jsts
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A JavaScript library of spatial predicates and functions for processing geometry
47 lines (45 loc) • 2.46 kB
JavaScript
import LineString from '../../../geom/LineString.js'
import Geometry from '../../../geom/Geometry.js'
import Coordinate from '../../../geom/Coordinate.js'
import Polygon from '../../../geom/Polygon.js'
import LineSegment from '../../../geom/LineSegment.js'
import PointPairDistance from './PointPairDistance.js'
import GeometryCollection from '../../../geom/GeometryCollection.js'
export default class DistanceToPointFinder {
static computeDistance() {
if (arguments[2] instanceof PointPairDistance && (arguments[0] instanceof LineString && arguments[1] instanceof Coordinate)) {
const line = arguments[0], pt = arguments[1], ptDist = arguments[2]
const coords = line.getCoordinates()
const tempSegment = new LineSegment()
for (let i = 0; i < coords.length - 1; i++) {
tempSegment.setCoordinates(coords[i], coords[i + 1])
const closestPt = tempSegment.closestPoint(pt)
ptDist.setMinimum(closestPt, pt)
}
} else if (arguments[2] instanceof PointPairDistance && (arguments[0] instanceof Polygon && arguments[1] instanceof Coordinate)) {
const poly = arguments[0], pt = arguments[1], ptDist = arguments[2]
DistanceToPointFinder.computeDistance(poly.getExteriorRing(), pt, ptDist)
for (let i = 0; i < poly.getNumInteriorRing(); i++)
DistanceToPointFinder.computeDistance(poly.getInteriorRingN(i), pt, ptDist)
} else if (arguments[2] instanceof PointPairDistance && (arguments[0] instanceof Geometry && arguments[1] instanceof Coordinate)) {
const geom = arguments[0], pt = arguments[1], ptDist = arguments[2]
if (geom instanceof LineString) {
DistanceToPointFinder.computeDistance(geom, pt, ptDist)
} else if (geom instanceof Polygon) {
DistanceToPointFinder.computeDistance(geom, pt, ptDist)
} else if (geom instanceof GeometryCollection) {
const gc = geom
for (let i = 0; i < gc.getNumGeometries(); i++) {
const g = gc.getGeometryN(i)
DistanceToPointFinder.computeDistance(g, pt, ptDist)
}
} else {
ptDist.setMinimum(geom.getCoordinate(), pt)
}
} else if (arguments[2] instanceof PointPairDistance && (arguments[0] instanceof LineSegment && arguments[1] instanceof Coordinate)) {
const segment = arguments[0], pt = arguments[1], ptDist = arguments[2]
const closestPt = segment.closestPoint(pt)
ptDist.setMinimum(closestPt, pt)
}
}
}