A sweet & simple chart library for React Native

react-native-wagmi-charts

A sweet & simple chart library for React Native that will make us feel like We're All Gonna Make It

Features

? Line charts & candlestick charts (more to come ?)

? Interactive price & date/time label components

? Built with composability in mind

? Highly customizable APIs

✨ Uses React Native Reanimated 2 under-the-hood

? Slick data transition animations

? Interactive tooltips

Install

To get started with using WAGMI charts in your React Native project, install the react-native-wagmi-charts package.

npm install react-native-wagmi-charts

WAGMI charts also depends on a few libraries, you will also need to install these packages if you don't already have them:

npm install react-native-reanimated react-native-gesture-handler react-native-haptic-feedback

Basic Usage

The library currently comes with 2 types of charts: Line & Candlestick. Below are the most basic usages of them.

Line chart

To render a simple line chart, you will need to use the LineChart.Provider, LineChart & LineChart.Path components.

The LineChart.Provider component sets up the context of your chart, LineChart composes the chart elements, and the LineChart.Path component renders your data in the form of a line path.

Note: This chart does not include an interactive cursor like in the animated example above. If you want one, check out the "Interactive Cursors" guide

import { LineChart } from 'react-native-wagmi-charts'; 

const data = [
  {
    timestamp: 1625945400000,
    value: 33575.25
  },
  {
    timestamp: 1625946300000,
    value: 33545.25
  },
  {
    timestamp: 1625947200000,
    value: 33510.25
  },
  {
    timestamp: 1625948100000,
    value: 33215.25
  }
]

function Example() {
  return (
    <LineChart.Provider data={data}>
      <LineChart>
        <LineChart.Path />
      </LineChart>
    </LineChart.Provider>
  )
}

Candlestick chart

To render a simple candlestick chart, you will need to use the CandlestickChart & CandlestickChart.Candles components.

The CandlestickChart.Provider component sets up the context of your chart, CandlestickChart composes the chart elements, and the CandlestickChart.Candles component renders your data in the form of a line path.

Note: This chart does not include an interactive cursor like in the animated example above. If you want one, check out the "Interactive Cursors" guide

import { CandlestickChart } from 'react-native-wagmi-charts'; 

const data = [
  {
    timestamp: 1625945400000,
    open: 33575.25,
    high: 33600.52,
    low: 33475.12,
    close: 33520.11
  },
  {
    timestamp: 1625946300000,
    open: 33545.25,
    high: 33560.52,
    low: 33510.12,
    close: 33520.11
  },
  {
    timestamp: 1625947200000,
    open: 33510.25,
    high: 33515.52,
    low: 33250.12,
    close: 33250.11
  },
  {
    timestamp: 1625948100000,
    open: 33215.25,
    high: 33430.52,
    low: 33215.12,
    close: 33420.11
  }
]

function Example() {
  return (
    <CandlestickChart.Provider data={data}>
      <CandlestickChart>
        <CandlestickChart.Candles />
      </CandlestickChart>
    </CandlestickChart.Provider>
  )
}

Guides

Below are some guides to help you make your charts suit your brand. Hopefully a combination of the below will enable you to make a great chart! :-)

Interactive cursors

Line chart

To render an interactive cursor on your line chart, you can include either the LineChart.CursorCrosshair or LineChart.CursorLine components:

`LineChart.CursorCrosshair`

<LineChart.Provider data={data}>
  <LineChart>
    <LineChart.Path />
    <LineChart.CursorCrosshair />
  </LineChart>
</LineChart.Provider>

`LineChart.CursorLine`

<LineChart.Provider data={data}>
  <LineChart>
    <LineChart.Path />
    <LineChart.CursorLine />
  </LineChart>
</LineChart.Provider>

Candlestick chart

To render an interactive cursor on your candlestick chart, you can include the CandlestickChart.Crosshair component:

`CandlestickChart.Crosshair`

<CandlestickChart.Provider data={data}>
  <CandlestickChart>
    <CandlestickChart.Candles />
    <CandlestickChart.Crosshair />
  </CandlestickChart>
</CandlestickChart.Provider>

Interactive labels

Line chart

To render an interactive label on your line chart as your cursor moves along the graph, you can use the PriceText or DatetimeText components:

Note: These components must be within the LineChart.Provider component.

<LineChart.Provider data={data}>
  <LineChart>
    <LineChart.Path />
    <LineChart.CursorCrosshair />
  </LineChart>
  <LineChart.PriceText />
  <LineChart.DatetimeText />
</LineChart.Provider>

Candlestick chart

To render an interactive label on your candlestick chart, you can use the PriceText or DatetimeText components:

Note: These components must be within the CandlestickChart.Provider component.

<CandlestickChart.Provider data={data}>
  <CandlestickChart>
    <CandlestickChart.Candles />
    <CandlestickChart.Crosshair />
  </CandlestickChart>
  <CandlestickChart.PriceText type="open" />
  <CandlestickChart.PriceText type="high" />
  <CandlestickChart.PriceText type="low" />
  <CandlestickChart.PriceText type="close" />
  <CandlestickChart.DatetimeText />
</LineChart.Provider>

Interactive tooltips

Line charts

To render an interactive tooltip that follows your cursor, you can use the Tooltip component.

<LineChart.Provider data={data}>
  <LineChart>
    <LineChart.Path />
    <LineChart.CursorCrosshair>
      <LineChart.Tooltip />
    </LineChart.CursorCrosshair>
  </LineChart>
</LineChart.Provider>

You can even add another tooltip to show something like date/time:

<LineChart.Provider data={data}>
  <LineChart>
    <LineChart.Path />
    <LineChart.CursorCrosshair>
      <LineChart.Tooltip />
      <LineChart.Tooltip position="bottom">
        <LineChart.DatetimeText />
      </LineChart.Tooltip>
    </LineChart.CursorCrosshair>
  </LineChart>
</LineChart.Provider>

Candlestick charts

To render an interactive tooltip that follows your crosshair, you can use the Tooltip component.

<CandlestickChart.Provider data={data}>
  <CandlestickChart>
    <CandlestickChart.Candles />
    <CandlestickChart.Crosshair>
      <CandlestickChart.Tooltip />
    </CandlestickChart.Crosshair>
  </CandlestickChart>
</CandlestickChart.Provider>

Colors

By default, the charts come with default colors out-of-the-box... But you probably will want to change these to suit your brand.

Line charts

Coloring the path

To customise the color of the line chart path, supply a color prop to LineChart.Path. This can be any valid React Native StyleSheet compatible color.

<LineChart.Provider data={data}>
  <LineChart>
    <LineChart.Path color="hotpink" />
  </LineChart>
</LineChart.Provider>

Coloring the cursor

To customise the color of the line chart cursor, supply a color prop to LineChart.CursorCrosshair. This can be any valid React Native StyleSheet compatible color.

Note: This also works for LineChart.CursorLine

<LineChart.Provider data={data}>
  <LineChart>
    <LineChart.Path color="hotpink" />
    <LineChart.CursorCrosshair color="hotpink />
  </LineChart>
</LineChart.Provider>

Candlestick charts

Coloring the candles

To customise the color of the candlestick chart candles, supply a negativeColor and a positiveColor to CandlestickChart.Candles. This can be any valid React Native StyleSheet compatible color.

<CandlestickChart.Provider data={data}>
  <CandlestickChart>
    <CandlestickChart.Candles positiveColor="hotpink" negativeColor="black" />
  </CandlestickChart>
</CandlestickChart.Provider>

Coloring the crosshair

To customise the color of the line chart cursor, supply a color prop to CandlestickChart.Crosshair. This can be any valid React Native StyleSheet compatible color.

<CandlestickChart.Provider data={data}>
  <CandlestickChart>
    <CandlestickChart.Candles positiveColor="hotpink" negativeColor="black" />
    <CandlestickChart.Crosshair color="hotpink" />
  </CandlestickChart>
</CandlestickChart.Provider>

Customizing size

You can modify the width & height of the charts by providing width and height props to LineChart or CandlestickChart. Your chart should adapt to it's size.

<LineChart.Provider data={data}>
  <LineChart width={150} height={150}>
    <LineChart.Path />
  </LineChart>
</LineChart.Provider>

Customizing labels

Price labels

Precision

By default, the price labels have a precision of 2, meaning that the prices will always be to 2 decimal places. However, you can customize this with the precision prop:

<LineChart.PriceText precision={4} />
<CandlestickChart.PriceText precision={4} />

Custom formatting

To customize the formatting of the price text, you can supply a format function in the form of a reanimated worklet:

Note: due to the nature of reanimated worklets, you cannot define functions that run on the React Native JS thread. Read more here

<LineChart.PriceText
  format={({ value }) => {
    'worklet';
    const formattedPrice = yourOwnFormatValueFn(value);
    return `$${formattedPrice} AUD`;
  }}
/>

Datetime labels

Date/time options

Internally, WAGMI charts uses Date.prototype.toLocaleString() to generate the date/time label. You can customise it's options like so:

<LineChart.DatetimeText
  locale="en-AU"
  options={{
    year: 'numeric',
    month: 'numeric',
    day: 'numeric',
    hour: 'numeric',
    minute: 'numeric',
    second: 'numeric',
  }}
/>

Custom formatting

To customize the formatting of the date/time text, you can supply a format function in the form of a reanimated worklet:

Note: due to the nature of reanimated worklets, you cannot define functions that run on the React Native JS thread. Read more here

<LineChart.DatetimeText
  format={({ value }) => {
    'worklet';
    const formattedDate = yourOwnFormatValueFn(value);
    return formattedDate;
  }}
/>

Customizing tooltips

Style

You can customize the style of the tooltip by providing the textStyle prop:

<LineChart.Tooltip
  style={{
    backgroundColor: 'black',
    borderRadius: 4,
    color: 'white',
    fontSize: 18,
    padding: 4,
  }}
/>

Gutter

You can customize the gutters of the tooltip by providing cursorGutter, xGutter or yGutter.

cursorGutter is the gutter between the cursor and the tooltip.

xGutter and yGutter is the gutter on the x & y axis of the chart (the tooltip can't pass the gutter).

<LineChart.Tooltip 
  cursorGutter={60} 
  xGutter={16} 
  yGutter={16} 
/>

Component APIs

LineChart.Provider

Prop	Type	Default	Description
`data`	`Array<{ timestamp: number, value: number }>`		The line chart data as an array of timestamps & values (prices).

LineChart

Prop	Type	Default	Description
`width`	`number`	Width of device screen	The width of the chart
`height`	`number`	Height of device screen	The height of the chart
`yGutter`	`number`	`16`	The gutter of the chart on the Y axis (the chart data will not exceed it's gutter)
`shape`	`function`	`shape.curveBumpX`	The shape type/curve of the graph. Accepts a curve function from d3-shape
`...props`	`ViewProps`		This component also inherits React Native's `View` props.

LineChart.Path

Prop	Type	Default	Description
`color`	`string`	`"black"`	Color of the line path
`width`	`number`	`3`	Width of the line path
`...props`	`PathProps`		This component also inherits React Native SVG's `Path` props.

LineChart.CursorCrosshair

Prop	Type	Default	Description
`color`	`string`	`"black"`	Color of the crosshair dot
`size`	`number`	`8`	Size of the crosshair dot
`outerSize`	`number`	`32`	Size of the outer crosshair dot (faded dot)
`crosshairWrapperProps`	`ViewProps`		Props of the wrapper component of the crosshair
`crosshairProps`	`ViewProps`		Props of the crosshair dot
`crosshairOuterProps`	`ViewProps`		Props of the crosshair outer dot

LineChart.CursorLine

Prop	Type	Default	Description
`color`	`string`	`"gray"`	Color of the cursor line
`lineProps`	`LineProps`		Props of the cursor line. Takes React Native SVG's `Line` props.

LineChart.Tooltip

Prop	Type	Default	Description
`xGutter`	`number`	`8`	X axis gutter in which the tooltip will not pass.
`yGutter`	`number`	`8`	Y axis gutter in which the tooltip will not pass.
`cursorGutter`	`number`	`48`	Gutter (spacing) between the cursor and the tooltip.
`position`	`"top" \| "bottom"`	`"top"`	Position of the tooltip relative to the cursor.

LineChart.PriceText

Prop	Type	Default	Description
`format`	`({ value, formatted }) => string`		Custom format function of the price.
`precision`	`number`	`2`	Default precision of the price.
`variant`	`"formatted" \| "value"`	`"formatted"`	Default representation of the price value.
`...props`	`TextProps`		Inherits React Native's `Text` props

LineChart.DatetimeText

Prop	Type	Default	Description
`format`	`({ value, formatted }) => string`		Custom format function of the timestamp.
`locale`	`string`	`"en-US"`	Locale of the timestamp.
`options`	`{}`		Options to pass to `toLocaleString()`. Available options are here
`style`	`{}`		Style of the price text
`variant`	`"formatted" \| "value"`	`"formatted"`	Default representation of the timestamp value.

CandlestickChart.Provider

Prop	Type	Default	Description
`data`	`Array<{ timestamp: number, open: number, high: number, low: number, close: number }>`		The candlestick chart data as an array of timestamps & values (prices).

CandlestickChart

Prop	Type	Default	Description
`width`	`number`	Width of device screen	The width of the chart
`height`	`number`	Height of device screen	The height of the chart
`...props`	`ViewProps`		This component also inherits React Native's `View` props.

CandlestickChart.Candles

Prop	Type	Default	Description
`positiveColor`	`string`	`#10b981`	Color of the positive candles
`negativeColor`	`string`	`#ef4444`	Color of the negative candles
`rectProps`	`RectProps`		Props of the SVG Rectangle. Takes React Native's SVG `Rect` props.
`lineProps`	`LineProps`		Props of the SVG Line. Takes React Native's SVG `Line` props.
`renderRect`	`({ x: number, y: number, width: number, height: number, fill: string }) => React.ReactNode`		Renders a custom rect component
`renderLine`	`({ x1: number, x2: number, y1: number, y2: number, stroke: string, strokeWidth: number }) => React.ReactNode`		Renders a custom line component
`...props`	`SvgProps`		This component also inherits React Native SVG's `Svg` props.

CandlestickChart.Crosshair

Prop	Type	Default	Description
`color`	`string`	`"black"`	Color of the crosshair

CandlestickChart.Tooltip

Prop	Type	Default	Description
`xGutter`	`number`	`8`	X axis gutter in which the tooltip will not pass.
`yGutter`	`number`	`8`	Y axis gutter in which the tooltip will not pass.
`tooltipTextProps`	`PriceTextProps`		Props of the tooltip (price) text.
`textStyle`	`{}`		Style of the tooltip text

CandlestickChart.PriceText

Prop	Type	Default	Description
`format`	`({ value, formatted }) => string`		Custom format function of the price.
`precision`	`number`	`2`	Default precision of the price.
`variant`	`"formatted" \| "value"`	`"formatted"`	Default representation of the price value.
`...props`	`TextProps`		Inherits React Native's `Text` props

CandlestickChart.DatetimeText

Prop	Type	Default	Description
`format`	`({ value, formatted }) => string`		Custom format function of the timestamp.
`locale`	`string`	`"en-US"`	Locale of the timestamp.
`options`	`{}`		Options to pass to `toLocaleString()`. Available options are here
`style`	`{}`		Style of the price text
`variant`	`"formatted" \| "value"`	`"formatted"`	Default representation of the timestamp value.

Hooks

The following hooks are only accessible inside the LineChart.Provider or CandlestickChart.Provider.

LineChart.useChart

The LineChart.useChart hook returns the current state of the chart.

const {
  currentX,     
  currentY,     
  currentIndex, 
  data,         
  domain,       
  isActive      
} = LineChart.useChart();

Reference

Returns

Variable	Type	Description
`currentX`	`Animated.SharedValue<number>`	Current x position
`currentY`	`Animated.SharedValue<number>`	Current y position
`currentIndex`	`Animated.SharedValue<number>`	Current index of the data
`data`	`Array<{ timestamp: number, value: number }>`	Data of the chart
`domain`	`[number, number]`	Y domain of the chart
`isActive`	`Animated.SharedValue<boolean>`	Is the chart active by gesture?

LineChart.useDatetime

const {
  value,
  formatted
} = LineChart.useDatetime({
  format,
  locale,
  options
})

Reference

Arguments

Variable	Type	Default	Description
`format`	`({ value, formatted }) => string`		Custom format function of the timestamp.
`locale`	`string`	`"en-US"`	Locale of the timestamp.
`options`	`{}`		Options to pass to `toLocaleString()`. Available options are here

Returns

Variable	Type	Default	Description
`value`	`string`		Timestamp value in ms.
`formatted`	`string`		Formatted timestamp value

LineChart.usePrice

const {
  value,
  formatted
} = LineChart.usePrice({
  format,
  precision
})

Arguments

Variable	Type	Default	Description
`format`	`({ value, formatted }) => string`		Custom format function of the price.
`precision`	`number`	`2`	Precision of the price value.

Returns

Variable	Type	Default	Description
`value`	`string`		Price value
`formatted`	`string`		Formatted price value

CandlestickChart.useChart

const {
  currentX,     
  currentY,     
  data,         
  domain,       
  step      
} = CandlestickChart.useChart();

Reference

Returns

Variable	Type	Description
`currentX`	`Animated.SharedValue<number>`	Current x position
`currentY`	`Animated.SharedValue<number>`	Current y position
`data`	`Array<{ timestamp: number, open: number, high: number, low: number, close: number }>`	Data of the chart
`domain`	`[number, number]`	Y domain of the chart
`step`	`number`	Current index of the data

CandlestickChart.useCandleData

The useCandleData hook returns the current candle data.

const {
  timestamp,
  open,
  high,
  low,
  close    
} = CandlestickChart.useCandleData();

Reference

Returns

Variable	Type	Default	Description
`timestamp`	`number`
`open`	`number`
`high`	`number`
`low`	`number`
`close`	`number`

CandlestickChart.useDatetime

const {
  value,
  formatted
} = CandlestickChart.useDatetime({
  format,
  locale,
  options
})

Reference

Arguments

Variable	Type	Default	Description
`format`	`({ value, formatted }) => string`		Custom format function of the timestamp.
`locale`	`string`	`"en-US"`	Locale of the timestamp.
`options`	`{}`		Options to pass to `toLocaleString()`. Available options are here

Returns

Variable	Type	Default	Description
`value`	`string`		Timestamp value in ms.
`formatted`	`string`		Formatted timestamp value

CandlestickChart.usePrice

const {
  value,
  formatted
} = CandlestickChart.usePrice({
  format,
  precision
})

Arguments

Variable	Type	Default	Description
`format`	`({ value, formatted }) => string`		Custom format function of the price.
`precision`	`number`	`2`	Precision of the price value.

Returns

Variable	Type	Default	Description
`value`	`string`		Price value
`formatted`	`string`		Formatted price value

GitHub

https://github.com/coinjar/react-native-wagmi-charts