279 lines
8.4 KiB
C++
279 lines
8.4 KiB
C++
/*****************************************************************************
|
|
*
|
|
* This file is part of Mapnik (c++ mapping toolkit)
|
|
*
|
|
* Copyright (C) 2012 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/variant.hpp>
|
|
#include <boost/algorithm/string.hpp>
|
|
#include <boost/spirit/include/support_multi_pass.hpp>
|
|
|
|
#include <boost/geometry/geometries/box.hpp>
|
|
#include <boost/geometry/geometries/geometries.hpp>
|
|
#include <boost/geometry.hpp>
|
|
#include <boost/geometry/extensions/index/rtree/rtree.hpp>
|
|
|
|
// mapnik
|
|
#include <mapnik/unicode.hpp>
|
|
#include <mapnik/value_types.hpp>
|
|
#include <mapnik/box2d.hpp>
|
|
#include <mapnik/json/topojson_grammar.hpp>
|
|
#include <mapnik/json/topojson_utils.hpp>
|
|
|
|
using mapnik::datasource;
|
|
using mapnik::parameters;
|
|
|
|
DATASOURCE_PLUGIN(topojson_datasource)
|
|
|
|
struct attr_value_converter : public boost::static_visitor<mapnik::eAttributeType>
|
|
{
|
|
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;
|
|
}
|
|
|
|
mapnik::eAttributeType operator() (std::string const& /*val*/) const
|
|
{
|
|
return mapnik::String;
|
|
}
|
|
|
|
mapnik::eAttributeType operator() (mapnik::value_unicode_string const& /*val*/) const
|
|
{
|
|
return mapnik::String;
|
|
}
|
|
|
|
mapnik::eAttributeType operator() (mapnik::value_null const& /*val*/) const
|
|
{
|
|
return mapnik::String;
|
|
}
|
|
};
|
|
|
|
struct geometry_type_visitor : public boost::static_visitor<int>
|
|
{
|
|
int operator() (mapnik::topojson::point const&) const
|
|
{
|
|
return static_cast<int>(mapnik::datasource::Point);
|
|
}
|
|
int operator() (mapnik::topojson::multi_point const&) const
|
|
{
|
|
return static_cast<int>(mapnik::datasource::Point);
|
|
}
|
|
int operator() (mapnik::topojson::linestring const&) const
|
|
{
|
|
return static_cast<int>(mapnik::datasource::LineString);
|
|
}
|
|
int operator() (mapnik::topojson::multi_linestring const&) const
|
|
{
|
|
return static_cast<int>(mapnik::datasource::LineString);
|
|
}
|
|
int operator() (mapnik::topojson::polygon const&) const
|
|
{
|
|
return static_cast<int>(mapnik::datasource::Polygon);
|
|
}
|
|
int operator() (mapnik::topojson::multi_polygon const&) const
|
|
{
|
|
return static_cast<int>(mapnik::datasource::Polygon);
|
|
}
|
|
int operator() (mapnik::topojson::invalid const&) const
|
|
{
|
|
return -1;
|
|
}
|
|
};
|
|
|
|
struct collect_attributes_visitor : public boost::static_visitor<void>
|
|
{
|
|
mapnik::layer_descriptor & desc_;
|
|
collect_attributes_visitor(mapnik::layer_descriptor & desc):
|
|
desc_(desc) {}
|
|
|
|
void operator() (mapnik::topojson::invalid const& g) {}
|
|
|
|
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),
|
|
boost::apply_visitor(attr_value_converter(),std::get<1>(p))));
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
topojson_datasource::topojson_datasource(parameters const& params)
|
|
: datasource(params),
|
|
type_(datasource::Vector),
|
|
desc_(*params.get<std::string>("type"),
|
|
*params.get<std::string>("encoding","utf-8")),
|
|
file_(*params.get<std::string>("file","")),
|
|
extent_(),
|
|
tr_(new mapnik::transcoder(*params.get<std::string>("encoding","utf-8"))),
|
|
tree_(16,1)
|
|
{
|
|
if (file_.empty()) throw mapnik::datasource_exception("TopoJSON Plugin: missing <file> parameter");
|
|
|
|
boost::optional<std::string> base = params.get<std::string>("base");
|
|
if (base)
|
|
{
|
|
file_ = *base + "/" + file_;
|
|
}
|
|
|
|
typedef std::istreambuf_iterator<char> base_iterator_type;
|
|
|
|
#if defined (_WINDOWS)
|
|
std::ifstream is(mapnik::utf8_to_utf16(file_),std::ios_base::in | std::ios_base::binary);
|
|
#else
|
|
std::ifstream is(file_.c_str(),std::ios_base::in | std::ios_base::binary);
|
|
#endif
|
|
if (!is.is_open())
|
|
{
|
|
throw mapnik::datasource_exception("TopoJSON Plugin: could not open: '" + file_ + "'");
|
|
}
|
|
|
|
boost::spirit::multi_pass<base_iterator_type> begin =
|
|
boost::spirit::make_default_multi_pass(base_iterator_type(is));
|
|
|
|
boost::spirit::multi_pass<base_iterator_type> end =
|
|
boost::spirit::make_default_multi_pass(base_iterator_type());
|
|
|
|
mapnik::topojson::topojson_grammar<boost::spirit::multi_pass<base_iterator_type> > g;
|
|
bool result = boost::spirit::qi::phrase_parse(begin, end, g, boost::spirit::standard_wide::space, topo_);
|
|
if (!result)
|
|
{
|
|
throw mapnik::datasource_exception("topojson_datasource: Failed parse TopoJSON file '" + file_ + "'");
|
|
}
|
|
|
|
std::size_t count = 0;
|
|
for (auto const& geom : topo_.geometries)
|
|
{
|
|
mapnik::box2d<double> bbox = boost::apply_visitor(mapnik::topojson::bounding_box_visitor(topo_), geom);
|
|
if (bbox.valid())
|
|
{
|
|
if (count == 0)
|
|
{
|
|
extent_ = bbox;
|
|
collect_attributes_visitor assessor(desc_);
|
|
boost::apply_visitor(assessor,geom);
|
|
}
|
|
else
|
|
{
|
|
extent_.expand_to_include(bbox);
|
|
}
|
|
tree_.insert(box_type(point_type(bbox.minx(),bbox.miny()),point_type(bbox.maxx(),bbox.maxy())), count);
|
|
}
|
|
++count;
|
|
}
|
|
}
|
|
|
|
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 = boost::apply_visitor(geometry_type_visitor(),geom);
|
|
if (type > 0)
|
|
{
|
|
if (multi_type > 0 && multi_type != type)
|
|
{
|
|
result.reset(mapnik::datasource::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& b = q.get_bbox();
|
|
if (extent_.intersects(b))
|
|
{
|
|
box_type box(point_type(b.minx(),b.miny()),point_type(b.maxx(),b.maxy()));
|
|
return std::make_shared<topojson_featureset>(topo_, *tr_, tree_.find(box));
|
|
}
|
|
// 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);
|
|
}
|