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// Boost.Geometry
// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
// This file was modified by Oracle on 2014.
// Modifications copyright (c) 2014 Oracle and/or its affiliates.
// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
// Use, modification and distribution is subject to the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_GEOMETRY_STRATEGIES_AGNOSTIC_SIDE_BY_AZIMUTH_HPP
#define BOOST_GEOMETRY_STRATEGIES_AGNOSTIC_SIDE_BY_AZIMUTH_HPP
#include <boost/mpl/if.hpp>
#include <boost/type_traits.hpp>
#include <boost/core/ignore_unused.hpp>
#include <boost/geometry/core/cs.hpp>
#include <boost/geometry/core/access.hpp>
#include <boost/geometry/core/radian_access.hpp>
#include <boost/geometry/algorithms/detail/azimuth.hpp>
#include <boost/geometry/util/math.hpp>
#include <boost/geometry/util/promote_floating_point.hpp>
#include <boost/geometry/util/select_calculation_type.hpp>
#include <boost/geometry/strategies/side.hpp>
//#include <boost/geometry/strategies/concepts/side_concept.hpp>
namespace boost { namespace geometry
{
namespace strategy { namespace side
{
/*!
\brief Check at which side of a segment a point lies
left of segment (> 0), right of segment (< 0), on segment (0)
\ingroup strategies
\tparam Model Reference model of coordinate system.
\tparam CalculationType \tparam_calculation
*/
template <typename Model, typename CalculationType = void>
class side_by_azimuth
{
public:
side_by_azimuth(Model const& model = Model())
: m_model(model)
{}
template <typename P1, typename P2, typename P>
inline int apply(P1 const& p1, P2 const& p2, P const& p)
{
typedef typename promote_floating_point
<
typename select_calculation_type_alt
<
CalculationType,
P1, P2, P
>::type
>::type calc_t;
calc_t d1 = 0.001;
calc_t crs_AD = geometry::detail::azimuth<calc_t>(p1, p, m_model);
calc_t crs_AB = geometry::detail::azimuth<calc_t>(p1, p2, m_model);
calc_t XTD = asin(sin(d1) * sin(crs_AD - crs_AB));
return math::equals(XTD, 0) ? 0 : XTD < 0 ? 1 : -1;
}
private:
Model m_model;
};
}} // namespace strategy::side
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_STRATEGIES_AGNOSTIC_SIDE_BY_AZIMUTH_HPP
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