live23 x viitemuuttujaksi

luennot/live23/Pallot/Pallot.cs

@@ -15,9 +15,9 @@ public class Pallot : PhysicsGame
         double x = -200;
 
         PhysicsObject p = Luo(this, 100, 100);
-        pallo = Lisaa(this, x += 100);
+        pallo = Lisaa(this, ref x);
         pallo.Color = Color.Yellow;
-        pallo = Lisaa(this, x += 100);
+        pallo = Lisaa(this, ref x);
         Vaihda(pallo, Color.Red);
         Keyboard.Listen(Key.Escape, ButtonState.Pressed, ConfirmExit, "Lopeta peli");
     }
@@ -29,9 +29,9 @@ public class Pallot : PhysicsGame
     }
 
 
-    public static PhysicsObject Lisaa(Pallot peli, double x)
+    public static PhysicsObject Lisaa(Pallot peli, ref double x)
     {
-        // x += 100;
+        x += 100;
         return Luo(peli, x, -200);
     }