ceph/src/boost/libs/geometry/doc/src/examples/core/degree_radian.cpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2 // QuickBook Example
   3
   4 // Copyright (c) 2011-2012 Barend Gehrels, Amsterdam, the Netherlands.
   5
   6 // Use, modification and distribution is subject to the Boost Software License,
   7 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   8 // http://www.boost.org/LICENSE_1_0.txt)
   9
  10 //[degree_radian
  11 //` Specify two coordinate systems, one in degrees, one in radians.
  12
  13 #include <iostream>
  14 #include <boost/geometry.hpp>
  15
  16 using namespace boost::geometry;
  17
  18 int main()
  19 {
  20     typedef model::point<double, 2, cs::spherical_equatorial<degree> > degree_point;
  21     typedef model::point<double, 2, cs::spherical_equatorial<radian> > radian_point;
  22
  23     degree_point d(4.893, 52.373);
  24     radian_point r(0.041, 0.8527);
  25
  26     double dist = distance(d, r);
  27     std::cout
  28         << "distance:" << std::endl
  29         << dist << " over unit sphere" << std::endl
  30         << dist * 3959  << " over a spherical earth, in miles" << std::endl;
  31
  32     return 0;
  33 }
  34
  35 //]
  36
  37
  38 //[degree_radian_output
  39 /*`
  40 Output:
  41 [pre
  42 distance:
  43 0.0675272 over unit sphere
  44 267.34 over a spherical earth, in miles
  45 ]
  46 */
  47 //]