bool svg_renderer<OutputIterator>::process(rule::symbolizers const& syms,
Feature const& feature,
proj_transform const& prj_trans)
{
// svg renderer supports processing of multiple symbolizers.
typedef coord_transform<CoordTransform, geometry_type> path_type;
// process each symbolizer to collect its (path) information.
// path information (attributes from line_ and polygon_ symbolizers)
// is collected with the path_attributes_ data member.
BOOST_FOREACH(symbolizer const& sym, syms)
{
boost::apply_visitor(symbol_dispatch(*this, feature, prj_trans), sym);
}
bool svg_renderer<OutputIterator>::process(rule::symbolizers const& syms,
mapnik::feature_impl & feature,
proj_transform const& prj_trans)
{
// svg renderer supports processing of multiple symbolizers.
typedef coord_transform<CoordTransform, geometry_type> path_type;
bool process_path = false;
// process each symbolizer to collect its (path) information.
// path information (attributes from line_ and polygon_ symbolizers)
// is collected with the path_attributes_ data member.
for (symbolizer const& sym : syms)
{
if (is_path_based(sym))
{
process_path = true;
}
boost::apply_visitor(symbol_dispatch(*this, feature, prj_trans), sym);
}
if (process_path)
{
// generate path output for each geometry of the current feature.
for(std::size_t i=0; i<feature.num_geometries(); ++i)
{
geometry_type & geom = feature.get_geometry(i);
if(geom.size() > 0)
{
path_type path(t_, geom, prj_trans);
generator_.generate_path(path, path_attributes_);
}
}
// set the previously collected values back to their defaults
// for the feature that will be processed next.
path_attributes_.reset();
}
return true;
}
void apply_to_layer(Layer const& lay,Processor & p)
{
p.start_layer_processing(lay);
datasource *ds=lay.datasource().get();
if (ds)
{
Envelope<double> const& bbox=m_.getCurrentExtent();
double scale = m_.scale();
std::vector<std::string> const& style_names = lay.styles();
std::vector<std::string>::const_iterator stylesIter = style_names.begin();
while (stylesIter != style_names.end())
{
std::set<std::string> names;
attribute_collector<Feature> collector(names);
std::vector<rule_type*> if_rules;
std::vector<rule_type*> else_rules;
bool active_rules=false;
feature_type_style const& style=m_.find_style(*stylesIter++);
const std::vector<rule_type>& rules=style.get_rules();
std::vector<rule_type>::const_iterator ruleIter=rules.begin();
query q(bbox,m_.getWidth(),m_.getHeight());
while (ruleIter!=rules.end())
{
if (ruleIter->active(scale))
{
active_rules=true;
ruleIter->accept(collector);
if (ruleIter->has_else_filter())
{
else_rules.push_back(const_cast<rule_type*>(&(*ruleIter)));
}
else
{
if_rules.push_back(const_cast<rule_type*>(&(*ruleIter)));
}
}
++ruleIter;
}
std::set<std::string>::const_iterator namesIter=names.begin();
// push all property names
while (namesIter!=names.end())
{
q.add_property_name(*namesIter);
++namesIter;
}
if (active_rules)
{
featureset_ptr fs=ds->features(q);
if (fs)
{
feature_ptr feature;
while ((feature = fs->next()))
{
bool do_else=true;
std::vector<rule_type*>::const_iterator itr=if_rules.begin();
while (itr!=if_rules.end())
{
filter_ptr const& filter=(*itr)->get_filter();
if (filter->pass(*feature))
{
do_else=false;
const symbolizers& symbols = (*itr)->get_symbolizers();
symbolizers::const_iterator symIter=symbols.begin();
while (symIter!=symbols.end())
{
boost::apply_visitor(symbol_dispatch(p,*feature),*symIter++);
}
}
++itr;
}
if (do_else)
{
//else filter
std::vector<rule_type*>::const_iterator itr=else_rules.begin();
while (itr != else_rules.end())
{
const symbolizers& symbols = (*itr)->get_symbolizers();
symbolizers::const_iterator symIter=symbols.begin();
while (symIter!=symbols.end())
{
boost::apply_visitor(symbol_dispatch(p,*feature),*symIter++);
}
++itr;
}
}
}
}
}
}
}
p.end_layer_processing(lay);
}
void feature_style_processor<Processor>::render_style(
Processor & p,
feature_type_style const* style,
rule_cache const& rc,
featureset_ptr features,
proj_transform const& prj_trans)
{
p.start_style_processing(*style);
if (!features)
{
p.end_style_processing(*style);
return;
}
mapnik::attributes vars = p.variables();
feature_ptr feature;
bool was_painted = false;
while ((feature = features->next()))
{
bool do_else = true;
bool do_also = false;
for (rule const* r : rc.get_if_rules() )
{
expression_ptr const& expr = r->get_filter();
value_type result = boost::apply_visitor(evaluate<feature_impl,value_type,attributes>(*feature,vars),*expr);
if (result.to_bool())
{
was_painted = true;
do_else=false;
do_also=true;
rule::symbolizers const& symbols = r->get_symbolizers();
if(!p.process(symbols,*feature,prj_trans))
{
for (symbolizer const& sym : symbols)
{
boost::apply_visitor(symbol_dispatch(p,*feature,prj_trans),sym);
}
}
if (style->get_filter_mode() == FILTER_FIRST)
{
// Stop iterating over rules and proceed with next feature.
do_also=false;
break;
}
}
}
if (do_else)
{
for( rule const* r : rc.get_else_rules() )
{
was_painted = true;
rule::symbolizers const& symbols = r->get_symbolizers();
if(!p.process(symbols,*feature,prj_trans))
{
for (symbolizer const& sym : symbols)
{
boost::apply_visitor(symbol_dispatch(p,*feature,prj_trans),sym);
}
}
}
}
if (do_also)
{
for( rule const* r : rc.get_also_rules() )
{
was_painted = true;
rule::symbolizers const& symbols = r->get_symbolizers();
if(!p.process(symbols,*feature,prj_trans))
{
for (symbolizer const& sym : symbols)
{
boost::apply_visitor(symbol_dispatch(p,*feature,prj_trans),sym);
}
}
}
}
}
p.painted(was_painted);
p.end_style_processing(*style);
}