linear gradient of a chart's background
backgroundGradientTo	string	Defines the second color in the linear gradient of a chart's background
color	function => string	Defines the base color function that is used to calculate colors of labels and sectors used in a chart

Responsive charts

To render a responsive chart, use Dimensions react-native library to get the width of the screen of your device like such

import { Dimensions } from 'react-native'
const screenWidth = Dimensions.get('window').width

Line Chart

const data = {
  labels: ['January', 'February', 'March', 'April', 'May', 'June'],
  datasets: [{
    data: [ 20, 45, 28, 80, 99, 43 ]
  }]
}

<LineChart
  data={data}
  width={screenWidth}
  height={220}
  chartConfig={chartConfig}
/>

Property	Type	Description
data	Object	Data for the chart - see example above
width	Number	Width of the chart, use 'Dimensions' library to get the width of your screen for responsive
height	Number	Height of the chart
chartConfig	Object	Configuration object for the chart, see example config object above

Bezier Line Chart

<LineChart
  data={data}
  width={screenWidth}
  height={220}
  chartConfig={chartConfig}
  bezier
/>

Property	Type	Description
bezier	boolean	Add this prop to make the line chart smooth and curvy

Progress Ring

// each value represents a goal ring in Progress chart
const data = [0.4, 0.6, 0.8]

<ProgressChart
  data={data}
  width={screenWidth}
  height={220}
  chartConfig={chartConfig}
/>

Property	Type	Description
data	Object	Data for the chart - see example above
width	Number	Width of the chart, use 'Dimensions' library to get the width of your screen for responsive
height	Number	Height of the chart
chartConfig	Object	Configuration object for the chart, see example config in the beginning of this file

Bar chart

const data = {
  labels: ['January', 'February', 'March', 'April', 'May', 'June'],
  datasets: [{
    data: [ 20, 45, 28, 80, 99, 43 ]
  }]
}

<BarChart
  style={graphStyle}
  data={data}
  width={screenWidth}
  height={220}
  chartConfig={chartConfig}
/>

Property	Type	Description
data	Object	Data for the chart - see example above
width	Number	Width of the chart, use 'Dimensions' library to get the width of your screen for responsive
height	Number	Height of the chart
chartConfig	Object	Configuration object for the chart, see example config in the beginning of this file

Pie chart

const data = [
  { name: 'Toronto', population: 2800000  },
  { name: 'Dublin', population: 527612 },
  { name: 'New York', population: 8538000 },
  { name: 'Beijing', population: 21500000 },
  { name: 'Moscow', population: 11920000 }
]

<PieChart
  data={data}
  width={screenWidth}
  height={220}
  chartConfig={chartConfig}
  accessor="population"
/>

Property	Type	Description
data	Object	Data for the chart - see example above
width	Number	Width of the chart, use 'Dimensions' library to get the width of your screen for responsive
height	Number	Height of the chart
chartConfig	Object	Configuration object for the chart, see example config in the beginning of this file
accessor	string	Property in the data object from which the number values are taken

Contribution graph (heatmap)

This type of graph is often use to display a developer contribution activity. However, there many other use cases this graph is used when you need to visualize a frequency of a certain event over time.

const commitsData = [
  { date: '2017-01-02', count: 1 },
  { date: '2017-01-03', count: 2 },
  { date: '2017-01-04', count: 3 },
  { date: '2017-01-05', count: 4 },
  { date: '2017-01-06', count: 5 },
  { date: '2017-01-30', count: 2 },
  { date: '2017-01-31', count: 3 },
  { date: '2017-03-01', count: 2 },
  { date: '2017-04-02', count: 4 },
  { date: '2017-03-05', count: 2 },
  { date: '2017-02-30', count: 4 }
]

<ContributionGraph
  values={commitsData}
  endDate={new Date('2017-04-01')}
  numDays={105}
  width={screenWidth}
  height={220}
  chartConfig={chartConfig}
/>

Property	Type	Description
data	Object	Data for the chart - see example above
width	Number	Width of the chart, use 'Dimensions' library to get the width of your screen for responsive
height	Number	Height of the chart
chartConfig	Object	Configuration object for the chart, see example config in the beginning of this file
accessor	string	Property in the data object from which the number values are taken

More styling

Every charts also accepts style props, which will be applied to parent svg or View component of each chart.

Abstract Chart

src/abstract-chart.js is an extendable class which can be used to create your own charts!

The following methods are available:

renderHorizontalLines(config)

Renders background horizontal lines like in the Line Chart and Bar Chart. Takes a config object with following properties:

{
  // width of your chart
  width: Number,
  // height of your chart
  height: Number,
  // how many lines to render
  count: Number,
  // how many labels there will be on X axes - used to calculate offsets between the lines
  labelCount: Number,
  // top padding from the chart top edge
  paddingTop: Number
}

renderVerticalLabels(config)

Render background vertical lines. Takes a config object with following properties:

{
  // data needed to calculate the number of lines to render
  data: Array,
  // width of your chart
  width: Number,
  // height of your chart
  height: Number,
  paddingTop: Number,
  paddingRight: Number
}

renderDefs(config)

Render definitions of background and shadow gradients

{
  // width of your chart
  width: Number,
  // height of your chart
  height: Number,
  // first color of background gradient
  backgroundGradientFrom: String,
  // second color of background gradient
  backgroundGradientTo: String
}

More information

This library is built on top of the following open-source projects:

• react-native-svg (https://github.com/react-native-community/react-native-svg)
• paths-js (https://github.com/andreaferretti/paths-js)
• react-native-calendar-heatmap (https://github.com/ayooby/react-native-calendar-heatmap)