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svg_renderer: only process line/polygon symbolizers as <path> for now

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This commit is contained in:
Dane Springmeyer 2013-06-24 20:28:02 -07:00
parent d1f1104ebe
commit 4c4a63aa9c
1 changed files with 39 additions and 11 deletions
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50
src/svg/output/process_symbolizers.cpp
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@ -25,6 +25,28 @@
namespace mapnik {
struct symbol_type_dispatch : public boost::static_visitor<bool>
{
template <typename Symbolizer>
bool operator()(Symbolizer const& sym) const
{
return false;
}
bool operator()(line_symbolizer const& sym) const
{
return true;
}
bool operator()(polygon_symbolizer const& sym) const
{
return true;
}
};
bool is_path_based(symbolizer const& sym)
{
return boost::apply_visitor(symbol_type_dispatch(), sym);
}
template <typename OutputIterator>
bool svg_renderer<OutputIterator>::process(rule::symbolizers const& syms,
mapnik::feature_impl & feature,
@ -33,29 +55,35 @@ bool svg_renderer<OutputIterator>::process(rule::symbolizers const& syms,
// 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.
BOOST_FOREACH(symbolizer const& sym, syms)
{
if (is_path_based(sym))
{
process_path = true;
}
boost::apply_visitor(symbol_dispatch(*this, feature, prj_trans), sym);
}
// generate path output for each geometry of the current feature.
for(unsigned i=0; i<feature.num_geometries(); ++i)
if (process_path)
{
geometry_type & geom = feature.get_geometry(i);
if(geom.size() > 0)
// generate path output for each geometry of the current feature.
for(unsigned i=0; i<feature.num_geometries(); ++i)
{
path_type path(t_, geom, prj_trans);
generator_.generate_path(path, path_attributes_);
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();
}
// set the previously collected values back to their defaults
// for the feature that will be processed next.
path_attributes_.reset();
return true;
}