libs/geometry/test/algorithms/test_area.hpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2 // Unit Test
   3
   4 // Copyright (c) 2007-2012 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 #ifndef BOOST_GEOMETRY_TEST_AREA_HPP
  11 #define BOOST_GEOMETRY_TEST_AREA_HPP
  12
  13
  14 #include <geometry_test_common.hpp>
  15
  16 #include <boost/geometry/algorithms/area.hpp>
  17 #include <boost/geometry/algorithms/correct.hpp>
  18 #include <boost/geometry/strategies/strategies.hpp>
  19
  20 #include <boost/geometry/io/wkt/read.hpp>
  21
  22
  23 template <typename Geometry>
  24 void test_area(Geometry const& geometry,
  25             typename bg::default_area_result<Geometry>::type expected_area)
  26 {
  27     typename bg::default_area_result<Geometry>::type area = bg::area(geometry);
  28
  29 #ifdef BOOST_GEOMETRY_TEST_DEBUG
  30     std::ostringstream out;
  31     out << typeid(typename bg::coordinate_type<Geometry>::type).name()
  32         << " "
  33         << typeid(typename bg::default_area_result<Geometry>::type).name()
  34         << " "
  35         << "area : " << bg::area(geometry)
  36         << std::endl;
  37     std::cout << out.str();
  38 #endif
  39
  40     BOOST_CHECK_CLOSE(area, expected_area, 0.0001);
  41
  42     // Test with explicitly defined strategies
  43     bg::strategy::area::surveyor
  44         <
  45             typename bg::point_type<Geometry>::type
  46         > strategy1;
  47
  48     area = bg::area(geometry, strategy1);
  49
  50     bg::strategy::area::surveyor
  51         <
  52             typename bg::point_type<Geometry>::type,
  53             typename bg::coordinate_type<Geometry>::type
  54         > strategy2;
  55
  56     area = bg::area(geometry, strategy2);
  57
  58 }
  59
  60 template <typename Geometry>
  61 void test_geometry(std::string const& wkt,
  62             typename bg::default_area_result<Geometry>::type expected_area)
  63 {
  64     Geometry geometry;
  65     bg::read_wkt(wkt, geometry);
  66     test_area(geometry, expected_area);
  67 }
  68
  69 template <typename Geometry>
  70 void test_empty_input(Geometry const& geometry)
  71 {
  72     try
  73     {
  74         bg::area(geometry);
  75     }
  76     catch(bg::empty_input_exception const& )
  77     {
  78         return;
  79     }
  80     BOOST_CHECK_MESSAGE(false, "A empty_input_exception should have been thrown" );
  81 }
  82
  83
  84 #endif