-- Created on: 1995-09-21
-- Created by: Remi LEQUETTE
-- 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 HideData from DBRep 

	---Purpose: This  class stores all the informations concerning
	--          hidden lines on a view.
	--          
	--          * View number
	--          * Matrix of projection
	--          * Type of projection, focal
	--          * Arrays of 3d points
	--          
	--          A drawable shape contains a  list of such  objects
	--          to store  the  hidden lines  for  each view.   The
	--          IsSame method is  used  to check if   hidden lines
	--          must be recompiled.

uses

    Trsf         from gp,
    Display      from Draw,
    Color        from Draw,
    Shape        from TopoDS,
    ListOfBPoint from HLRBRep

is

    Create returns HideData from DBRep;

    Set (me     : in out;
    	 ViewId : Integer from Standard;
         TProj  : Trsf    from gp;
    	 Focal  : Real    from Standard;
         S      : Shape   from TopoDS;
         ang    : Real    from Standard);
	---Purpose: ViewId is the view number
	--          TProj the projection
	--          Focal <= 0 means parallel projection
	--          Alg : the hidden lines
    
    ViewId(me) returns Integer from Standard;
	---C++: inline
	
    Angle(me) returns Real from Standard;
	---C++: inline
	
    IsSame(me; TProj : Trsf from gp; Focla : Real) returns Boolean;
	---Purpose: Returns True if the projection is the same
	
    DrawOn(me                      :in out;
           D                       : in out Display from Draw;
    	   withRg1,withRgN,withHid :        Boolean from Standard;
    	   VisCol, HidCol          :        Color   from Draw);

    LastPick(me) returns Shape from TopoDS;
	---Purpose: Returns the subshape touched by the last pick.
	---C++: return const &

fields
    myView     : Integer      from Standard;
    myTrsf     : Trsf         from gp;
    myFocal    : Real         from Standard;
    myBiPntVis : ListOfBPoint from HLRBRep;
    myBiPntHid : ListOfBPoint from HLRBRep;
    myPickShap : Shape        from TopoDS;
    myAngle    : Real         from Standard;

end HideData;