Arbitrary map extents

Create maps with arbitrary extents.

100% Map style by Stamen Design, © OpenStreetMap contributors

Map extents can be of any size. They will be subdivided into tiles accordingly.

index.js

import { Vector3, Object3D } from 'three';
import { MapControls } from 'three/examples/jsm/controls/MapControls.js';
import StadiaMaps from 'ol/source/StadiaMaps.js';

import Extent from '@giro3d/giro3d/core/geographic/Extent.js';
import Instance from '@giro3d/giro3d/core/Instance.js';
import ColorLayer from '@giro3d/giro3d/core/layer/ColorLayer.js';
import Map from '@giro3d/giro3d/entities/Map.js';
import Inspector from '@giro3d/giro3d/gui/Inspector.js';
import Helpers from '@giro3d/giro3d/helpers/Helpers.js';
import TiledImageSource from '@giro3d/giro3d/sources/TiledImageSource.js';

// Defines geographic extent: CRS, min/max X, min/max Y
const EPSG3857_BOUNDS = new Extent(
    'EPSG:3857',
    -20037508.342789244,
    20037508.342789244,
    -20037508.342789244,
    20037508.342789244,
);

let currentMap;

// `viewerDiv` will contain Giro3D' rendering area (the canvas element)
const viewerDiv = document.getElementById('viewerDiv');

// Creates a Giro3D instance
const instance = new Instance(viewerDiv, {
    crs: EPSG3857_BOUNDS.crs(),
    renderer: {
        clearColor: 0x0a3b59,
    },
});

// Instanciates controls
const controls = new MapControls(instance.camera.camera3D, instance.domElement);
instance.camera.camera3D.position.set(0, 0, 100000000);

instance.useTHREEControls(controls);

Inspector.attach(document.getElementById('panelDiv'), instance);

instance.notifyChange();

const layers = ['stamen_watercolor', 'stamen_toner', 'stamen_terrain'];

let mapCount = 0;

// Create a grid that encompasses the whole EPSG:3857 bounds.
const grid = Helpers.createGrid(new Vector3(0, 0, -10000), EPSG3857_BOUNDS.dimensions().x, 20);
instance.threeObjects.add(grid);

function createMap(extent) {
    if (currentMap) {
        instance.remove(currentMap);
        currentMap = null;
    }

    mapCount++;
    const object3d = new Object3D();
    // Creates a map that will contain the layer
    currentMap = new Map(`${mapCount}`, {
        extent,
        maxSubdivisionLevel: 10,
        object3d,
        showOutline: true,
    });

    currentMap.object3d.position.set(0, 0, mapCount * 10000);

    instance.add(currentMap);

    // Adds an TMS imagery layer
    const layer = layers[mapCount % layers.length];
    currentMap
        .addLayer(
            new ColorLayer({
                name: 'osm',
                extent,
                source: new TiledImageSource({ source: new StadiaMaps({ layer, wrapX: false }) }),
            }),
        )
        .catch(e => console.error(e));

    instance.notifyChange();
}

const button = document.getElementById('createMap');

button.onclick = () => {
    const x0 = Math.random();
    const x1 = Math.random();
    const y0 = Math.random();
    const y1 = Math.random();

    const dimensions = EPSG3857_BOUNDS.dimensions();

    const west = EPSG3857_BOUNDS.west() + Math.min(x0, x1) * dimensions.x;
    const east = EPSG3857_BOUNDS.west() + Math.max(x0, x1) * dimensions.x;

    const north = EPSG3857_BOUNDS.south() + Math.max(y0, y1) * dimensions.y;
    const south = EPSG3857_BOUNDS.south() + Math.min(y0, y1) * dimensions.y;

    const extent = new Extent('EPSG:3857', west, east, south, north);

    createMap(extent);
};

index.html

<!doctype html>
<html lang="en">
    <head>
        <title>Arbitrary map extents</title>
        <meta charset="UTF-8" />
        <meta name="name" content="arbitrary_map_extents" />
        <meta name="description" content="Create maps with arbitrary extents." />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />

        <link rel="icon" href="https://giro3d.org/images/favicon.svg" />
        <link href="https://giro3d.org/assets/bootstrap-custom.css" rel="stylesheet" />
        <script src="https://giro3d.org/assets/bootstrap.bundle.min.js"></script>
        <link
            rel="stylesheet"
            type="text/css"
            href="https://giro3d.org/latest/css/example.css"
        />

        
    </head>

    <body>
        <div id="viewerDiv" class="m-0 p-0 w-100 h-100"></div>
        <div id="panelDiv" class="position-absolute top-0 start-0 mh-100 overflow-auto"></div>

        <div class="side-pane-with-status-bar">
            <button class="btn btn-primary" id="createMap">Create new map</button>
        </div>

        <script type="module" src="index.js"></script>
        <script>
            /* activate popovers */
            const popoverTriggerList = [].slice.call(
                document.querySelectorAll('[data-bs-toggle="popover"]'),
            );
            popoverTriggerList.map(
                // bootstrap is used as script in the template, disable warning about undef
                // eslint-disable-next-line no-undef
                popoverTriggerEl =>
                    new bootstrap.Popover(popoverTriggerEl, {
                        trigger: 'hover',
                        placement: 'left',
                        content: document.getElementById(
                            popoverTriggerEl.getAttribute('data-bs-content'),
                        ).innerHTML,
                        html: true,
                    }),
            );
        </script>
    </body>
</html>

package.json

{
    "name": "arbitrary_map_extents",
    "dependencies": {
        "@giro3d/giro3d": "0.37.3"
    },
    "devDependencies": {
        "vite": "^3.2.3"
    },
    "scripts": {
        "start": "vite",
        "build": "vite build"
    }
}