Vector2FunctionClipLibrary   "Vector2FunctionClip" 
Sutherland-Hodgman polygon clipping algorithm.
reference:
.
rosettacode.org
.
 clip(source, reference) 
  Perform Clip operation on a vector with another.
  Parameters:
     source : array . Source polygon to be clipped.
     reference : array . Reference polygon to clip source.
  Returns: array.
