80 lines
2.3 KiB
C++
80 lines
2.3 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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#include <mapnik/geom_util.hpp>
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#include "shp_index.hpp"
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template <typename filterT>
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void shp_index<filterT>::query(const filterT& filter,std::ifstream& file,std::set<int>& pos)
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{
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file.seekg(16,std::ios::beg);
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query_node(filter,file,pos);
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}
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template <typename filterT>
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void shp_index<filterT>::query_node(const filterT& filter,std::ifstream& file,std::set<int>& ids)
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{
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int offset=read_ndr_integer(file);
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Envelope<double> node_ext;
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read_envelope(file,node_ext);
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int num_shapes=read_ndr_integer(file);
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if (!filter.pass(node_ext))
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{
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file.seekg(offset+num_shapes*4+4,std::ios::cur);
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return;
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}
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for (int i=0;i<num_shapes;++i)
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{
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int id=read_ndr_integer(file);
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ids.insert(id);
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}
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int children=read_ndr_integer(file);
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for (int j=0;j<children;++j)
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{
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query_node(filter,file,ids);
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}
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}
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template <typename filterT>
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int shp_index<filterT>::read_ndr_integer(std::ifstream& file)
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{
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char b[4];
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file.read(b,4);
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return (b[0]&0xff) | (b[1]&0xff)<<8 | (b[2]&0xff)<<16 | (b[3]&0xff)<<24;
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}
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template <typename filterT>
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void shp_index<filterT>::read_envelope(std::ifstream& file,Envelope<double>& envelope)
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{
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file.read(reinterpret_cast<char*>(&envelope),sizeof(envelope));
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}
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template class shp_index<filter_in_box>;
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template class shp_index<filter_at_point>;
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