diff -r b1144bb36605 -r c70aefcadf66 graphics/GraphicCommons.py
--- a/graphics/GraphicCommons.py	Tue Apr 22 10:25:24 2008 +0200
+++ b/graphics/GraphicCommons.py	Tue Apr 22 16:16:00 2008 +0200
@@ -1183,6 +1183,7 @@
         self.Value = None
         self.OverStart = False
         self.OverEnd = False
+        self.ComputingType = False
     
     # Destructor of a wire
     def __del__(self):
@@ -1212,8 +1213,11 @@
     
     # Returns connector to which start point is connected
     def GetStartConnectedType(self):
-        if self.StartConnected:
-            return self.StartConnected.GetType()
+        if self.StartConnected and not self.ComputingType:
+            self.ComputingType = True
+            computed_type = self.StartConnected.GetType()
+            self.ComputingType = False
+            return computed_type
         return None
     
     # Returns connector to which end point is connected
@@ -1222,8 +1226,11 @@
     
     # Returns connector to which end point is connected
     def GetEndConnectedType(self):
-        if self.EndConnected:
-            return self.EndConnected.GetType()
+        if self.EndConnected and not self.ComputingType:
+            self.ComputingType = True
+            computed_type = self.EndConnected.GetType()
+            self.ComputingType = False
+            return computed_type
         return None
     
     def GetOtherConnected(self, connector):
@@ -1324,7 +1331,7 @@
                 miny, minbbxy = min(miny, self.Points[-1].y), min(minbbxy, self.Points[-1].y - end_radius)
                 maxy, maxbbxy = max(maxy, self.Points[-1].y), max(maxbbxy, self.Points[-1].y + end_radius)
             self.Pos.x, self.Pos.y = minx, miny
-            self.Size = wx.Size(maxx - minx + 1, maxy - miny + 1)
+            self.Size = wx.Size(maxx - minx, maxy - miny)
             self.BoundingBox = wx.Rect(minbbxx, minbbxy, maxbbxx - minbbxx + 1, maxbbxy - minbbxy + 1)
     
     # Refresh the realpoints that permits to keep the proportionality in wire during resizing
@@ -1652,10 +1659,10 @@
                         dir = self.EndPoint[1]
                     else:
                         dir = (0, 0)
-                    pointx = max(-dir[0] * MIN_SEGMENT_SIZE, min(int(round(point[0] * (width - 1) / float(lastwidth - 1))),
-                            width - dir[0] * MIN_SEGMENT_SIZE - 1))
-                    pointy = max(-dir[1] * MIN_SEGMENT_SIZE, min(int(round(point[1] * (height - 1) / float(lastheight - 1))),
-                            height - dir[1] * MIN_SEGMENT_SIZE - 1))
+                    pointx = max(-dir[0] * MIN_SEGMENT_SIZE, min(int(round(point[0] * width / float(max(lastwidth, 1)))),
+                            width - dir[0] * MIN_SEGMENT_SIZE))
+                    pointy = max(-dir[1] * MIN_SEGMENT_SIZE, min(int(round(point[1] * height / float(max(lastheight, 1)))),
+                            height - dir[1] * MIN_SEGMENT_SIZE))
                     self.Points[i] = wx.Point(minx + x + pointx, miny + y + pointy)
             self.StartPoint[0] = self.Points[0]
             self.EndPoint[0] = self.Points[-1]
@@ -1676,8 +1683,8 @@
             # duringa resize dragging
             for i, point in enumerate(self.RealPoints):
                 if not (i == 0 and self.StartConnected) and not (i == len(self.Points) - 1 and self.EndConnected):
-                    point[0] = point[0] * (width - 1) / float(lastwidth - 1)
-                    point[1] = point[1] * (height - 1) / float(lastheight - 1)
+                    point[0] = point[0] * width / float(max(lastwidth, 1))
+                    point[1] = point[1] * height / float(max(lastheight, 1))
             # Calculate the correct position of the points from real points
             for i, point in enumerate(self.RealPoints):
                 if not (i == 0 and self.StartConnected) and not (i == len(self.Points) - 1 and self.EndConnected):
@@ -1688,9 +1695,9 @@
                     else:
                         dir = (0, 0)
                     realpointx = max(-dir[0] * MIN_SEGMENT_SIZE, min(int(round(point[0])),
-                            width - dir[0] * MIN_SEGMENT_SIZE - 1))
+                            width - dir[0] * MIN_SEGMENT_SIZE))
                     realpointy = max(-dir[1] * MIN_SEGMENT_SIZE, min(int(round(point[1])),
-                            height - dir[1] * MIN_SEGMENT_SIZE - 1))
+                            height - dir[1] * MIN_SEGMENT_SIZE))
                     self.Points[i] = wx.Point(minx + x + realpointx, miny + y + realpointy)
             self.StartPoint[0] = self.Points[0]
             self.EndPoint[0] = self.Points[-1]