300 lines
8.8 KiB
C++
300 lines
8.8 KiB
C++
/*****************************************************************************
|
|
*
|
|
* This file is part of Mapnik (c++ mapping toolkit)
|
|
*
|
|
* Copyright (C) 2015 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 "topojson_datasource.hpp"
|
|
#include "topojson_featureset.hpp"
|
|
|
|
#include <fstream>
|
|
#include <algorithm>
|
|
|
|
// boost
|
|
#include <boost/algorithm/string.hpp>
|
|
|
|
// mapnik
|
|
#include <mapnik/unicode.hpp>
|
|
#include <mapnik/value_types.hpp>
|
|
#include <mapnik/box2d.hpp>
|
|
#include <mapnik/geometry_adapters.hpp>
|
|
#include <mapnik/json/topojson_grammar.hpp>
|
|
#include <mapnik/json/topojson_utils.hpp>
|
|
#include <mapnik/util/variant.hpp>
|
|
#include <mapnik/util/file_io.hpp>
|
|
#include <mapnik/make_unique.hpp>
|
|
|
|
using mapnik::datasource;
|
|
using mapnik::parameters;
|
|
|
|
DATASOURCE_PLUGIN(topojson_datasource)
|
|
|
|
struct attr_value_converter
|
|
{
|
|
mapnik::eAttributeType operator() (mapnik::value_integer /*val*/) const
|
|
{
|
|
return mapnik::Integer;
|
|
}
|
|
|
|
mapnik::eAttributeType operator() (double /*val*/) const
|
|
{
|
|
return mapnik::Double;
|
|
}
|
|
|
|
mapnik::eAttributeType operator() (float /*val*/) const
|
|
{
|
|
return mapnik::Double;
|
|
}
|
|
|
|
mapnik::eAttributeType operator() (bool /*val*/) const
|
|
{
|
|
return mapnik::Boolean;
|
|
}
|
|
// string, object, array
|
|
template <typename T>
|
|
mapnik::eAttributeType operator() (T const& /*val*/) const
|
|
{
|
|
return mapnik::String;
|
|
}
|
|
};
|
|
|
|
struct geometry_type_visitor
|
|
{
|
|
int operator() (mapnik::topojson::point const&) const
|
|
{
|
|
return static_cast<int>(mapnik::datasource_geometry_t::Point);
|
|
}
|
|
int operator() (mapnik::topojson::multi_point const&) const
|
|
{
|
|
return static_cast<int>(mapnik::datasource_geometry_t::Point);
|
|
}
|
|
int operator() (mapnik::topojson::linestring const&) const
|
|
{
|
|
return static_cast<int>(mapnik::datasource_geometry_t::LineString);
|
|
}
|
|
int operator() (mapnik::topojson::multi_linestring const&) const
|
|
{
|
|
return static_cast<int>(mapnik::datasource_geometry_t::LineString);
|
|
}
|
|
int operator() (mapnik::topojson::polygon const&) const
|
|
{
|
|
return static_cast<int>(mapnik::datasource_geometry_t::Polygon);
|
|
}
|
|
int operator() (mapnik::topojson::multi_polygon const&) const
|
|
{
|
|
return static_cast<int>(mapnik::datasource_geometry_t::Polygon);
|
|
}
|
|
template <typename T>
|
|
int operator() (T const& ) const
|
|
{
|
|
return 0;
|
|
}
|
|
};
|
|
|
|
struct collect_attributes_visitor
|
|
{
|
|
mapnik::layer_descriptor & desc_;
|
|
collect_attributes_visitor(mapnik::layer_descriptor & desc):
|
|
desc_(desc) {}
|
|
|
|
// no-op
|
|
void operator() (mapnik::topojson::empty) {}
|
|
//
|
|
template <typename GeomType>
|
|
void operator() (GeomType const& g)
|
|
{
|
|
if (g.props)
|
|
{
|
|
for (auto const& p : *g.props)
|
|
{
|
|
desc_.add_descriptor(mapnik::attribute_descriptor(std::get<0>(p),
|
|
mapnik::util::apply_visitor(attr_value_converter(),
|
|
std::get<1>(p))));
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
topojson_datasource::topojson_datasource(parameters const& params)
|
|
: datasource(params),
|
|
type_(datasource::Vector),
|
|
desc_(topojson_datasource::name(),
|
|
*params.get<std::string>("encoding","utf-8")),
|
|
filename_(),
|
|
inline_string_(),
|
|
extent_(),
|
|
tr_(new mapnik::transcoder(*params.get<std::string>("encoding","utf-8"))),
|
|
tree_(nullptr)
|
|
{
|
|
boost::optional<std::string> inline_string = params.get<std::string>("inline");
|
|
if (inline_string)
|
|
{
|
|
inline_string_ = *inline_string;
|
|
}
|
|
else
|
|
{
|
|
boost::optional<std::string> file = params.get<std::string>("file");
|
|
if (!file) throw mapnik::datasource_exception("TopoJSON Plugin: missing <file> parameter");
|
|
|
|
boost::optional<std::string> base = params.get<std::string>("base");
|
|
if (base)
|
|
filename_ = *base + "/" + *file;
|
|
else
|
|
filename_ = *file;
|
|
}
|
|
if (!inline_string_.empty())
|
|
{
|
|
parse_topojson(inline_string_);
|
|
}
|
|
else
|
|
{
|
|
mapnik::util::file file(filename_);
|
|
if (!file)
|
|
{
|
|
throw mapnik::datasource_exception("TopoJSON Plugin: could not open: '" + filename_ + "'");
|
|
}
|
|
std::string file_buffer;
|
|
file_buffer.resize(file.size());
|
|
std::fread(&file_buffer[0], file.size(), 1, file.get());
|
|
parse_topojson(file_buffer);
|
|
}
|
|
}
|
|
|
|
namespace {
|
|
using base_iterator_type = std::string::const_iterator;
|
|
const mapnik::topojson::topojson_grammar<base_iterator_type> g;
|
|
}
|
|
|
|
template <typename T>
|
|
void topojson_datasource::parse_topojson(T const& buffer)
|
|
{
|
|
boost::spirit::standard::space_type space;
|
|
bool result = boost::spirit::qi::phrase_parse(buffer.begin(), buffer.end(), g, space, topo_);
|
|
if (!result)
|
|
{
|
|
throw mapnik::datasource_exception("topojson_datasource: Failed parse TopoJSON file '" + filename_ + "'");
|
|
}
|
|
|
|
using values_container = std::vector< std::pair<box_type, std::size_t> >;
|
|
values_container values;
|
|
values.reserve(topo_.geometries.size());
|
|
|
|
std::size_t geometry_index = 0;
|
|
bool first = true;
|
|
for (auto const& geom : topo_.geometries)
|
|
{
|
|
mapnik::box2d<double> box = mapnik::util::apply_visitor(mapnik::topojson::bounding_box_visitor(topo_), geom);
|
|
if (box.valid())
|
|
{
|
|
if (first)
|
|
{
|
|
first = false;
|
|
extent_ = box;
|
|
collect_attributes_visitor assessor(desc_);
|
|
mapnik::util::apply_visitor( std::ref(assessor), geom);
|
|
}
|
|
else
|
|
{
|
|
extent_.expand_to_include(box);
|
|
}
|
|
values.emplace_back(box, geometry_index);
|
|
}
|
|
++geometry_index;
|
|
}
|
|
|
|
// packing algorithm
|
|
tree_ = std::make_unique<spatial_index_type>(values);
|
|
}
|
|
|
|
topojson_datasource::~topojson_datasource() { }
|
|
|
|
const char * topojson_datasource::name()
|
|
{
|
|
return "topojson";
|
|
}
|
|
|
|
boost::optional<mapnik::datasource_geometry_t> topojson_datasource::get_geometry_type() const
|
|
{
|
|
boost::optional<mapnik::datasource_geometry_t> result;
|
|
int multi_type = 0;
|
|
std::size_t num_features = topo_.geometries.size();
|
|
for (std::size_t i = 0; i < num_features && i < 5; ++i)
|
|
{
|
|
mapnik::topojson::geometry const& geom = topo_.geometries[i];
|
|
int type = mapnik::util::apply_visitor(geometry_type_visitor(),geom);
|
|
if (type > 0)
|
|
{
|
|
if (multi_type > 0 && multi_type != type)
|
|
{
|
|
result.reset(mapnik::datasource_geometry_t::Collection);
|
|
return result;
|
|
}
|
|
else
|
|
{
|
|
result.reset(static_cast<mapnik::datasource_geometry_t>(type));
|
|
}
|
|
multi_type = type;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
mapnik::datasource::datasource_t topojson_datasource::type() const
|
|
{
|
|
return type_;
|
|
}
|
|
|
|
mapnik::box2d<double> topojson_datasource::envelope() const
|
|
{
|
|
return extent_;
|
|
}
|
|
|
|
mapnik::layer_descriptor topojson_datasource::get_descriptor() const
|
|
{
|
|
return desc_;
|
|
}
|
|
|
|
mapnik::featureset_ptr topojson_datasource::features(mapnik::query const& q) const
|
|
{
|
|
// if the query box intersects our world extent then query for features
|
|
mapnik::box2d<double> const& box = q.get_bbox();
|
|
if (extent_.intersects(box))
|
|
{
|
|
topojson_featureset::array_type index_array;
|
|
if (tree_)
|
|
{
|
|
tree_->query(boost::geometry::index::intersects(box),std::back_inserter(index_array));
|
|
return std::make_shared<topojson_featureset>(topo_, *tr_, std::move(index_array));
|
|
}
|
|
}
|
|
// otherwise return an empty featureset pointer
|
|
return mapnik::featureset_ptr();
|
|
}
|
|
|
|
mapnik::featureset_ptr topojson_datasource::features_at_point(mapnik::coord2d const& pt, double tol) const
|
|
{
|
|
mapnik::box2d<double> query_bbox(pt, pt);
|
|
query_bbox.pad(tol);
|
|
mapnik::query q(query_bbox);
|
|
for (auto const& attr_info : desc_.get_descriptors())
|
|
{
|
|
q.add_property_name(attr_info.get_name());
|
|
}
|
|
return features(q);
|
|
}
|