remove others; added proper readback calc

phases/full_polarization.py

@@ -178,14 +178,6 @@ class UndShiftQuadrants(Adjustable):
         inverted_opposites = {v: k for k, v in opposites.items()}
         opposites.update(inverted_opposites)
 
-        self.others = others = {
-            "TL": "BL",
-            "TR": "BR"
-        }
-
-        inverted_others = {v: k for k, v in others.items()}
-        others.update(inverted_others)
-
 
         self.all_names = names = opposites.keys()
         pvnames = [f"{ID}-{n}" for n in names]
@@ -222,9 +214,8 @@ class UndShiftQuadrants(Adjustable):
 
 
     def get_current_value(self):
-        vals = [self.adjs.__dict__[n].get_current_value() for n in self.all_names]
-        print(vals)
-        return max(vals) #TODO: this is not final
+        d = self.adjs.__dict__
+        return d["TL"].get_current_value() - d["TR"].get_current_value()
 
     def is_moving(self):
         return any(a.is_moving() for a in self.adjs)