react-native-scatter-chart

Very simple scatter chart without native dependencies

Installation

npm i --save react-native-scatter-chart

(or)

yarn add react-native-scatter-chart

Usage

Data format:

const chartData = [
    {
        color: 'red',
        unit: '%',
        values: [[0,0],[1,0.5877852522924731],[2,0.9510565162951535],[3,0.9510565162951536],[4,0.5877852522924732],[5,1.2246467991473532e-16],[6,-0.587785252292473],[7,-0.9510565162951535],[8,-0.9510565162951536],[9,-0.5877852522924734],[10,-2.4492935982947064e-16],[11,0.5877852522924729],[12,0.9510565162951535],[13,0.9510565162951536],[14,0.5877852522924734],[15,3.6739403974420594e-16],[16,-0.5877852522924728],[17,-0.9510565162951534],[18,-0.9510565162951538],[19,-0.5877852522924735]]
    },
    {
        color: 'green',
        unit: '%',
        values: [[0,1],[1,0.8090169943749475],[2,0.30901699437494745],[3,-0.30901699437494734],[4,-0.8090169943749473],[5,-1],[6,-0.8090169943749475],[7,-0.30901699437494756],[8,0.30901699437494723],[9,0.8090169943749473],[10,1],[11,0.8090169943749476],[12,0.30901699437494773],[13,-0.3090169943749471],[14,-0.8090169943749472],[15,-1],[16,-0.8090169943749477],[17,-0.30901699437494784],[18,0.309016994374947],[19,0.8090169943749471]]
 
    }
];

Inside render:

<ScatterChart
    backgroundColor='#ffffff'
    data={chartData}
    height={200}
    horizontalLinesAt={[-1, -.5, 0, .5, 1]}
    unitY=''
/>

Why this module?

Wanted to display a simple scatter chart in my React Native app and existing modules depended on multiple modules and always needed native components.

How does it work?

This component draws the chart using only <View /> and <Text /> react native components.

Accepted props

const propTypes = {
    data: PropTypes.arrayOf(
        PropTypes.shape({
            color: PropTypes.string,
            unit: PropTypes.string,
            values: PropTypes.arrayOf(
                PropTypes.arrayOf(
                    PropTypes.number
                )
            )
 
        })
    ), // takes array of series of data (array of arrays of {x, y})
    chartWidth: PropTypes.number, // by default uses entire width of the device
    chartHeight: PropTypes.number, // by default 200 scaled px
    backgroundColor: PropTypes.string, // 'white' by default
    colors: PropTypes.arrayOf(PropTypes.string), // specify the colors for each series of data
    minY: PropTypes.number,
    maxY: PropTypes.number,
    minX: PropTypes.number,
    maxX: PropTypes.number,
    unitX: PropTypes.string,
    unitY: PropTypes.string,
    horizontalLinesAt: PropTypes.arrayOf(PropTypes.number),
    verticalLinesAt: PropTypes.arrayOf(PropTypes.number),
}
const defaultProps = {
    chartHeight: 200,
    chartWidth: Dimensions.get('window').width,
    backgroundColor: 'white',
    unitX: '',
    unitY: ''
}