314 lines
9.6 KiB
C++
314 lines
9.6 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2012 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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#include "topojson_datasource.hpp"
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#include "topojson_featureset.hpp"
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#include <fstream>
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#include <algorithm>
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// boost
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#include <boost/algorithm/string.hpp>
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#include <boost/spirit/include/support_multi_pass.hpp>
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// mapnik
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#include <mapnik/unicode.hpp>
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#include <mapnik/value_types.hpp>
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#include <mapnik/box2d.hpp>
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#include <mapnik/json/topojson_grammar.hpp>
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#include <mapnik/json/topojson_grammar_impl.hpp>
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#include <mapnik/json/topojson_utils.hpp>
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#include <mapnik/util/variant.hpp>
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using mapnik::datasource;
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using mapnik::parameters;
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DATASOURCE_PLUGIN(topojson_datasource)
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struct attr_value_converter : public mapnik::util::static_visitor<mapnik::eAttributeType>
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{
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mapnik::eAttributeType operator() (mapnik::value_integer /*val*/) const
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{
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return mapnik::Integer;
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}
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mapnik::eAttributeType operator() (double /*val*/) const
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{
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return mapnik::Double;
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}
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mapnik::eAttributeType operator() (float /*val*/) const
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{
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return mapnik::Double;
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}
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mapnik::eAttributeType operator() (bool /*val*/) const
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{
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return mapnik::Boolean;
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}
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mapnik::eAttributeType operator() (std::string const& /*val*/) const
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{
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return mapnik::String;
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}
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mapnik::eAttributeType operator() (mapnik::value_unicode_string const& /*val*/) const
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{
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return mapnik::String;
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}
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mapnik::eAttributeType operator() (mapnik::value_null const& /*val*/) const
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{
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return mapnik::String;
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}
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};
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struct geometry_type_visitor : public mapnik::util::static_visitor<int>
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{
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int operator() (mapnik::topojson::point const&) const
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{
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return static_cast<int>(mapnik::datasource::Point);
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}
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int operator() (mapnik::topojson::multi_point const&) const
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{
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return static_cast<int>(mapnik::datasource::Point);
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}
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int operator() (mapnik::topojson::linestring const&) const
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{
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return static_cast<int>(mapnik::datasource::LineString);
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}
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int operator() (mapnik::topojson::multi_linestring const&) const
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{
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return static_cast<int>(mapnik::datasource::LineString);
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}
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int operator() (mapnik::topojson::polygon const&) const
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{
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return static_cast<int>(mapnik::datasource::Polygon);
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}
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int operator() (mapnik::topojson::multi_polygon const&) const
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{
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return static_cast<int>(mapnik::datasource::Polygon);
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}
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int operator() (mapnik::topojson::invalid const&) const
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{
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return -1;
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}
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};
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struct collect_attributes_visitor : public mapnik::util::static_visitor<void>
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{
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mapnik::layer_descriptor & desc_;
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collect_attributes_visitor(mapnik::layer_descriptor & desc):
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desc_(desc) {}
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void operator() (mapnik::topojson::invalid const& g) {}
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template <typename GeomType>
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void operator() (GeomType const& g)
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{
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if (g.props)
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{
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for (auto const& p : *g.props)
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{
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desc_.add_descriptor(mapnik::attribute_descriptor(std::get<0>(p),
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mapnik::util::apply_visitor(attr_value_converter(),
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std::get<1>(p))));
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}
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}
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}
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};
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topojson_datasource::topojson_datasource(parameters const& params)
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: datasource(params),
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type_(datasource::Vector),
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desc_(topojson_datasource::name(),
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*params.get<std::string>("encoding","utf-8")),
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filename_(),
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inline_string_(),
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extent_(),
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tr_(new mapnik::transcoder(*params.get<std::string>("encoding","utf-8"))),
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#if BOOST_VERSION >= 105600
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tree_()
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#else
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tree_(16,1)
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#endif
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{
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boost::optional<std::string> inline_string = params.get<std::string>("inline");
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if (inline_string)
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{
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inline_string_ = *inline_string;
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}
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else
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{
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boost::optional<std::string> file = params.get<std::string>("file");
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if (!file) throw mapnik::datasource_exception("TopoJSON Plugin: missing <file> parameter");
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boost::optional<std::string> base = params.get<std::string>("base");
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if (base)
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filename_ = *base + "/" + *file;
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else
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filename_ = *file;
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}
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if (!inline_string_.empty())
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{
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std::istringstream in(inline_string_);
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parse_topojson(in);
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}
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else
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{
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#if defined (_WINDOWS)
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std::ifstream in(mapnik::utf8_to_utf16(filename_),std::ios_base::in | std::ios_base::binary);
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#else
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std::ifstream in(filename_.c_str(),std::ios_base::in | std::ios_base::binary);
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#endif
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if (!in.is_open())
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{
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throw mapnik::datasource_exception("TopoJSON Plugin: could not open: '" + filename_ + "'");
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}
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parse_topojson(in);
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in.close();
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}
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}
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template <typename T>
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void topojson_datasource::parse_topojson(T & stream)
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{
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using base_iterator_type = std::istreambuf_iterator<char>;
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boost::spirit::multi_pass<base_iterator_type> begin =
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boost::spirit::make_default_multi_pass(base_iterator_type(stream));
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boost::spirit::multi_pass<base_iterator_type> end =
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boost::spirit::make_default_multi_pass(base_iterator_type());
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static const mapnik::topojson::topojson_grammar<boost::spirit::multi_pass<base_iterator_type> > g;
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boost::spirit::standard_wide::space_type space;
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bool result = boost::spirit::qi::phrase_parse(begin, end, g, space, topo_);
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if (!result)
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{
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throw mapnik::datasource_exception("topojson_datasource: Failed parse TopoJSON file '" + filename_ + "'");
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}
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std::size_t count = 0;
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for (auto const& geom : topo_.geometries)
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{
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mapnik::box2d<double> box = mapnik::util::apply_visitor(mapnik::topojson::bounding_box_visitor(topo_), geom);
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if (box.valid())
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{
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if (count == 0)
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{
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extent_ = box;
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collect_attributes_visitor assessor(desc_);
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mapnik::util::apply_visitor( std::ref(assessor), geom);
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}
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else
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{
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extent_.expand_to_include(box);
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}
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#if BOOST_VERSION >= 105600
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tree_.insert(std::make_pair(box_type(point_type(box.minx(),box.miny()),point_type(box.maxx(),box.maxy())),count++));
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#else
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tree_.insert(box_type(point_type(box.minx(),box.miny()),point_type(box.maxx(),box.maxy())),count++);
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#endif
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}
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}
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}
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topojson_datasource::~topojson_datasource() { }
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const char * topojson_datasource::name()
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{
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return "topojson";
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}
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boost::optional<mapnik::datasource::geometry_t> topojson_datasource::get_geometry_type() const
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{
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boost::optional<mapnik::datasource::geometry_t> result;
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int multi_type = 0;
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std::size_t num_features = topo_.geometries.size();
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for (std::size_t i = 0; i < num_features && i < 5; ++i)
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{
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mapnik::topojson::geometry const& geom = topo_.geometries[i];
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int type = mapnik::util::apply_visitor(geometry_type_visitor(),geom);
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if (type > 0)
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{
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if (multi_type > 0 && multi_type != type)
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{
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result.reset(mapnik::datasource::Collection);
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return result;
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}
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else
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{
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result.reset(static_cast<mapnik::datasource::geometry_t>(type));
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}
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multi_type = type;
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}
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}
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return result;
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}
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mapnik::datasource::datasource_t topojson_datasource::type() const
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{
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return type_;
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}
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mapnik::box2d<double> topojson_datasource::envelope() const
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{
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return extent_;
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}
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mapnik::layer_descriptor topojson_datasource::get_descriptor() const
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{
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return desc_;
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}
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mapnik::featureset_ptr topojson_datasource::features(mapnik::query const& q) const
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{
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// if the query box intersects our world extent then query for features
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mapnik::box2d<double> const& b = q.get_bbox();
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if (extent_.intersects(b))
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{
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box_type box(point_type(b.minx(),b.miny()),point_type(b.maxx(),b.maxy()));
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#if BOOST_VERSION >= 105600
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topojson_featureset::array_type index_array;
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tree_.query(boost::geometry::index::intersects(box),std::back_inserter(index_array));
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return std::make_shared<topojson_featureset>(topo_, *tr_, std::move(index_array));
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#else
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index_array_ = tree_.find(box);
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return std::make_shared<topojson_featureset>(topo_, *tr_, tree_.find(box));
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#endif
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}
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// otherwise return an empty featureset pointer
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return mapnik::featureset_ptr();
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}
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mapnik::featureset_ptr topojson_datasource::features_at_point(mapnik::coord2d const& pt, double tol) const
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{
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mapnik::box2d<double> query_bbox(pt, pt);
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query_bbox.pad(tol);
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mapnik::query q(query_bbox);
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for (auto const& attr_info : desc_.get_descriptors())
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{
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q.add_property_name(attr_info.get_name());
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}
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return features(q);
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}
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