GetOrDefault provides default map functionality to existing maps that aren't a DefaultMap.

Cuboid is a volume defined by two X, Y, Z coordinates.

Point is an X, Y coordinate of a given numeric type.

Point3D is an X, Y, Z coordinate of a given numeric type.

PointPlusData is an X, Y coordinate, and some associated data.

Rectangle is an area defined by two X, Y coordinates at the top left and bottom right corners.