Vue Charts - Step Area with Gaps

The Step Area series uses perpendicular vertical and horizontal lines to connect data points and shades the area under these lines. If a point's value is null, the series draws a gap.

Only null point values result in gaps. undefined values are ignored. Multiple 0 values may look like a gap, but if series points are visible, you can see them in this gap. If you want to remove gaps caused by null values, enable the ignoreEmptyPoints property.

www.wikipedia.org

Backend API

<template> <DxChart id="chart" :data-source="medalsInfo" title="France Olympic Medals" > <DxSeries value-field="gold" name="Gold Medals" color="#ffd700" /> <DxSeries value-field="silver" name="Silver Medals" color="#c0c0c0" /> <DxCommonSeriesSettings argument-field="year" type="steparea" > <DxPoint :visible="true"/> </DxCommonSeriesSettings> <DxArgumentAxis> <DxLabel format="decimal"/> </DxArgumentAxis> <DxLegend vertical-alignment="bottom" horizontal-alignment="center" /> <DxExport :enabled="true"/> </DxChart> </template> <script setup lang="ts"> import DxChart, { DxArgumentAxis, DxLabel, DxLegend, DxSeries, DxCommonSeriesSettings, DxExport, DxPoint, } from 'devextreme-vue/chart'; import { medalsInfo } from './data.ts'; </script> <style> #chart { height: 440px; width: 100%; } </style>

export const medalsInfo = [{ year: 1904, gold: null, silver: null, }, { year: 1908, gold: 5, silver: 5, }, { year: 1912, gold: 7, silver: 4, }, { year: 1916, gold: null, silver: null, }, { year: 1920, gold: 9, silver: 19, }, { year: 1924, gold: 13, silver: 15, }, { year: 1928, gold: 6, silver: 10, }, { year: 1932, gold: 10, silver: 5, }, { year: 1936, gold: 7, silver: 6, }, { year: 1940, gold: null, silver: null, }, { year: 1944, gold: null, silver: null, }, { year: 1948, gold: 10, silver: 6, }, { year: 1952, gold: 6, silver: 6, }, { year: 1956, gold: 4, silver: 4, }, { year: 1960, gold: null, silver: 2, }, { year: 1964, gold: 1, silver: 8, }, { year: 1968, gold: 7, silver: 3, }, { year: 1972, gold: 2, silver: 4, }, { year: 1976, gold: 2, silver: 3, }, { year: 1980, gold: 6, silver: 5, }, { year: 1984, gold: 5, silver: 7, }, { year: 1988, gold: 6, silver: 4, }, { year: 1992, gold: 8, silver: 5, }, { year: 1996, gold: 15, silver: 7, }, { year: 2000, gold: 13, silver: 14, }, { year: 2004, gold: 11, silver: 9, }, { year: 2008, gold: 7, silver: 16, }, { year: 2012, gold: 11, silver: 11, }, { year: 2016, gold: 18, silver: 18, }];

import { createApp } from 'vue'; import App from './App.vue'; createApp(App).mount('#app');

<!DOCTYPE html> <html lang="en"> <head> <title>DevExtreme Demo</title> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=5.0" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/26.1.5/css/dx.light.css" /> <link rel="stylesheet" type="text/css" href="./bundle.css" /> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="app"> </div> </div> <script src="bundles/vendor/vue.vendor.js"></script> <script src="./bundle.js"></script> </body> </html>