Voile/Source/SceneGraph/EntityLayer.cs

using DaggerFramework.Rendering;

namespace DaggerFramework.SceneGraph
{
    public class EntityLayer : Layer
    {
        public List<Entity> Entities { get => _entities; }
        public EntityLayer(List<Entity> entities)
        {
            _entities = entities;
        }

        public EntityLayer()
        {
            _entities = new List<Entity>();
        }

        public bool AddEntity(Entity entity)
        {
            entity.Id = Entities.Count;
            entity.Layer = this;
            Entities.Add(entity);
            return true;
        }

        public void DestroyEntity(int at)
        {
            _entities.RemoveAt(at);
        }

        protected override void OnStart()
        {
            foreach (var entity in _entities)
            {
                entity.Layer = this;
                entity.Start();
            }
        }

        protected override void OnUpdate(double dt)
        {
            foreach (var entity in _entities)
            {
                entity.Update(dt);
            }
        }

        protected override void OnDraw(Renderer renderer)
        {
            foreach (IDrawable drawable in _entities)
            {
                drawable.Draw(renderer);
            }
        }

        private List<Entity> _entities;
    }
}