ScatterGL (React)

The sample shows a scatter chart with large data which uses high performance WebGL rendering.

This example uses React.

import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import ReactDOM from 'react-dom/client'; import React, { useEffect, useRef, useState } from 'react'; import useEvent from 'react-use-event-hook'; import { isIE } from '@mescius/wijmo'; import * as wjChart from '@mescius/wijmo.chart'; import { WebGLRenderEngine } from '@mescius/wijmo.chart.webgl'; import { Menu, MenuItem } from '@mescius/wijmo.react.input'; import { FlexChart, FlexChartAxis, FlexChartSeries } from '@mescius/wijmo.react.chart'; import { FlexChartGestures } from '@mescius/wijmo.react.chart.interaction'; import './app.css'; import { getData } from './data'; function App() { const [numberOfPoints, setNumberOfPoints] = useState(isIE() ? 10000 : 100000); const [numberOfSeries, setNumberOfSeries] = useState(1); const [seriesSymbol, setSeriesSymbol] = useState('Dot'); const [symbolSize, setSymbolSize] = useState(3); const [useWebGL, setUseWebGL] = useState(true); const [data, setData] = useState([]); const gesturesRef = useRef(null); const webglEngRef = useRef(new WebGLRenderEngine()); const svgEngRef = useRef(new wjChart.SvgRenderEngine()); const renderEngine = () => { return useWebGL ? webglEngRef.current : svgEngRef.current; }; const gesturesInitialized = useEvent((s) => { gesturesRef.current = s; }); const numPointsChanged = useEvent((s) => { setNumberOfPoints(s.selectedValue); }); const numSeriesChanged = useEvent((s) => { setNumberOfSeries(s.selectedValue); }); const symbolChanged = useEvent((s) => { setSeriesSymbol(s.selectedValue); }); const sizeChanged = useEvent((s) => { setSymbolSize(s.selectedValue); }); const engineChanged = useEvent((e) => { setUseWebGL(e.target.checked); }); const resetZoom = useEvent(() => { var _a; (_a = gesturesRef.current) === null || _a === void 0 ? void 0 : _a.reset(); }); const refreshData = () => { const data = []; for (let i = 0; i < numberOfSeries; i++) { data.push(getData(Math.random() - 0.5, Math.random() - 0.5, numberOfPoints / numberOfSeries, 0.5 * (1 - i / numberOfSeries))); } setData(data); }; useEffect(() => { refreshData(); }, [numberOfSeries, numberOfPoints]); return (<div className="container-fluid"> <div className="row"> <div className="col-sm-12"> <Menu header="NumPoints" value={numberOfPoints} itemClicked={numPointsChanged}> <MenuItem value={1000}>1K</MenuItem> <MenuItem value={10000}>10K</MenuItem> <MenuItem value={100000}>100K</MenuItem> {!isIE() && <MenuItem value={200000}>200K</MenuItem>} {!isIE() && <MenuItem value={500000}>500K</MenuItem>} </Menu> <Menu header="NumSeries" value={numberOfSeries} itemClicked={numSeriesChanged}> <MenuItem value={1}>1</MenuItem> <MenuItem value={2}>2</MenuItem> <MenuItem value={4}>4</MenuItem> <MenuItem value={8}>8</MenuItem> </Menu> <Menu header="Symbol" value={seriesSymbol} itemClicked={symbolChanged}> <MenuItem value="Dot">Dot</MenuItem> <MenuItem value="Box">Box</MenuItem> </Menu> <Menu header="Size" value={symbolSize} itemClicked={sizeChanged}> <MenuItem value={3}>3</MenuItem> <MenuItem value={5}>5</MenuItem> <MenuItem value={10}>10</MenuItem> <MenuItem value={20}>20</MenuItem> <MenuItem value={50}>50</MenuItem> </Menu> <label> Use WebGL <input id="webgl" type="checkbox" checked={useWebGL} onChange={engineChanged}/> </label> </div> </div> <div className="row"> <div className="col-sm-12"> <FlexChart renderEngine={renderEngine()} chartType="Scatter" bindingX="x" binding="y" symbolSize={symbolSize}> <FlexChartAxis wjProperty="axisX" min={-2} max={2}/> <FlexChartAxis wjProperty="axisY" min={-2} max={2} axisLine majorGrid={false}/> <FlexChartGestures interactiveAxes="XY" mouseAction="Zoom" initialized={gesturesInitialized} scaleY={1} posY={0.5} scaleX={1} posX={0.5}/> {data.map((series, i) => { return (<FlexChartSeries key={i} itemsSource={series} name={`ser ${i + 1}`} symbolStyle={{ strokeWidth: 0 }} symbolMarker={seriesSymbol}/>); })} </FlexChart> </div> </div> <div className="row"> <div className="col-sm-12"> <button id="btnNew" onClick={refreshData}>Refresh Data</button> <button id="btnReset" onClick={resetZoom}>Reset Zoom</button> </div> </div> </div>); } const container = document.getElementById('app'); if (container) { const root = ReactDOM.createRoot(container); root.render(<App />); }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>WebGL</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- SystemJS --> <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.40/system.src.js" integrity="sha512-G6mEj6h18+m3MvzdviSDfPle/TfH0//cXcB33AKlNR/Rha0yQsKefDZKRTkIZos97HEGq2JMV1RT5ybMoQ3WsQ==" crossorigin="anonymous"></script> <script src="systemjs.config.js"></script> <script> System.import('./src/app'); </script> </head> <body> <div id="app"></div> </body> </html>
.wj-flexchart { width: 600px; height: 500px; margin: 0; }
export function getData(cx, cy, n, maxr) { let data = new Array(n); let r0 = 0.1 + maxr; for (let i = 0; i < data.length; i++) { let a = 2 * Math.PI * Math.random(); let r = r0 * Math.sqrt(-2 * Math.log(Math.random())); data[i] = { x: cx + r * Math.cos(a), y: cy + r * Math.sin(a) }; } return data; }
(function (global) { System.config({ transpiler: 'plugin-babel', babelOptions: { es2015: true, react: true }, meta: { '*.css': { loader: 'css' } }, paths: { // paths serve as alias 'npm:': 'node_modules/' }, // map tells the System loader where to look for things map: { 'jszip': 'npm:jszip/dist/jszip.js', '@mescius/wijmo': 'npm:@mescius/wijmo/index.js', '@mescius/wijmo.input': 'npm:@mescius/wijmo.input/index.js', '@mescius/wijmo.styles': 'npm:@mescius/wijmo.styles', '@mescius/wijmo.cultures': 'npm:@mescius/wijmo.cultures', '@mescius/wijmo.chart': 'npm:@mescius/wijmo.chart/index.js', '@mescius/wijmo.chart.analytics': 'npm:@mescius/wijmo.chart.analytics/index.js', '@mescius/wijmo.chart.animation': 'npm:@mescius/wijmo.chart.animation/index.js', '@mescius/wijmo.chart.annotation': 'npm:@mescius/wijmo.chart.annotation/index.js', '@mescius/wijmo.chart.finance': 'npm:@mescius/wijmo.chart.finance/index.js', '@mescius/wijmo.chart.finance.analytics': 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'systemjs-babel-build':'npm:systemjs-plugin-babel/systemjs-babel-browser.js', "react-use-event-hook": "npm:react-use-event-hook/dist/esm/useEvent.js", }, // packages tells the System loader how to load when no filename and/or no extension packages: { src: { defaultExtension: 'jsx' }, "node_modules": { defaultExtension: 'js' }, } }); })(this);