4d4e9f5d91
to be rendered. This allows for a large extent (larger than can be
rendered into a single image in memory) to be rendered out as tiles.
Since the full extent is used for the placement calculations text
crossing tile boundaries will be consistent.
This method is a little inefficient when a large number of labels need
placed, an improved method would be to cache these placements between
tiles, but the attached is a start.
c++ users should simple call the render method with a start X and Y
coordinate specified,
for (int TileX = 0;TileX < 5;++TileX)
{
for(int TileY = 0;TileY < 5; ++TileY)
{
int TileSize=250;
int StartX = TileX*TileSize;
int StartY = TileY*TileSize;
Image32 buf(TileSize,TileSize);
agg_renderer<Image32> ren(m,buf,StartX,StartY);
ren.apply();
char name[324];
sprintf(name,"tile_%d_%d.png",TileX,TileY);
ImageUtils::save_to_file(name,"png",buf);
}
}
python users should call render_tile_to_file
for y in range(tile_count_y):
for x in range(tile_count_x):
if not os.path.exists("tiles/%d/%d/" % (map_scale, y)):
os.makedirs("tiles/%d/%d/" % (map_scale, y))
render_tile_to_file(m, x*tile_size, y*tile_size, tile_size, tile_size,
'tiles/%d/%d/%d.png' % (map_scale,y,x), 'png')
118 lines
3.4 KiB
C++
118 lines
3.4 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2006 Artem Pavlenko, Jean-Francois Doyon
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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//$Id: mapnik_python.cc 27 2005-03-30 21:45:40Z pavlenko $
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#include <boost/python.hpp>
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#include <boost/get_pointer.hpp>
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#include <boost/python/detail/api_placeholder.hpp>
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void export_color();
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void export_coord();
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void export_layer();
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void export_parameters();
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void export_envelope();
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void export_query();
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void export_image();
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void export_image_view();
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void export_map();
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void export_python();
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void export_filter();
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void export_rule();
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void export_style();
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void export_stroke();
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void export_datasource();
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void export_datasource_cache();
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void export_point_symbolizer();
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void export_line_symbolizer();
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void export_line_pattern_symbolizer();
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void export_polygon_symbolizer();
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void export_polygon_pattern_symbolizer();
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void export_raster_symbolizer();
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void export_shield_symbolizer();
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void export_text_symbolizer();
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void export_font_engine();
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void export_projection();
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#include <mapnik/map.hpp>
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#include <mapnik/agg_renderer.hpp>
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#include <mapnik/graphics.hpp>
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#include <mapnik/load_map.hpp>
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#include <mapnik/save_map.hpp>
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void render_to_file(const mapnik::Map& map,
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const std::string& file,
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const std::string& format)
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{
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mapnik::Image32 image(map.getWidth(),map.getHeight());
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mapnik::agg_renderer<mapnik::Image32> ren(map,image);
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ren.apply();
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image.saveToFile(file,format);
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}
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void render(const mapnik::Map& map,mapnik::Image32& image)
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{
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mapnik::agg_renderer<mapnik::Image32> ren(map,image);
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ren.apply();
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}
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BOOST_PYTHON_MODULE(_mapnik)
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{
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using namespace boost::python;
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using mapnik::load_map;
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using mapnik::save_map;
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export_query();
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export_datasource();
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export_parameters();
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export_color();
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export_envelope();
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export_image();
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export_image_view();
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export_filter();
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export_rule();
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export_style();
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export_layer();
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export_stroke();
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export_datasource_cache();
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export_point_symbolizer();
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export_line_symbolizer();
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export_line_pattern_symbolizer();
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export_polygon_symbolizer();
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export_polygon_pattern_symbolizer();
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export_raster_symbolizer();
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export_shield_symbolizer();
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export_text_symbolizer();
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export_font_engine();
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export_projection();
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export_coord();
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export_map();
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def("render_to_file",&render_to_file);
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def("render",&render);
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def("load_map",&load_map,"load Map object from XML");
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def("save_map",&load_map,"sace Map object to XML");
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register_ptr_to_python<mapnik::filter_ptr>();
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}
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