チャート:複数の軸

ほとんどのチャートにはX軸とY軸の2つの軸があります。これは、チャート上のすべてのデータが同じ性質を持ち、同じスケールを共有できる限り、うまく機能します。

しかし、いくつかのチャートには、さまざまな種類のデータを表示する系列があり、単位やスケールが異なります。以下の図は、金額(売上と費用)を表す2つの系列と、数量(DL数)を表す1つの系列です。

1つのY軸に対してすべての系列をプロットすると、最初の2つの系列がグラフの最下部に向かって押し込められてしまいます。

この問題を解決して単一のチャートを使用する最も簡単な方法は、2つ目のY軸を作成し、それを「DL数」系列の axisYプロパティに割り当てることです。

import 'bootstrap.css'; import '@grapecity/wijmo.styles/wijmo.css'; import './styles.css'; import { isArray } from '@grapecity/wijmo'; import { FlexChart, Axis, Position, Palettes } from '@grapecity/wijmo.chart'; import { getData } from './data'; // document.readyState === 'complete' ? init() : window.onload = init; // function init() { // create the chart let theChart = new FlexChart('#theChart', { itemsSource: getData(), bindingX: 'country', series: [ { binding: 'sales', name: '売上' }, { binding: 'expenses', name: '費用' }, { binding: 'downloads', name: 'DL数', chartType: 'LineSymbols' } ], axisY: { format: 'n0,', title: '売上/費用(千ドル)', axisLine: true }, }); theChart.palette = getRandomPalette(); // // create and apply extra Y axis for 'Downloads' series let axisY2 = new Axis(); axisY2.position = Position.Right; axisY2.title = 'DL数(千)'; axisY2.format = 'n0,'; axisY2.min = 0; axisY2.axisLine = true; getSeries('downloads').axisY = axisY2; // // toggle extra axis document.querySelector('#secondaryAxis').addEventListener('click', e => { getSeries('downloads').axisY = e.target.checked ? axisY2 : null; }); // // get a series by its binding function getSeries(binding) { let s = theChart.series; // for (let i = 0; i < s.length; i++) { if (s[i].binding == binding) { return s[i]; } } // return null; } } // function getRandomPalette() { let palettes = Object.getOwnPropertyNames(Palettes).filter(prop => isArray(Palettes[prop])); let rand = Math.floor(Math.random() * palettes.length); // return Palettes[palettes[rand]]; }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>GrapeCity Wijmo FlexChart Multiple Axes</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- SystemJS --> <script src="node_modules/systemjs/dist/system.src.js"></script> <script src="systemjs.config.js"></script> <script> System.import('./src/app'); </script> </head> <body> <div class="container-fluid"> <label for="secondaryAxis">2つ目のY軸</label> <input id="secondaryAxis" type="checkbox" checked="checked"> <div id="theChart"></div> </div> </body> </html>
// create some random data export function getData() { let countries = 'アメリカ,カナダ,メキシコ,ドイツ,イギリス,フランス,イタリア,日本,韓国,中国'.split(','), data = []; // for (let i = 0; i < countries.length; i++) { data.push({ country: countries[i], sales: 1000 + Math.random() * 10000, expenses: 1000 + Math.random() * 5000, downloads: Math.round(Math.random() * 100000) }); } // return data; }
.wj-flexchart { height: 300px; } .wj-control { margin-bottom: 6px; } body { margin-bottom: 24pt; }
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