// Created on: 1994-09-01
// Created by: Frederic MAUPAS
// 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.

//:o9 abv 19.02.99: bm4_id_punch_b.stp #678: treatment of minR > maxR
//                  NOTE: parametrisation of resulting ellipse shifted on pi/2

#include <StepToGeom_MakeEllipse2d.ixx>
#include <StepGeom_Ellipse.hxx>
#include <StepGeom_Axis2Placement2d.hxx>
#include <Geom2d_AxisPlacement.hxx>
#include <StepToGeom_MakeAxisPlacement.hxx>
#include <gp_Ax2.hxx>
#include <gp_Ax22d.hxx>

//=============================================================================
// Creation d' un Ellipse de Geom2d a partir d' un Ellipse de Step
//=============================================================================

Standard_Boolean StepToGeom_MakeEllipse2d::Convert
    (const Handle(StepGeom_Ellipse)& SC,
     Handle(Geom2d_Ellipse)& CC)
{
  const StepGeom_Axis2Placement AxisSelect = SC->Position();
  if (AxisSelect.CaseNum(AxisSelect.Value()) == 1) {
    Handle(Geom2d_AxisPlacement) A1;
    if (StepToGeom_MakeAxisPlacement::Convert
          (Handle(StepGeom_Axis2Placement2d)::DownCast(AxisSelect.Value()),A1))
    {
      gp_Ax22d A( A1->Ax2d() );
      const Standard_Real majorR = SC->SemiAxis1();
      const Standard_Real minorR = SC->SemiAxis2();
      if ( majorR - minorR >= 0. ) { //:o9 abv 19 Feb 99: bm4_id_punch_b.stp #678: protection
        CC = new Geom2d_Ellipse(A, majorR, minorR);
      }
      else {
        const gp_Dir2d X = A.XDirection();
        A.SetXDirection ( gp_Dir2d ( X.X(), -X.Y() ) );
        CC = new Geom2d_Ellipse(A, minorR, majorR);
      }
      return Standard_True;
	}
  }
  return Standard_False;
}