[/============================================================================
  Boost.Geometry (aka GGL, Generic Geometry Library)

  Copyright (c) 2007-2013 Barend Gehrels, Amsterdam, the Netherlands.
  Copyright (c) 2008-2013 Bruno Lalande, Paris, France.
  Copyright (c) 2009-2013 Mateusz Loskot, London, UK.

  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)
=============================================================================/]


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[section:strategy_distance_cross_track strategy::distance::cross_track]

'''<indexterm><primary>strategy</primary></indexterm><indexterm><primary>distance</primary></indexterm><indexterm><primary>cross_track</primary></indexterm>'''
Strategy functor for distance point to segment calculation. 

[heading Description]
Class which calculates the distance of a point to a segment, for points on a sphere or globe 

[heading Synopsis]
``template<typename CalculationType, typename Strategy>
class strategy::distance::cross_track
{
  // ...
};
``

[heading Template parameter(s)]
[table
[[Parameter] [Default] [Description]]
[[typename CalculationType] [void] [numeric type for calculation (e.g. high precision); if [*void] then it is extracted automatically from the coordinate type and (if necessary) promoted to floating point ]]
[[typename Strategy] [haversine<double, CalculationType>] [underlying point-point distance strategy, defaults to haversine]]
]

[heading Constructor(s)]
[table
[[Function] [Description] [Parameters] ]
[[``cross_track()``

] [] [

]]
[[``cross_track(typename Strategy::radius_type const & r)``

] [] [[* typename Strategy::radius_type const &]: ['r]:  



]]
[[``cross_track(Strategy const & s)``

] [] [[* Strategy const &]: ['s]:  



]]
]

[heading Member Function(s)]
[table
[[Function] [Description] [Parameters]  [Returns]]
[[``template<typename Point, typename PointOfSegment>
auto apply(Point const & p, PointOfSegment const & sp1, PointOfSegment const & sp2)``

] [] [[* Point const &]: ['p]:  

[* PointOfSegment const &]: ['sp1]:  

[* PointOfSegment const &]: ['sp2]:  



][

]
]
[[``template<typename T1, typename T2>
radius_type vertical_or_meridian(T1 lat1, T2 lat2)``

] [] [[* T1]: ['lat1]:  

[* T2]: ['lat2]:  



][

]
]
[[``Strategy::radius_type radius()``

] [] [

][

]
]
]

[heading Header]
`#include <boost/geometry/strategies/spherical/distance_cross_track.hpp>`

[heading See also]
[link geometry.reference.algorithms.distance.distance_3_with_strategy distance (with strategy)]

[endsect]

