Working model drag with connecting lines

classes/canvas/canvas_element.xml

@@ -94,7 +94,7 @@
                     delta_x = self.original_coords[0] - self.last_x
                     delta_y = self.original_coords[1] - self.last_y
 
-                    self.coordinates = self.coordinates[0] + delta_x, self.coordinates[1] + delta_y
+                    self.coordinates = self.coordinates[0] - delta_x, self.coordinates[1] - delta_y
                     self.to_update = dict(self.elements)
                 </script>
             </transition>

frontend.py

@@ -1,7 +1,7 @@
 """
 Generated by Statechart compiler by Glenn De Jonghe, Joeri Exelmans, Simon Van Mierlo, and Yentl Van Tendeloo (for the inspiration)
 
-Date:   Fri Sep 15 10:41:28 2017
+Date:   Fri Sep 15 11:05:03 2017
 
 Model author: Yentl Van Tendeloo and Addis Gebremichael
 Model name:   Modelverse Visual Editor - Tkinter Version 
@@ -5977,7 +5977,7 @@ class CanvasElement(RuntimeClassBase, SCCDWidget):
         delta_x = self.original_coords[0] - self.last_x
         delta_y = self.original_coords[1] - self.last_y
         
-        self.coordinates = self.coordinates[0] + delta_x, self.coordinates[1] + delta_y
+        self.coordinates = self.coordinates[0] - delta_x, self.coordinates[1] - delta_y
         self.to_update = dict(self.elements)
     
     def _dragging_1_guard(self, parameters):