@defgroup GlobalFuncs Global environment
Functions for optionally setting the behavior of the TG environment.
These, if desired, should be called only once at program start up and prior
to calling any other tg_*() functions.
A geometry is the common generic type that can represent a Point,
LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon, or
GeometryCollection.
A rectangle defined by a minimum and maximum coordinates.
Returned by the tg_geom_rect(), tg_ring_rect(), and other \*_rect()
functions for getting a geometry’s minumum bounding rectangle.
Also used internally for geometry indexing.
A ring is series of tg_segment which creates a shape that does not
self-intersect and is fully closed, where the start and end points are the
exact same value.