279 lines
9.5 KiB
C++
279 lines
9.5 KiB
C++
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/*****************************************************************************
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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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#include <iostream>
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#include "shape_featureset.hpp"
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template <typename filterT>
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shape_featureset<filterT>::shape_featureset(const filterT& filter,
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const std::string& shape_file,
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const std::set<std::string>& attribute_names,
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std::string const& encoding,
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long file_length )
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: filter_(filter),
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shape_type_(shape_io::shape_null),
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shape_(shape_file, false),
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query_ext_(),
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tr_(new transcoder(encoding)),
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file_length_(file_length),
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count_(0)
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{
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shape_.shp().skip(100);
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//attributes
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typename 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_.push_back(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 << "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( "Shape Plugin: " + 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_featureset<filterT>::next()
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{
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using mapnik::geometry_type;
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std::streampos pos=shape_.shp().pos();
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if (pos < std::streampos(file_length_ * 2))
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{
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shape_.move_to(pos);
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int type=shape_.type();
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feature_ptr feature(new Feature(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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geometry_type * point = new geometry_type(mapnik::Point);
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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); //m
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geometry_type * point = new geometry_type(mapnik::Point);
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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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geometry_type * point=new geometry_type(mapnik::Point);
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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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{
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if (!shape_.shp().is_eof())
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{
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std::streampos pos = shape_.shp().pos();
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if (shape_.type() != shape_io::shape_null)
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{
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pos += std::streampos(2 * shape_.reclength_ - 36);
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}
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shape_.move_to(pos);
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}
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else
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{
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return feature_ptr();
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}
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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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{
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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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geometry_type * point = new geometry_type(mapnik::Point);
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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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++count_;
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break;
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}
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case shape_io::shape_multipointm:
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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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geometry_type * point = new geometry_type(mapnik::Point);
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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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// skip m
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shape_.shp().skip(2*8 + 8*num_points);
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++count_;
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break;
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}
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case shape_io::shape_multipointz:
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{
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unsigned num_points = shape_.shp().read_ndr_integer();
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for (unsigned 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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geometry_type * point = new geometry_type(mapnik::Point);
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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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// skip z
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shape_.shp().skip(2*8 + 8*num_points);
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// check if we have measure data
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if ( shape_.reclength_ == num_points * 16 + 36)
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{
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// skip m
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shape_.shp().skip(2*8 + 8*num_points);
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}
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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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geometry_type * 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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geometry_type * 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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geometry_type * 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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geometry_type * 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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geometry_type * 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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geometry_type * 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::vector<int>::const_iterator pos=attr_ids_.begin();
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std::vector<int>::const_iterator end=attr_ids_.end();
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while (pos!=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);//TODO optimize!!!
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}
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catch (...)
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{
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std::clog << "Shape Plugin: error processing attributes " << std::endl;
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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 << "Shape Plugin: total shapes read=" << count_ << std::endl;
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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_featureset<filterT>::~shape_featureset() {}
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template class shape_featureset<mapnik::filter_in_box>;
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template class shape_featureset<mapnik::filter_at_point>;
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