C++ (Cpp) layer::buffer_size Exemples

Exemple #1

Fichier : grid_renderer.cpp Projet : LeadsPlus/mapnik

void grid_renderer<T>::start_layer_processing(layer const& lay, box2d<double> const& query_extent)
{
    MAPNIK_LOG_DEBUG(grid_renderer) << "grid_renderer: Start processing layer=" << lay.name();
    MAPNIK_LOG_DEBUG(grid_renderer) << "grid_renderer: datasource=" << lay.datasource().get();
    MAPNIK_LOG_DEBUG(grid_renderer) << "grid_renderer: query_extent = " << query_extent;

    if (lay.clear_label_cache())
    {
        detector_->clear();
    }
    query_extent_ = query_extent;
    int buffer_size = lay.buffer_size();
    if (buffer_size != 0 )
    {
        double padding = buffer_size * (double)(query_extent.width()/pixmap_.width());
        double x0 = query_extent_.minx();
        double y0 = query_extent_.miny();
        double x1 = query_extent_.maxx();
        double y1 = query_extent_.maxy();
        query_extent_.init(x0 - padding, y0 - padding, x1 + padding , y1 + padding);
    }

    boost::optional<box2d<double> > const& maximum_extent = lay.maximum_extent();
    if (maximum_extent)
    {
        query_extent_.clip(*maximum_extent);
    }
}