--- a/graphics/GraphicCommons.py	Wed Jan 30 09:52:57 2008 +0100
+++ b/graphics/GraphicCommons.py	Wed Jan 30 18:48:05 2008 +0100
@@ -488,7 +488,7 @@
                 self.Dragging = True
             # If a dragging have been initiated, refreshes the element state
             if self.Dragging:
-                dragx, dragy = self.ProcessDragging(movex, movey, scaling)
+                dragx, dragy = self.ProcessDragging(movex, movey, event.ShiftDown(), scaling)
                 self.oldPos.x += dragx
                 self.oldPos.y += dragy
                 return dragx, dragy
@@ -518,7 +518,7 @@
         self.SetSize(width, height)
     
     # Refreshes the element state according to move defined and handle selected
-    def ProcessDragging(self, movex, movey, scaling):
+    def ProcessDragging(self, movex, movey, centered, scaling):
         handle_type, handle = self.Handle
         # If it is a resize handle, calculate the values from resizing
         if handle_type == HANDLE_RESIZE:
@@ -529,21 +529,35 @@
                 if scaling is not None:
                     movex = round(float(self.Pos.x + movex) / float(scaling[0])) * scaling[0] - self.Pos.x
                 x = movex
-                width -= movex
+                if centered:
+                    width -= 2 * movex
+                else:
+                    width -= movex
             elif handle[0] == 3:
                 if scaling is not None:
                     movex = round(float(self.Pos.x + width + movex) / float(scaling[0])) * scaling[0] - self.Pos.x - width
-                width += movex
+                if centered:
+                    x = -movex
+                    width += 2 * movex
+                else:
+                    width += movex
             if handle[1] == 1:
                 movey = max(-self.BoundingBox.y, movey)
                 if scaling is not None:
                     movey = round(float(self.Pos.y + movey) / float(scaling[1])) * scaling[1] - self.Pos.y
                 y = movey
-                height -= movey
+                if centered:
+                    height -= 2 * movey
+                else:
+                    height -= movey
             elif handle[1] == 3:
                 if scaling is not None:
                     movey = round(float(self.Pos.y + height + movey) / float(scaling[1])) * scaling[1] - self.Pos.y - height
-                height += movey
+                if centered:
+                    y = -movey
+                    height += 2 * movey
+                else:
+                    height += movey
             # Verify that new size is not lesser than minimum
             min_width, min_height = self.GetMinSize()
             if handle[0] != 2 and (width >= min_width or width > self.Size[0]):
@@ -1912,7 +1926,7 @@
             return Graphic_Element.OnMotion(self, event, dc, scaling)
     
     # Refreshes the wire state according to move defined and handle selected
-    def ProcessDragging(self, movex, movey, scaling):
+    def ProcessDragging(self, movex, movey, centered, scaling):
         handle_type, handle = self.Handle
         # A point has been handled
         if handle_type == HANDLE_POINT:
@@ -1964,7 +1978,7 @@
             return self.MoveSegment(handle[0], movex, movey, scaling)
         # Execute the default method for a graphic element
         else:
-            return Graphic_Element.ProcessDragging(self, movex, movey, scaling)
+            return Graphic_Element.ProcessDragging(self, movex, movey, centered, scaling)
     
     # Refreshes the wire model
     def RefreshModel(self, move=True):