-- Created on: 1994-08-25
-- Created by: Jacques GOUSSARD
-- Copyright (c) 1994-1999 Matra Datavision
-- Copyright (c) 1999-2014 OPEN CASCADE SAS
--
-- This file is part of Open CASCADE Technology software library.
--
-- This library is free software; you can redistribute it and/or modify it under
-- the terms of the GNU Lesser General Public License version 2.1 as published
-- by the Free Software Foundation, with special exception defined in the file
-- OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
-- distribution for complete text of the license and disclaimer of any warranty.
--
-- Alternatively, this file may be used under the terms of Open CASCADE
-- commercial license or contractual agreement.

deferred class Modification from BRepTools

	---Purpose:  Defines geometric modifications to a shape, i.e.
-- changes to faces, edges and vertices.

inherits TShared from MMgt

uses Face     from TopoDS,
     Edge     from TopoDS,
     Vertex   from TopoDS,
     Location from TopLoc,
     
     Shape    from GeomAbs,
     
     Surface  from Geom,
     Curve    from Geom,
     Curve    from Geom2d,
     Pnt      from gp


is

    NewSurface(me: mutable; F        :     Face     from TopoDS;
                            S        : out Surface  from Geom;
		            L        : out Location from TopLoc;
		            Tol      : out Real     from Standard;
                            RevWires : out Boolean from Standard;
                            RevFace  : out Boolean from Standard)
    
      	---Purpose: Returns true if the face, F, has been modified.
-- If the face has been modified:
-- - S is the new geometry of the face,
-- - L is its new location, and
-- - Tol is the new tolerance.
-- The flag, RevWires, is set to true when the
-- modification reverses the normal of the surface, (i.e.
-- the wires have to be reversed).
-- The flag, RevFace, is set to true if the orientation of
-- the modified face changes in the shells which contain it.
-- If the face has not been modified this function returns
-- false, and the values of S, L, Tol, RevWires and
-- RevFace are not significant.
    
    	returns Boolean from Standard
	is deferred;

	
    NewCurve(me: mutable; E  :     Edge     from TopoDS;
                          C  : out Curve    from Geom;
		          L  : out Location from TopLoc;
		          Tol: out Real     from Standard)
    
    	returns Boolean from Standard
	
	---Purpose: Returns true if the edge, E, has been modified.
-- If the edge has been modified:
-- - C is the new geometry associated with the edge,
-- - L is its new location, and
-- - Tol is the new tolerance.
--   If the edge has not been modified, this function
-- returns false, and the values of C, L and Tol are not significant.

	is deferred;
	
    

    NewPoint(me: mutable; V  :     Vertex   from TopoDS;
                          P  : out Pnt      from gp;
		          Tol: out Real     from Standard)
    
    	returns Boolean from Standard

	---Purpose: Returns true if the vertex V has been modified.
-- If V has been modified:
-- - P is the new geometry of the vertex, and
-- - Tol is the new tolerance.
--   If the vertex has not been modified this function
-- returns false, and the values of P and Tol are not significant.

	is deferred;
	
    

    NewCurve2d(me: mutable;  E    :     Edge     from TopoDS;
                             F    :     Face     from TopoDS;
                             NewE :     Edge     from TopoDS;
                             NewF :     Face     from TopoDS;
                             C    : out Curve    from Geom2d;
		             Tol  : out Real     from Standard)
    
    	returns Boolean from Standard

---Purpose: Returns true if the edge, E, has a new curve on
-- surface on the face, F.
-- If a new curve exists:
-- - C is the new geometry of the edge,
-- - L is the new location, and
-- - Tol is the new tolerance.
--   NewE is the new edge created from E, and NewF is
-- the new face created from F.
-- If there is no new curve on the face, this function
-- returns false, and the values of C, L and Tol are not significant.

	is deferred;
	
    

    NewParameter(me: mutable; V  :     Vertex   from TopoDS;
                              E  :     Edge     from TopoDS;
                              P  : out Real     from Standard;
  		              Tol: out Real     from Standard)
    
    	returns Boolean from Standard

	---Purpose: Returns true if the vertex V has a new parameter on the edge E.
-- If a new parameter exists:
-- - P is the parameter, and
-- - Tol is the new tolerance.
--   If there is no new parameter this function returns
-- false, and the values of P and Tol are not significant.

	is deferred;
	

    

    Continuity(me: mutable; E          : Edge from TopoDS;
    	                    F1,F2      : Face from TopoDS;
			    NewE       : Edge from TopoDS;
			    NewF1,NewF2: Face from TopoDS)
    
    	returns Shape from GeomAbs
	
	---Purpose: Returns the  continuity of  <NewE> between <NewF1>
	--          and <NewF2>.
	--          <NewE> is the new  edge created from <E>.  <NewF1>
	--          (resp. <NewF2>) is the new  face created from <F1>
	--          (resp. <F2>).

    	is deferred;

end Modification;