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React Native - StackedBarChart
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// Usage of the StackedBarChart.jsx | |
// @flow | |
import React, { Component } from 'react'; | |
import { | |
View, | |
StyleSheet | |
} from 'react-native'; | |
import { StackedBarChart, TRAText, TRATextStrong } from 'app/components'; | |
import styleVars from 'app/style/variables'; | |
import Icon from 'react-native-vector-icons/FontAwesome'; | |
type Props = { | |
barGroups: { | |
key: string, | |
values: { | |
amount: number, | |
category: string, | |
}, | |
}, | |
categoryColors: { | |
[string]: string | |
}, | |
} | |
type State = { | |
chartWidth: number, | |
}; | |
class SalesStackedBarChart extends Component<Props, State> { | |
constructor(props: Props) { | |
super(props); | |
this.state = { | |
chartWidth: 375 | |
} | |
} | |
_onLayout = ({nativeEvent}) => { | |
this.setState({ | |
chartWidth: nativeEvent.layout.width // allows svg chart to grow based on container element | |
}); | |
} | |
render() { | |
const { barGroups, categoryColors } = this.props; | |
const { chartWidth } = this.state; | |
return ( | |
<View style={styles.container} onLayout={this._onLayout}> | |
<TRAText style={styles.timeSelector}>2016 <Icon name='angle-down' /></TRAText> | |
<StackedBarChart | |
barGroups={barGroups} | |
categoryColors={categoryColors} | |
chartWidth={chartWidth} | |
/> | |
<View style={styles.summaryHolder}> | |
{this._renderCategorySummary('$456k', 'SOLD', categoryColors)} | |
{this._renderCategorySummary('$89k', 'CONTRACT', categoryColors)} | |
{this._renderCategorySummary('$30k', 'APPROACH', categoryColors)} | |
</View> | |
</View> | |
) | |
} | |
_renderCategorySummary(amountText, category, categoryColors) { | |
return ( | |
<View style={styles.categorySummary}> | |
<TRAText style={styles.categoryTotal}>{amountText}</TRAText> | |
<TRATextStrong style={[ | |
styles.categoryText, | |
{color: categoryColors[category]} | |
]} | |
> | |
{category} | |
</TRATextStrong> | |
</View> | |
) | |
} | |
} | |
const styles = StyleSheet.create({ | |
container: { | |
margin: styleVars.padding.edgeOfScreen | |
}, | |
timeSelector: { | |
color: styleVars.color.five, | |
fontSize: styleVars.fontSize.small | |
}, | |
summaryHolder: { | |
marginTop: 10, | |
flexDirection: 'row' | |
}, | |
categorySummary: { | |
flex: 1 | |
}, | |
categoryTotal: { | |
fontSize: styleVars.fontSize.xlarge, | |
textAlign: 'center' | |
}, | |
categoryText: { | |
fontSize: styleVars.fontSize.medium, | |
textAlign: 'center' | |
} | |
}); | |
export default SalesStackedBarChart; |
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// @flow | |
import React from 'react'; | |
import { | |
StyleSheet | |
} from 'react-native'; | |
import Svg, { | |
Rect, | |
G, | |
Text | |
} from 'react-native-svg'; | |
type Props = { | |
barGroups: { | |
key: string, | |
values: { | |
amount: number, | |
category: string, | |
}[], | |
}[], | |
categoryColors: { | |
[string]: string | |
}, | |
chartHeight?: number, | |
chartWidth?: number, | |
keyTextColor?: string, | |
}; | |
const StackedBarChart = ({barGroups, categoryColors, chartHeight = 300, chartWidth = 375}: Props) => { | |
const barAreaHeight = chartHeight - 20, // room for key text below bars | |
barAreaSectionWidth = chartWidth / barGroups.length, | |
barWidth = barAreaSectionWidth * .8, // bars take up 80% of space | |
barXPadding = barAreaSectionWidth * .2, // padding takes up 20% of space (between bars) | |
maxBarGroupValue = _calculateMaxBarGroupValue(barGroups); | |
let nextX = barXPadding / 2; // first item offset | |
return ( | |
<Svg height={chartHeight} width={chartWidth}> | |
{ | |
barGroups.map((barGroup) => { | |
const x = nextX; | |
nextX = x + barWidth + barXPadding; | |
return ( | |
_renderBarGroup(barGroup, x, barAreaHeight, barWidth, maxBarGroupValue, categoryColors) | |
) | |
}) | |
} | |
</Svg> | |
); | |
} | |
function _calculateMaxBarGroupValue(barGroups) { | |
let maxBarGroupValue = 0; | |
barGroups.forEach((barGroup) => { | |
let valueSum = barGroup.values.reduce((accumulator, {amount}) => { | |
return accumulator + amount; | |
}, 0); | |
maxBarGroupValue = valueSum > maxBarGroupValue ? | |
valueSum : | |
maxBarGroupValue; | |
}); | |
return maxBarGroupValue; | |
} | |
function _renderBarGroup( {key, values}, x, areaHeight, barWidth, maxBarGroupValue, categoryColors) { | |
let nextY = areaHeight; //start at bottom | |
return ( | |
<G key={x} width={150}> | |
{ | |
values.map( ({amount, category}, idx) => { | |
const fractionOfMax = amount / maxBarGroupValue; | |
const height = areaHeight * fractionOfMax; | |
const y = nextY; | |
nextY = y - height; // work way up from bottom | |
// console.log(`y: ${y} height: ${height}`); | |
return ( | |
<G key={idx}> | |
<Rect key={idx} | |
fill={categoryColors[category]} x={x} y={y} | |
width={barWidth} height={-height}> | |
</Rect> | |
</G> | |
); | |
} | |
) | |
} | |
<Text | |
fill={'#999'} | |
stroke='none' | |
fontSize='12' | |
x={x + barWidth/2} | |
y={areaHeight + 3} | |
textAnchor='middle' | |
> | |
{key} | |
</Text> | |
</G> | |
); | |
} | |
const styles = StyleSheet.create({ | |
}); | |
export default StackedBarChart; |
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