Node:Returning Points for Rectangles, Next:Querying Rectangles, Previous:Rectangle Operators, Up:Rectangle Reference
Point corner (unsigned short c)  Function 
Returns the corner Point indicated by the argument c, which must be
between 0 and 3.

Point mid_point (unsigned short m)  const function 
Returns the midpoint of one of the sides. The argument c must be between 0 and 3. 