jsts
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A JavaScript library of spatial predicates and functions for processing geometry
43 lines (41 loc) • 1.59 kB
JavaScript
import TreeSet from '../../../../../java/util/TreeSet.js'
import GeometryCombiner from '../../geom/util/GeometryCombiner.js'
import CoordinateArrays from '../../geom/CoordinateArrays.js'
import PointLocator from '../../algorithm/PointLocator.js'
import Location from '../../geom/Location.js'
export default class PointGeometryUnion {
constructor() {
PointGeometryUnion.constructor_.apply(this, arguments)
}
static constructor_() {
this._pointGeom = null
this._otherGeom = null
this._geomFact = null
const pointGeom = arguments[0], otherGeom = arguments[1]
this._pointGeom = pointGeom
this._otherGeom = otherGeom
this._geomFact = otherGeom.getFactory()
}
static union(pointGeom, otherGeom) {
const unioner = new PointGeometryUnion(pointGeom, otherGeom)
return unioner.union()
}
union() {
const locater = new PointLocator()
const exteriorCoords = new TreeSet()
for (let i = 0; i < this._pointGeom.getNumGeometries(); i++) {
const point = this._pointGeom.getGeometryN(i)
const coord = point.getCoordinate()
const loc = locater.locate(coord, this._otherGeom)
if (loc === Location.EXTERIOR) exteriorCoords.add(coord)
}
if (exteriorCoords.size() === 0) return this._otherGeom
let ptComp = null
const coords = CoordinateArrays.toCoordinateArray(exteriorCoords)
if (coords.length === 1)
ptComp = this._geomFact.createPoint(coords[0])
else
ptComp = this._geomFact.createMultiPointFromCoords(coords)
return GeometryCombiner.combine(ptComp, this._otherGeom)
}
}