Libosmium  2.17.3
Fast and flexible C++ library for working with OpenStreetMap data
wkt.hpp
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1 #ifndef OSMIUM_GEOM_WKT_HPP
2 #define OSMIUM_GEOM_WKT_HPP
3 
4 /*
5 
6 This file is part of Osmium (https://osmcode.org/libosmium).
7 
8 Copyright 2013-2022 Jochen Topf <jochen@topf.org> and others (see README).
9 
10 Boost Software License - Version 1.0 - August 17th, 2003
11 
12 Permission is hereby granted, free of charge, to any person or organization
13 obtaining a copy of the software and accompanying documentation covered by
14 this license (the "Software") to use, reproduce, display, distribute,
15 execute, and transmit the Software, and to prepare derivative works of the
16 Software, and to permit third-parties to whom the Software is furnished to
17 do so, all subject to the following:
18 
19 The copyright notices in the Software and this entire statement, including
20 the above license grant, this restriction and the following disclaimer,
21 must be included in all copies of the Software, in whole or in part, and
22 all derivative works of the Software, unless such copies or derivative
23 works are solely in the form of machine-executable object code generated by
24 a source language processor.
25 
26 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
27 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
28 FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
29 SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
30 FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
31 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
32 DEALINGS IN THE SOFTWARE.
33 
34 */
35 
37 #include <osmium/geom/factory.hpp>
38 
39 #include <cassert>
40 #include <cstddef>
41 #include <string>
42 #include <utility>
43 
44 namespace osmium {
45 
46  namespace geom {
47 
48  enum class wkt_type : bool {
49  wkt = false,
50  ewkt = true
51  }; // enum class wkt_type
52 
53  namespace detail {
54 
55  class WKTFactoryImpl {
56 
57  std::string m_srid_prefix;
58  std::string m_str;
59  int m_precision;
60  wkt_type m_wkt_type;
61 
62  public:
63 
64  using point_type = std::string;
65  using linestring_type = std::string;
66  using polygon_type = std::string;
67  using multipolygon_type = std::string;
68  using ring_type = std::string;
69 
70  explicit WKTFactoryImpl(int srid, int precision = 7, wkt_type wtype = wkt_type::wkt) :
71  m_precision(precision),
72  m_wkt_type(wtype) {
73  if (m_wkt_type == wkt_type::ewkt) {
74  m_srid_prefix = "SRID=";
75  m_srid_prefix += std::to_string(srid);
76  m_srid_prefix += ';';
77  }
78  }
79 
80  /* Point */
81 
82  point_type make_point(const osmium::geom::Coordinates& xy) const {
83  std::string str{m_srid_prefix};
84  str += "POINT";
85  xy.append_to_string(str, '(', ' ', ')', m_precision);
86  return str;
87  }
88 
89  /* LineString */
90 
91  void linestring_start() {
92  m_str = m_srid_prefix;
93  m_str += "LINESTRING(";
94  }
95 
96  void linestring_add_location(const osmium::geom::Coordinates& xy) {
97  xy.append_to_string(m_str, ' ', m_precision);
98  m_str += ',';
99  }
100 
101  linestring_type linestring_finish(size_t /* num_points */) {
102  assert(!m_str.empty());
103  std::string str;
104 
105  using std::swap;
106  swap(str, m_str);
107 
108  str.back() = ')';
109  return str;
110  }
111 
112  /* Polygon */
113  void polygon_start() {
114  m_str = m_srid_prefix;
115  m_str += "POLYGON((";
116  }
117 
118  void polygon_add_location(const osmium::geom::Coordinates& xy) {
119  xy.append_to_string(m_str, ' ', m_precision);
120  m_str += ',';
121  }
122 
123  polygon_type polygon_finish(size_t /* num_points */) {
124  assert(!m_str.empty());
125  std::string str;
126 
127  using std::swap;
128  swap(str, m_str);
129 
130  str.back() = ')';
131  str += ")";
132  return str;
133  }
134 
135  /* MultiPolygon */
136 
137  void multipolygon_start() {
138  m_str = m_srid_prefix;
139  m_str += "MULTIPOLYGON(";
140  }
141 
142  void multipolygon_polygon_start() {
143  m_str += '(';
144  }
145 
146  void multipolygon_polygon_finish() {
147  m_str += "),";
148  }
149 
150  void multipolygon_outer_ring_start() {
151  m_str += '(';
152  }
153 
154  void multipolygon_outer_ring_finish() {
155  assert(!m_str.empty());
156  m_str.back() = ')';
157  }
158 
159  void multipolygon_inner_ring_start() {
160  m_str += ",(";
161  }
162 
163  void multipolygon_inner_ring_finish() {
164  assert(!m_str.empty());
165  m_str.back() = ')';
166  }
167 
168  void multipolygon_add_location(const osmium::geom::Coordinates& xy) {
169  xy.append_to_string(m_str, ' ', m_precision);
170  m_str += ',';
171  }
172 
173  multipolygon_type multipolygon_finish() {
174  assert(!m_str.empty());
175  std::string str;
176 
177  using std::swap;
178  swap(str, m_str);
179 
180  str.back() = ')';
181  return str;
182  }
183 
184  }; // class WKTFactoryImpl
185 
186  } // namespace detail
187 
188  template <typename TProjection = IdentityProjection>
190 
191  } // namespace geom
192 
193 } // namespace osmium
194 
195 #endif // OSMIUM_GEOM_WKT_HPP
Definition: factory.hpp:149
Definition: attr.hpp:342
wkt_type
Definition: wkt.hpp:48
Namespace for everything in the Osmium library.
Definition: assembler.hpp:53
Definition: coordinates.hpp:48
void append_to_string(std::string &s, const char infix, int precision) const
Definition: coordinates.hpp:100