player can shoot bullet (crashes game when leaving map)

TanksServer/DrawSteps/DrawHelpers.cs

@@ -0,0 +1,23 @@
+using System.Diagnostics;
+using TanksServer.Models;
+using TanksServer.Services;
+
+namespace TanksServer.DrawSteps;
+
+internal static class DrawHelpers
+{
+    public static int GetPixelIndex(this PixelPosition position)
+    {
+        return position.Y * MapService.PixelsPerRow + position.X;
+    }
+
+    public static PixelPosition GetPixel(this TilePosition position, byte subX, byte subY)
+    {
+        Debug.Assert(subX < 8);
+        Debug.Assert(subY < 8);
+        return new PixelPosition(
+            X: position.X * MapService.TileSize + subX,
+            Y: position.Y * MapService.TileSize + subY
+        );
+    }
+}