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160 lines
4.9 KiB
C++
160 lines
4.9 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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#ifndef MAPNIK_GEOMETRY_WKT_GENERATOR_HPP
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#define MAPNIK_GEOMETRY_WKT_GENERATOR_HPP
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// mapnik
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#include <mapnik/global.hpp>
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#include <mapnik/geometry.hpp>
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#include <mapnik/util/vertex_iterator.hpp>
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#include <mapnik/util/container_adapter.hpp>
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// boost
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#include <boost/tuple/tuple.hpp>
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#include <boost/spirit/include/karma.hpp>
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#include <boost/spirit/include/phoenix_core.hpp>
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#include <boost/spirit/include/phoenix_operator.hpp>
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#include <boost/spirit/include/phoenix_fusion.hpp>
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#include <boost/spirit/include/phoenix_function.hpp>
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#include <boost/spirit/home/phoenix/statement/if.hpp>
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#include <boost/fusion/include/boost_tuple.hpp>
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//#define BOOST_SPIRIT_USE_PHOENIX_V3 1
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namespace mapnik { namespace util {
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namespace karma = boost::spirit::karma;
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namespace phoenix = boost::phoenix;
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struct get_type
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{
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template <typename T>
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struct result { typedef int type; };
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int operator() (geometry_type const& geom) const
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{
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return (int)geom.type();
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}
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};
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struct get_first
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{
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template <typename T>
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struct result { typedef geometry_type::value_type const type; };
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geometry_type::value_type const operator() (geometry_type const& geom) const
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{
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geometry_type::value_type coord;
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boost::get<0>(coord) = geom.get_vertex(0,&boost::get<1>(coord),&boost::get<2>(coord));
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return coord;
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}
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};
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template <typename T>
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struct coordinate_policy : karma::real_policies<T>
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{
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typedef boost::spirit::karma::real_policies<T> base_type;
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static int floatfield(T n) { return base_type::fmtflags::fixed; }
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};
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template <typename OutputIterator>
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struct wkt_generator :
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karma::grammar<OutputIterator, geometry_type const& ()>
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{
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wkt_generator()
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: wkt_generator::base_type(wkt)
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{
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using boost::spirit::karma::uint_;
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using boost::spirit::karma::_val;
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using boost::spirit::karma::_1;
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using boost::spirit::karma::lit;
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using boost::spirit::karma::_a;
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using boost::spirit::karma::_r1;
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using boost::spirit::karma::eps;
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wkt = point | linestring | polygon
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;
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point = &uint_(mapnik::Point)[_1 = _type(_val)]
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<< lit("Point(") << point_coord [_1 = _first(_val)] << lit(')')
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;
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linestring = &uint_(mapnik::LineString)[_1 = _type(_val)]
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<< lit("LineString(")
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<< coords
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<< lit(')')
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;
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polygon = &uint_(mapnik::Polygon)[_1 = _type(_val)]
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<< lit("Polygon(")
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<< coords2
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<< lit("))")
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;
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point_coord = &uint_ << coord_type << lit(' ') << coord_type
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;
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polygon_coord %= ( &uint_(mapnik::SEG_MOVETO) << eps[_r1 += 1]
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<< karma::string[ if_ (_r1 > 1) [_1 = "),("]
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.else_[_1 = "("] ] | &uint_ << ",")
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<< coord_type
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<< lit(' ')
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<< coord_type
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;
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coords2 %= *polygon_coord(_a)
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;
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coords = point_coord % lit(',')
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;
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}
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// rules
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karma::rule<OutputIterator, geometry_type const& ()> wkt;
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karma::rule<OutputIterator, geometry_type const& ()> point;
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karma::rule<OutputIterator, geometry_type const& ()> linestring;
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karma::rule<OutputIterator, geometry_type const& ()> polygon;
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karma::rule<OutputIterator, geometry_type const& ()> coords;
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karma::rule<OutputIterator, karma::locals<unsigned>, geometry_type const& ()> coords2;
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karma::rule<OutputIterator, geometry_type::value_type ()> point_coord;
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karma::rule<OutputIterator, geometry_type::value_type (unsigned& )> polygon_coord;
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// phoenix functions
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phoenix::function<get_type > _type;
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phoenix::function<get_first> _first;
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//
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karma::real_generator<double, coordinate_policy<double> > coord_type;
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};
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}}
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#endif // MAPNIK_GEOMETRY_WKT_GENERATOR_HPP
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