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Merge pull request #4432 from mapnik/geojson-empty-geometries

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Geojson - empty positions arrays handling
This commit is contained in:
Artem Pavlenko 2024-02-27 09:04:24 +00:00 committed by GitHub
commit 34c95df267
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GPG key ID: B5690EEEBB952194
5 changed files with 102 additions and 16 deletions
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31
include/mapnik/geometry/is_empty.hpp
View file

@ -39,18 +39,39 @@ struct geometry_is_empty
bool operator()(mapnik::geometry::point<double> const&) const { return false; }
bool operator()(mapnik::geometry::line_string<double> const& geom) const { return geom.empty(); }
bool operator()(mapnik::geometry::line_string<double> const& line) const { return line.empty(); }
bool operator()(mapnik::geometry::polygon<double> const& geom) const
bool operator()(mapnik::geometry::polygon<double> const& poly) const
{
return geom.empty() || geom.front().empty();
for (auto const& ring : poly)
{
if (!ring.empty())
return false;
}
return true;
}
bool operator()(mapnik::geometry::multi_point<double> const& geom) const { return geom.empty(); }
bool operator()(mapnik::geometry::multi_line_string<double> const& geom) const { return geom.empty(); }
bool operator()(mapnik::geometry::multi_line_string<double> const& mline) const
{
for (auto const& line : mline)
{
if (!line.empty())
return false;
}
return true;
}
bool operator()(mapnik::geometry::multi_polygon<double> const& geom) const { return geom.empty(); }
bool operator()(mapnik::geometry::multi_polygon<double> const& mpoly) const
{
for (auto const& poly : mpoly)
{
if (!operator()(poly))
return false;
}
return true;
}
bool operator()(mapnik::geometry::geometry_collection<double> const& geom) const { return geom.empty(); }

37
include/mapnik/json/create_geometry.hpp
View file

@ -64,6 +64,11 @@ struct create_linestring
{
mapnik::geometry::line_string<double> line;
std::size_t size = points.size();
// if (size < 2)
//{
// throw std::runtime_error("RFC 7946: For type \"LineString\", the \"coordinates\" member is an array of
// two or more positions.");
// }
line.reserve(size);
for (auto&& pt : points)
{
@ -108,6 +113,12 @@ struct create_polygon
mapnik::geometry::correct(geom_);
}
void operator()(ring const& points) const
{
// POLYGON EMPTY
geom_ = std::move(mapnik::geometry::polygon<double>{});
}
template<typename T>
void operator()(T const&) const
{
@ -170,6 +181,12 @@ struct create_multilinestring
geom_ = std::move(multi_line);
}
void operator()(ring const& points) const
{
// MULTILINESTRING EMPTY
geom_ = std::move(mapnik::geometry::multi_line_string<double>{});
}
template<typename T>
void operator()(T const&) const
{
@ -213,6 +230,26 @@ struct create_multipolygon
mapnik::geometry::correct(geom_);
}
void operator()(rings const& rngs) const
{
// MULTIPOLYGON
mapnik::geometry::multi_polygon<double> multi_poly;
mapnik::geometry::polygon<double> poly;
std::size_t num_rings = rngs.size();
for (std::size_t i = 0; i < num_rings; ++i)
{
// POLYGON EMPTY
multi_poly.emplace_back(mapnik::geometry::polygon<double>{});
}
geom_ = std::move(multi_poly);
}
void operator()(ring const& points) const
{
// MULTIPOLYGON EMPTY
geom_ = std::move(mapnik::geometry::multi_polygon<double>{});
}
template<typename T>
void operator()(T const&) const
{

6
include/mapnik/json/geometry_generator_grammar_impl.hpp
View file

@ -83,16 +83,16 @@ geometry_generator_grammar<OutputIterator, Geometry>::geometry_generator_grammar
linear_ring_coord = lit('[') << -(point_coord % lit(',')) << lit(']')//linestring_coord.alias()
;
polygon_coord = lit('[') << linear_ring_coord % lit(',') << lit(']')
polygon_coord = lit('[') << -(linear_ring_coord % lit(',')) << lit(']')
;
multi_point_coord = lit('[') << -(point_coord % lit(',')) << lit(']');//linestring_coord.alias()
;
multi_linestring_coord = lit('[') << linestring_coord % lit(',') << lit(']')
multi_linestring_coord = lit('[') << -(linestring_coord % lit(',')) << lit(']')
;
multi_polygon_coord = lit('[') << polygon_coord % lit(',') << lit("]")
multi_polygon_coord = lit('[') << -(polygon_coord % lit(',')) << lit("]")
;
geometries = geometry % lit(',')

6
test/unit/datasource/geojson.cpp
View file

@ -28,6 +28,7 @@
#include <mapnik/datasource_cache.hpp>
#include <mapnik/geometry.hpp>
#include <mapnik/geometry/geometry_type.hpp>
#include <mapnik/geometry/is_empty.hpp>
#include <mapnik/json/geometry_parser.hpp>
#include <mapnik/util/geometry_to_geojson.hpp>
#include <mapnik/util/fs.hpp>
@ -126,9 +127,13 @@ TEST_CASE("geojson")
{
auto valid_empty_geometries = {"null", // Point can't be empty
"{ \"type\": \"LineString\", \"coordinates\":[]}",
"{ \"type\": \"Polygon\", \"coordinates\":[]} ",
"{ \"type\": \"Polygon\", \"coordinates\":[[]]} ",
"{ \"type\": \"MultiPoint\", \"coordinates\":[]}",
"{ \"type\": \"MultiLineString\", \"coordinates\":[]}",
"{ \"type\": \"MultiLineString\", \"coordinates\":[[]]}",
"{ \"type\": \"MultiPolygon\", \"coordinates\":[]}",
"{ \"type\": \"MultiPolygon\", \"coordinates\":[[]]}",
"{ \"type\": \"MultiPolygon\", \"coordinates\": [[[]]] }"};
for (auto const& in : valid_empty_geometries)
@ -136,6 +141,7 @@ TEST_CASE("geojson")
std::string json(in);
mapnik::geometry::geometry<double> geom;
CHECK(mapnik::json::from_geojson(json, geom));
REQUIRE(mapnik::geometry::is_empty(geom));
// round trip
std::string json_out;
CHECK(mapnik::util::to_geojson(json_out, geom));

26
test/unit/geometry/is_empty.cpp
View file

@ -1,3 +1,25 @@
/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2024 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
#include "catch.hpp"
#include <mapnik/geometry/is_empty.hpp>
@ -95,7 +117,7 @@ TEST_CASE("geometry is_empty")
mapnik::geometry::multi_line_string<double> geom;
mapnik::geometry::line_string<double> line;
geom.emplace_back(std::move(line));
REQUIRE(!mapnik::geometry::is_empty(geom));
REQUIRE(mapnik::geometry::is_empty(geom));
}
}
@ -111,7 +133,7 @@ TEST_CASE("geometry is_empty")
mapnik::geometry::linear_ring<double> ring;
poly.push_back(std::move(ring));
geom.emplace_back(std::move(poly));
REQUIRE(!mapnik::geometry::is_empty(geom));
REQUIRE(mapnik::geometry::is_empty(geom));
}
}
}