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// Copyright (c) 2001 Utrecht University (The Netherlands),
// ETH Zurich (Switzerland), Freie Universitaet Berlin (Germany),
// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
// and Tel-Aviv University (Israel). All rights reserved.
//
// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; version 2.1 of the License.
// See the file LICENSE.LGPL distributed with CGAL.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL: svn+ssh://scm.gforge.inria.fr/svn/cgal/branches/CGAL-3.5-branch/Kernel_d/include/CGAL/Kernel_d/DirectionCd_impl.h $
// $Id: DirectionCd_impl.h 41339 2007-12-27 16:15:21Z spion $
//
//
// Author(s) : Michael Seel <seel@mpi-sb.mpg.de>
#ifndef CGAL_DIRECTIONCD_C
#define CGAL_DIRECTIONCD_C
CGAL_BEGIN_NAMESPACE
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) CGAL_NTS sign(h2.delta(i)) * h2.delta(i);
FT s2 = (FT) 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; }
CGAL_END_NAMESPACE
#endif // CGAL_DIRECTIONCD_C
//----------------------- end of file ----------------------------------
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