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
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Backend API
<dx-chart id="chart" [dataSource]="medalsInfo" title="France Olympic Medals">
<dxi-series valueField="gold" name="Gold Medals" color="#ffd700"></dxi-series>
<dxi-series
valueField="silver"
name="Silver Medals"
color="#c0c0c0"
></dxi-series>
<dxo-common-series-settings argumentField="year" type="steparea">
<dxo-steparea>
<dxo-point [visible]="true"></dxo-point>
</dxo-steparea>
</dxo-common-series-settings>
<dxo-argument-axis>
<dxo-label>
<dxo-format type="decimal"></dxo-format>
</dxo-label>
</dxo-argument-axis>
<dxo-legend verticalAlignment="bottom" horizontalAlignment="center">
</dxo-legend>
<dxo-export [enabled]="true"></dxo-export>
</dx-chart>
import { NgModule, Component, enableProdMode } from '@angular/core';
import { BrowserModule, BrowserTransferStateModule } from '@angular/platform-browser';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { DxChartModule } from 'devextreme-angular';
import { Service, MedalsInfo } from './app.service';
if (!/localhost/.test(document.location.host)) {
enableProdMode();
}
@Component({
selector: 'demo-app',
providers: [Service],
templateUrl: 'app/app.component.html',
styleUrls: ['app/app.component.css'],
})
export class AppComponent {
medalsInfo: MedalsInfo[];
constructor(service: Service) {
this.medalsInfo = service.getMedalsInfo();
}
}
@NgModule({
imports: [
BrowserModule,
BrowserTransferStateModule,
DxChartModule,
],
declarations: [AppComponent],
bootstrap: [AppComponent],
})
export class AppModule { }
platformBrowserDynamic().bootstrapModule(AppModule);
::ng-deep #chart {
height: 440px;
width: 100%;
}
import { Injectable } from '@angular/core';
export class MedalsInfo {
year: number;
gold: number;
silver: number;
}
const medalsInfo: 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,
}];
@Injectable()
export class Service {
getMedalsInfo(): MedalsInfo[] {
return medalsInfo;
}
}
// In real applications, you should not transpile code in the browser.
// You can see how to create your own application with Angular and DevExtreme here:
// https://js.devexpress.com/Documentation/Guide/Angular_Components/Getting_Started/Create_a_DevExtreme_Application/
window.exports = window.exports || {};
window.config = {
transpiler: 'ts',
typescriptOptions: {
module: 'system',
emitDecoratorMetadata: true,
experimentalDecorators: true,
},
meta: {
'typescript': {
'exports': 'ts',
},
'devextreme/localization.js': {
'esModule': true,
},
},
paths: {
'npm:': 'https://unpkg.com/',
},
map: {
'ts': 'npm:plugin-typescript@4.2.4/lib/plugin.js',
'typescript': 'npm:typescript@4.2.4/lib/typescript.js',
'@angular/core': 'npm:@angular/core@12.2.17',
'@angular/platform-browser': 'npm:@angular/platform-browser@12.2.17',
'@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@12.2.17',
'@angular/forms': 'npm:@angular/forms@12.2.17',
'@angular/common': 'npm:@angular/common@12.2.17',
'@angular/compiler': 'npm:@angular/compiler@12.2.17',
'tslib': 'npm:tslib@2.3.1/tslib.js',
'rxjs': 'npm:rxjs@7.5.3/dist/bundles/rxjs.umd.js',
'rxjs/operators': 'npm:rxjs@7.5.3/dist/cjs/operators/index.js',
'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js',
'luxon': 'npm:luxon@1.28.1/build/global/luxon.min.js',
'es6-object-assign': 'npm:es6-object-assign@1.1.0',
'devextreme': 'npm:devextreme@23.1.6/cjs',
'devextreme/bundles/dx.all': 'npm:devextreme@23.1.6/bundles/dx.all.js',
'jszip': 'npm:jszip@3.7.1/dist/jszip.min.js',
'devextreme-quill': 'npm:devextreme-quill@1.6.2/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.2.2',
'devexpress-gantt': 'npm:devexpress-gantt@4.1.49',
'devextreme-angular': 'npm:devextreme-angular@23.1.6',
'@devextreme/runtime': 'npm:@devextreme/runtime@3.0.12',
'inferno': 'npm:inferno@7.4.11/dist/inferno.min.js',
'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js',
'inferno-create-element': 'npm:inferno-create-element@7.4.11/dist/inferno-create-element.min.js',
'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js',
'inferno-hydrate': 'npm:inferno-hydrate@7.4.11/dist/inferno-hydrate.min.js',
'inferno-clone-vnode': 'npm:inferno-clone-vnode/dist/inferno-clone-vnode.min.js',
'inferno-create-class': 'npm:inferno-create-class/dist/inferno-create-class.min.js',
'inferno-extras': 'npm:inferno-extras/dist/inferno-extras.min.js',
// Prettier
'prettier/standalone': 'npm:prettier@2.8.4/standalone.js',
'prettier/parser-html': 'npm:prettier@2.8.4/parser-html.js',
},
packages: {
'app': {
main: './app.component.ts',
defaultExtension: 'ts',
},
'devextreme': {
defaultExtension: 'js',
},
'devextreme/events/utils': {
main: 'index',
},
'devextreme/events': {
main: 'index',
},
'es6-object-assign': {
main: './index.js',
defaultExtension: 'js',
},
'rxjs': {
defaultExtension: 'js',
},
'rxjs/operators': {
defaultExtension: 'js',
},
},
packageConfigPaths: [
'npm:@devextreme/*/package.json',
'npm:@devextreme/runtime@3.0.12/inferno/package.json',
'npm:@angular/*/package.json',
'npm:@angular/common@12.2.17/*/package.json',
'npm:rxjs@7.5.3/package.json',
'npm:rxjs@7.5.3/operators/package.json',
'npm:devextreme-angular@23.1.6/*/package.json',
'npm:devextreme-angular@23.1.6/ui/*/package.json',
'npm:devextreme-angular@23.1.6/package.json',
'npm:devexpress-diagram@2.2.2/package.json',
'npm:devexpress-gantt@4.1.49/package.json',
],
};
System.config(window.config);
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<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=1.0" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/23.1.5/css/dx.light.css" />
<script src="https://unpkg.com/core-js@2.6.12/client/shim.min.js"></script>
<script src="https://unpkg.com/zone.js@0.12.0/dist/zone.js"></script>
<script src="https://unpkg.com/reflect-metadata@0.1.13/Reflect.js"></script>
<script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script>
<script src="config.js"></script>
<script>
System.import("app").catch(console.error.bind(console));
</script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<demo-app>Loading...</demo-app>
</div>
</body>
</html>