256 lines
7.8 KiB
C++
256 lines
7.8 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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//$Id$
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#ifndef FEATURE_STYLE_PROCESSOR_HPP
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#define FEATURE_STYLE_PROCESSOR_HPP
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// mapnik
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#include <mapnik/box2d.hpp>
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#include <mapnik/datasource.hpp>
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#include <mapnik/layer.hpp>
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#include <mapnik/map.hpp>
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#include <mapnik/attribute_collector.hpp>
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#include <mapnik/expression_evaluator.hpp>
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#include <mapnik/utils.hpp>
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#include <mapnik/projection.hpp>
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#include <mapnik/scale_denominator.hpp>
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#ifdef MAPNIK_DEBUG
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//#include <mapnik/wall_clock_timer.hpp>
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#endif
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//stl
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#include <vector>
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namespace mapnik
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{
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template <typename Processor>
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class feature_style_processor
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{
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struct symbol_dispatch : public boost::static_visitor<>
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{
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symbol_dispatch (Processor & output,
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Feature const& f,
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proj_transform const& prj_trans)
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: output_(output),
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f_(f),
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prj_trans_(prj_trans) {}
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template <typename T>
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void operator () (T const& sym) const
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{
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output_.process(sym,f_,prj_trans_);
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}
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Processor & output_;
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Feature const& f_;
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proj_transform const& prj_trans_;
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};
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public:
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feature_style_processor(Map const& m)
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: m_(m) {}
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void apply()
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{
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#ifdef MAPNIK_DEBUG
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//mapnik::wall_clock_progress_timer t(std::clog, "map rendering took: ");
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#endif
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Processor & p = static_cast<Processor&>(*this);
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p.start_map_processing(m_);
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try
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{
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projection proj(m_.srs()); // map projection
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double scale_denom = mapnik::scale_denominator(m_,proj.is_geographic());
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#ifdef MAPNIK_DEBUG
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std::clog << "scale denominator = " << scale_denom << "\n";
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#endif
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std::vector<layer>::const_iterator itr = m_.layers().begin();
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std::vector<layer>::const_iterator end = m_.layers().end();
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while (itr != end)
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{
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if (itr->isVisible(scale_denom))
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{
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apply_to_layer(*itr, p, proj, scale_denom);
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}
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++itr;
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}
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}
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catch (proj_init_error& ex)
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{
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std::clog << "proj_init_error:" << ex.what() << "\n";
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}
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p.end_map_processing(m_);
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}
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private:
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void apply_to_layer(layer const& lay, Processor & p,
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projection const& proj0,double scale_denom)
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{
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#ifdef MAPNIK_DEBUG
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//wall_clock_progress_timer timer(clog, "end layer rendering: ");
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#endif
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p.start_layer_processing(lay);
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boost::shared_ptr<datasource> ds=lay.datasource();
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if (ds)
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{
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box2d<double> ext = m_.get_buffered_extent();
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projection proj1(lay.srs());
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proj_transform prj_trans(proj0,proj1);
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box2d<double> layer_ext = lay.envelope();
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double lx0 = layer_ext.minx();
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double ly0 = layer_ext.miny();
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double lz0 = 0.0;
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double lx1 = layer_ext.maxx();
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double ly1 = layer_ext.maxy();
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double lz1 = 0.0;
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// back project layers extent into main map projection
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prj_trans.backward(lx0,ly0,lz0);
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prj_trans.backward(lx1,ly1,lz1);
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// if no intersection then nothing to do for layer
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if ( lx0 > ext.maxx() || lx1 < ext.minx() || ly0 > ext.maxy() || ly1 < ext.miny() )
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{
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return;
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}
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// clip query bbox
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lx0 = std::max(ext.minx(),lx0);
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ly0 = std::max(ext.miny(),ly0);
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lx1 = std::min(ext.maxx(),lx1);
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ly1 = std::min(ext.maxy(),ly1);
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prj_trans.forward(lx0,ly0,lz0);
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prj_trans.forward(lx1,ly1,lz1);
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box2d<double> bbox(lx0,ly0,lx1,ly1);
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query::resolution_type res(m_.getWidth()/m_.getCurrentExtent().width(),m_.getHeight()/m_.getCurrentExtent().height());
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query q(bbox,res,scale_denom); //BBOX query
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std::vector<std::string> const& style_names = lay.styles();
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std::vector<std::string>::const_iterator stylesIter = style_names.begin();
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std::vector<std::string>::const_iterator stylesEnd = style_names.end();
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for (;stylesIter != stylesEnd; ++stylesIter)
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{
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std::set<std::string> names;
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attribute_collector collector(names);
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std::vector<rule_type*> if_rules;
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std::vector<rule_type*> else_rules;
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bool active_rules=false;
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boost::optional<feature_type_style const&> style=m_.find_style(*stylesIter);
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if (!style) continue;
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const std::vector<rule_type>& rules=(*style).get_rules();
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std::vector<rule_type>::const_iterator ruleIter=rules.begin();
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std::vector<rule_type>::const_iterator ruleEnd=rules.end();
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for (;ruleIter!=ruleEnd;++ruleIter)
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{
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if (ruleIter->active(scale_denom))
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{
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active_rules=true;
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// collect unique attribute names
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collector(*ruleIter);
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if (ruleIter->has_else_filter())
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{
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else_rules.push_back(const_cast<rule_type*>(&(*ruleIter)));
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}
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else
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{
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if_rules.push_back(const_cast<rule_type*>(&(*ruleIter)));
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}
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}
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}
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std::set<std::string>::const_iterator namesIter=names.begin();
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std::set<std::string>::const_iterator namesEnd =names.end();
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// push all property names
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for (;namesIter!=namesEnd;++namesIter)
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{
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q.add_property_name(*namesIter);
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}
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if (active_rules)
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{
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featureset_ptr fs=ds->features(q);
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if (fs)
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{
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feature_ptr feature;
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while ((feature = fs->next()))
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{
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bool do_else=true;
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std::vector<rule_type*>::const_iterator itr=if_rules.begin();
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std::vector<rule_type*>::const_iterator end=if_rules.end();
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for (;itr != end;++itr)
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{
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expression_ptr const& expr=(*itr)->get_filter();
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value_type result = boost::apply_visitor(evaluate<Feature,value_type>(*feature),*expr);
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if (result.to_bool())
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{
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do_else=false;
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const rule_type::symbolizers& symbols = (*itr)->get_symbolizers();
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rule_type::symbolizers::const_iterator symIter=symbols.begin();
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rule_type::symbolizers::const_iterator symEnd =symbols.end();
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for (;symIter != symEnd;++symIter)
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{
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boost::apply_visitor
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(symbol_dispatch(p,*feature,prj_trans),*symIter);
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}
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}
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}
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if (do_else)
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{
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//else filter
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std::vector<rule_type*>::const_iterator itr=
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else_rules.begin();
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std::vector<rule_type*>::const_iterator end=
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else_rules.end();
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for (;itr != end;++itr)
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{
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const rule_type::symbolizers& symbols = (*itr)->get_symbolizers();
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rule_type::symbolizers::const_iterator symIter= symbols.begin();
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rule_type::symbolizers::const_iterator symEnd = symbols.end();
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for (;symIter!=symEnd;++symIter)
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{
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boost::apply_visitor
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(symbol_dispatch(p,*feature,prj_trans),*symIter);
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}
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}
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}
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}
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}
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}
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}
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}
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p.end_layer_processing(lay);
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}
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Map const& m_;
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};
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}
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#endif //FEATURE_STYLE_PROCESSOR_HPP
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