anchor.diff:  ;;;   Created: 1998-12-02 19:26
   ;;;    Author: Gilbert Baumann <unk6@rz.uni-karlsruhe.de>
   ;;;   License: LGPL (See file COPYING for details).
  -;;;       $Id: regions.lisp,v 1.11 2001-07-12 15:17:31 gilbert Exp $
  +;;;       $Id: regions.lisp,v 1.12 2001-07-17 05:50:51 gilbert Exp $
   ;;; --------------------------------------------------------------------------------------
  -;;;  (c) copyright 1998,1999 by Gilbert Baumann
  +;;;  (c) copyright 1998,1999,2001 by Gilbert Baumann
   ;;;  (c) copyright 2001 by Arnaud Rouanet (rouanet@emi.u-bordeaux.fr)
   
   ;;; This library is free software; you can redistribute it and/or
  
positive.code: ;;;                     REGION is now a subclass of DESIGN.
  ;;;  2001-01-21  GB     fixed bug in (TRANSFORM-REGION T RECTANGLE-SET)
  ;;;                     added some documentation
  
  ;;; ---- TODO ----------------------------------------------------------------------------
  
  
negative.code: 
  ;;;  When        Who    What
  ;;; --------------------------------------------------------------------------------------
  ;;;  2001-07-16  GB     added (REGION-CONTAINS-POSITION-P STANDARD-ELLIPSE ..)
  ;;;                     added (BOUNDING-RECTANGLE* STANDARD-ELLIPSE)
  ;;;                     added (REGION-INTERSECTION LINE STANDARD-ELLIPSE) and vice versa
  ;;;  2001-07-12  GB     fixed bugs in
  ;;;                     (BOUNDING-RECTANGLE* STANDARD-REGION-UNION)
  ;;;                     (BOUNDING-RECTANGLE* STANDARD-REGION-INTERSECTION)
  