#### 5.2.4 Points and vectors

Planar points and vectors can be stored in similar structures:

struct geom_point {
real x, y;
};
struct geom_vector {
real dx, dy;
};

It is safe to type-cast between these structures any time. Some simple manipulation routines and constants are defined in geomlib/vector.h.
Any finite values of coordinates are supported in GEOMLIB but in some specific situations, extremely small or large values can lead to
numerical problems.