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import { cloneDeep } from 'lodash-es';
export function isPosition(p: any): p is Position {
return Array.isArray(p) && p.length >= 2 && typeof p[0] === 'number' && typeof p[1] === 'number' && isFinite(p[0]) && isFinite(p[1]);
}
/**
* A position other than the unset [0, 0] default.
*/
export function hasLocation(v: any): v is [number, number] {
return isPosition(v)
&& v[0] >= -180 && v[0] <= 180
&& v[1] >= -90 && v[1] <= 90
&& (v[0] !== 0 || v[1] !== 0);
}
/**
* Centre of the bounds of every location in the Ref's geo plugins.
*/
export function geoCenter(plugins?: Record<string, any>): [number, number] | undefined {
const lons: number[] = [];
let s = Infinity, n = -Infinity;
const visit = (c: any) => {
if (hasLocation(c)) {
lons.push(c[0]);
s = Math.min(s, c[1]);
n = Math.max(n, c[1]);
} else if (Array.isArray(c)) {
c.forEach(visit);
}
};
for (const [key, value] of Object.entries(plugins || {})) {
if (!key.startsWith('plugin/geo/')) continue;
for (const f of geoFeatures(value, value?.geometry?.type === 'Point' ? hasLocation : isPosition)) visit((f.geometry as any).coordinates);
}
if (!lons.length) return undefined;
return [lonCenter(lons), (s + n) / 2];
}
/**
* Centre of the smallest longitude interval containing every longitude,
* allowing the interval to wrap across the antimeridian.
*/
function lonCenter(lons: number[]): number {
const sorted = [...lons].sort((a, b) => a - b);
const last = sorted.length - 1;
// The interval is the complement of the largest gap between neighbours
let gap = sorted[0] + 360 - sorted[last];
let west = sorted[0], east = sorted[last];
for (let i = 0; i < last; i++) {
if (sorted[i + 1] - sorted[i] > gap) {
gap = sorted[i + 1] - sorted[i];
west = sorted[i + 1];
east = sorted[i] + 360;
}
}
const c = (west + east) / 2;
return c > 180 ? c - 360 : c;
}
/**
* Smallest longitude interval containing all normalized longitudes, possibly
* crossing the antimeridian. Returns [west, east] with east >= west, where east
* may exceed 180 when the interval crosses the antimeridian.
*/
export function minimalLngInterval(lngs: number[]): [number, number] {
const sorted = [...lngs].sort((a, b) => a - b);
let gap = sorted[0] + 360 - sorted[sorted.length - 1];
let start = 0;
for (let i = 1; i < sorted.length; i++) {
const g = sorted[i] - sorted[i - 1];
if (g > gap) {
gap = g;
start = i;
}
}
const west = sorted[start];
const east = sorted[(start + sorted.length - 1) % sorted.length];
return [west, east < west ? east + 360 : east];
}
/**
* Bounds [west, south, east, north] of every location, possibly crossing
* the antimeridian, in which case east exceeds 180.
*/
export function locationBounds(coordinates: any): [number, number, number, number] | undefined {
const lngs: number[] = [];
let south = Infinity, north = -Infinity;
const visit = (c: any) => {
if (hasLocation(c)) {
lngs.push(c[0]);
south = Math.min(south, c[1]);
north = Math.max(north, c[1]);
} else if (Array.isArray(c)) {
c.forEach(visit);
}
};
visit(coordinates);
if (!lngs.length) return undefined;
const [west, east] = minimalLngInterval(lngs);
return [west, south, east, north];
}
/**
* A linear ring is closed with four or more positions, the first and last
* being identical (RFC 7946 3.1.6).
*/
export function isLinearRing(ring: Position[]): boolean {
if (ring.length < 4) return false;
const first = ring[0];
const last = ring[ring.length - 1];
return first.length === last.length && first.every((n, i) => n === last[i]);
}
/**
* Convert a feature or feature collection into renderable features. Rings are never closed
* automatically: invalid polygons are drawn as open lines and points so the
* map always shows exactly what is stored.
*/
export function geoFeatures(feature: any, valid: (p: any) => p is Position = isPosition): Feature[] {
if (feature?.type === 'FeatureCollection') {
return (Array.isArray(feature.features) ? feature.features : []).flatMap((f: any) => geoFeatures(f, valid));
}
const result: Feature[] = [];
const add = (geometry?: Geometry) => {
if (!geometry) return;
if (geometry.type === 'GeometryCollection') {
geometry.geometries.forEach(add);
E} else if (!Array.isArray(geometry.coordinates) || geometry.coordinates.length) {
result.push({ type: 'Feature', properties: feature?.properties || {}, geometry });
}
};
add(sanitize(feature?.geometry, valid));
return result;
}
function sanitize(geometry: any, valid: (p: any) => p is Position): Geometry | undefined {
const c = geometry?.coordinates;
const positions = (ps: any): Position[] => Array.isArray(ps) ? ps.filter(valid) : [];
const polygon = (rings: any[]) => toPolygon(rings.map(positions));
switch (geometry?.type) {
case 'Point':
return valid(c) ? { type: 'Point', coordinates: c } : undefined;
case 'MultiPoint':
return { type: 'MultiPoint', coordinates: positions(c) };
case 'LineString':
return line(positions(c));
case 'MultiLineString':
return {
type: 'GeometryCollection',
geometries: (Array.isArray(c) ? c : []).map(positions).filter(l => l.length).map(line),
};
case 'Polygon':
return polygon(Array.isArray(c) ? c : []);
case 'MultiPolygon': {
const polys = (Array.isArray(c) ? c : []).map(p => polygon(Array.isArray(p) ? p : []));
return { type: 'GeometryCollection', geometries: polys.filter(p => !!p) as Geometry[] };
}
case 'GeometryCollection':
return {
type: 'GeometryCollection',
geometries: (Array.isArray(geometry.geometries) ? geometry.geometries : []).map((g: any) => sanitize(g, valid)).filter((g: any) => !!g),
};
}
return undefined;
}
function line(ps: Position[]): Geometry {
return ps.length > 1 ? { type: 'LineString', coordinates: ps } : { type: 'MultiPoint', coordinates: ps };
}
function toPolygon(rings: Position[][]): Geometry | undefined {
const rs = rings.filter(r => r.length);
Iif (!rs.length) return undefined;
if (!isLinearRing(rings[0])) return { type: 'GeometryCollection', geometries: rs.map(line) };
const geometries: Geometry[] = [
{ type: 'Polygon', coordinates: rs.filter(isLinearRing) },
...rs.filter(r => !isLinearRing(r)).map(line),
];
return geometries.length === 1 ? geometries[0] : { type: 'GeometryCollection', geometries };
}
const DEPTH: Record<string, number> = {
Point: 0,
MultiPoint: 1,
LineString: 1,
MultiLineString: 2,
Polygon: 2,
MultiPolygon: 3,
};
/**
* Convert geometry to another GeoJSON geometry type, keeping as much as
* possible. Single geometries are wrapped when converting to a multi type,
* and the first is kept when converting back, except a multi point keeps
* every position. Polygon rings are lines that
* are closed when converting to a polygon, and opened when converting back.
* A geometry collection keeps every geometry when converting to a multi type,
* otherwise only the first.
*/
export function convertGeometry(geometry: any, type: string): Geometry {
Iif (!(type in DEPTH)) throw new Error('Unknown geometry type: ' + type);
if (geometry?.type === 'GeometryCollection') {
const geometries: any[] = Array.isArray(geometry.geometries) ? geometry.geometries : [];
if (!type.startsWith('Multi')) return convertGeometry(geometries[0], type);
return {
type,
coordinates: geometries.flatMap(g => (convertGeometry(g, type) as any).coordinates),
} as Geometry;
}
if (geometry?.type === type) return cloneDeep(geometry);
let depth = DEPTH[geometry?.type] ?? -1;
let c: any = cloneDeep(geometry?.coordinates);
// Open polygon rings into lines
if (depth === 2 && geometry.type === 'Polygon') c = openRings(c);
if (depth === 3) c = (Array.isArray(c) ? c : []).map(openRings);
if (depth === 0 && !hasLocation(c) || depth < 0 || depth > 0 && !Array.isArray(c)) {
// Nothing to keep
depth = 1;
c = [];
}
const target = DEPTH[type];
if (type === 'MultiPoint' && depth > 1) {
// Keep every position
c = c.flat(depth - 1);
depth = 1;
}
while (depth > target) {
c = depth === 1 ? c[0] : c[0] || [];
depth--;
}
while (depth < target) {
if (Array.isArray(c) && !c.length) {
depth = target;
break;
}
c = [c];
depth++;
}
if (target === 0 && !isPosition(c)) c = [0, 0];
if (type === 'Polygon') c = closeRings(c);
if (type === 'MultiPolygon') c = c.map(closeRings);
return { type, coordinates: c } as Geometry;
}
function openRings(rings: any): Position[][] {
return (Array.isArray(rings) ? rings : []).map((r: any) => Array.isArray(r) && isLinearRing(r) ? r.slice(0, -1) : r);
}
function closeRings(rings: Position[][]): Position[][] {
return rings.map(r => r.length >= 3 && !isLinearRing(r) ? [...r, [...r[0]]] : r);
}
/**
* Convert GeoJSON plugin data (a Feature or FeatureCollection) to the type of
* the plugin defaults, keeping as much as possible. A FeatureCollection keeps
* the properties of each feature, otherwise the first feature's properties
* are kept.
* Properties are dropped if not allowed.
*/
export function convertFeature(value: any, defaults: any, properties = true): any {
Iif (!defaults?.type) return undefined;
const sourceFeatures: any[] = value?.type === 'FeatureCollection'
? (Array.isArray(value.features) ? value.features : [])
: value?.geometry ? [value] : [];
Iif (!sourceFeatures.length) return undefined;
const result: any = cloneDeep(defaults);
Iif (value.bbox) result.bbox = cloneDeep(value.bbox);
if (defaults.type === 'FeatureCollection') {
const template = defaults.features?.[0];
result.features = sourceFeatures.map(f => ({
type: 'Feature',
...f.properties ? { properties: cloneDeep(f.properties) } : {},
geometry: template?.geometry?.type ? convertGeometry(f.geometry, template.geometry.type) : cloneDeep(f.geometry),
}));
return result;
}
const type = defaults.geometry?.type;
Iif (!type) return undefined;
const geometry = sourceFeatures.length === 1
? sourceFeatures[0].geometry
: { type: 'GeometryCollection', geometries: sourceFeatures.map(f => f.geometry).filter(g => !!g) };
result.geometry = convertGeometry(geometry, type);
const props = sourceFeatures.find(f => f.properties)?.properties;
if (properties && props) result.properties = cloneDeep(props);
return result;
}
export interface MapView {
center: [number, number];
zoom: number;
}
/**
* Format a map view for the URL as lng,lat,zoom.
*/
export function formatMapView(view?: MapView) {
Iif (!view) return '';
const fixed = (n: number, digits: number) => '' + (Math.round(n * 10 ** digits) / 10 ** digits);
return [fixed(view.center[0], 5), fixed(view.center[1], 5), fixed(view.zoom, 2)].join(',');
}
/**
* Parse a map view from the URL formatted as lng,lat,zoom.
*/
export function parseMapView(value?: string | null): MapView | undefined {
if (!value || typeof value !== 'string') return undefined;
const parts = value.split(',');
if (parts.length !== 3 || parts.some(p => !p.trim())) return undefined;
const [lng, lat, zoom] = parts.map(Number);
if (![lng, lat, zoom].every(isFinite)) return undefined;
if (Math.abs(lng) > 180 || Math.abs(lat) > 90 || zoom < 0 || zoom > 24) return undefined;
return { center: [lng, lat], zoom };
}
/**
* Parse a "lng, lat" location, optionally wrapped in brackets like a GeoJSON position.
*/
export function parseLocation(value?: string | null): [number, number] | undefined {
Iif (!value || typeof value !== 'string') return undefined;
const parts = value.trim().replace(/^\[(.*)]$/s, '$1').split(',');
if (parts.length !== 2 || parts.some(p => !p.trim())) return undefined;
const [lng, lat] = parts.map(Number);
if (!isFinite(lng) || !isFinite(lat)) return undefined;
if (Math.abs(lng) > 180 || Math.abs(lat) > 90) return undefined;
return [lng, lat];
}
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