Understand if a GeoJsonLayer contains a given point

Question

I'm trying to understand if a given point (Latitude, Longitude) stays inside a GeoJsonLayer. I've written this function but I don't have a bounding box for the layer so it's not working:

private fun isInsideLayer(userLatitude: Double, userLongitude: Double, layer: GeoJsonLayer): Boolean {
        val position = LatLng(userLatitude, userLongitude)
        return layer.boundingBox.contains(position)
    }

Below there's my JSON source.

 {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [
              13.36761474609375,
              52.626602989514865
            ],
            [
              13.379974365234373,
              52.616181784632865
            ],
            [
              13.380317687988281,
              52.606175093642754
            ],
            [
              13.36761474609375,
              52.626602989514865
            ]
          ]
        ]
      }
    }

Anybody has a clue? Thanks

Answer 1

this is quite a theoretical question, unless knowing which kind of geometries are present - because a geometry is not necessarily a polygon, which could contain a point. else one could only check if a point matches exactly. the fundamental problem is that .getBoundingBox() returns a rectangle - and not a polygon, which does not permit proper matching due to the surrounding excess area.

eg. in order to construct a polygon there would be (at least) 3 geometries of type point required.

or (at least) 1 geometry of type polygon... which could be matched with Utility Library's PolyUtil:

PolyUtil.containsLocation(position)

there are overall 10 different geometry objects for a feature object, which would need to be considered... is what RFC 7946 hints for.