#include <LEDA/graphics/graphwin.h>
using namespace leda;

int main()
{
  graph G;
  GraphWin gw(G, "Kurs 1");

  gw.set_node_label_type(no_label);
  gw.set_edge_direction(undirected_edge);
  gw.display();

  while(gw.edit())
    {
      gw.set_node_color(ivory);
      gw.set_node_shape(circle_node);
      gw.set_edge_width(1);

      node v = G.choose_node();
      gw.set_color(v,blue);

      node w = gw.ask_node();

      edge e;
      forall_inout_edges(e,w)
	{
	  gw.set_width(e,5);
	  node u = G.opposite(w,e);
	  gw.set_shape(u,square_node);
	}
    }

  return 0;
}