sij/mapnik
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

PostGIS vectors reduction, XML parameter driven (#1136)

Browse source
This commit is contained in:
Sandro Santilli 2012-04-17 17:03:20 +02:00
parent f76fde32b9
commit f7c5e69315
1 changed files with 22 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

23
plugins/input/postgis/postgis_datasource.cpp
View file

@ -606,8 +606,29 @@ featureset_ptr postgis_datasource::features(const query& q) const
throw mapnik::datasource_exception(s_error.str());
}
boost::optional<mapnik::boolean> simplify_opt =
params_.get<mapnik::boolean>("simplify", false);
bool simplify = simplify_opt && *simplify_opt;
std::ostringstream s;
s << "SELECT ST_AsBinary(\"" << geometryColumn_ << "\") AS geom";
s << "SELECT ST_AsBinary(";
if (simplify) {
s << "ST_Simplify(";
}
s << "\"" << geometryColumn_ << "\"";
if (simplify) {
double px_gw = 1.0/boost::get<0>(q.resolution());
double px_gh = 1.0/boost::get<1>(q.resolution());
double tolerance = std::min(px_gw,px_gh) / 2;
s << ", " << tolerance << ")";
}
s << ") AS geom";
mapnik::context_ptr ctx = boost::make_shared<mapnik::context_type>();
std::set<std::string> const& props = q.property_names();