Custom Projection
This demo illustrates how to implement a custom projection. To do it, set the aspectRatio, to, and from properties. The Wagner-VI projection is used in this example.
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<dx-vector-map
id="vector-map"
[projection]="customProjection"
title="Wagner VI projection"
>
<dxo-export [enabled]="true"></dxo-export>
<dxi-layer [dataSource]="worldMap"></dxi-layer>
<dxi-layer
[dataSource]="coordLinesData"
[hoverEnabled]="false"
[borderWidth]="1"
color="#aaa"
></dxi-layer>
</dx-vector-map>
import { NgModule, Component, enableProdMode } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { DxVectorMapModule } from 'devextreme-angular';
import * as mapsData from 'devextreme/dist/js/vectormap-data/world.js';
import { FeatureCollection, Service } from './app.service';
const RADIANS = Math.PI / 180;
const WAGNER_6_P_LAT = Math.PI / Math.sqrt(3);
const WAGNER_6_U_LAT = 2 / Math.sqrt(3) - 0.1;
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 {
worldMap: any = mapsData.world;
customProjection: any;
coordLinesData: FeatureCollection;
constructor(service: Service) {
this.coordLinesData = service.getCoordLinesData();
this.customProjection = {
aspectRatio: 2,
to(coordinates) {
const x = coordinates[0] * RADIANS;
const y = Math.min(Math.max(coordinates[1] * RADIANS, -WAGNER_6_P_LAT), +WAGNER_6_P_LAT);
const t = y / Math.PI;
return [
x / Math.PI * Math.sqrt(1 - 3 * t * t),
y * 2 / Math.PI,
];
},
from(coordinates) {
const x = coordinates[0];
const y = Math.min(Math.max(coordinates[1], -WAGNER_6_U_LAT), +WAGNER_6_U_LAT);
const t = y / 2;
return [
x * Math.PI / Math.sqrt(1 - 3 * t * t) / RADIANS,
y * Math.PI / 2 / RADIANS,
];
},
};
}
}
@NgModule({
imports: [
BrowserModule,
DxVectorMapModule,
],
declarations: [AppComponent],
bootstrap: [AppComponent],
})
export class AppModule { }
platformBrowserDynamic().bootstrapModule(AppModule);
::ng-deep #vector-map {
height: 400px;
}
import { Injectable } from '@angular/core';
export class FeatureCollection {
type: string;
features: Feature[];
}
export class Feature {
geometry: FeatureGeometry;
}
export class FeatureGeometry {
type: string;
coordinates: number[][];
}
const coordLinesData: FeatureCollection = {
type: 'FeatureCollection',
features: [],
};
// add meridians
for (let longitude = -180; longitude <= 180; longitude += 30) {
const lineCoords = [];
for (let latitude = -90; latitude <= 90; latitude += 5) {
lineCoords.push([longitude, latitude]);
}
coordLinesData.features.push({
geometry: {
type: 'LineString',
coordinates: lineCoords,
},
});
}
// add parallels
for (let latitude = -90; latitude <= 90; latitude += 30) {
coordLinesData.features.push({
geometry: {
type: 'LineString',
coordinates: [[-180, latitude], [180, latitude]],
},
});
}
@Injectable()
export class Service {
getCoordLinesData(): FeatureCollection {
return coordLinesData;
}
}
// 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.config = {
transpiler: 'ts',
typescriptOptions: {
module: 'system',
emitDecoratorMetadata: true,
experimentalDecorators: true,
},
meta: {
'typescript': {
'exports': 'ts',
},
'devextreme/dist/js/vectormap-data/*': {
'esModule': true,
},
'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@12.2.16',
'@angular/platform-browser': 'npm:@angular/platform-browser@12.2.16',
'@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@12.2.16',
'@angular/forms': 'npm:@angular/forms@12.2.16',
'@angular/common': 'npm:@angular/common@12.2.16',
'@angular/compiler': 'npm:@angular/compiler@12.2.16',
'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',
'devextreme/dist/js/vectormap-data': 'js/vectormap-data',
'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js',
'luxon': 'npm:luxon@1.28.0/build/global/luxon.min.js',
'es6-object-assign': 'npm:es6-object-assign@1.1.0',
'devextreme': 'npm:devextreme@22.1.4/cjs',
'devextreme/bundles/dx.all': 'npm:devextreme@22.1.4/bundles/dx.all.js',
'jszip': 'npm:jszip@3.7.1/dist/jszip.min.js',
'devextreme-quill': 'npm:devextreme-quill@1.5.16/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.1.63',
'devexpress-gantt': 'npm:devexpress-gantt@4.1.32',
'devextreme-angular': 'npm:devextreme-angular@22.1.4',
'@devextreme/runtime': 'npm:@devextreme/runtime@3.0.7',
'inferno': 'npm:inferno@7.4.4/dist/inferno.min.js',
'inferno-compat': 'npm:inferno-compat@7.4.11/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@7.4.11/dist/inferno-clone-vnode.min.js',
'inferno-create-class': 'npm:inferno-create-class@7.4.11/dist/inferno-create-class.min.js',
'inferno-extras': 'npm:inferno-extras@7.4.11/dist/inferno-extras.min.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@3.0.7/inferno/package.json',
'npm:@angular/*/package.json',
'npm:@angular/common@12.2.16/*/package.json',
'npm:rxjs@7.5.3/package.json',
'npm:rxjs@7.5.3/operators/package.json',
'npm:devextreme-angular@22.1.4/*/package.json',
'npm:devextreme-angular@22.1.4/ui/*/package.json',
'npm:devextreme-angular@22.1.4/package.json',
'npm:devexpress-diagram@2.1.63/package.json',
'npm:devexpress-gantt@4.1.32/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/22.1.4/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/22.1.4/css/dx.light.css" />
<script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script>
<script src="https://unpkg.com/zone.js@0.11.4/dist/zone.js"></script>
<script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script>
<script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>window.jQuery || document.write(decodeURIComponent('%3Cscript src="js/jquery.min.js"%3E%3C/script%3E'))</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>