1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
// Copyright (c) 2018, 2025, Oracle and/or its affiliates.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License, version 2.0,
// as published by the Free Software Foundation.
//
// This program is designed to work with certain software (including
// but not limited to OpenSSL) that is licensed under separate terms,
// as designated in a particular file or component or in included license
// documentation. The authors of MySQL hereby grant you an additional
// permission to link the program and your derivative works with the
// separately licensed software that they have either included with
// the program or referenced in the documentation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License, version 2.0, for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
/// @file
///
/// This file implements the simplify functor and function.
#include "sql/gis/simplify.h"
#include "sql/gis/simplify_functor.h"
#include <assert.h>
#include <memory> // std::unique_ptr
#include <boost/geometry.hpp>
// assert
#include "my_inttypes.h" // MYF
#include "my_sys.h" // my_error
#include "mysqld_error.h" // Error codes
#include "sql/dd/types/spatial_reference_system.h" // dd::Spatial_reference_system
#include "sql/gis/geometries.h"
#include "sql/gis/geometries_traits.h"
#include "sql/sql_exception_handler.h" // handle_gis_exception
namespace bg = boost::geometry;
namespace gis {
std::unique_ptr<Geometry> Simplify::operator()(const Geometry &g) const {
return apply(*this, g);
}
std::unique_ptr<Geometry> Simplify::eval(const Geometry &g) const {
// All parameter type combinations have been implemented.
assert(false);
throw not_implemented_exception::for_non_projected(g);
}
std::unique_ptr<Geometry> Simplify::eval(const Cartesian_point &g) const {
Cartesian_point *pt_result = new Cartesian_point();
std::unique_ptr<Geometry> result(pt_result);
bg::simplify(g, *pt_result, m_max_distance);
return result;
}
std::unique_ptr<Geometry> Simplify::eval(const Cartesian_linestring &g) const {
Cartesian_linestring *ls_result = new Cartesian_linestring();
std::unique_ptr<Geometry> result(ls_result);
bg::simplify(g, *ls_result, m_max_distance);
if (ls_result->size() < 2) ls_result->clear();
return result;
}
std::unique_ptr<Geometry> Simplify::eval(const Cartesian_polygon &g) const {
Cartesian_polygon *py_result = new Cartesian_polygon();
std::unique_ptr<Geometry> result(py_result);
bg::simplify(g, *py_result, m_max_distance);
if (py_result->exterior_ring().size() < 4)
result.reset(new Cartesian_polygon());
return result;
}
std::unique_ptr<Geometry> Simplify::eval(
const Cartesian_geometrycollection &g) const {
Cartesian_geometrycollection *gc_result = new Cartesian_geometrycollection();
std::unique_ptr<Geometry> result(gc_result);
for (Geometry *geom : g) {
std::unique_ptr<Geometry> simplified_geom = (*this)(*geom);
if (!simplified_geom->is_empty()) gc_result->push_back(*simplified_geom);
}
return result;
}
std::unique_ptr<Geometry> Simplify::eval(const Cartesian_multipoint &g) const {
Cartesian_multipoint *mpt_result = new Cartesian_multipoint();
std::unique_ptr<Geometry> result(mpt_result);
bg::simplify(g, *mpt_result, m_max_distance);
return result;
}
std::unique_ptr<Geometry> Simplify::eval(
const Cartesian_multilinestring &g) const {
std::unique_ptr<Cartesian_multilinestring> unfiltered_result(
new Cartesian_multilinestring());
bg::simplify(g, *unfiltered_result, m_max_distance);
// bg::simplify may create geometries with too few points. Filter out those.
Cartesian_multilinestring *mls_result = new Cartesian_multilinestring();
std::unique_ptr<Geometry> result(mls_result);
for (Cartesian_linestring &ls : *unfiltered_result) {
if (ls.size() >= 2) mls_result->push_back(ls);
}
return result;
}
std::unique_ptr<Geometry> Simplify::eval(
const Cartesian_multipolygon &g) const {
std::unique_ptr<Cartesian_multipolygon> unfiltered_result(
new Cartesian_multipolygon());
bg::simplify(g, *unfiltered_result, m_max_distance);
// bg::simplify may create geometries with too few points. Filter out those.
Cartesian_multipolygon *mpy_result = new Cartesian_multipolygon();
std::unique_ptr<Geometry> result(mpy_result);
for (Cartesian_polygon &py : *unfiltered_result) {
if (py.exterior_ring().size() >= 4) mpy_result->push_back(py);
}
return result;
}
bool simplify(const dd::Spatial_reference_system *srs, const Geometry &g,
double max_distance, const char *func_name,
std::unique_ptr<Geometry> *result) noexcept {
try {
assert(srs == nullptr ||
((srs->is_cartesian() &&
g.coordinate_system() == Coordinate_system::kCartesian) ||
(srs->is_geographic() &&
g.coordinate_system() == Coordinate_system::kGeographic)));
if (srs != nullptr && !srs->is_cartesian()) {
assert(srs->is_geographic());
std::stringstream types;
types << type_to_name(g.type()) << ", ...";
my_error(ER_NOT_IMPLEMENTED_FOR_GEOGRAPHIC_SRS, MYF(0), func_name,
types.str().c_str());
return true;
}
Simplify simplify_func(max_distance);
*result = simplify_func(g);
if ((*result)->is_empty()) result->reset();
} catch (...) {
handle_gis_exception(func_name);
return true;
}
return false;
}
} // namespace gis
|
