246 lines
7.5 KiB
C++
246 lines
7.5 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) 2006 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: shape_index_featureset.cc 36 2005-04-05 14:32:18Z pavlenko $
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#include <mapnik/feature_factory.hpp>
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// boost
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#include "shape_index_featureset.hpp"
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using namespace boost::iostreams;
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template <typename filterT>
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shape_index_featureset<filterT>::shape_index_featureset(const filterT& filter,
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shape_io& shape,
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const std::set<std::string>& attribute_names,
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std::string const& encoding)
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: filter_(filter),
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shape_type_(0),
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shape_(shape),
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tr_(new transcoder(encoding)),
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count_(0)
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{
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shape_.shp().skip(100);
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boost::shared_ptr<shape_file> index = shape_.index();
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if (index)
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{
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shp_index<filterT,stream<mapped_file_source> >::query(filter,index->file(),ids_);
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}
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std::sort(ids_.begin(),ids_.end());
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#ifdef MAPNIK_DEBUG
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std::clog<< "query size=" << ids_.size() << "\n";
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#endif
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itr_ = ids_.begin();
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// deal with attributes
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std::set<std::string>::const_iterator pos=attribute_names.begin();
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while (pos!=attribute_names.end())
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{
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bool found_name = false;
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for (int i=0;i<shape_.dbf().num_fields();++i)
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{
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if (shape_.dbf().descriptor(i).name_ == *pos)
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{
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attr_ids_.insert(i);
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found_name = true;
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break;
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}
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}
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if (!found_name)
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{
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std::ostringstream s;
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s << "Shapefile Plugin: Error: no attribute by the name of '" << *pos << "'"
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<< ", available attributes are:";
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for (int i=0;i<shape_.dbf().num_fields();++i)
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{
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s << " '" << shape_.dbf().descriptor(i).name_ << "'";
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}
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throw mapnik::datasource_exception( s.str() );
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}
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++pos;
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}
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}
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template <typename filterT>
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feature_ptr shape_index_featureset<filterT>::next()
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{
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using mapnik::feature_factory;
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using mapnik::point_impl;
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if (itr_!=ids_.end())
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{
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int pos=*itr_++;
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shape_.move_to(pos);
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int type=shape_.type();
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feature_ptr feature(feature_factory::create(shape_.id_));
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if (type == shape_io::shape_point)
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{
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double x=shape_.shp().read_double();
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double y=shape_.shp().read_double();
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geometry2d * point = new point_impl;
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point->move_to(x,y);
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feature->add_geometry(point);
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++count_;
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}
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else if (type == shape_io::shape_pointm)
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{
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double x=shape_.shp().read_double();
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double y=shape_.shp().read_double();
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shape_.shp().skip(8);// skip m
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geometry2d * point = new point_impl;
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point->move_to(x,y);
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feature->add_geometry(point);
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++count_;
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}
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else if (type == shape_io::shape_pointz)
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{
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double x=shape_.shp().read_double();
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double y=shape_.shp().read_double();
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// skip z
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shape_.shp().skip(8);
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//skip m if exists
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if ( shape_.reclength_ == 8 + 36)
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{
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shape_.shp().skip(8);
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}
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geometry2d * point = new point_impl;
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point->move_to(x,y);
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feature->add_geometry(point);
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++count_;
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}
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else
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{
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while(!filter_.pass(shape_.current_extent()) &&
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itr_!=ids_.end())
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{
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pos=*itr_++;
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shape_.move_to(pos);
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}
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switch (type)
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{
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case shape_io::shape_multipoint:
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case shape_io::shape_multipointm:
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case shape_io::shape_multipointz:
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{
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int num_points = shape_.shp().read_ndr_integer();
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for (int i=0; i< num_points;++i)
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{
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double x=shape_.shp().read_double();
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double y=shape_.shp().read_double();
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geometry2d * point = new point_impl;
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point->move_to(x,y);
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feature->add_geometry(point);
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}
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// ignore m and z for now
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++count_;
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break;
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}
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case shape_io::shape_polyline:
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{
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geometry2d * line = shape_.read_polyline();
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feature->add_geometry(line);
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++count_;
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break;
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}
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case shape_io::shape_polylinem:
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{
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geometry2d * line = shape_.read_polylinem();
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feature->add_geometry(line);
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++count_;
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break;
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}
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case shape_io::shape_polylinez:
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{
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geometry2d * line = shape_.read_polylinez();
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feature->add_geometry(line);
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++count_;
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break;
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}
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case shape_io::shape_polygon:
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{
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geometry2d * poly = shape_.read_polygon();
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feature->add_geometry(poly);
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++count_;
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break;
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}
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case shape_io::shape_polygonm:
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{
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geometry2d * poly = shape_.read_polygonm();
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feature->add_geometry(poly);
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++count_;
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break;
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}
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case shape_io::shape_polygonz:
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{
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geometry2d * poly = shape_.read_polygonz();
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feature->add_geometry(poly);
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++count_;
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break;
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}
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}
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}
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if (attr_ids_.size())
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{
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shape_.dbf().move_to(shape_.id_);
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std::set<int>::const_iterator pos=attr_ids_.begin();
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while (pos!=attr_ids_.end())
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{
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try
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{
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shape_.dbf().add_attribute(*pos,*tr_,*feature);
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}
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catch (...)
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{
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std::clog<<"exception caught\n";
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}
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++pos;
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}
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}
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return feature;
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}
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else
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{
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#ifdef MAPNIK_DEBUG
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std::clog<<count_<<" features\n";
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#endif
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return feature_ptr();
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}
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}
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template <typename filterT>
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shape_index_featureset<filterT>::~shape_index_featureset() {}
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template class shape_index_featureset<mapnik::filter_in_box>;
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template class shape_index_featureset<mapnik::filter_at_point>;
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