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SVG Radar Chart in React Native
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| import React, { useMemo } from "react"; | |
| import { View } from "react-native"; | |
| import { degToRadians } from "src/components/OrbitLogo"; | |
| import Svg, { Circle, Line, Polygon } from "react-native-svg"; | |
| import times from "lodash.times"; | |
| type RadarData = { | |
| value: number; | |
| label: string; | |
| }; | |
| type Props = { | |
| radarData: RadarData[]; | |
| size: number; | |
| }; | |
| type Point = [number, number]; | |
| const svgY = (degrees: number) => degrees + 180; | |
| const calculateEdgePointFn = (center: number, radius: number) => ( | |
| degree: number, | |
| scale: number = 1 | |
| ): Point => { | |
| const degreeInRadians = degToRadians(degree); | |
| const degreeInRadiansY = degToRadians(svgY(degree)); | |
| return [ | |
| center + Math.cos(degreeInRadians) * radius * scale, | |
| center + Math.sin(degreeInRadiansY) * radius * scale | |
| ]; | |
| }; | |
| export default (props: Props) => { | |
| const viewBoxSize = props.size || 120; | |
| const viewBoxCenter = viewBoxSize * 0.5; | |
| const radius = viewBoxSize * 0.4; | |
| const calculateEdgePoint = useMemo(() => calculateEdgePointFn(viewBoxCenter, radius), [radius]); | |
| return ( | |
| <View | |
| style={{ | |
| flex: 1, | |
| justifyContent: "center", | |
| alignItems: "center" | |
| }} | |
| > | |
| <Svg height="100%" width="100%" viewBox={`0 0 ${viewBoxSize} ${viewBoxSize}`}> | |
| <Circle | |
| cx={viewBoxCenter} | |
| cy={viewBoxCenter} | |
| r={radius} | |
| stroke="black" | |
| strokeOpacity="0.2" | |
| strokeWidth="0.5" | |
| fill="#F0F0F0" | |
| /> | |
| {times(3).map(i => ( | |
| <Circle | |
| key={`circle_outline_${i}`} | |
| cx={viewBoxCenter} | |
| cy={viewBoxCenter} | |
| r={(i + 1) * radius * 0.25} | |
| stroke="black" | |
| strokeOpacity="0.2" | |
| strokeWidth="0.5" | |
| fill="transparent" | |
| /> | |
| ))} | |
| {times(3).map(i => ( | |
| <Line | |
| key={`crosshair_${i}`} | |
| x1={calculateEdgePoint(i * 60)[0]} | |
| y1={calculateEdgePoint(i * 60)[1]} | |
| x2={calculateEdgePoint(i * 60 + 180)[0]} | |
| y2={calculateEdgePoint(i * 60 + 180)[1]} | |
| stroke="black" | |
| strokeOpacity="0.2" | |
| strokeWidth="0.5" | |
| fill="transparent" | |
| /> | |
| ))} | |
| <Polygon | |
| stroke={"#50E2C2"} | |
| strokeWidth={1.2} | |
| fill={"#50E2C2"} | |
| fillOpacity={0.9} | |
| points={`${props.radarData.map((r, i) => { | |
| const edgePoint = calculateEdgePoint(i * 60, r.value / 100); | |
| return `${edgePoint[0]},${edgePoint[1]}`; | |
| })}`} | |
| /> | |
| </Svg> | |
| </View> | |
| ); | |
| }; |
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