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/libs/geometry/test/util/as_range.cpp

https://github.com/delalond/boost_1_54_0-bgq
C++ | 79 lines | 40 code | 21 blank | 18 comment | 2 complexity | c1c6d15751946198bd0ebdfea7890907 MD5 | raw file
 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/util/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
27template <int D, typename Range>
28double 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
39template <typename G>
40void 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::as_range<range_type>(geometry));
51    BOOST_CHECK_CLOSE(s, expected_x, 0.001);
52
53    s = sum<1>(bg::as_range<range_type>(geometry));
54    BOOST_CHECK_CLOSE(s, expected_y, 0.001);
55}
56
57
58template <typename P>
59void 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
74int test_main(int, char* [])
75{
76    test_all<bg::model::point<double, 2, bg::cs::cartesian> >();
77
78    return 0;
79}