demarches-normaliennes/app/javascript/components/shared/mapbox/utils.js
2021-05-24 11:57:00 +02:00

72 lines
1.8 KiB
JavaScript

import { LngLatBounds } from 'mapbox-gl';
export function getBounds(geometry) {
const bbox = new LngLatBounds();
if (geometry.type === 'Point') {
return [geometry.coordinates, geometry.coordinates];
} else if (geometry.type === 'LineString') {
for (const coordinate of geometry.coordinates) {
bbox.extend(coordinate);
}
} else {
for (const coordinate of geometry.coordinates[0]) {
bbox.extend(coordinate);
}
}
return bbox;
}
export function findFeature(featureCollection, value, property = 'id') {
return featureCollection.features.find(
(feature) => feature.properties[property] === value
);
}
export function filterFeatureCollection(featureCollection, source) {
return {
type: 'FeatureCollection',
features: featureCollection.features.filter(
(feature) => feature.properties.source === source
)
};
}
export function filterFeatureCollectionByGeometryType(featureCollection, type) {
return {
type: 'FeatureCollection',
features: featureCollection.features.filter(
(feature) => feature.geometry.type === type
)
};
}
export function generateId() {
return Math.random().toString(20).substr(2, 6);
}
export function getCenter(geometry, lngLat) {
const bbox = new LngLatBounds();
switch (geometry.type) {
case 'Point':
return [...geometry.coordinates];
case 'LineString':
return [lngLat.lng, lngLat.lat];
default:
for (const coordinate of geometry.coordinates[0]) {
bbox.extend(coordinate);
}
return bbox.getCenter();
}
}
export function defer() {
const deferred = {};
const promise = new Promise(function (resolve, reject) {
deferred.resolve = resolve;
deferred.reject = reject;
});
deferred.promise = promise;
return deferred;
}