153 lines
5.7 KiB
C++
153 lines
5.7 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) 2014 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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#if defined(SVG_RENDERER)
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// mapnik
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#include <mapnik/symbolizer.hpp>
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#include <mapnik/feature.hpp>
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#include <mapnik/transform_path_adapter.hpp>
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#include <mapnik/svg/output/svg_renderer.hpp>
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#include <mapnik/svg/geometry_svg_generator_impl.hpp>
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#include <mapnik/svg/output/svg_output_grammars.hpp>
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#include <mapnik/svg/output/svg_output_attributes.hpp>
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#include <mapnik/symbolizer_dispatch.hpp>
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#include <mapnik/vertex_processor.hpp>
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#include <mapnik/geometry_transform.hpp>
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#include <mapnik/geometry_to_path.hpp>
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#include <mapnik/util/geometry_to_ds_type.hpp>
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#include <mapnik/safe_cast.hpp>
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// boost
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#include <boost/spirit/include/karma.hpp>
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namespace mapnik { namespace geometry {
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template <typename CalculationType>
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struct coord_transformer
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{
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using calc_type = CalculationType;
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coord_transformer(view_transform const& tr, proj_transform const& prj_trans)
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: tr_(tr), prj_trans_(prj_trans) {}
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template <typename P1, typename P2>
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inline bool apply(P1 const& p1, P2 & p2) const
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{
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using coordinate_type = typename boost::geometry::coordinate_type<P2>::type;
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calc_type x = boost::geometry::get<0>(p1);
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calc_type y = boost::geometry::get<1>(p1);
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calc_type z = 0.0;
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if (!prj_trans_.backward(x, y, z)) return false;
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tr_.forward(&x,&y);
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boost::geometry::set<0>(p2, safe_cast<coordinate_type>(x));
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boost::geometry::set<1>(p2, safe_cast<coordinate_type>(y));
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return true;
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}
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view_transform const& tr_;
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proj_transform const& prj_trans_;
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};
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} // ns geometry
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struct symbol_type_dispatch
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{
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template <typename Symbolizer>
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bool operator()(Symbolizer const&) const
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{
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return false;
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}
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bool operator()(line_symbolizer const&) const
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{
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return true;
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}
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bool operator()(polygon_symbolizer const&) const
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{
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return true;
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}
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};
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bool is_path_based(symbolizer const& sym)
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{
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return util::apply_visitor(symbol_type_dispatch(), sym);
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}
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template <typename OutputIterator, typename PathType>
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void generate_path_impl(OutputIterator & output_iterator, PathType const& path, svg::path_output_attributes const& path_attributes)
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{
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using path_dash_array_grammar = svg::svg_path_dash_array_grammar<OutputIterator>;
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using path_attributes_grammar = svg::svg_path_attributes_grammar<OutputIterator>;
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static const path_attributes_grammar attributes_grammar;
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static const path_dash_array_grammar dash_array_grammar;
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static const svg::svg_path_generator<OutputIterator,PathType> svg_path_grammer;
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boost::spirit::karma::lit_type lit;
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boost::spirit::karma::generate(output_iterator, lit("<path ") << svg_path_grammer, path);
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boost::spirit::karma::generate(output_iterator, lit(" ") << dash_array_grammar, path_attributes.stroke_dasharray());
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boost::spirit::karma::generate(output_iterator, lit(" ") << attributes_grammar << lit("/>\n"), path_attributes);
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}
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template <typename OutputIterator>
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bool svg_renderer<OutputIterator>::process(rule::symbolizers const& syms,
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mapnik::feature_impl & feature,
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proj_transform const& prj_trans)
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{
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// svg renderer supports processing of multiple symbolizers.
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using trans_path_type = transform_path_adapter<view_transform, vertex_adapter>;
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bool process_path = false;
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// process each symbolizer to collect its (path) information.
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// path information (attributes from line_ and polygon_ symbolizers)
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// is collected with the path_attributes_ data member.
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for (auto const& sym : syms)
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{
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if (is_path_based(sym))
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{
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process_path = true;
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}
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util::apply_visitor(symbolizer_dispatch<svg_renderer<OutputIterator>>(*this, feature, prj_trans), sym);
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}
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if (process_path)
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{
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// generate path output for each geometry of the current feature.
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auto const& geom = feature.get_geometry();
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path_type path;
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path.set_type(static_cast<path_type::types>(mapnik::util::to_ds_type(geom)));
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geometry::to_path(geom, path);
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vertex_adapter va(path);
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trans_path_type trans_path(common_.t_, va, prj_trans);
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generate_path_impl(generator_.output_iterator_, trans_path, path_attributes_);
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// set the previously collected values back to their defaults
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// for the feature that will be processed next.
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path_attributes_.reset();
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}
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return true;
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}
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template bool svg_renderer<std::ostream_iterator<char> >::process(rule::symbolizers const& syms,
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mapnik::feature_impl & feature,
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proj_transform const& prj_trans);
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}
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#endif
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