DRAWDIRECTEDEDGES Draw edges with arrow indicating direction.
 
   usage:
   drawDirectedEdges(NODES, EDGES);

   drawDirectedEdges(NODES, EDGES, STYLE);
   specifies style of arrrows. Can be one of:
   'left'
   'right'
   'arrow'
   'triangle'
   'fill'

   drawDirectedEdges(NODES, EDGES, STYLE, DIRECT) : also specify the base
   direction of all edges. DIRECT is true by default. If DIRECT is false
   all edges are inverted.
   
   H = drawDirectedEdges(NODES, EDGES) : return handles to each of the
   lines created.

   TODO: now only style 'arrow' is implemented ...

   -----

   author : David Legland 
   INRA - TPV URPOI - BIA IMASTE
   created the 12/03/2003.

Package: matgeom