3-14 Player Death Animation

製作好玩家死亡時播放的音效後，接著要來製作玩家死亡後要播放特定的動畫。首先，在Player的Animator中新增State。

將State取名為Death，Motion選擇Armed-Death1。如不知道這個Motion是去哪邊下載的，請大家先從以下文章連結進行下載：

2-27 Import Mechanim Animation Pack

https://rpgcorecombat.blogspot.tw/2017/12/2-27-import-mechanim-animation-pack.html

接著在Grounded中按右鍵，選擇Make Transition，將其連結到Death。

然後在Attack中也建立連結，連到Death。

新增一個名為Death的Trigger。

然後點擊Grounded到Death之間的連結線，從Inspector視窗中增加Conditions，選擇Death。

同理在Attack到Death的連結中，Conditions也選擇Death。

另外，我將Has Exit Time關掉，不然玩家死掉之後還要等快1秒的時間，人物才會倒下去。大家可以自由調整Exit Time，我喜歡讓玩家直接死掉，所以就關掉了。

底下提供Player.cs的程式碼：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Assertions;
using UnityEngine.SceneManagement;
using RPG.CameraUI; // TODO consider re-wiring
using RPG.Core;
using RPG.Weapons;

namespace RPG.Character{
 public class Player : MonoBehaviour, IDamageable {

  [SerializeField] float maxHealthPoints = 100f;
  [SerializeField] float baseDamage = 50f;
  [SerializeField] AnimatorOverrideController animatorOverrideController;
  [SerializeField] Weapon weaponInUse;
  [SerializeField] SpecialAbilityConfig[] abilities;
  [SerializeField] AudioClip[] damageSounds;
  [SerializeField] AudioClip[] deathSounds;

  // 定義Trigger的字串常數
  const string DEATH_TRIGGER = "Death";
  const string ATTACK_TRIGGER = "Attack";

  float lastHitTime;
  float currentHealthPoint;
  CameraRaycaster cameraRaycaster;
  ISpecialAbility[] specialAbility;
  AudioSource audioSource;
  Animator animator;


  public float healthAsPercentage{
   get{ return currentHealthPoint / maxHealthPoints; }
  }

  void Start(){
   // 初始化血量
   currentHealthPoint = maxHealthPoints;
   cameraRaycaster = FindObjectOfType ();
   // 註冊滑鼠碰到敵人的事件
   cameraRaycaster.onMouseOverEnemy += OnMouseOverEnemy;
   // 初始化武器，放置到手中
   PutWeaponInHand ();
   // 覆寫人物角色中的Animation
   OverrideAnimatorController ();
   // 替Player增加技能的Behaviour，並回傳ISpecialAbility物件
   AttachSpecialAbility();
   audioSource = GetComponent ();
  }

  private void AttachSpecialAbility(){
   specialAbility = new ISpecialAbility[abilities.Length];
   for (int i = 0; i < abilities.Length; i++) {
    // 儲存ISpecialAbility物件
    specialAbility[i] = abilities [i].AddComponent (gameObject);
   }
  }

  private void OverrideAnimatorController(){
   // 取得Animator物件
   animator = GetComponent ();
   // 將人物的Animator取代為我們剛剛新增的Player Animator Override
   animator.runtimeAnimatorController = animatorOverrideController;
   // Player Animator Override中有一預設的DEFAULT ATTACK，將其取代成Weapon物件中的Animation
   // 亦即人物的Animation將會依據不同的Weapon物件，而使用有不同的動畫
   animatorOverrideController ["DEFAULT ATTACK"] = weaponInUse.GetAnimClip ();
  }

  private void PutWeaponInHand(){
   GameObject weaponPrefab = weaponInUse.GetWeaponPrefab ();
   // 生成武器時，將會放置到指定的GameObject之下，此處為WeaponSocket之下
   // 故可將WeaponSocket設置成玩家的右手或左手
   GameObject weaponSocket = RequestDominantHand();
   GameObject weapon = Instantiate (weaponPrefab, weaponSocket.transform);
   // 將武器放置到正確的位置，並有正確的方向
   weapon.transform.localPosition = weaponInUse.gripTransform.localPosition;
   weapon.transform.localRotation = weaponInUse.gripTransform.localRotation;
  }

  private GameObject RequestDominantHand(){
   // 從Children中尋找包含DominantHand的物件
   DominantHand[] dominantHand = GetComponentsInChildren ();
   // 計算取得有DominantHand的物件的數量
   int numberOfDominantHands = dominantHand.Length;
   // 確保該數量不為0
   Assert.AreNotEqual (numberOfDominantHands, 0, "No DominantHand found on player, please add one");
   // 確保該數量不要大於1
   Assert.IsFalse (numberOfDominantHands > 1, "Multiple Dominant script on Player, please remove one");
   // 傳回屬於該DominantHand的GameObject
   return dominantHand [0].gameObject;
  }

  void OnMouseOverEnemy(Enemy enemy){
   if (Input.GetMouseButtonDown (0) && IsTargetInRange (enemy)) {
    AttackTarget (enemy);
   }else if (Input.GetMouseButtonDown (1)) {
    // 0為使用第一個技能 
    AttemptSpecialAbility(0, enemy);
   }
  }

  private void AttemptSpecialAbility(int abilityIndex, Enemy enemy){
   Energy energyComponent = GetComponent ();
   // 取得技能需要的能量消耗量
   float energyCost = abilities [abilityIndex].GetEnergyCost ();

   if (energyComponent.IsEnergyAvailable (energyCost)) {
    energyComponent.ConsumeEnergy (energyCost);
    // 發動技能，並傳入Player的baseDamage
    AbilityParams abilityParams = new AbilityParams (enemy, baseDamage);
    specialAbility [abilityIndex].Use(abilityParams);
   }

  }

  private void AttackTarget(Enemy enemy){
   // 確認本次攻擊時間離上一次攻擊時間須大於minTimeBetweenHits，相當於技能冷卻時間
   if ( (Time.time - lastHitTime > weaponInUse.GetMinTimeBetweenHits())) {
    // 呼叫Trigger啟動攻擊動畫
    animator.SetTrigger(ATTACK_TRIGGER);
    // 呼叫攻擊Target的方法
    enemy.TakeDamage(baseDamage);
    // 紀錄目前攻擊的時間
    lastHitTime = Time.time;
   }
  }

  // 確認敵人是否在範圍技的攻擊範圍內
  private bool IsTargetInRange(Enemy enemy){
   float distanceToTarget = (enemy.transform.position - transform.position).magnitude;
   return distanceToTarget <= weaponInUse.GetMaxAttackRange();
  }

  public void TakeDamage(float damage){
   // Math.Clamp可以確保數值運算後不會低於最小值或者高於最大值
   currentHealthPoint = Mathf.Clamp (currentHealthPoint - damage, 0f, maxHealthPoints);
   // 隨機播放受傷的音效
   audioSource.clip = damageSounds [Random.Range (0, damageSounds.Length)];
   audioSource.Play ();
   bool playerDies = currentHealthPoint <= 0;
   if (playerDies) {
    StartCoroutine (KillPlayer ());
   }
  }

  IEnumerator KillPlayer(){
   // 播放死亡音效
   audioSource.clip = deathSounds [Random.Range (0, deathSounds.Length)];
   audioSource.Play ();
   // 播放死亡動畫
   animator.SetTrigger(DEATH_TRIGGER);
   // 等待一段時間（依音效長度而定）
   yield return new WaitForSecondsRealtime(audioSource.clip.length);
   // 重載關卡
   SceneManager.LoadScene(0);
  }
 }
}

最後，執行遊戲看看，發現血量沒有了以後，角色就倒下啦！