-- Created on: 1995-04-19
-- Created by: Yves FRICAUD
-- Copyright (c) 1995-1999 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.

class OffsetWire from BRepFill

	---Purpose: Constructs a Offset Wire to a spine (wire or face) 
	--          on the left of spine.

uses

    Face        from TopoDS,
    Shape       from TopoDS,
    JoinType    from GeomAbs,
    ListOfShape from TopTools,
    DataMapOfShapeShape               from TopTools,
    IndexedDataMapOfOrientedShapeListOfShape from BRepFill,  
    BisectingLocus                    from BRepMAT2d, 
    LinkTopoBilo                      from BRepMAT2d
    
raises
    ConstructionError from Standard,
    NoSuchObject      from Standard

is

    Create returns OffsetWire from BRepFill;

    Create ( Spine : Face     from TopoDS; 
    	     Join  : JoinType from GeomAbs  =  GeomAbs_Arc)
    returns OffsetWire from BRepFill;

    Init ( me    : in out;
    	   Spine : Face     from TopoDS; 
    	   Join  : JoinType from GeomAbs  =  GeomAbs_Arc)
	---Purpose: Initialize the evaluation of Offseting.
    raises
    	ConstructionError from Standard
    is static;
    
    Perform (me : in out; 
    	     Offset : Real from Standard;
    	     Alt    : Real from Standard = 0.0)
	---Purpose: Performs  an OffsetWire at  an altitude <Alt> from
	--          the  face ( According  to  the orientation of  the
	--          face)
    raises
    	ConstructionError from Standard
    is static;
    
    PerformWithBiLo (me      : in out; 
    	    	     WSP     :        Face            from TopoDS;
    	     	     Offset  :        Real            from Standard;
 		     Locus   :        BisectingLocus  from BRepMAT2d; 
		     Link    : in out LinkTopoBilo    from BRepMAT2d; 
    	             Join    :        JoinType  from GeomAbs  =  GeomAbs_Arc; 
    	    	     Alt     :        Real      from Standard = 0.0)
	---Purpose: Performs an  OffsetWire 
    raises
    	ConstructionError from Standard
    is static;
    
    IsDone ( me) 
    returns Boolean from Standard
    is static;

    Spine(me) 
    returns Face from TopoDS
	---C++: return const &
    is static;


    Shape(me) returns Shape from TopoDS
	---Purpose: returns the generated shape.
	---C++ : return const &
    is static;
    
    GeneratedShapes (me : in out ; SpineShape : Shape from TopoDS)
        ---Purpose: Returns   the  shapes  created  from   a  subshape
        --          <SpineShape> of the spine.
        --          Returns the last computed Offset.   
        --          
        ---C++ : return const &          
    returns ListOfShape from TopTools
    is static;			 

    JoinType (me) returns JoinType from GeomAbs
    is static;
    
    Generated (me : in out )
    	---C++: return &
    returns IndexedDataMapOfOrientedShapeListOfShape from BRepFill
    is static private;
    
    PrepareSpine (me : in out)
	---Purpose: Prepare the spine as follow
	--          - Cut the spine-Edges at the extrema of curvature and
	--            at the inflexion points.
    is static private;

    Add(me : in out; Other : OffsetWire from BRepFill)
	---Purpose: Add the OffsetWire <Other> to <me> and update <myMap>
    is static private;
    
    MakeWires (me : in  out)
	---Purpose: Constructs the wires with the trimmed offset edges.
    is static private;
    
    FixHoles (me : in  out)
	---Purpose: Fix holes between open wires where it is possible
    is static private; 
    
fields

    mySpine     : Face      from TopoDS;
    myWorkSpine : Face      from TopoDS;
    myOffset    : Real      from Standard; -- >0 ;
    myShape     : Shape     from TopoDS;
    myIsDone    : Boolean   from Standard;
    myJoinType  : JoinType  from GeomAbs;	    
    myMap       : IndexedDataMapOfOrientedShapeListOfShape from BRepFill; 
    myBilo      : BisectingLocus                    from BRepMAT2d;
    myLink      : LinkTopoBilo                      from BRepMAT2d;
    myMapSpine  : DataMapOfShapeShape               from TopTools;
    myCallGen   : Boolean                           from Standard;	    

end OffsetWire;