refactor: reorganize project structure and move examples

- Move examples (Blackjack, TicTacToe) to the root directory - Convert example projects from Console applications to Libraries - Add Directory.Build.props for shared build settings - Update solution file and project references to reflect new paths
2026-07-20 16:30:02 +08:00
parent 5594515a53
commit 7946f4bafd
80 changed files with 61 additions and 549 deletions
@@ -0,0 +1,85 @@
+using OECS;
+
+namespace TicTacToe;
+
+/// <summary>
+/// After each move, checks whether the game has been won or drawn.
+/// Updates the GameState singleton accordingly.
+/// </summary>
+public class WinCheckSystem : ISystem
+{
+    public void Run(World world)
+    {
+        // Check game status before doing any work. Use ReadSingleton
+        // to avoid auto-marking GameState as modified when we bail early.
+        if (world.ReadSingleton<GameState>().Status != GameStatus.Playing)
+            return;
+
+        ref var state = ref world.GetSingleton<GameState>();
+
+        // Build a 3×3 grid of marks using the iterator API.
+        var grid = new Player[3, 3];
+
+        using var iter = world.Select<Cell, Mark>();
+        while (iter.MoveNext())
+        {
+            grid[iter.Current1.Row, iter.Current1.Col] = iter.Current2.Player;
+        }
+
+        // Check rows.
+        for (int r = 0; r < 3; r++)
+        {
+            if (TryGetWinner(grid[r, 0], grid[r, 1], grid[r, 2], out var winner))
+            {
+                SetWinner(world, ref state, winner);
+                return;
+            }
+        }
+
+        // Check columns.
+        for (int c = 0; c < 3; c++)
+        {
+            if (TryGetWinner(grid[0, c], grid[1, c], grid[2, c], out var winner))
+            {
+                SetWinner(world, ref state, winner);
+                return;
+            }
+        }
+
+        // Check diagonals.
+        if (TryGetWinner(grid[0, 0], grid[1, 1], grid[2, 2], out var diag1))
+        {
+            SetWinner(world, ref state, diag1);
+            return;
+        }
+        if (TryGetWinner(grid[0, 2], grid[1, 1], grid[2, 0], out var diag2))
+        {
+            SetWinner(world, ref state, diag2);
+            return;
+        }
+
+        // Check draw.
+        if (state.MoveCount >= 9)
+        {
+            state.Status = GameStatus.Draw;
+            world.MarkModified<GameState>(World.SingletonEntity);
+        }
+    }
+
+    private static bool TryGetWinner(Player a, Player b, Player c, out Player winner)
+    {
+        if (a != Player.None && a == b && b == c)
+        {
+            winner = a;
+            return true;
+        }
+        winner = Player.None;
+        return false;
+    }
+
+    private static void SetWinner(World world, ref GameState state, Player winner)
+    {
+        state.Status = winner == Player.X ? GameStatus.XWon : GameStatus.OWon;
+        world.MarkModified<GameState>(World.SingletonEntity);
+    }
+}