170 lines
4.4 KiB
C++
170 lines
4.4 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) 2015 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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// mapnik
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#include <mapnik/debug.hpp>
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#include <mapnik/query.hpp>
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#include <mapnik/box2d.hpp>
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#include <mapnik/memory_datasource.hpp>
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#include <mapnik/memory_featureset.hpp>
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#include <mapnik/boolean.hpp>
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#include <mapnik/geometry_envelope.hpp>
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// stl
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#include <algorithm>
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using mapnik::datasource;
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using mapnik::parameters;
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DATASOURCE_PLUGIN(mapnik::memory_datasource)
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namespace mapnik {
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struct accumulate_extent
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{
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accumulate_extent(box2d<double> & ext)
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: ext_(ext),first_(true) {}
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void operator() (feature_ptr const& feat)
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{
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auto const& geom = feat->get_geometry();
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auto bbox = geometry::envelope(geom);
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if ( first_ )
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{
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first_ = false;
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ext_ = bbox;
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}
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else
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{
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ext_.expand_to_include(bbox);
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}
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}
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box2d<double> & ext_;
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bool first_;
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};
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const char * memory_datasource::name()
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{
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return "memory";
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}
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memory_datasource::memory_datasource(parameters const& params)
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: datasource(params),
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desc_(memory_datasource::name(),
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*params.get<std::string>("encoding","utf-8")),
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type_(datasource::Vector),
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bbox_check_(*params.get<boolean_type>("bbox_check", true)),
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type_set_(false) {}
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memory_datasource::~memory_datasource() {}
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void memory_datasource::push(feature_ptr feature)
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{
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// TODO - collect attribute descriptors?
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//desc_.add_descriptor(attribute_descriptor(fld_name,mapnik::Integer));
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if (feature->get_raster())
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{
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// if a feature has a raster_ptr set it must be of raster type.
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if (!type_set_)
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{
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type_ = datasource::Raster;
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type_set_ = true;
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}
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else if (type_ == datasource::Vector)
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{
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throw std::runtime_error("Can not add a raster feature to a memory datasource that contains vectors");
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}
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}
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else
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{
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if (!type_set_)
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{
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type_set_ = true;
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}
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else if (type_ == datasource::Raster)
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{
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throw std::runtime_error("Can not add a vector feature to a memory datasource that contains rasters");
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}
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}
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features_.push_back(feature);
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dirty_extent_ = true;
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}
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datasource::datasource_t memory_datasource::type() const
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{
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return type_;
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}
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featureset_ptr memory_datasource::features(const query& q) const
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{
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return std::make_shared<memory_featureset>(q.get_bbox(),*this,bbox_check_);
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}
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featureset_ptr memory_datasource::features_at_point(coord2d const& pt, double tol) const
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{
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box2d<double> box = box2d<double>(pt.x, pt.y, pt.x, pt.y);
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box.pad(tol);
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MAPNIK_LOG_DEBUG(memory_datasource) << "memory_datasource: Box=" << box << ", Point x=" << pt.x << ",y=" << pt.y;
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return std::make_shared<memory_featureset>(box,*this);
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}
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void memory_datasource::set_envelope(box2d<double> const& box)
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{
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extent_ = box;
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dirty_extent_ = false;
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}
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box2d<double> memory_datasource::envelope() const
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{
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if (!extent_.valid() || dirty_extent_)
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{
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accumulate_extent func(extent_);
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std::for_each(features_.begin(),features_.end(),func);
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dirty_extent_ = false;
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}
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return extent_;
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}
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boost::optional<datasource_geometry_t> memory_datasource::get_geometry_type() const
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{
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// TODO - detect this?
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return datasource_geometry_t::Collection;
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}
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layer_descriptor memory_datasource::get_descriptor() const
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{
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return desc_;
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}
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size_t memory_datasource::size() const
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{
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return features_.size();
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}
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void memory_datasource::clear()
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{
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features_.clear();
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}
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}
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