├── .nvmrc ├── src ├── index.ts ├── UPlot │ ├── index.ts │ ├── UPlot.tsx │ └── index.html └── ChartJs │ ├── index.ts │ ├── ChartJs.tsx │ └── index.html ├── .gitignore ├── img └── react-native-canvas-charts.png ├── .prettierrc.js ├── babel.config.js ├── tsconfig.json ├── .github └── workflows │ └── ci.yml ├── package.json ├── .eslintrc.js ├── README.md └── LICENSE /.nvmrc: -------------------------------------------------------------------------------- 1 | 14.14.0 2 | -------------------------------------------------------------------------------- /src/index.ts: -------------------------------------------------------------------------------- 1 | export {}; 2 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | .DS_Store 2 | node_modules/ 3 | dist/ 4 | -------------------------------------------------------------------------------- /src/UPlot/index.ts: -------------------------------------------------------------------------------- 1 | import { SetData, UPlot } from "./UPlot"; 2 | 3 | export { UPlot }; 4 | 5 | export type { SetData }; 6 | -------------------------------------------------------------------------------- /img/react-native-canvas-charts.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/dpwiese/react-native-canvas-charts/HEAD/img/react-native-canvas-charts.png -------------------------------------------------------------------------------- /src/ChartJs/index.ts: -------------------------------------------------------------------------------- 1 | import { ChartJs, DataPoint, SetData } from "./ChartJs"; 2 | 3 | export { ChartJs as Chart }; 4 | 5 | export type { DataPoint, SetData }; 6 | -------------------------------------------------------------------------------- /.prettierrc.js: -------------------------------------------------------------------------------- 1 | module.exports = { 2 | useTabs: false, 3 | tabWidth: 2, 4 | bracketSpacing: true, 5 | jsxBracketSameLine: false, 6 | singleQuote: false, 7 | trailingComma: "all", 8 | printWidth: 120, 9 | trailingComma: "es5", 10 | semi: true, 11 | endOfLine: "lf", 12 | }; 13 | 14 | -------------------------------------------------------------------------------- /babel.config.js: -------------------------------------------------------------------------------- 1 | module.exports = { 2 | plugins: [ 3 | "@babel/plugin-transform-react-jsx-source", 4 | "@babel/plugin-transform-react-jsx", 5 | ], 6 | presets: [ 7 | "@babel/preset-typescript", 8 | "@babel/preset-env" 9 | ], 10 | comments: false, 11 | compact: true, 12 | }; 13 | -------------------------------------------------------------------------------- /tsconfig.json: -------------------------------------------------------------------------------- 1 | { 2 | "compilerOptions": { 3 | "allowJs": true, 4 | "allowSyntheticDefaultImports": true, 5 | "declaration": true, 6 | "esModuleInterop": true, 7 | "isolatedModules": true, 8 | "jsx": "react", 9 | "lib": ["es6"], 10 | "moduleResolution": "node", 11 | "outDir": "./dist", 12 | "strict": true, 13 | "target": "esnext" 14 | }, 15 | "exclude": [ 16 | "babel.config.js", 17 | "jest.config.js", 18 | "node_modules" 19 | ], 20 | "include": ["src/**/*"], 21 | } 22 | -------------------------------------------------------------------------------- /.github/workflows/ci.yml: -------------------------------------------------------------------------------- 1 | name: node-ci 2 | 3 | on: [push] 4 | 5 | jobs: 6 | lint: 7 | name: Typecheck and lint 8 | 9 | runs-on: ubuntu-latest 10 | 11 | steps: 12 | - name: Checkout code 13 | uses: actions/checkout@v2 14 | 15 | - name: Use Node.js 16 | uses: actions/setup-node@v1 17 | with: 18 | node-version: '14.x' 19 | 20 | - name: Install dependencies 21 | run: npm install 22 | 23 | - name: Typecheck 24 | run: tsc --noEmit 25 | 26 | - name: Lint 27 | run: npm run lint 28 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "@dpwiese/react-native-canvas-charts", 3 | "version": "0.0.4", 4 | "description": "WebView wrapper for using canvas based charts in React Native", 5 | "author": "Daniel Wiese (https://danielwiese.com)", 6 | "license": "MIT", 7 | "main": "dist/index", 8 | "types": "dist/index", 9 | "repository": { 10 | "type": "git", 11 | "url": "git+https://github.com/dpwiese/react-native-canvas-charts.git" 12 | }, 13 | "scripts": { 14 | "build": "rm -rf dist && babel src --out-dir dist --extensions '.ts,.tsx' --copy-files && tsc --project tsconfig.json --emitDeclarationOnly && cp -rf package.json dist && cp -rf README.md dist", 15 | "pack": "cd dist && npm pack && cd ..", 16 | "lint": "eslint src --ext .ts,.tsx --fix", 17 | "tc": "tsc --project tsconfig.json --noEmit", 18 | "publish": "cd dist && npm publish --ignore-scripts && cd ..", 19 | "prepublishOnly": "echo \"Error: Don't run 'npm publish' in root. Use 'npm run publish' instead.\" && exit 1" 20 | }, 21 | "dependencies": { 22 | "react-native-webview": "^11.2.1" 23 | }, 24 | "devDependencies": { 25 | "@babel/cli": "^7.12.10", 26 | "@babel/core": "^7.12.10", 27 | "@babel/plugin-transform-react-jsx": "^7.12.12", 28 | "@babel/plugin-transform-react-jsx-source": "^7.12.1", 29 | "@babel/preset-env": "^7.12.11", 30 | "@babel/preset-typescript": "^7.12.7", 31 | "@react-native-community/eslint-config": "^2.0.0", 32 | "@types/node": "^14.14.22", 33 | "@types/react": "^17.0.0", 34 | "@types/react-native": "^0.63.46", 35 | "eslint": "^7.19.0", 36 | "typescript": "^4.1.3" 37 | } 38 | } 39 | -------------------------------------------------------------------------------- /.eslintrc.js: -------------------------------------------------------------------------------- 1 | module.exports = { 2 | root: true, 3 | extends: "@react-native-community", 4 | rules: { 5 | "semi": "error", 6 | "no-console": "off", 7 | "no-unused-vars": ["error", { "argsIgnorePattern": "^_", "varsIgnorePattern": "^_" }], 8 | "quotes": ["error", "double", { "avoidEscape": true, "allowTemplateLiterals": true}], 9 | "react-hooks/exhaustive-deps": "off", 10 | "object-curly-spacing": ["error", "always"], 11 | "react/jsx-filename-extension": ["error", { "extensions": [".js", ".jsx", ".ts", ".tsx"] }], 12 | "linebreak-style": "off", 13 | "prettier/prettier": [ 14 | "error", 15 | { 16 | "endOfLine": "auto" 17 | }, 18 | { "usePrettierrc": true } 19 | ], 20 | "react/display-name": "off", 21 | "sort-imports": [ 22 | "warn", 23 | { 24 | "ignoreCase": false, 25 | "ignoreDeclarationSort": false, 26 | "ignoreMemberSort": false, 27 | "memberSyntaxSortOrder": ["none", "all", "multiple", "single"] 28 | } 29 | ] 30 | }, 31 | overrides: [ 32 | { 33 | "files": ["**/*.ts", "**/*.tsx"], 34 | "extends": [ 35 | "plugin:@typescript-eslint/eslint-recommended", 36 | "plugin:@typescript-eslint/recommended", 37 | "prettier/@typescript-eslint" 38 | ], 39 | "parser": "@typescript-eslint/parser", 40 | "parserOptions": { 41 | "project": "./tsconfig.json" 42 | }, 43 | "plugins": ["@typescript-eslint"], 44 | "rules": { 45 | "@typescript-eslint/no-unused-vars": ["error", { "argsIgnorePattern": "^_", "varsIgnorePattern": "^_" }] 46 | }, 47 | "settings": { 48 | "react": { 49 | "version": "detect" 50 | }, 51 | "import/parsers": { 52 | "@typescript-eslint/parser": [".ts", ".tsx"] 53 | }, 54 | "import/resolver": { 55 | "typescript": {} 56 | } 57 | } 58 | } 59 | ] 60 | }; 61 | -------------------------------------------------------------------------------- /src/UPlot/UPlot.tsx: -------------------------------------------------------------------------------- 1 | import React, { ReactElement, forwardRef, useImperativeHandle } from "react"; 2 | import { StyleProp, StyleSheet, View, ViewStyle, useWindowDimensions } from "react-native"; 3 | import { WebView } from "react-native-webview"; 4 | 5 | // eslint-disable-next-line @typescript-eslint/no-var-requires 6 | const htmlTemplate = require("./index.html"); 7 | 8 | const styles = StyleSheet.create({ 9 | container: { 10 | overflow: "hidden", 11 | }, 12 | webview: { 13 | height: "100%", 14 | width: "100%", 15 | }, 16 | }); 17 | 18 | export type SetData = { 19 | setData: (data: number[][]) => void; 20 | }; 21 | 22 | type ChartStyle = StyleProp & { height: number }; 23 | 24 | type Props = { 25 | opts: any; // eslint-disable-line @typescript-eslint/no-explicit-any 26 | data: number[][]; 27 | style?: ChartStyle; 28 | }; 29 | 30 | export const UPlot = forwardRef( 31 | (props: Props, ref): ReactElement => { 32 | let webref: WebView<{ originWhitelist: string[]; ref: unknown; source: { html: string } }> | null; 33 | const windowWidth = useWindowDimensions().width; 34 | 35 | // eslint-disable-next-line @typescript-eslint/no-explicit-any 36 | const addChart = (opts: any, data: number[][]): void => { 37 | // Subtracting height of u-title and u-legend and some more? 38 | opts.height = (props.style?.height || 200) - 27 - 58 - 30; 39 | opts.width = windowWidth - 20; 40 | webref?.injectJavaScript( 41 | `let uplot = new uPlot(${JSON.stringify(opts)}, ${JSON.stringify(data)}, document.body);true;` 42 | ); 43 | }; 44 | 45 | const setData = (data: number[][]): void => { 46 | webref?.injectJavaScript(`uplot.setData(${JSON.stringify(data)});true;`); 47 | }; 48 | 49 | useImperativeHandle(ref, () => ({ 50 | setData, 51 | })); 52 | 53 | return ( 54 | // eslint-disable-next-line @typescript-eslint/ban-types 55 | 56 | | null => 59 | (webref = r) 60 | } 61 | source={htmlTemplate} 62 | onLoadEnd={(): void => { 63 | addChart(props.opts, props.data); 64 | }} 65 | style={styles.webview} 66 | /> 67 | 68 | ); 69 | } 70 | ); 71 | -------------------------------------------------------------------------------- /src/ChartJs/ChartJs.tsx: -------------------------------------------------------------------------------- 1 | import React, { ReactElement, forwardRef, useImperativeHandle } from "react"; 2 | import { StyleProp, StyleSheet, View, ViewStyle } from "react-native"; 3 | import { WebView } from "react-native-webview"; 4 | 5 | // eslint-disable-next-line @typescript-eslint/no-var-requires 6 | const htmlTemplate = require("./index.html"); 7 | 8 | const styles = StyleSheet.create({ 9 | container: { 10 | overflow: "hidden", 11 | }, 12 | webview: { 13 | height: "100%", 14 | width: "100%", 15 | }, 16 | }); 17 | 18 | export type DataPoint = { 19 | x: number; 20 | y: number; 21 | }; 22 | 23 | export type SetData = { 24 | setData: (data: DataPoint[][]) => void; 25 | }; 26 | 27 | type Props = { 28 | config: any; // eslint-disable-line @typescript-eslint/no-explicit-any 29 | dataSets?: DataPoint[][]; 30 | style?: StyleProp; 31 | }; 32 | 33 | export const ChartJs = forwardRef( 34 | (props: Props, ref): ReactElement => { 35 | let webref: WebView<{ originWhitelist: string[]; ref: unknown; source: { html: string } }> | null; 36 | 37 | // eslint-disable-next-line @typescript-eslint/no-explicit-any 38 | const addChart = (config: any): void => { 39 | webref?.injectJavaScript(`const canvasEl = document.createElement("canvas"); 40 | canvasEl.height = ${JSON.stringify(styles.webview.height)}; 41 | document.body.appendChild(canvasEl); 42 | window.canvasLine = new Chart(canvasEl.getContext('2d'), ${JSON.stringify(config)});true;`); 43 | }; 44 | 45 | const setData = (dataSets: DataPoint[][]): void => { 46 | if (dataSets) { 47 | dataSets.forEach((_: DataPoint[], i: number) => { 48 | webref?.injectJavaScript(`window.canvasLine.config.data.datasets[${i}].data = ${JSON.stringify(dataSets[i])}; 49 | window.canvasLine.update();true;`); 50 | }); 51 | } 52 | }; 53 | 54 | useImperativeHandle(ref, () => ({ 55 | setData, 56 | })); 57 | 58 | return ( 59 | // eslint-disable-next-line @typescript-eslint/ban-types 60 | 61 | | null => 64 | (webref = r) 65 | } 66 | source={htmlTemplate} 67 | onLoadEnd={(): void => { 68 | addChart(props.config); 69 | }} 70 | style={styles.webview} 71 | /> 72 | 73 | ); 74 | } 75 | ); 76 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # react-native-canvas-charts 2 | 3 | ![node-ci](https://github.com/dpwiese/react-native-canvas-charts/workflows/node-ci/badge.svg) 4 | ![npm (scoped)](https://img.shields.io/npm/v/@dpwiese/react-native-canvas-charts) 5 | 6 | [react-native-canvas-charts](https://github.com/dpwiese/react-native-canvas-charts) provides a simple wrapper around [react-native-webview](https://github.com/react-native-webview/react-native-webview) for making canvas-based charts in React Native. 7 | Read more in the post [Canvas Charts in React Native](https://danielwiese.com/posts/react-native-canvas-charts/). 8 | Currently supports [Chart.js](https://www.chartjs.org) and [uPlot](https://github.com/leeoniya/uPlot). 9 | 10 | ![react-native-canvas-charts](img/react-native-canvas-charts.png "react-native-canvas-charts") 11 | 12 | ## Install 13 | 14 | ```sh 15 | % npm i --save react-native-webview @dpwiese/react-native-canvas-charts 16 | % cd ios && pod install 17 | ``` 18 | 19 | ## Using 20 | 21 | ### Chart.js 22 | 23 | Currently [react-native-canvas-charts](https://github.com/dpwiese/react-native-canvas-charts) only supports [Chart.js](https://www.chartjs.org) version 3. 24 | To use, simply import `Chart`, define the standard Chart.js [Dataset Configuration](https://www.chartjs.org/docs/master/configuration/index#dataset-configuration) and pass it to the `config` prop. 25 | 26 | ```js 27 | import { Chart } from "@dpwiese/react-native-canvas-charts/ChartJs"; 28 | 29 | const chartConfig = { 30 | type: "line", 31 | data: { 32 | datasets: [ 33 | { 34 | label: "My Legend Label", 35 | backgroundColor: "rgb(224, 110, 60)", 36 | borderColor: "rgb(224, 110, 60)", 37 | data: [ 38 | { x: 1, y: 2 }, 39 | { x: 2, y: 5 }, 40 | { x: 3, y: 3 }, 41 | ], 42 | fill: false, 43 | pointRadius: 0, 44 | lineTension: 0.1, 45 | borderJoinStyle: "round", 46 | }, 47 | ], 48 | }, 49 | options: { 50 | animation: { 51 | duration: 0, 52 | }, 53 | responsive: true, 54 | plugins: { 55 | title: { 56 | display: true, 57 | text: "My Title", 58 | }, 59 | tooltip: { 60 | mode: "index", 61 | intersect: false, 62 | }, 63 | }, 64 | hover: { 65 | mode: "nearest", 66 | intersect: true, 67 | }, 68 | scales: { 69 | x: { 70 | type: "linear", 71 | display: true, 72 | scaleLabel: { 73 | display: true, 74 | labelString: "My X-Axis Label", 75 | }, 76 | ticks: { 77 | autoSkipPadding: 100, 78 | autoSkip: true, 79 | minRotation: 0, 80 | maxRotation: 0, 81 | }, 82 | }, 83 | y: { 84 | display: true, 85 | scaleLabel: { 86 | display: true, 87 | labelString: "My Y-Axis Label", 88 | }, 89 | }, 90 | }, 91 | }, 92 | }; 93 | 94 | export default () => ; 95 | ``` 96 | 97 | #### Streaming Data 98 | 99 | To stream data to the chart, the `setData` ref can be used as below 100 | 101 | ```js 102 | import { Chart, SetData } from "@dpwiese/react-native-canvas-charts/ChartJs"; 103 | import { useRef } from "react"; 104 | import { chartConfig } from "./chartConfig"; 105 | 106 | export default () => { 107 | const setDataRef = useRef(); 108 | 109 | // Update the charted data with newData 110 | setDataRef.current.setData(newData); 111 | 112 | return (); 113 | } 114 | ``` 115 | 116 | ### uPlot 117 | 118 | [uPlot](https://github.com/leeoniya/uPlot) is a very performant canvas-based plotting library supported by [react-native-canvas-charts](https://github.com/dpwiese/react-native-canvas-charts). 119 | To use, simply import `UPlot` and pass it [`data`](https://github.com/leeoniya/uPlot/tree/master/docs#data-format) and [`opts`](https://github.com/leeoniya/uPlot/tree/master/docs#basics). 120 | 121 | ```js 122 | import { UPlot } from "@dpwiese/react-native-canvas-charts/UPlot"; 123 | 124 | const opts = { 125 | title: "My Chart", 126 | id: "chart1", 127 | class: "my-chart", 128 | width: 400, 129 | height: 600, 130 | series: [ 131 | {}, 132 | { 133 | show: true, 134 | spanGaps: false, 135 | label: "RAM", 136 | value: (self, rawValue) => "$" + rawValue.toFixed(2), 137 | stroke: "red", 138 | width: 1, 139 | fill: "rgba(255, 0, 0, 0.3)", 140 | dash: [10, 5], 141 | }, 142 | ], 143 | }; 144 | 145 | const data = [ 146 | [0, 100], 147 | [35, 71], 148 | [90, 15], 149 | ]; 150 | 151 | export default () => ; 152 | ``` 153 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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