mapnik/plugins/input/osm/render.cpp

#include <mapnik/map.hpp>
#include <mapnik/layer.hpp>
#include <mapnik/box2d.hpp>
#include <mapnik/agg_renderer.hpp>
#include <mapnik/image_util.hpp>
#include <mapnik/load_map.hpp>
#include <mapnik/datasource_cache.hpp>
#include <mapnik/font_engine_freetype.hpp>
#include <mapnik/projection.hpp>

using namespace mapnik;

#include <iostream>
#include <cmath>
using namespace std;


int main(int argc,char *argv[])
{
  if(argc < 6)
  {
    std::cerr<<"Usage: render XMLfile w s e n [OSMfile]" << std::endl;
    exit(0);
  }

  datasource_cache::instance()->register_datasources
    ("/usr/local/lib/mapnik/input");
  freetype_engine::register_font
    ("/usr/local/lib/mapnik/fonts/DejaVuSans.ttf");

  Map m (800,800);
  load_map(m,argv[1]);
  
  if(argc>6)
  {
    parameters p;
    p["type"] = "osm";
    p["file"] = argv[6];
    for(int count=0; count<m.layer_count(); count++)
    {
      parameters q = m.getLayer(count).datasource()->params();
      m.getLayer(count).set_datasource(datasource_cache::instance()->
        create(p));
    }
  }

  box2d<double> bbox (atof(argv[2]),atof(argv[3]),
              atof(argv[4]),atof(argv[5]));
                    
  m.zoom_to_box(bbox);

  image_32 buf (m.width(), m.height());
  agg_renderer<image_32> r(m,buf);
  r.apply();

  save_to_file<image_data_32>(buf.data(),"blah.png","png");

  return 0;
}