0031682: Visualization - Prs3d_ShadingAspect::SetTransparency() has no effect with...

[occt.git] / src / gce / gce_MakeElips.cxx

// Created on: 1992-09-02
// Created by: Remi GILET
// Copyright (c) 1992-1999 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.


#include <gce_MakeElips.hxx>
#include <gp.hxx>
#include <gp_Ax2.hxx>
#include <gp_Elips.hxx>
#include <gp_Lin.hxx>
#include <gp_Pnt.hxx>
#include <StdFail_NotDone.hxx>

//=========================================================================
//   Creation d une Ellipse 3d de gp a partir de son Ax2 et de son        +
//   grand rayon <MajorRadius> et son petit rayon <MinorRadius>.          +
//=========================================================================
gce_MakeElips::gce_MakeElips(const gp_Ax2&       A2          ,
			     const Standard_Real MajorRadius ,
			     const Standard_Real MinorRadius ) 
{
  if (MajorRadius < MinorRadius ) { TheError = gce_InvertRadius;}
  else if (MinorRadius < 0.0) { TheError = gce_NegativeRadius; }
  else {
    TheElips = gp_Elips(A2,MajorRadius,MinorRadius);
    TheError = gce_Done;
  }

}

//=========================================================================
//   Creation d une Ellipse 3d de gp de centre <Center> et de sommets     +
//   <S1> et <S2>.                                                        +
//   <S1> donne le grand rayon et <S2> le petit rayon.                    +
//=========================================================================

gce_MakeElips::gce_MakeElips(const gp_Pnt&   S1     ,
			     const gp_Pnt&   S2     ,
			     const gp_Pnt&   Center ) 
{
  Standard_Real D1 = S1.Distance(Center);
  if (D1 < gp::Resolution()) { TheError = gce_NullAxis; }
  else {
    gp_Dir XAxis(gp_XYZ(S1.XYZ()-Center.XYZ()));
    Standard_Real D2 = gp_Lin(Center,XAxis).Distance(S2);
    if (D1 < D2 || D2 < gp::Resolution()) { TheError = gce_InvertAxis; }
    else {
      gp_Dir Norm(XAxis.Crossed(gp_Dir(gp_XYZ(S2.XYZ()-Center.XYZ()))));
      TheElips = gp_Elips(gp_Ax2(Center,Norm,XAxis),D1,D2);
      TheError = gce_Done;
    }
  }
}

const gp_Elips& gce_MakeElips::Value() const
{ 
  StdFail_NotDone_Raise_if (TheError != gce_Done,
                            "gce_MakeElips::Value() - no result");
  return TheElips;
}

const gp_Elips& gce_MakeElips::Operator() const 
{
  return Value();
}

gce_MakeElips::operator gp_Elips() const
{
  return Value();
}