booleanWithin function

bool booleanWithin(GeoJSONObject feature1, GeoJSONObject feature2)

Returns true if the first GeoJSONObject is completely within the second GeoJSONObject. The interiors of both geometries must intersect and, the interior and boundary of the primary (geometry a) must not intersect the exterior of the secondary (geometry b). booleanWithin returns the exact opposite result of booleanContains.

example:

final point = Point(coordinates: [1, 2]);
final line = LineString(
  coordinates: [
    Position.of([1, 1]),
    Position.of([1, 2]),
    Position.of([1, 3]),
    Position.of([1, 4])
  ],
);
final isWithin = booleanWithin(point, line); // true

Implementation

bool booleanWithin(
  GeoJSONObject feature1,
  GeoJSONObject feature2,
) {
  final geom1 = getGeom(feature1);
  final geom2 = getGeom(feature2);

  switch (geom1.runtimeType) {
    case Point:
      final point = geom1 as Point;
      switch (geom2.runtimeType) {
        case MultiPoint:
          return isPointInMultiPoint(point, geom2 as MultiPoint);
        case LineString:
          return isPointOnLine(point, geom2 as LineString);
        case Polygon:
          return isPointInPolygon(point, geom2 as Polygon);
        case MultiPolygon:
          return isPointInMultiPolygon(point, geom2 as MultiPolygon);
        default:
          throw GeometryCombinationNotSupported(geom1, geom2);
      }
    case MultiPoint:
      final multipoint = geom1 as MultiPoint;
      switch (geom2.runtimeType) {
        case MultiPoint:
          return isMultiPointInMultiPoint(multipoint, geom2 as MultiPoint);
        case LineString:
          return isMultiPointOnLine(multipoint, geom2 as LineString);
        case Polygon:
          return isMultiPointInPolygon(multipoint, geom2 as Polygon);
        case MultiPolygon:
          return isMultiPointInMultiPolygon(multipoint, geom2 as MultiPolygon);
        default:
          throw GeometryCombinationNotSupported(geom1, geom2);
      }
    case LineString:
      final line = geom1 as LineString;
      switch (geom2.runtimeType) {
        case LineString:
          return isLineOnLine(line, geom2 as LineString);
        case Polygon:
          return isLineInPolygon(line, geom2 as Polygon);
        case MultiPolygon:
          return isLineInMultiPolygon(line, geom2 as MultiPolygon);
        default:
          throw GeometryCombinationNotSupported(geom1, geom2);
      }
    case Polygon:
      final polygon = geom1 as Polygon;
      switch (geom2.runtimeType) {
        case Polygon:
          return isPolygonInPolygon(polygon, geom2 as Polygon);
        case MultiPolygon:
          return isPolygonInMultiPolygon(polygon, geom2 as MultiPolygon);
        default:
          throw GeometryCombinationNotSupported(geom1, geom2);
      }
    default:
      throw GeometryCombinationNotSupported(geom1, geom2);
  }
}