38 lines
1.2 KiB
C++
38 lines
1.2 KiB
C++
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// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2016 Qingan Zhou <qnzhou@gmail.com>
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//
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// This Source Code Form is subject to the terms of the Mozilla Public License
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// v. 2.0. If a copy of the MPL was not distributed with this file, You can
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// obtain one at http://mozilla.org/MPL/2.0/.
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#include "orient2D.h"
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#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
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#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
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template<typename Scalar>
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IGL_INLINE short igl::copyleft::cgal::orient2D(
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const Scalar pa[2],
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const Scalar pb[2],
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const Scalar pc[2])
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{
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typedef CGAL::Exact_predicates_exact_constructions_kernel Epeck;
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typedef CGAL::Exact_predicates_inexact_constructions_kernel Epick;
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typedef typename std::conditional<std::is_same<Scalar, Epeck::FT>::value,
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Epeck, Epick>::type Kernel;
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switch(CGAL::orientation(
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typename Kernel::Point_2(pa[0], pa[1]),
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typename Kernel::Point_2(pb[0], pb[1]),
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typename Kernel::Point_2(pc[0], pc[1]))) {
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case CGAL::LEFT_TURN:
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return 1;
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case CGAL::RIGHT_TURN:
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return -1;
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case CGAL::COLLINEAR:
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return 0;
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default:
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throw "Invalid orientation";
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}
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}
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