move backend to subfolder

tanks-backend/TanksServer/Graphics/GamePixelGrid.cs

@@ -0,0 +1,48 @@
+using System.Collections;
+using System.Diagnostics;
+
+namespace TanksServer.Graphics;
+
+internal sealed class GamePixelGrid : IEnumerable<GamePixel>
+{
+    public int Width { get; }
+    public int Height { get; }
+
+    private readonly GamePixel[,] _pixels;
+
+    public GamePixelGrid(int width, int height)
+    {
+        Width = width;
+        Height = height;
+
+        _pixels = new GamePixel[width, height];
+        for (var y = 0; y < height; y++)
+        for (var x = 0; x < width; x++)
+            this[x, y] = new GamePixel();
+    }
+
+    public GamePixel this[int x, int y]
+    {
+        get
+        {
+            Debug.Assert(y * Width + x < _pixels.Length);
+            return _pixels[x, y];
+        }
+        set => _pixels[x, y] = value;
+    }
+
+    public void Clear()
+    {
+        foreach (var pixel in _pixels)
+            pixel.Clear();
+    }
+
+    IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+
+    public IEnumerator<GamePixel> GetEnumerator()
+    {
+        for (var y = 0; y < Height; y++)
+        for (var x = 0; x < Width; x++)
+            yield return this[x, y];
+    }
+}