>># 
>># Copyright 1990, 1991 by the Massachusetts Institute of Technology and
>># UniSoft Group Limited.
>># 
>># Permission to use, copy, modify, distribute, and sell this software and
>># its documentation for any purpose is hereby granted without fee,
>># provided that the above copyright notice appear in all copies and that
>># both that copyright notice and this permission notice appear in
>># supporting documentation, and that the names of MIT and UniSoft not be
>># used in advertising or publicity pertaining to distribution of the
>># software without specific, written prior permission.  MIT and UniSoft
>># make no representations about the suitability of this software for any
>># purpose.  It is provided "as is" without express or implied warranty.
>># 
>># $XConsortium: pntinrgn.m,v 1.7 92/06/11 17:38:06 rws Exp $
>># 
>>#
>>TITLE XPointInRegion CH10
>>ASSERTION A XPointInRegion-1
When the point specified by the x and y arguments is
contained in the region r, then a call to XPointInRegion
returns True.
>>STRATEGY
Create a region using XCreateRegion.
Set the region to a polygon using XPolygonRegion.
Obtain the smallest rectangle covering the region using XClipBox.
For each  point in the covered area:
   Determine whether the point is in the region using XPointInRegion.
   Obtain the union of a region formed from the point and the region.
   If the point is in the region:
      Verify that the union is the same as the initial region using XEqualRegion.
>>ASSERTION A XPointInRegion-2
When the point specified by the x and y arguments is not
contained in the region r, then a call to XPointInRegion
returns False.
>>STRATEGY
Create a region using XCreateRegion.
Set the region to a polygon using XPolygonRegion.
Obtain the smallest rectangle covering the region using XClipBox.
For each  point in the covered area:
   Determine whether the point is in the region using XPointInRegion.
   Obtain the union of a region formed from the point and the region.
   If the point is not in the region:
      Verify that the union is not the same as the initial region using XEqualRegion.
