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// Copyright (c) 2001
// Utrecht University (The Netherlands),
// ETH Zurich (Switzerland),
// INRIA Sophia-Antipolis (France),
// Max-Planck-Institute Saarbruecken (Germany),
// and Tel-Aviv University (Israel). All rights reserved.
//
// This file is part of CGAL (www.cgal.org)
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1/Kernel_d/include/CGAL/Kernel_d/DirectionCd_impl.h $
// $Id: include/CGAL/Kernel_d/DirectionCd_impl.h b26b07a1242 $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s) : Michael Seel <seel@mpi-sb.mpg.de>
#ifndef CGAL_DIRECTIONCD_C
#define CGAL_DIRECTIONCD_C
namespace CGAL {
template <class FT, class LA>
DirectionCd<FT,LA>::DirectionCd(const VectorCd<FT,LA>& v) : Base(v) {}
template <class FT, class LA>
VectorCd<FT,LA> DirectionCd<FT,LA>::vector() const
{ return VectorCd<FT,LA>(*this); }
template <class FT, class LA>
DirectionCd<FT,LA> DirectionCd<FT,LA>::
transform(const Aff_transformationCd<FT,LA>& t) const
{ return vector().transform(t).direction(); }
template <class FT, class LA>
Comparison_result DirectionCd<FT,LA>::
cmp(const DirectionCd<FT,LA>& h1,
const DirectionCd<FT,LA>& h2)
{
if (h1.identical(h2)) return EQUAL;
int i, d = h1.dimension();
for (i = 0; i < d && h1.delta(i)==FT(0) &&
h2.delta(i)==FT(0); ++i) {}
int c1 = CGAL_NTS sign(h1.delta(i));
int c2 = CGAL_NTS sign(h2.delta(i));
if (c1 != c2) return CGAL_NTS compare(c1,c2);
FT s1 = (FT) (int) CGAL_NTS sign(h2.delta(i)) * h2.delta(i);
FT s2 = (FT) (int) CGAL_NTS sign(h1.delta(i)) * h1.delta(i);
i++;
Comparison_result c;
while (i < d) {
c = CGAL_NTS compare(s1 * h1.delta(i), s2 * h2.delta(i));
if (c != EQUAL) return c;
i++;
}
return EQUAL;
}
template <class FT, class LA>
std::istream& operator>>(std::istream& I, DirectionCd<FT,LA>& dir)
{ dir.copy_on_write(); dir.ptr()->read(I);
return I;
}
template <class FT, class LA>
std::ostream& operator<<(std::ostream& O, const DirectionCd<FT,LA>& dir)
{ dir.ptr()->print(O,"DirectionCd"); return O; }
} //namespace CGAL
#endif // CGAL_DIRECTIONCD_C
//----------------------- end of file ----------------------------------
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