コード例 #1
0
void render_layer_for_grid(mapnik::Map const& map,
                                  mapnik::grid & grid,
                                  unsigned layer_idx,
                                  boost::python::list const& fields,
                                  double scale_factor,
                                  unsigned offset_x,
                                  unsigned offset_y)
{
    std::vector<mapnik::layer> const& layers = map.layers();
    std::size_t layer_num = layers.size();
    if (layer_idx >= layer_num) {
        std::ostringstream s;
        s << "Zero-based layer index '" << layer_idx << "' not valid, only '"
          << layer_num << "' layers are in map\n";
        throw std::runtime_error(s.str());
    }

    // convert python list to std::set
    boost::python::ssize_t num_fields = boost::python::len(fields);
    for(boost::python::ssize_t i=0; i<num_fields; i++) {
        boost::python::extract<std::string> name(fields[i]);
        if (name.check())
        {
            grid.add_field(name());
        }
        else
        {
            std::stringstream s;
            s << "list of field names must be strings";
            throw mapnik::value_error(s.str());
        }
    }

    // copy field names
    std::set<std::string> attributes = grid.get_fields();
    // todo - make this a static constant
    std::string known_id_key = "__id__";
    if (attributes.find(known_id_key) != attributes.end())
    {
        attributes.erase(known_id_key);
    }

    std::string join_field = grid.get_key();
    if (known_id_key != join_field &&
        attributes.find(join_field) == attributes.end())
    {
        attributes.insert(join_field);
    }

    mapnik::grid_renderer<mapnik::grid> ren(map,grid,scale_factor,offset_x,offset_y);
    mapnik::layer const& layer = layers[layer_idx];
    ren.apply(layer,attributes);
}
コード例 #2
0
ファイル: mapnik_python.cpp プロジェクト: chillycher/mapnik
void render_layer2(const mapnik::Map& map,
                   mapnik::image_32& image,
                   unsigned layer_idx)
{
    std::vector<mapnik::layer> const& layers = map.layers();
    std::size_t layer_num = layers.size();
    if (layer_idx >= layer_num) {
        std::ostringstream s;
        s << "Zero-based layer index '" << layer_idx << "' not valid, only '"
          << layer_num << "' layers are in map\n";
        throw std::runtime_error(s.str());
    }

    python_unblock_auto_block b;
    mapnik::layer const& layer = layers[layer_idx];
    mapnik::agg_renderer<mapnik::image_32> ren(map,image,1.0,0,0);
    std::set<std::string> names;
    ren.apply(layer,names);
}
コード例 #3
0
void render_layer2(mapnik::Map const& map,
                   mapnik::image_any& image,
                   unsigned layer_idx,
                   double scale_factor,
                   unsigned offset_x,
                   unsigned offset_y)
{
    std::vector<mapnik::layer> const& layers = map.layers();
    std::size_t layer_num = layers.size();
    if (layer_idx >= layer_num) {
        std::ostringstream s;
        s << "Zero-based layer index '" << layer_idx << "' not valid, only '"
          << layer_num << "' layers are in map\n";
        throw std::runtime_error(s.str());
    }

    python_unblock_auto_block b;
    mapnik::layer const& layer = layers[layer_idx];
    std::set<std::string> names;
    mapnik::util::apply_visitor(agg_renderer_visitor_4(map, scale_factor, offset_x, offset_y, layer, names), image);
}