253 lines
7.4 KiB
C++
253 lines
7.4 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) 2014 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 "geobuf_datasource.hpp"
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#include "geobuf_featureset.hpp"
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#include "geobuf.hpp"
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#include <fstream>
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#include <algorithm>
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#include <functional>
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// boost
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#include <boost/algorithm/string.hpp>
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// mapnik
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#include <mapnik/unicode.hpp>
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#include <mapnik/feature.hpp>
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#include <mapnik/feature_kv_iterator.hpp>
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#include <mapnik/value/types.hpp>
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#include <mapnik/debug.hpp>
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#include <mapnik/proj_transform.hpp>
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#include <mapnik/projection.hpp>
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#include <mapnik/util/geometry_to_ds_type.hpp>
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#include <mapnik/util/variant.hpp>
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#include <mapnik/util/file_io.hpp>
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#include <mapnik/make_unique.hpp>
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#include <mapnik/geometry/boost_adapters.hpp>
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using mapnik::datasource;
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using mapnik::parameters;
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DATASOURCE_PLUGIN(geobuf_datasource)
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struct attr_value_converter
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{
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mapnik::eAttributeType operator() (mapnik::value_integer) const
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{
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return mapnik::Integer;
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}
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mapnik::eAttributeType operator() (double) const
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{
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return mapnik::Double;
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}
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mapnik::eAttributeType operator() (float) const
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{
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return mapnik::Double;
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}
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mapnik::eAttributeType operator() (bool) 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& ) 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&) 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& ) const
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{
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return mapnik::String;
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}
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};
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geobuf_datasource::geobuf_datasource(parameters const& params)
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: datasource(params),
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type_(datasource::Vector),
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desc_(geobuf_datasource::name(),
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*params.get<std::string>("encoding","utf-8")),
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filename_(),
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extent_(),
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features_(),
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tree_(nullptr)
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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("Geobuf 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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mapnik::util::file in(filename_);
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if (!in.is_open())
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{
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throw mapnik::datasource_exception("Geobuf Plugin: could not open: '" + filename_ + "'");
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}
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std::vector<std::uint8_t> geobuf;
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geobuf.resize(in.size());
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std::fread(geobuf.data(), in.size(), 1, in.get());
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parse_geobuf(geobuf.data(), geobuf.size());
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}
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namespace {
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template <typename T>
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struct push_feature
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{
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using features_container = T;
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push_feature(features_container & features)
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: features_(features) {}
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void operator() (mapnik::feature_ptr const& feature)
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{
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features_.push_back(feature);
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}
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features_container & features_;
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};
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}
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void geobuf_datasource::parse_geobuf(std::uint8_t const* data, std::size_t size)
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{
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using push_feature_callback = push_feature<std::vector<mapnik::feature_ptr>>;
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push_feature_callback callback(features_);
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mapnik::util::geobuf<push_feature_callback> buf(data, size, callback);
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buf.read();
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std::cerr << "Num of features = " << features_.size() << std::endl;
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using values_container = std::vector< std::pair<box_type, std::pair<std::size_t, std::size_t>>>;
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values_container values;
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values.reserve(features_.size());
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tree_ = std::make_unique<spatial_index_type>(values);
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std::size_t geometry_index = 0;
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for (mapnik::feature_ptr const& f : features_)
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{
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mapnik::box2d<double> box = f->envelope();
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if (box.valid())
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{
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if (geometry_index == 0)
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{
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extent_ = box;
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for ( auto const& kv : *f)
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{
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desc_.add_descriptor(mapnik::attribute_descriptor(std::get<0>(kv),
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mapnik::util::apply_visitor(attr_value_converter(),
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std::get<1>(kv))));
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}
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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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}
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values.emplace_back(box, std::make_pair(geometry_index,0));
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++geometry_index;
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}
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// packing algorithm
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tree_ = std::make_unique<spatial_index_type>(values);
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}
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geobuf_datasource::~geobuf_datasource() {}
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const char * geobuf_datasource::name()
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{
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return "geobuf";
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}
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boost::optional<mapnik::datasource_geometry_t> geobuf_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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unsigned num_features = features_.size();
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for (unsigned i = 0; i < num_features && i < 5; ++i)
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{
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result = mapnik::util::to_ds_type(features_[i]->get_geometry());
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if (result)
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{
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int type = static_cast<int>(*result);
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if (multi_type > 0 && multi_type != type)
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{
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result.reset(mapnik::datasource_geometry_t::Collection);
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return result;
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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 geobuf_datasource::type() const
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{
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return type_;
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}
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mapnik::box2d<double> geobuf_datasource::envelope() const
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{
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return extent_;
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}
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mapnik::layer_descriptor geobuf_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 geobuf_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& box = q.get_bbox();
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if (extent_.intersects(box))
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{
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geobuf_featureset::array_type index_array;
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if (tree_)
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{
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tree_->query(boost::geometry::index::intersects(box), std::back_inserter(index_array));
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return std::make_shared<geobuf_featureset>(features_, std::move(index_array));
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}
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}
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return mapnik::featureset_ptr();
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}
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mapnik::featureset_ptr geobuf_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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std::vector<mapnik::attribute_descriptor> const& desc = desc_.get_descriptors();
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std::vector<mapnik::attribute_descriptor>::const_iterator itr = desc.begin();
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std::vector<mapnik::attribute_descriptor>::const_iterator end = desc.end();
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for ( ;itr!=end;++itr)
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{
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q.add_property_name(itr->get_name());
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}
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return features(q);
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}
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