# HG changeset patch
# User ladanyi
# Date 1125059854 0
# Node ID 6eb2f0f3bab9bbc92214f19dc30f33f307c3622b
# Parent  e40c41eae31f6cfe3ef03f0a47b9dbab039cb5a5
Display the node's coordinates while moving it.

diff -r e40c41eae31f -r 6eb2f0f3bab9 gui/graph_displayer_canvas-event.cc
--- a/gui/graph_displayer_canvas-event.cc	Fri Aug 26 11:37:41 2005 +0000
+++ b/gui/graph_displayer_canvas-event.cc	Fri Aug 26 12:37:34 2005 +0000
@@ -86,6 +86,7 @@
 
 bool GraphDisplayerCanvas::moveEventHandler(GdkEvent* e)
 {
+  static Gnome::Canvas::Text *coord_text = 0;
   switch(e->type)
   {
     case GDK_BUTTON_PRESS:
@@ -112,6 +113,11 @@
 	}
       break;
     case GDK_BUTTON_RELEASE:
+      if (coord_text)
+      {
+        delete coord_text;
+        coord_text = 0;
+      }
       isbutton=0;
       active_item=NULL;
       active_node=INVALID;
@@ -121,7 +127,7 @@
       if(active_node!=INVALID)
       {
         mapstorage.modified = true;
-        mapstorage.coords.set(active_node, xy<double>(clicked_x, clicked_y));
+
 	//new coordinates will be the old values,
 	//because the item will be moved to the
 	//new coordinate therefore the new movement
@@ -138,10 +144,42 @@
         active_item->move(dx, dy);
 	nodetextmap[active_node]->move(dx, dy);
 
+        // the new coordinates of the centre of the node 
+        double coord_x = new_x - (clicked_x - mapstorage.coords[active_node].x);
+        double coord_y = new_y - (clicked_y - mapstorage.coords[active_node].y);
+
         clicked_x=new_x;
         clicked_y=new_y;
 
+        // write back the new coordinates to the coords map
+        mapstorage.coords.set(active_node, xy<double>(coord_x, coord_y));
 
+        // reposition the coordinates text
+        std::ostringstream ostr;
+        ostr << "(" <<
+          mapstorage.coords[active_node].x << ", " <<
+          mapstorage.coords[active_node].y << ")";
+        if (coord_text)
+        {
+          coord_text->property_text().set_value(ostr.str());
+          coord_text->property_x().set_value(mapstorage.coords[active_node].x +
+              node_property_defaults[N_RADIUS] + 40);
+          coord_text->property_y().set_value(mapstorage.coords[active_node].y +
+              node_property_defaults[N_RADIUS] - 40);
+        }
+        else
+        {
+          coord_text = new Gnome::Canvas::Text(
+              displayed_graph,
+              mapstorage.coords[active_node].x +
+              node_property_defaults[N_RADIUS] + 40,
+              mapstorage.coords[active_node].y +
+              node_property_defaults[N_RADIUS] - 40,
+              ostr.str());
+          coord_text->property_fill_color().set_value("black");
+        }
+
+	//all the edges connected to the moved point has to be redrawn
         for(OutEdgeIt ei(mapstorage.graph,active_node);ei!=INVALID;++ei)
         {
             Gnome::Canvas::Points coos;