-- Created on: 1997-04-14
-- Created by: Christian CAILLET
-- Copyright (c) 1997-1999 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 SelectBasicGeom  from IGESSelect  inherits SelectExplore

    ---Purpose : This selection returns the basic geometric elements
    --           contained in an IGES Entity
    --           Intended to run a "quick" transfer. I.E. :
    --           - for a Group, considers its Elements
    --           - for a Trimmed or Bounded Surface or a Face (BREP),
    --             considers the 3D curves of each of its loops
    --           - for a Plane (108), considers its Bounding Curve
    --           - for a Curve itself, takes it
    --           
    --           Also, FREE surfaces are taken, because curve 3d is known for
    --           them. (the ideal should be to have their natural bounds)
    --           
    --           If <curvesonly> is set, ONLY curves-3d are returned

uses AsciiString from TCollection, Transient, EntityIterator, Graph,
     IGESEntity from IGESData

is

    Create (mode : Integer) returns SelectBasicGeom;
    ---Purpose : Creates a SelectBasicGeom, which allways works recursively
    --           mode = -1 : Returns Surfaces (without trimming)
    --           mode = +1 : Returns Curves 3D (free or bound of surface)
    --           mode = +2 : Returns Basic Curves 3D : as 1 but CompositeCurves
    --                        are returned in detail
    --           mode = 0  : both

    CurvesOnly (me) returns Boolean;

    Explore (me; level : Integer; ent : Transient; G : Graph;
    	     explored : in out EntityIterator)
    	returns Boolean;
    ---Purpose : Explores an entity, to take its contained Curves 3d
    --           Works recursively


    ExploreLabel (me) returns AsciiString from TCollection;
    ---Purpose : Returns a text defining the criterium : "Curves 3d" or
    --           "Basic Geometry"

    SubCurves (myclass; ent : IGESEntity; explored : in out EntityIterator)
    	returns Boolean;
    ---Purpose : This method can be called from everywhere to get the curves
    --           as sub-elements of a given curve :
    --           CompositeCurve : explored lists its subs + returns True
    --           Any Curve : explored is not filled but returned is True
    --           Other : returned is False

fields

    thegeom : Integer;  -- -1 : Surfaces only  1 : Curves 3D only  0 : both

end SelectBasicGeom;