TestObjectRenderSystem.cs

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

public class TestObjectRenderSystem : IEcsRunSystem
{
    private EcsWorld _world;
    private EcsFilter _objectFilter;
    private EcsPool<GameObject> _gameObjectPool;
    private EcsPool<Bounds> _boundsPool;
    private EcsPool<ColorComponent> _colorPool;
    private EcsPool<Selected> _selectedPool;
    private SpriteBatch _spriteBatch;

    public TestObjectRenderSystem(EcsWorld world, GraphicsDevice graphicsDevice, SpriteBatch spriteBatch)
    {
        _world = world;
        _objectFilter = _world.Filter<GameObject>().Inc<Bounds>().Inc<ColorComponent>().End();
        _gameObjectPool = _world.GetPool<GameObject>();
        _boundsPool = _world.GetPool<Bounds>();
        _colorPool = _world.GetPool<ColorComponent>();
        _selectedPool = _world.GetPool<Selected>();
        _spriteBatch = spriteBatch;
    }

    public void Run(IEcsSystems systems)
    {
        foreach (int entity in _objectFilter)
        {
            ref GameObject gameObject = ref _gameObjectPool.Get(entity);
            ref Bounds bounds = ref _boundsPool.Get(entity);
            ref ColorComponent color = ref _colorPool.Get(entity);

            // Меняем цвет, если объект выделен
            // color.Value = _selectedPool.Has(entity) ? Color.Red : Color.White;
            
            // Рисуем прямоугольник (квадрат) с помощью pixel texture
            //_spriteBatch.Draw(_pixelTexture, bounds.Rectangle, drawColor);
        }
    }
}