ceph/src/boost/libs/geometry/test/algorithms/detail/as_range.cpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2 // Unit Test
   3
   4 // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
   5 // Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
   6 // Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
   7
   8 // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
   9 // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
  10
  11 // Use, modification and distribution is subject to the Boost Software License,
  12 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  13 // http://www.boost.org/LICENSE_1_0.txt)
  14
  15
  16 #include <geometry_test_common.hpp>
  17
  18
  19 #include <boost/geometry/views/detail/range_type.hpp>
  20 #include <boost/geometry/algorithms/detail/as_range.hpp>
  21
  22 #include <boost/geometry/core/cs.hpp>
  23 #include <boost/geometry/geometries/geometries.hpp>
  24
  25 #include <boost/geometry/io/wkt/read.hpp>
  26
  27 template <int D, typename Range>
  28 double sum(Range const& range)
  29 {
  30     double s = 0.0;
  31     for (typename boost::range_const_iterator<Range>::type it = boost::begin(range);
  32         it != boost::end(range); ++it)
  33     {
  34         s += bg::get<D>(*it);
  35     }
  36     return s;
  37 }
  38
  39 template <typename G>
  40 void test_geometry(std::string const& wkt, double expected_x, double expected_y)
  41 {
  42     G geometry;
  43
  44     // Declare a range-type, compatible with boost::range,
  45     // such that range_iterator etc could be called
  46     typedef typename bg::detail::range_type<G>::type range_type;
  47
  48     bg::read_wkt(wkt, geometry);
  49
  50     double s = sum<0>(bg::detail::as_range<range_type>(geometry));
  51     BOOST_CHECK_CLOSE(s, expected_x, 0.001);
  52
  53     s = sum<1>(bg::detail::as_range<range_type>(geometry));
  54     BOOST_CHECK_CLOSE(s, expected_y, 0.001);
  55 }
  56
  57
  58 template <typename P>
  59 void test_all()
  60 {
  61     // As-range utility should consider a geometry as a range, so
  62     // linestring stays linestring
  63     test_geometry<bg::model::linestring<P> >("LINESTRING(1 2,3 4)", 4, 6);
  64
  65     // polygon will only be outer-ring
  66     test_geometry<bg::model::polygon<P> >("POLYGON((1 2,3 4))", 4, 6);
  67     test_geometry<bg::model::polygon<P> >("POLYGON((1 2,3 4),(5 6,7 8,9 10))", 4, 6);
  68
  69     // the utility is useful for:
  70     // - convex hull (holes do not count)
  71     // - envelope (idem)
  72 }
  73
  74 int test_main(int, char* [])
  75 {
  76     test_all<bg::model::point<double, 2, bg::cs::cartesian> >();
  77
  78     return 0;
  79 }