추세선

TrendLine 클래스는 일반 Series 클래스를 확장하여 선택된 데이터 및 매개 변수를 기준으로 계산된 계열을 제공합니다.

차트에 추세선을 추가하려면 다음 단계를 수행합니다.

  1. TrendLine 개체를 하나 이상 만듭니다.
  2. binding, chartType, style 등의 속성을 설정하여 일반 계열과 동일한 방식으로 TrendLine 객체를 구성합니다.
  3. TrendLine의 fitTypeorder 속성을 설정하여 만들려는 추세선의 유형을 결정합니다.
import 'bootstrap.css'; import '@grapecity/wijmo.styles/wijmo.css'; import './styles.css'; import * as wjChart from '@grapecity/wijmo.chart'; import * as wjChartAnalytics from '@grapecity/wijmo.chart.analytics'; import * as wjInput from '@grapecity/wijmo.input'; import { getData } from './data'; // document.readyState === 'complete' ? init() : window.onload = init; // function init() { // create the chart let theChart = new wjChart.FlexChart('#theChart', { itemsSource: getData(), chartType: 'Scatter', axisY: { axisLine: true }, bindingX: 'x', series: [ { name: 'Raw Data', binding: 'y' } ] }); // // show the equation on the chart let equation = document.getElementById('equation'); // // create a TrendLine and add it to the Chart series collection let trendLine = new wjChartAnalytics.TrendLine(); trendLine.binding = 'y'; trendLine.style = { stroke: 'darkred', strokeWidth: 3 }; trendLine.visibility = wjChart.SeriesVisibility.Hidden; theChart.series.push(trendLine); // // select trendline order let order = new wjInput.InputNumber('#order', { value: trendLine.order, step: 1, min: 1, max: 6, valueChanged: (s) => { if (s.value >= s.min && s.value <= s.max) { trendLine.order = s.value; showEquation(); } } }); // // select fit type let fitType = new wjInput.ComboBox('#fitType', { isRequired: false, placeholder: 'None', textChanged: (s) => { trendLine.name = s.text; if (s.text) { // show trendline trendLine.fitType = s.text; trendLine.visibility = wjChart.SeriesVisibility.Visible; } else { // hide trendline trendLine.visibility = wjChart.SeriesVisibility.Hidden; } switch (s.text) { // enable/disable order input case 'Polynomial': case 'Fourier': order.isDisabled = false; break; default: order.isDisabled = true; break; } showEquation(); }, itemsSource: 'Linear,Exponential,Logarithmic,Power,Fourier,Polynomial,MinX,MinY,MaxX,MaxY,AverageX,AverageY'.split(',') }); // // show updated equation on a timeOut since the TrendLine update is async function showEquation() { equation.innerHTML = ''; setTimeout(() => equation.innerHTML = trendLine.getEquation(), 100); } // // randomize the data document.querySelector('#btnRandomize').addEventListener('click', () => { theChart.itemsSource = getData(); showEquation(); }); }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>GrapeCity Wijmo FlexChart Trendlines</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="fitType">Trendline Type: </label> <div id="fitType"></div><br /> <label for="order">Order: </label> <div id="order"></div><br /> <label>Equation: </label> <div id="equation" class="equation"></div><br /> <label for="btnRandomize">Randomize Data</label> <button id="btnRandomize" class="btn btn-default"> Go </button> <div id="theChart"></div> </div> </body> </html>
// data sources export function getData() { let arr = [], cnt = 50, a = Math.random(), b = Math.random(); // for (let i = 1; i < cnt; i++) { arr.push({ x: i, y: a + i * b + i * Math.random() }); } // return arr; }
.wj-flexchart { height: 250px; margin: 10px 0; } .wj-control { margin-bottom: 3px; } label { width: 120px; text-align: right; } .equation { display: inline-block; font-style: italic; font-size: 80%; } .wj-combobox, .wj-inputnumber { width: 120px; margin-right: 12px; } body { margin-bottom: 24pt; }
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