Display a TopoJSON file on a Map.
import TopoJSON from 'ol/format/TopoJSON.js';
import OSM from 'ol/source/OSM.js';
import { Fill, Stroke, Style } from 'ol/style.js';
import { MapControls } from 'three/examples/jsm/controls/MapControls.js';
import { CSS2DObject } from 'three/examples/jsm/renderers/CSS2DRenderer.js';
import ColorLayer from '@giro3d/giro3d/core/layer/ColorLayer.js';
import Extent from '@giro3d/giro3d/core/geographic/Extent.js';
import Instance from '@giro3d/giro3d/core/Instance.js';
import Map from '@giro3d/giro3d/entities/Map.js';
import VectorSource from '@giro3d/giro3d/sources/VectorSource.js';
import Inspector from '@giro3d/giro3d/gui/Inspector.js';
import TiledImageSource from '@giro3d/giro3d/sources/TiledImageSource.js';
import Coordinates from '@giro3d/giro3d/core/geographic/Coordinates.js';
Instance.registerCRS(
'EPSG:30174',
'+proj=tmerc +lat_0=26 +lon_0=142 +k=0.9999 +x_0=0 +y_0=0 +ellps=bessel +towgs84=-146.414,507.337,680.507,0,0,0,0 +units=m +no_defs +type=crs',
);
// Defines geographic extent: CRS, min/max X, min/max Y
const extent = new Extent(
'EPSG:30174',
-201012.900985493,
-198191.63799031873,
1066954.2964232096,
1071890.8856167798,
);
// `viewerDiv` will contain Giro3D' rendering area (the canvas element)
const viewerDiv = document.getElementById('viewerDiv');
// Creates a Giro3D instance
const instance = new Instance(viewerDiv, {
crs: extent.crs(),
});
// Instanciates camera
const center = extent.centerAsVector2();
instance.camera.camera3D.position.set(center.x, center.y - 1, 2000);
// Instanciates controls
const controls = new MapControls(instance.camera.camera3D, instance.domElement);
controls.enableDamping = true;
controls.dampingFactor = 0.25;
instance.useTHREEControls(controls);
// target
controls.target.set(center.x, center.y, 0);
// Adds layers in a map
const map = new Map('planar', { extent, backgroundColor: '#135D66' });
instance.add(map);
const buildingsStyle = feature => {
const highlight = feature.get('highlight');
const stroke = highlight
? new Stroke({
color: 'white',
width: 2,
})
: undefined;
return new Style({
zIndex: highlight ? 1 : 0,
fill: new Fill({
color: highlight ? 'green' : 'red',
}),
stroke,
});
};
const buildingsLayer = new ColorLayer({
name: 'Buildings',
extent,
source: new VectorSource({
format: new TopoJSON(),
data: 'https://3d.oslandia.com/giro3d/vectors/tokyo_buildings.topojson',
dataProjection: 'EPSG:4326',
style: buildingsStyle,
}),
});
// Create the OpenStreetMap color layer using an OpenLayers source.
// See https://openlayers.org/en/latest/apidoc/module-ol_source_OSM-OSM.html
// for more informations.
const osm = new ColorLayer({
name: 'osm',
source: new TiledImageSource({ source: new OSM() }),
extent,
});
map.addLayer(osm);
map.addLayer(buildingsLayer);
const labelElement = document.createElement('span');
labelElement.classList = 'badge rounded-pill text-bg-light';
labelElement.style.marginTop = '2rem';
const label = new CSS2DObject(labelElement);
label.visible = false;
instance.add(label);
let previousFeature;
function pickFeatures(mouseEvent) {
const pickResult = instance.pickObjectsAt(mouseEvent, {
radius: 0,
});
const picked = pickResult.at(0);
function resetPickedFeatures() {
if (previousFeature) {
previousFeature.set('highlight', false);
buildingsLayer.source.updateFeature(previousFeature);
}
if (label.visible) {
label.visible = false;
}
previousFeature = null;
}
if (picked) {
const { x, y } = picked.point;
const features = buildingsLayer.getVectorFeaturesAtCoordinate(
new Coordinates(instance.referenceCrs, x, y),
);
if (features.length > 0) {
const firstFeature = features[0];
previousFeature?.set('highlight', false);
firstFeature.set('highlight', true);
if (previousFeature !== firstFeature) {
buildingsLayer.source.updateFeature(previousFeature, firstFeature);
previousFeature = firstFeature;
}
instance.notifyChange(map);
label.position.set(x, y, 100);
label.visible = true;
label.element.innerText = firstFeature.get('osm_id');
label.updateMatrixWorld(true);
} else {
resetPickedFeatures();
}
} else {
resetPickedFeatures();
}
}
instance.domElement.addEventListener('mousemove', pickFeatures);
Inspector.attach(document.getElementById('panelDiv'), instance);
instance.domElement.addEventListener('dblclick', e => console.log(instance.pickObjectsAt(e)));
instance.notifyChange(map);
<!doctype html>
<html lang="en">
<head>
<title>TopoJSON</title>
<meta charset="UTF-8" />
<meta name="name" content="ol_vector_topojson" />
<meta name="description" content="Display a TopoJSON file on a Map." />
<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/next/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>
<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>
{
"name": "ol_vector_topojson",
"dependencies": {
"@giro3d/giro3d": "git+https://gitlab.com/giro3d/giro3d.git"
},
"devDependencies": {
"vite": "^3.2.3"
},
"scripts": {
"start": "vite",
"build": "vite build"
}
}