Initial Commit

Assets/Scripts/Systems/Enemy/EnemyDeathSystem.cs

@@ -0,0 +1,82 @@
+using Cinemachine;
+using DefaultNamespace;
+using Events;
+using System;
+using UnityEngine;
+using Zenject;
+using Entity = Unity.Entities.Entity;
+using Hash128 = Unity.Entities.Hash128;
+using Random = UnityEngine.Random;
+
+public class EnemyDeathSystem : InjectableComponentSystem
+{
+	[Serializable]
+	public class Settings
+	{
+		public CinemachineImpulseSource EnemyImpulseSource;
+		public float ImpulseSourceSize;
+		public float ItemDropShootForce;
+	}
+
+	[Inject] private readonly ParticleSystemFactory particleFactory;
+	[Inject] private readonly Settings settings;
+
+	[Inject] private readonly SoundManager soundManager;
+
+	protected override void OnSystemUpdate()
+	{
+		Entities.WithNone<EntityDeathEvent>()
+			.ForEach(
+				(Entity entity, Transform transform, ref Enemy enemy, ref ActorData actor) =>
+				{
+					Vector2 pos = transform.position;
+
+					if (actor.Health <= 0)
+					{
+						if (EntityManager.HasComponent<EnemyPrefabComponent>(entity))
+						{
+							var prefab = EntityManager.GetComponentObject<EnemyPrefabComponent>(entity);
+							settings.EnemyImpulseSource.GenerateImpulseAt(pos, Vector3.one * settings.ImpulseSourceSize);
+							prefab.Prefab.OperationHandle.Convert<EnemyPrefab>().Completed += operation =>
+							{
+								var particles = particleFactory.Create(new Hash128(operation.Result.DeathParticles.AssetGUID));
+								particles.Completed += particleOperation =>
+								{
+									particleOperation.Result.GetComponent<ParticleSystem>().Emit(new ParticleSystem.EmitParams { position = pos }, 1);
+								};
+								foreach (var library in operation.Result.DeathSounds)
+								{
+									soundManager.PlayClip(EntityManager, library, pos);
+								}
+
+								foreach (var drop in operation.Result.Drops)
+								{
+									var r = Random.value;
+									if (r < drop.Chance)
+									{
+										var count = Random.Range(drop.MinCount, drop.MaxCount);
+										if (count > 0)
+										{
+											var e = EntityManager.CreateEntity();
+											EntityManager.AddComponentData(
+												e,
+												new ItemDropEvent
+												{
+													Item = new ItemData(new Hash128(drop.Item.AssetGUID), count),
+													Pos = pos,
+													Velocity = Random.insideUnitCircle * settings.ItemDropShootForce,
+													Inventory = Entity.Null,
+													ToSlot = -1,
+													FromSlot = -1
+												});
+										}
+									}
+								}
+							};
+						}
+
+						PostUpdateCommands.AddComponent(entity, new EntityDeathEvent());
+					}
+				});
+	}
+}