63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
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// Copyright (c) 2006-2009 Max-Planck-Institute Saarbruecken (Germany).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org)
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/shear.h $
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// $Id: shear.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
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// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
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//
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//
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// Author(s) : Michael Kerber <mkerber@mpi-inf.mpg.de>
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//
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// ============================================================================
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#ifndef CGAL_ACK_SHEAR_H
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#define CGAL_ACK_SHEAR_H 1
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#include <CGAL/basic.h>
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#include <CGAL/Polynomial_traits_d.h>
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#include <utility>
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#include <vector>
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#include <functional>
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#include <iterator>
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#include <CGAL/boost/iterator/transform_iterator.hpp>
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#include <CGAL/boost/iterator/counting_iterator.hpp>
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namespace CGAL {
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namespace internal {
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/*! \ingroup NiX_bivariate_polynomial_hacks
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* \brief Computes the polynomial f(x+sy,y)
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*/
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template<class NT>
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CGAL::Polynomial<CGAL::Polynomial<NT> >
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shear(const CGAL::Polynomial<CGAL::Polynomial<NT> >& f,NT s) {
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typedef CGAL::Polynomial<NT> Poly_1;
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typedef CGAL::Polynomial<Poly_1> Poly_2;
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Poly_1 x(NT(0),NT(1));
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Poly_1 zero(NT(0));
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Poly_1 one(NT(1));
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Poly_2 for_x(x,Poly_1(NT(s)));
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Poly_2 for_y(zero,one);
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std::vector<Poly_2> coeffs;
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coeffs.push_back(for_x);
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coeffs.push_back(for_y);
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return typename CGAL::Polynomial_traits_d<Poly_2>::Substitute()
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(f,coeffs.begin(), coeffs.end());
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}
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} // namespace internal
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} //namespace CGAL
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#endif // NiX_BIVARIATE_POLYNOMIAL_HACKS_H
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// EOF
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