Libosmium  2.19.0
Fast and flexible C++ library for working with OpenStreetMap data
rapid_geojson.hpp
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1 #ifndef OSMIUM_GEOM_RAPID_GEOJSON_HPP
2 #define OSMIUM_GEOM_RAPID_GEOJSON_HPP
3 
4 /*
5 
6 This file is part of Osmium (https://osmcode.org/libosmium).
7 
8 Copyright 2013-2023 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 <cstddef>
40 
41 namespace osmium {
42 
43  namespace geom {
44 
45  namespace detail {
46 
54  template <typename TWriter>
55  class RapidGeoJSONFactoryImpl {
56 
57  TWriter* m_writer;
58 
59  public:
60 
61  using point_type = void;
62  using linestring_type = void;
63  using polygon_type = void;
64  using multipolygon_type = void;
65  using ring_type = void;
66 
67  RapidGeoJSONFactoryImpl(int /* srid */, TWriter& writer) :
68  m_writer(&writer) {
69  }
70 
71  /* Point */
72 
73  // { "type": "Point", "coordinates": [100.0, 0.0] }
74  point_type make_point(const osmium::geom::Coordinates& xy) const {
75  m_writer->String("geometry");
76  m_writer->StartObject();
77  m_writer->String("type");
78  m_writer->String("Point");
79  m_writer->String("coordinates");
80  m_writer->StartArray();
81  m_writer->Double(xy.x);
82  m_writer->Double(xy.y);
83  m_writer->EndArray();
84  m_writer->EndObject();
85  }
86 
87  /* LineString */
88 
89  // { "type": "LineString", "coordinates": [ [100.0, 0.0], [101.0, 1.0] ] }
90  void linestring_start() {
91  m_writer->String("geometry");
92  m_writer->StartObject();
93  m_writer->String("type");
94  m_writer->String("LineString");
95  m_writer->String("coordinates");
96  m_writer->StartArray();
97  }
98 
99  void linestring_add_location(const osmium::geom::Coordinates& xy) {
100  m_writer->StartArray();
101  m_writer->Double(xy.x);
102  m_writer->Double(xy.y);
103  m_writer->EndArray();
104  }
105 
106  linestring_type linestring_finish(size_t /* num_points */) {
107  m_writer->EndArray();
108  m_writer->EndObject();
109  }
110 
111  /* Polygon */
112 
113  // { "type": "Polygon", "coordinates": [[[100.0, 0.0], [101.0, 1.0]]] }
114  void polygon_start() {
115  m_writer->String("geometry");
116  m_writer->StartObject();
117  m_writer->String("type");
118  m_writer->String("Polygon");
119  m_writer->String("coordinates");
120  m_writer->StartArray();
121  m_writer->StartArray();
122  }
123 
124  void polygon_add_location(const osmium::geom::Coordinates& xy) {
125  m_writer->StartArray();
126  m_writer->Double(xy.x);
127  m_writer->Double(xy.y);
128  m_writer->EndArray();
129  }
130 
131  polygon_type polygon_finish(size_t /* num_points */) {
132  m_writer->EndArray();
133  m_writer->EndArray();
134  m_writer->EndObject();
135  }
136 
137  /* MultiPolygon */
138 
139  void multipolygon_start() {
140  m_writer->String("geometry");
141  m_writer->StartObject();
142  m_writer->String("type");
143  m_writer->String("MultiPolygon");
144  m_writer->String("coordinates");
145  m_writer->StartArray();
146  }
147 
148  void multipolygon_polygon_start() {
149  m_writer->StartArray();
150  }
151 
152  void multipolygon_polygon_finish() {
153  m_writer->EndArray();
154  }
155 
156  void multipolygon_outer_ring_start() {
157  m_writer->StartArray();
158  }
159 
160  void multipolygon_outer_ring_finish() {
161  m_writer->EndArray();
162  }
163 
164  void multipolygon_inner_ring_start() {
165  m_writer->StartArray();
166  }
167 
168  void multipolygon_inner_ring_finish() {
169  m_writer->EndArray();
170  }
171 
172  void multipolygon_add_location(const osmium::geom::Coordinates& xy) {
173  m_writer->StartArray();
174  m_writer->Double(xy.x);
175  m_writer->Double(xy.y);
176  m_writer->EndArray();
177  }
178 
179  multipolygon_type multipolygon_finish() {
180  m_writer->EndArray();
181  m_writer->EndObject();
182  }
183 
184  }; // class RapidGeoJSONFactoryImpl
185 
186  } // namespace detail
187 
188  template <typename TWriter, typename TProjection = IdentityProjection>
190 
191  } // namespace geom
192 
193 } // namespace osmium
194 
195 #endif // OSMIUM_GEOM_RAPID_GEOJSON_HPP
Definition: factory.hpp:149
Definition: attr.hpp:342
Namespace for everything in the Osmium library.
Definition: assembler.hpp:53
Definition: coordinates.hpp:48
double y
Definition: coordinates.hpp:51
double x
Definition: coordinates.hpp:50