129 lines
3.5 KiB
C++
129 lines
3.5 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) 2011 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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//$Id$
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// mapnik
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#include <mapnik/memory_datasource.hpp>
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#include <mapnik/memory_featureset.hpp>
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#include <mapnik/feature_factory.hpp>
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// stl
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#include <algorithm>
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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 feat)
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{
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for (unsigned i=0;i<feat->num_geometries();++i)
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{
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geometry_type & geom = feat->get_geometry(i);
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if ( first_ )
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{
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first_ = false;
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ext_ = geom.envelope();
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}
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else
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{
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ext_.expand_to_include(geom.envelope());
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}
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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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memory_datasource::memory_datasource()
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: datasource(parameters()),
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desc_("in-memory datasource","utf-8") {}
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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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features_.push_back(feature);
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}
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int memory_datasource::type() const
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{
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return datasource::Vector;
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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 featureset_ptr(new memory_featureset(q.get_bbox(),*this));
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}
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featureset_ptr memory_datasource::features_at_point(coord2d const& pt) 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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#ifdef MAPNIK_DEBUG
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std::clog << "box=" << box << ", pt x=" << pt.x << ", y=" << pt.y << "\n";
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#endif
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return featureset_ptr(new memory_featureset(box,*this));
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}
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box2d<double> memory_datasource::envelope() const
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{
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box2d<double> ext;
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accumulate_extent func(ext);
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std::for_each(features_.begin(),features_.end(),func);
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return ext;
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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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// point_datasource
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void point_datasource::add_point(double x, double y, const char* key, const char* value)
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{
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feature_ptr feature(feature_factory::create(feature_id_));
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++feature_id_;
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geometry_type * pt = new geometry_type(Point);
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pt->move_to(x,y);
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feature->add_geometry(pt);
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transcoder tr("utf-8");
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(*feature)[key] = tr.transcode(value);
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this->push(feature);
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}
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}
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