89 lines
2.4 KiB
TypeScript
89 lines
2.4 KiB
TypeScript
import type { LngLat, LngLatLike, LngLatBoundsLike } from 'maplibre-gl';
|
|
import type { Geometry, FeatureCollection, Feature } from 'geojson';
|
|
import { LngLatBounds } from 'maplibre-gl';
|
|
import invariant from 'tiny-invariant';
|
|
|
|
export function getBounds(geometry: Geometry): LngLatBoundsLike {
|
|
const bbox = new LngLatBounds();
|
|
|
|
if (geometry.type === 'Point') {
|
|
return [geometry.coordinates, geometry.coordinates] as [
|
|
[number, number],
|
|
[number, number]
|
|
];
|
|
} else if (geometry.type === 'LineString') {
|
|
for (const coordinate of geometry.coordinates) {
|
|
bbox.extend(coordinate as [number, number]);
|
|
}
|
|
} else {
|
|
invariant(
|
|
geometry.type != 'GeometryCollection',
|
|
'GeometryCollection not supported'
|
|
);
|
|
for (const coordinate of geometry.coordinates[0]) {
|
|
bbox.extend(coordinate as [number, number]);
|
|
}
|
|
}
|
|
return bbox;
|
|
}
|
|
|
|
export function findFeature<G extends Geometry>(
|
|
featureCollection: FeatureCollection<G>,
|
|
value: unknown,
|
|
property = 'id'
|
|
): Feature<G> | null {
|
|
return (
|
|
featureCollection.features.find(
|
|
(feature) => feature.properties && feature.properties[property] === value
|
|
) ?? null
|
|
);
|
|
}
|
|
|
|
export function filterFeatureCollection<G extends Geometry>(
|
|
featureCollection: FeatureCollection<G>,
|
|
source: string
|
|
): FeatureCollection<G> {
|
|
return {
|
|
type: 'FeatureCollection',
|
|
features: featureCollection.features.filter(
|
|
(feature) => feature.properties?.source === source
|
|
)
|
|
};
|
|
}
|
|
|
|
export function filterFeatureCollectionByGeometryType<G extends Geometry>(
|
|
featureCollection: FeatureCollection<G>,
|
|
type: Geometry['type']
|
|
): FeatureCollection<G> {
|
|
return {
|
|
type: 'FeatureCollection',
|
|
features: featureCollection.features.filter(
|
|
(feature) => feature.geometry.type === type
|
|
)
|
|
};
|
|
}
|
|
|
|
export function generateId(): string {
|
|
return Math.random().toString(20).substring(2, 6);
|
|
}
|
|
|
|
export function getCenter(geometry: Geometry, lngLat: LngLat): LngLatLike {
|
|
const bbox = new LngLatBounds();
|
|
|
|
invariant(
|
|
geometry.type != 'GeometryCollection',
|
|
'GeometryCollection not supported'
|
|
);
|
|
|
|
switch (geometry.type) {
|
|
case 'Point':
|
|
return [...geometry.coordinates] as [number, number];
|
|
case 'LineString':
|
|
return [lngLat.lng, lngLat.lat];
|
|
default:
|
|
for (const coordinate of geometry.coordinates[0]) {
|
|
bbox.extend(coordinate as [number, number]);
|
|
}
|
|
return bbox.getCenter();
|
|
}
|
|
}
|