//===========================================================================
// Copyright (C) 1998, 2000-2007, 2010, 2011, 2012 SINTEF ICT, Applied
// Mathematics, Norway.
//
// This file is part of GoTools
//
// This program is free software; you can redistribute it and/or          
// modify it under the terms of the GNU General Public License            
// as published by the Free Software Foundation version 2 of the License. 
//
// This program is distributed in the hope that it will be useful,        
// but WITHOUT ANY WARRANTY; without even the implied warranty of         
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          
// GNU General Public License for more details.                           
//
// You should have received a copy of the GNU General Public License      
// along with this program; if not, see <http://www.gnu.org/licenses>
//
// Contact information: E-mail: tor.dokken@sintef.no                      
// SINTEF ICT, Department of Applied Mathematics,                         
// P.O. Box 124 Blindern,                                                 
// 0314 Oslo, Norway.                                                     
//
// Other licenses are also available for this software, notably licenses
// for:
// - Building commercial software.                                        
// - Building software whose source code you wish to keep private.        
//===========================================================================

#ifndef _SINGULAR_H
#define _SINGULAR_H

#include "GoTools/utils/Point.h"
#include <vector>
#include <memory>

namespace Go {

/// Compute vanishing curve tangents and surface normals

    class ParamSurface;
    class ParamCurve;

namespace Singular
{

    void vanishingNormal(shared_ptr<ParamSurface> srf, double tol,
			 std::vector<Point>& singular_pts,  // Singular points in the parameter domain 
			 std::vector<std::vector<Point> >& singular_sequences);  // Sequences of parameter points
                                                                        	// making a singular curve

    void vanishingTangent(shared_ptr<ParamCurve> crv, 
			  double start, double end, double tol,
			 std::vector<double>& singular_pts,  // Singular points in the parameter domain 
			 std::vector<std::vector<double> >& singular_sequences);  // Sequences of parameter points
                                                                        	// making a singular curve

} // of namespace Singular

} // end namespace Go



#endif // _SINGULAR_H
