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  • Committer: Package Import Robot
  • Author(s): Steve M. Robbins
  • Date: 2012-02-26 00:31:44 UTC
  • Revision ID: package-import@ubuntu.com-20120226003144-eaytp12cbf6ubpms
Tags: upstream-1.49.0
Import upstream version 1.49.0

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libs/geometry/doc/src/examples/geometries/register/point.cpp
 
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// 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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//[register_point_2d
 
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//` Show the use of the macro BOOST_GEOMETRY_REGISTER_POINT_2D
 
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#include <iostream>
 
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#include <boost/geometry.hpp>
 
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#include <boost/geometry/geometries/register/point.hpp>
 
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/*< Somewhere, any legacy point struct is defined >*/
 
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struct legacy_point
 
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{
 
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    double x, y;
 
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};
 
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BOOST_GEOMETRY_REGISTER_POINT_2D(legacy_point, double, cs::cartesian, x, y) /*< The magic: adapt it to Boost.Geometry Point Concept >*/
 
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int main()
 
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{
 
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    legacy_point p1, p2;
 
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    namespace bg = boost::geometry;
 
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    /*< Any Boost.Geometry function can be used for legacy point now. Here: assign_values and distance >*/
 
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    bg::assign_values(p1, 1, 1);
 
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    bg::assign_values(p2, 2, 2);
 
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    double d = bg::distance(p1, p2);
 
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    std::cout << "Distance: " << d << std::endl;
 
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    return 0;
 
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}
 
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//]
 
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//[register_point_2d_output
 
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/*`
 
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Output:
 
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[pre
 
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Distance: 1.41421
 
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]
 
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*/
 
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//]