diff -r 40f3006fba2e -r a96d2a540454 graph_displayer_canvas-edge.cc
--- a/graph_displayer_canvas-edge.cc	Mon Oct 30 14:57:48 2006 +0000
+++ b/graph_displayer_canvas-edge.cc	Mon Oct 30 15:43:13 2006 +0000
@@ -76,7 +76,7 @@
     {
       for (EdgeIt i((mytab.mapstorage).graph); i!=INVALID; ++i)
 	{
-	  double v=fabs((*actual_map)[i]);
+	  double v=(*actual_map)[i];
 	  int w;
 	  if(autoscale)
 	    {
@@ -93,16 +93,24 @@
 	    {
 	      w=(int)(v*edge_width);
 	    }
-	  if(w<minimum_edge_width)
+	  if(w<0)
 	    {
-	      w=minimum_edge_width;
+	      edgesmap[i]->hide();
 	    }
-	  if(zoomtrack)
+	  else
 	    {
-	      double actual_ppu=get_pixels_per_unit();
-	      w=(int)(w/actual_ppu*fixed_zoom_factor);
+	      edgesmap[i]->show();
+	      if(w<minimum_edge_width)
+		{
+		  w=minimum_edge_width;
+		}
+	      if(zoomtrack)
+		{
+		  double actual_ppu=get_pixels_per_unit();
+		  w=(int)(w/actual_ppu*fixed_zoom_factor);
+		}
+	      edgesmap[i]->setLineWidth(w);
 	    }
-	  edgesmap[i]->setLineWidth(w);
 	}
     }
   else