GridRenderSystem.cs

using Leopotam.EcsLite;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using RTS;

public class GridRenderSystem : IEcsRunSystem
{
    private readonly SpriteBatch _spriteBatch;
    private readonly Texture2D _pixelTexture;  // Автоматически генерируемая белая текстура 1x1
    private readonly Camera _camera;

    public GridRenderSystem(SpriteBatch spriteBatch, GraphicsDevice graphicsDevice, Camera camera)
    {
        _spriteBatch = spriteBatch;
        _camera = camera;
        
        // Автоматическая генерация _pixelTexture
        _pixelTexture = new Texture2D(graphicsDevice, 1, 1);
        _pixelTexture.SetData(new Color[] { Color.White });
    }

    public void Run(IEcsSystems systems)
    {
        DrawGrid();
    }

    private void DrawGrid()
    {
        if (Game1.WorldGrid == null) return;

        Color gridColor = Color.Gray * 0.5f;
        int lineThickness = MathHelper.Max(1, (int)(1 / _camera.Zoom+1));

        Rectangle visibleArea = GetVisibleWorldBounds();

        // Вертикальные линии сетки
        for (int x = 0; x <= Game1.WorldGrid.Width; x++)
        {
            float worldX = Game1.XLLimit + x * Game1.WorldGrid.CellSize;
            if (worldX < visibleArea.Left - lineThickness || worldX > visibleArea.Right + lineThickness) continue;

            Vector2 start = new Vector2(worldX, MathHelper.Max(Game1.YLLimit, visibleArea.Top));
            Vector2 end = new Vector2(worldX, MathHelper.Min(Game1.YRLimit, visibleArea.Bottom));
            float length = end.Y - start.Y;

            _spriteBatch.Draw(_pixelTexture, new Rectangle((int)worldX, (int)start.Y, lineThickness, (int)length), gridColor);
        }

        // Горизонтальные линии сетки
        for (int y = 0; y <= Game1.WorldGrid.Height; y++)
        {
            float worldY = Game1.YLLimit + y * Game1.WorldGrid.CellSize;
            if (worldY < visibleArea.Top - lineThickness || worldY > visibleArea.Bottom + lineThickness) continue;

            Vector2 start = new Vector2(MathHelper.Max(Game1.XLLimit, visibleArea.Left), worldY);
            Vector2 end = new Vector2(MathHelper.Min(Game1.XRLimit, visibleArea.Right), worldY);
            float length = end.X - start.X;

            _spriteBatch.Draw(_pixelTexture, new Rectangle((int)start.X, (int)worldY, (int)length, lineThickness), gridColor);
        }
    }

    private Rectangle GetVisibleWorldBounds()
    {
        Vector2 topLeft = _camera.ScreenToWorld(new Vector2(0, 0));
        Vector2 bottomRight = _camera.ScreenToWorld(new Vector2(Game1.Xmap, Game1.Ymap));
        return new Rectangle((int)topLeft.X, (int)topLeft.Y, (int)(bottomRight.X - topLeft.X), (int)(bottomRight.Y - topLeft.Y));
    }
}