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React Native Chart Kit Documentation

Import components

1. yarn add react-native-chart-kit
2. yarn add react-native-svg prop-types install peer dependencies
3. Use with ES6 syntax to import components

import {
  LineChart,
  BarChart,
  PieChart,
  ProgressChart,
  ContributionGraph,
  StackedBarChart
} 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}
    yAxisLabel="$"
    yAxisSuffix="k"
    chartConfig={{
      backgroundColor: "#e26a00",
      backgroundGradientFrom: "#fb8c00",
      backgroundGradientTo: "#ffa726",
      decimalPlaces: 2, // optional, defaults to 2dp
      color: (opacity = 1) => `rgba(255, 255, 255, ${opacity})`,
      labelColor: (opacity = 1) => `rgba(255, 255, 255, ${opacity})`,
      style: {
        borderRadius: 16
      },
      propsForDots: {
        r: "6",
        strokeWidth: "2",
        stroke: "#ffa726"
      }
    }}
    bezier
    style={{
      marginVertical: 8,
      borderRadius: 16
    }}
  />
</View>

Chart style object

Define a chart style object with following properies as such:

const chartConfig = {
  backgroundGradientFrom: "#1E2923",
  backgroundGradientFromOpacity: 0,
  backgroundGradientTo: "#08130D",
  backgroundGradientToOpacity: 0.5,
  color: (opacity = 1) => `rgba(26, 255, 146, ${opacity})`,
  strokeWidth: 2, // optional, default 3
  barPercentage: 0.5
};

| Property | Type | Description | | ----------------------------- | ------------------ | ------------------------------------------------------------------------------------------------------ | | backgroundGradientFrom | string | Defines the first color in the linear gradient of a chart's background | | backgroundGradientFromOpacity | Number | Defines the first color opacity in the linear gradient of a chart's background | | backgroundGradientTo | string | Defines the second color in the linear gradient of a chart's background | | backgroundGradientToOpacity | Number | Defines the second color opacity in the linear gradient of a chart's background | | fillShadowGradient | string | Defines the color of the area under data | | fillShadowGradientOpacity | Number | Defines the initial opacity of the area under data | | color | function => string | Defines the base color function that is used to calculate colors of labels and sectors used in a chart | | strokeWidth | Number | Defines the base stroke width in a chart | | barPercentage | Number | Defines the percent (0-1) of the available width each bar width in a chart | | barRadius | Number | Defines the radius of each bar | | propsForBackgroundLines | props | Override styles of the background lines, refer to react-native-svg's Line documentation | | propsForLabels | props | Override styles of the labels, refer to react-native-svg's Text documentation |

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],
      color: (opacity = 1) => `rgba(134, 65, 244, ${opacity})`, // optional
      strokeWidth: 2 // optional
    }
  ],
  legend: ["Rainy Days", "Sunny Days", "Snowy Days"] // optional
};

<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 | | withDots | boolean | Show dots on the line - default: True | | withShadow | boolean | Show shadow for line - default: True | | withInnerLines | boolean | Show inner dashed lines - default: True | | withOuterLines | boolean | Show outer dashed lines - default: True | | withVerticalLabels | boolean | Show vertical labels - default: True | | withHorizontalLabels | boolean | Show horizontal labels - default: True | | fromZero | boolean | Render charts from 0 not from the minimum value. - default: False | | yAxisLabel | string | Prepend text to horizontal labels -- default: '' | | yAxisSuffix | string | Append text to horizontal labels -- default: '' | | xAxisLabel | string | Prepend text to vertical labels -- default: '' | | chartConfig | Object | Configuration object for the chart, see example config object above | | decorator | Function | This function takes a whole bunch of stuff and can render extra elements, such as data point info or additional markup. | | onDataPointClick | Function | Callback that takes {value, dataset, getColor} | | horizontalLabelRotation | number (degree) | Rotation angle of the horizontal labels - default 0 | | verticalLabelRotation | number (degree) | Rotation angle of the vertical labels - default 0 | | getDotColor | function => string | Defines the dot color function that is used to calculate colors of dots in a line chart and takes (dataPoint, dataPointIndex) | | renderDotContent | Function | Render additional content for the dot. Takes ({x, y, index}) as arguments. | | yLabelsOffset | number | Offset for Y axis labels | | xLabelsOffset | number | Offset for X axis labels | | hidePointsAtIndex | number[] | Indices of the data points you don't want to display | | formatYLabel | Function | This function change the format of the display value of the Y label. Takes the Y value as argument and should return the desirable string. | | formatXLabel | Function | This function change the format of the display value of the X label. Takes the X value as argument and should return the desirable string. | | getDotProps | (value, index) => props | This is an alternative to chartConfig's propsForDots | | segments | number | The amount of horizontal lines - default 4 |

Bezier Line Chart

<LineChart
  data={data}
  width={screenWidth}
  height={256}
  verticalLabelRotation={30}
  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 = {
  labels: ["Swim", "Bike", "Run"], // optional
  data: [0.4, 0.6, 0.8]
};

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

| 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 | | hideLegend | Boolean | Switch to hide chart legend (defaults to false) |

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}
  yAxisLabel="$"
  chartConfig={chartConfig}
  verticalLabelRotation={30}
/>

| 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 | | withVerticalLabels | boolean | Show vertical labels - default: True | | withHorizontalLabels | boolean | Show horizontal labels - default: True | | fromZero | boolean | Render charts from 0 not from the minimum value. - default: False | | withInnerLines | boolean | Show inner dashed lines - default: True | | yAxisLabel | string | Prepend text to horizontal labels -- default: '' | | yAxisSuffix | string | Append text to horizontal labels -- default: '' | | chartConfig | Object | Configuration object for the chart, see example config in the beginning of this file | | horizontalLabelRotation | number (degree) | Rotation angle of the horizontal labels - default 0 | | verticalLabelRotation | number (degree) | Rotation angle of the vertical labels - default 0 | | showBarTops | boolean | Show bar tops |

StackedBar chart

const data = {
  labels: ["Test1", "Test2"],
  legend: ["L1", "L2", "L3"],
  data: [[60, 60, 60], [30, 30, 60]],
  barColors: ["#dfe4ea", "#ced6e0", "#a4b0be"]
};

<StackedBarChart
  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 | | withVerticalLabels | boolean | Show vertical labels - default: True | | withHorizontalLabels | boolean | Show horizontal labels - default: True | | chartConfig | Object | Configuration object for the chart, see example config in the beginning of this file | | barPercentage | Number | Defines the percent (0-1) of the available width each bar width in a chart | | showLegend | boolean | Show legend - default: True |

Pie chart

Modified Pie Chart Screenshot

const data = [
  {
    name: "Seoul",
    population: 21500000,
    color: "rgba(131, 167, 234, 1)",
    legendFontColor: "#7F7F7F",
    legendFontSize: 15
  },
  {
    name: "Toronto",
    population: 2800000,
    color: "#F00",
    legendFontColor: "#7F7F7F",
    legendFontSize: 15
  },
  {
    name: "Beijing",
    population: 527612,
    color: "red",
    legendFontColor: "#7F7F7F",
    legendFontSize: 15
  },
  {
    name: "New York",
    population: 8538000,
    color: "#ffffff",
    legendFontColor: "#7F7F7F",
    legendFontSize: 15
  },
  {
    name: "Moscow",
    population: 11920000,
    color: "rgb(0, 0, 255)",
    legendFontColor: "#7F7F7F",
    legendFontSize: 15
  }
];

<PieChart
  data={data}
  width={screenWidth}
  height={220}
  chartConfig={chartConfig}
  accessor="population"
  backgroundColor="transparent"
  paddingLeft="15"
  absolute
/>

| 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 | | bgColor | string | background color - if you want to set transparent, input transparent or none. | | paddingLeft | string | left padding of the pie chart | | absolute | boolean | shows the values as absolute numbers | | hasLegend | boolean | Defaults to true, set it to false to remove the legend |

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,
  // 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,
  // first color opacity of background gradient (0 - 1.0)
  backgroundGradientFromOpacity: Number,
  // second color of background gradient
  backgroundGradientTo: String,
  // second color opacity of background gradient (0 - 1.0)
  backgroundGradientToOpacity: Number,
}

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)

Contribute

See the contribution guide and join the contributors!