separate folders per functionality

TanksServer/Graphics/BulletDrawer.cs

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+using TanksServer.GameLogic;
+using TanksServer.ServicePointDisplay;
+
+namespace TanksServer.Graphics;
+
+internal sealed class BulletDrawer(BulletManager bullets): IDrawStep
+{
+    public void Draw(PixelDisplayBufferView buffer)
+    {
+        foreach (var bullet in bullets.GetAll())
+            buffer.Pixels[bullet.Position.ToPixelPosition().ToPixelIndex()] = true;
+    }
+}

TanksServer/Graphics/DrawStateToFrame.cs

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+using TanksServer.GameLogic;
+using TanksServer.ServicePointDisplay;
+
+namespace TanksServer.Graphics;
+
+internal sealed class DrawStateToFrame(
+    IEnumerable<IDrawStep> drawSteps, LastFinishedFrameProvider lastFrameProvider
+) : ITickStep
+{
+    private readonly List<IDrawStep> _drawSteps = drawSteps.ToList();
+
+    public Task TickAsync()
+    {
+        var buffer = PixelDisplayBufferView.New(0, 0, MapService.TilesPerRow, MapService.PixelsPerColumn);
+        foreach (var step in _drawSteps)
+            step.Draw(buffer);
+        lastFrameProvider.LastFrame = buffer;
+        return Task.CompletedTask;
+    }
+}

TanksServer/Graphics/IDrawStep.cs

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+using TanksServer.ServicePointDisplay;
+
+namespace TanksServer.Graphics;
+
+internal interface IDrawStep
+{
+    void Draw(PixelDisplayBufferView buffer);
+}

TanksServer/Graphics/LastFinishedFrameProvider.cs

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+using TanksServer.ServicePointDisplay;
+
+namespace TanksServer.Graphics;
+
+internal sealed class LastFinishedFrameProvider
+{
+    private PixelDisplayBufferView? _lastFrame;
+    
+    public PixelDisplayBufferView LastFrame
+    {
+        get => _lastFrame ?? throw new InvalidOperationException("first frame not yet drawn");
+        set => _lastFrame = value;
+    }
+}

TanksServer/Graphics/MapDrawer.cs

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+using TanksServer.GameLogic;
+using TanksServer.ServicePointDisplay;
+
+namespace TanksServer.Graphics;
+
+internal sealed class MapDrawer(MapService map) : IDrawStep
+{
+    public void Draw(PixelDisplayBufferView buffer)
+    {
+        for (var tileY = 0; tileY < MapService.TilesPerColumn; tileY++)
+        for (var tileX = 0; tileX < MapService.TilesPerRow; tileX++)
+        {
+            var tile = new TilePosition(tileX, tileY);
+            if (!map.IsCurrentlyWall(tile))
+                continue;
+
+            for (byte pixelInTileY = 0; pixelInTileY < MapService.TileSize; pixelInTileY++)
+            for (byte pixelInTileX = 0; pixelInTileX < MapService.TileSize; pixelInTileX++)
+            {
+                var index = tile.GetPixelRelative(pixelInTileX, pixelInTileY).ToPixelIndex();
+                buffer.Pixels[index] = pixelInTileX % 2 == pixelInTileY % 2;
+            }
+        }
+    }
+}

TanksServer/Graphics/TankDrawer.cs

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+using SixLabors.ImageSharp;
+using SixLabors.ImageSharp.PixelFormats;
+using TanksServer.GameLogic;
+using TanksServer.ServicePointDisplay;
+
+namespace TanksServer.Graphics;
+
+internal sealed class TankDrawer : IDrawStep
+{
+    private readonly TankManager _tanks;
+    private readonly bool[] _tankSprite;
+    private readonly int _tankSpriteWidth;
+
+    public TankDrawer(TankManager tanks)
+    {
+        _tanks = tanks;
+
+        using var tankImage = Image.Load<Rgba32>("assets/tank.png");
+        _tankSprite = new bool[tankImage.Height * tankImage.Width];
+
+        var whitePixel = new Rgba32(byte.MaxValue, byte.MaxValue, byte.MaxValue, byte.MaxValue);
+        var i = 0;
+        for (var y = 0; y < tankImage.Height; y++)
+        for (var x = 0; x < tankImage.Width; x++, i++)
+        {
+            _tankSprite[i] = tankImage[x, y] == whitePixel;
+        }
+
+        _tankSpriteWidth = tankImage.Width;
+    }
+
+    public void Draw(PixelDisplayBufferView buffer)
+    {
+        foreach (var tank in _tanks)
+        {
+            var pos = tank.Position.ToPixelPosition();
+            var rotationVariant = (int)Math.Round(tank.Rotation) % 16;
+            for (var dy = 0; dy < MapService.TileSize; dy++)
+            {
+                var rowStartIndex = (pos.Y + dy) * MapService.PixelsPerRow;
+
+                for (var dx = 0; dx < MapService.TileSize; dx++)
+                {
+                    if (!TankSpriteAt(dx, dy, rotationVariant))
+                        continue;
+
+                    var i = rowStartIndex + pos.X + dx;
+                    buffer.Pixels[i] = true;
+                }
+            }
+        }
+    }
+
+    private bool TankSpriteAt(int dx, int dy, int tankRotation)
+    {
+        var x = tankRotation % 4 * (MapService.TileSize + 1);
+        var y = (int)Math.Floor(tankRotation / 4d) * (MapService.TileSize + 1);
+        var index = (y + dy) * _tankSpriteWidth + x + dx;
+
+        return _tankSprite[index];
+    }
+}