Feature: Adds lives system to Asteroids game.

Author: deanthecoder

G33kShell.Desktop/Console/Screensavers/AI/AiGameCanvasBase.cs

@@ -37,8 +37,6 @@ public abstract class AiGameCanvasBase : ScreensaverBase
     protected int ArenaWidth { get; }
     protected int ArenaHeight { get; }
 
-    protected abstract void DrawGame(ScreenData screen, AiGameBase game);
-
     protected AiGameCanvasBase(int width, int height, int targetFps = 30) : base(width, height, targetFps)
     {
         ArenaWidth = width;
@@ -99,7 +97,6 @@ private void TrainAiImpl(Action<byte[]> saveBrainBytes)
 
         // Persist brain improvements.
         AiBrainBase goatBrain = null;
-        var increaseMutation = false;
         if (veryBest.Rating > m_savedRating)
         {
             m_savedRating = veryBest.Rating;
@@ -114,13 +111,12 @@ private void TrainAiImpl(Action<byte[]> saveBrainBytes)
             m_generationsSinceImprovement++;
 
             m_currentPopSize = Math.Max(m_currentPopSize - 2, MinPopSize);
-            // if (m_generationsSinceImprovement >= 100)
-            // {
-            //     m_generationsSinceImprovement = 0;
-            //     m_currentPopSize = InitialPopSize;
-            //     //increaseMutation = true;
-            //     System.Console.WriteLine("Stagnation detected — Increasing population size.");
-            // }
+            if (m_generationsSinceImprovement >= 100)
+            {
+                m_generationsSinceImprovement = 0;
+                m_currentPopSize = InitialPopSize;
+                System.Console.WriteLine("Stagnation detected — Increasing population size.");
+            }
         }
 
         // Build the brains for the next generation.
@@ -136,12 +132,6 @@ private void TrainAiImpl(Action<byte[]> saveBrainBytes)
         // ...and 10% more with a small mutation.
         nextBrains.AddRange(eliteGames.Select(o => o.Brain.Clone().Mutate(0.02)));
 
-        if (increaseMutation)
-        {
-            // Fill 50% of the population with more mutations.
-            nextBrains.AddRange(orderedGames.Take(orderedGames.Length / 2).Select(o => o.Brain.Clone().Mutate(0.5)));
-        }
-
         // Spawn 5% pure randoms.
         nextBrains.AddRange(Enumerable.Range(0, (int)(m_currentPopSize * 0.05)).Select(_ => veryBest.Brain.Clone().Randomize()));
 

G33kShell.Desktop/Console/Screensavers/Asteroids/AsteroidsCanvas.cs

@@ -56,7 +56,7 @@ private void PlayGame(ScreenData screen)
             m_games[0].ResetGame();
     }
 
-    protected override void DrawGame(ScreenData screen, AiGameBase aiGame)
+    private void DrawGame(ScreenData screen, AiGameBase aiGame)
     {
         screen.Clear(Foreground, Background);
 

G33kShell.Desktop/Console/Screensavers/Asteroids/Game.cs

@@ -17,7 +17,7 @@
 
 namespace G33kShell.Desktop.Console.Screensavers.Asteroids;
 
-[DebuggerDisplay("Rating = {Rating}, Score = {Score}")]
+[DebuggerDisplay("Rating = {Rating}, Score = {Score}, Lives = {m_lives}")]
 public class Game : AiGameBase
 {
     private int m_bulletsFired;
@@ -26,6 +26,7 @@ public class Game : AiGameBase
     private int m_leftTurns;
     private int m_rightTurns;
     private GameState m_gameState;
+    private int m_lives = 3;
 
     /// <summary>
     /// Score used for public display.
@@ -38,7 +39,7 @@ public class Game : AiGameBase
         (1.0 - (double)Math.Abs(m_leftTurns - m_rightTurns) / (m_leftTurns + m_rightTurns + 1)) * 5.0 + // Reward not spinning.
         Score / 1000.0;                                                                                 // Reward score.
 
-    public override bool IsGameOver => Ship.Shield <= 0.0 || m_gameTicks > 200_000;
+    public override bool IsGameOver => m_lives == 0 || m_gameTicks > 200_000;
     public Ship Ship { get; private set; }
     public List<Asteroid> Asteroids { get; } = [];
     public List<Bullet> Bullets { get; } = [];
@@ -155,7 +156,18 @@ public override void Tick()
             var distance = Asteroids[i].DistanceTo(Ship.Position);
             if (distance < Asteroids[i].Radius + shipRadius)
             {
-                Ship.Shield = Math.Max(0.0, Ship.Shield - 0.05);
+                var newShield = Ship.Shield - 0.08;
+                if (newShield < 0.0)
+                {
+                    // Ship is dead - Reset asteroids and bullets.
+                    m_lives--;
+                    Asteroids.Clear();
+                    Bullets.Clear();
+                    Ship.Reset();
+                    return;
+                }
+                
+                Ship.Shield = newShield;
                 break;
             }
         }

G33kShell.Desktop/Console/Screensavers/Asteroids/Ship.cs

@@ -19,11 +19,12 @@ public class Ship
     private readonly int m_arenaWidth;
     private readonly int m_arenaHeight;
     private const float MaxSpeed = 0.2f;
+    private const double MaxShield = 1.0;
 
     private Vector2 m_acceleration = Vector2.Zero;
 
     public enum Turn { None, Left, Right }
-    public double Shield { get; set; } = 1.0;
+    public double Shield { get; set; }
     public float Theta { get; private set; }
     public static int MaxBullets => 8;
 
@@ -44,7 +45,8 @@ public Ship(int arenaWidth, int arenaHeight)
     {
         m_arenaWidth = arenaWidth;
         m_arenaHeight = arenaHeight;
-        Position = new Vector2(arenaWidth / 2.0f, arenaHeight / 2.0f);
+        
+        Reset();
     }
 
     public void Move()
@@ -74,4 +76,17 @@ public void Move()
         var newY = (Position.Y + m_arenaHeight) % m_arenaHeight;
         Position = new Vector2(newX, newY);
     }
+
+    /// <summary>
+    /// Called when the ship is destroyed. Reset to the center of the arena.
+    /// </summary>
+    public void Reset()
+    {
+        Position = new Vector2(m_arenaWidth / 2.0f, m_arenaHeight / 2.0f);
+        Shield = MaxShield;
+        IsShooting = false;
+        Turning = Turn.None;
+        IsThrusting = false;
+        Velocity = Vector2.Zero;
+    }
 }

G33kShell.Desktop/Console/Screensavers/Pong/PongCanvas.cs

@@ -62,7 +62,7 @@ private void PlayGame(ScreenData screen)
             m_games[0].ResetGame();
     }
 
-    protected override void DrawGame(ScreenData screen, AiGameBase aiGame)
+    private void DrawGame(ScreenData screen, AiGameBase aiGame)
     {
         var game = (Game)aiGame;
         var dimRgb = 0.2.Lerp(Background, Foreground);

G33kShell.Desktop/Console/Screensavers/Snake/SnakeCanvas.cs

@@ -51,7 +51,7 @@ private void PlayGame(ScreenData screen)
         m_games[0].Tick();
     }
 
-    protected override void DrawGame(ScreenData screen, AiGameBase aiGame)
+    private static void DrawGame(ScreenData screen, AiGameBase aiGame)
     {
         var game = (Game)aiGame;