using ActionGameFramework.Projectiles;
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using Core.Utilities;
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using TowerDefense.Towers;
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using UnityEngine;
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namespace TowerDefense.Effects
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{
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/// <summary>
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/// Class for spawning and managing effects on this projectile. Used for effects that should persist
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/// a little longer after a projectile is destroyed/repooled. Creates the effect on enable, moves it to
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/// follow us every frame while we're active.
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///
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/// On disable, it'll try and find a SelfDestroyTimer on the effect to trigger its destruction, otherwise
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/// repools it immediately.
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/// </summary>
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[RequireComponent(typeof(IProjectile))]
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public class ProjectileEffect : MonoBehaviour
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{
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/// <summary>
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/// Preafb that gets spawned when this projectile fires
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/// </summary>
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public GameObject effectPrefab;
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/// <summary>
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/// Transform the effect follows
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/// </summary>
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public Transform followTransform;
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/// <summary>
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/// Cached spawned effect
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/// </summary>
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GameObject m_SpawnedEffect;
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/// <summary>
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/// Cached destruction timer on the spawned object
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/// </summary>
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SelfDestroyTimer m_DestroyTimer;
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/// <summary>
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/// Cached poolable effect on the spawned object
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/// </summary>
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PoolableEffect m_Resetter;
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/// <summary>
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/// Cached projectile
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/// </summary>
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IProjectile m_Projectile;
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/// <summary>
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/// Register projectile fire events
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/// </summary>
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protected virtual void Awake()
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{
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m_Projectile = GetComponent<IProjectile>();
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m_Projectile.fired += OnFired;
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if (followTransform != null)
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{
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followTransform = transform;
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}
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}
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/// <summary>
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/// Unregister delegates
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/// </summary>
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protected virtual void OnDestroy()
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{
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m_Projectile.fired -= OnFired;
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}
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/// <summary>
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/// Spawn our effect
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/// </summary>
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protected virtual void OnFired()
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{
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if (effectPrefab != null)
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{
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m_SpawnedEffect = Poolable.TryGetPoolable(effectPrefab);
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m_SpawnedEffect.transform.parent = null;
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m_SpawnedEffect.transform.position = followTransform.position;
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m_SpawnedEffect.transform.rotation = followTransform.rotation;
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// Make sure to disable timer if it's on initially, so it doesn't destroy this object
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m_DestroyTimer = m_SpawnedEffect.GetComponent<SelfDestroyTimer>();
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if (m_DestroyTimer != null)
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{
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m_DestroyTimer.enabled = false;
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}
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m_Resetter = m_SpawnedEffect.GetComponent<PoolableEffect>();
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if (m_Resetter != null)
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{
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m_Resetter.TurnOnAllSystems();
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}
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}
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}
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/// <summary>
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/// Make effect follow us
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/// </summary>
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protected virtual void Update()
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{
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// Make the effect follow our position.
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// We don't reparent it because it should not be disabled when we are
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if (m_SpawnedEffect != null)
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{
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m_SpawnedEffect.transform.position = followTransform.position;
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}
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}
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/// <summary>
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/// Destroy and start destruction of effect
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/// </summary>
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protected virtual void OnDisable()
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{
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if (m_SpawnedEffect == null)
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{
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return;
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}
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// Initiate destruction timer
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if (m_DestroyTimer != null)
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{
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m_DestroyTimer.enabled = true;
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if (m_Resetter != null)
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{
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m_Resetter.StopAll();
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}
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}
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else
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{
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// Repool immediately
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Poolable.TryPool(m_SpawnedEffect);
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}
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m_SpawnedEffect = null;
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m_DestroyTimer = null;
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}
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}
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}
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