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44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// QuickBook Example
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// Copyright (c) 2011-2012 Barend Gehrels, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//[length_with_strategy
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//`The following example shows the length measured over a sphere, expressed in kilometers. To do that the radius of the sphere must be specified in the constructor of the strategy.
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#include <iostream>
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#include <boost/geometry.hpp>
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#include <boost/geometry/geometries/linestring.hpp>
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int main()
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{
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using namespace boost::geometry;
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typedef model::point<float, 2, cs::spherical_equatorial<degree> > P;
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model::linestring<P> line;
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line.push_back(P(2, 41));
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line.push_back(P(2, 48));
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line.push_back(P(5, 52));
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double const mean_radius = 6371.0; /*< [@http://en.wikipedia.org/wiki/Earth_radius Wiki] >*/
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std::cout << "length is "
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<< length(line, strategy::distance::haversine<float>(mean_radius) )
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<< " kilometers " << std::endl;
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return 0;
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}
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//]
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//[length_with_strategy_output
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/*`
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Output:
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[pre
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length is 1272.03 kilometers
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]
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*/
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//]
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