luento23 loppu

luennot/live23/Pallot/Pallot.cs

@@ -3,32 +3,27 @@ namespace Pallot;
 
 public class Pallot : PhysicsGame
 {
-    private PhysicsObject pallo;
-    private double x = -200;
-
     public override void Begin()
     {
-        PhysicsObject p = Luo(this, 100, 100);
-        Lisaa();
+        PhysicsObject pallo;
+        double x = -200;
+        Luo(this, 100, 100);
+        (pallo, x) = Lisaa(this, x);
         pallo.Color = Color.Yellow;
-        Lisaa();
-        Vaihda(Color.Red);
+        (pallo, _) = Lisaa(this, x);
+        Vaihda(pallo, Color.Red);
         Keyboard.Listen(Key.Escape, ButtonState.Pressed, ConfirmExit, "Lopeta peli");
     }
-
-
-    public void Vaihda(Color c)
+    public static void Vaihda(PhysicsObject pallo, Color c)
     {
         pallo.Color = c;
     }
-
-
-    public void Lisaa()
+    public static (PhysicsObject, double) Lisaa(Pallot peli, double x)
     {
-        pallo = Luo(this, x += 100, -200);
+        double uusi_x = x + 100;
+        PhysicsObject p = Luo(peli, uusi_x, -200);
+        return (p, uusi_x);
     }
-
-
     public static PhysicsObject Luo(Game peli, double x, double y)
     {
         PhysicsObject o = new PhysicsObject(70, 70, Shape.Circle);