2-17 Player Melee Damage

今天要來製作玩家的範圍技！哈哈，不過還沒有動畫特效啦，先把程式碼的部分實作好。首先請大家下載課程提供的武器：

https://drive.google.com/open?id=1IQ0ZSC3Vb81azDetujhYL6czBMZD9R56

自己匯入。

匯入之後放在場景中。

然後請將武器物件放到Player中，結構如下圖。Player/Armature/Hips/Spine/Shoulder_R/Upper_Arm_R/Lower_Arm_R/Hand_R底下，簡言之就是右手下面啦。

然後請自己調整武器的位置，就像是握在手上。執行看看吧，開始遊戲後武器就會跟人物的動畫綁在一起。

以下提供程式碼，註解也寫在程式碼中嘍：
Player.cs：

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using System.Collections; using System.Collections.Generic; using UnityEngine;   public class Player : MonoBehaviour, IDamageable {    [SerializeField] float maxHealthPoints = 100f;  [SerializeField] float damagePerHit = 50f;  [SerializeField] float minTimeBetweenHits = 0.5f;  [SerializeField] float maxAttackRange = 5f;    GameObject currentTarget;  float currentHealthPoint;  float lastHitTime;  CameraRaycaster cameraRaycaster;    public float healthAsPercentage{   get{ return currentHealthPoint / maxHealthPoints; }  }    void Start(){   // 初始化血量   currentHealthPoint = maxHealthPoints;     cameraRaycaster = FindObjectOfType<cameraraycaster> ();   cameraRaycaster.notifyMouseClickObservers += OnMouseClick ;  }    void OnMouseClick(RaycastHit raycastHit, int layerHit){   const int enemyLayer = 9;   if (layerHit == enemyLayer) {    GameObject enemy = raycastHit.collider.gameObject;      // 確認敵人是否在範圍技的攻擊範圍內    if ((enemy.transform.position - transform.position).magnitude > maxAttackRange) {     return; // 超過攻擊範圍就跳出    }      // 控制攻擊頻率，若本次攻擊時間離上一次攻擊時間大於minTimeBetweenHits，才允許攻擊    // 相當於範圍技的CD時間，不能一直發動技能！    if (Time.time - lastHitTime > minTimeBetweenHits) {     currentTarget = enemy;     IDamageable enemyDamageable = enemy.GetComponent (typeof(IDamageable)) as IDamageable;     // 讓敵人損血     enemyDamageable.TakeDamage (damagePerHit);     // 紀錄目前攻擊的時間     lastHitTime = Time.time;    }     }  }    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);  } }   </cameraraycaster>

Enemy.cs：

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using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.AI; using UnityStandardAssets.Characters.ThirdPerson;   public class Enemy : MonoBehaviour, IDamageable {    [SerializeField] float maxHealthPoints = 100f;  [SerializeField] float attackRadius = 3.0f;  [SerializeField] float chaseRadius = 10.0f;  [SerializeField] float damagePerShot = 9f;  [SerializeField] float secondsBetweenShots = 0.5f;  [SerializeField] GameObject projectileToUse;  [SerializeField] GameObject projectileSocket;  [SerializeField] Vector3 aimOffset = new Vector3(0, 1f, 0);    bool isAttacking = false;  float currentHealthPoint = 100f;  AICharacterControl aiCharacterControl = null;  GameObject player;  IEnumerator coroutine;    public float healthAsPercentage{   get{ return currentHealthPoint / maxHealthPoints; }  }    void Start(){   aiCharacterControl = GetComponent<aicharactercontrol> ();   player = GameObject.FindGameObjectWithTag ("Player");  }    void Update(){   // 計算Player跟Enemy的距離   float distanceToPlayer = Vector3.Distance (player.transform.position, transform.position);   // 若彼此之間的距離小於attackRadius，就讓Enemy開始攻擊Player   if (distanceToPlayer <= attackRadius && !isAttacking) {    isAttacking = true;    coroutine = SpawnProjectile ();    StartCoroutine (coroutine);   }   if (distanceToPlayer > attackRadius && isAttacking) {    isAttacking = false;    StopCoroutine (coroutine);   }   // 若彼此之間的距離小於chaseRadius，就讓Enemy開始追蹤Player   if (distanceToPlayer <= chaseRadius) {    aiCharacterControl.SetTarget (player.transform);   } else {    aiCharacterControl.SetTarget (transform);   }  }    IEnumerator SpawnProjectile(){   while (true) {    yield return new WaitForSeconds (secondsBetweenShots);      // Instantiate可以生成GameObject，Quaternion.identity為方向不進行任何轉向    GameObject newProjectile = Instantiate(projectileToUse, projectileSocket.transform.position, Quaternion.identity);    // 取得Projectile    Projectile projectileComponent = newProjectile.GetComponent<projectile> ();    // 設定Projectile的攻擊威力    projectileComponent.SetDamage(damagePerShot);    // 計算發射Projectile到Player之間的單位向量    Vector3 unitVectorToPlayer = (player.transform.position + aimOffset - projectileSocket.transform.position).normalized;    float projectileSpeed = projectileComponent.projectileSpeed;    // 將單位向量乘以發射速度，透過velocity將Projectile發射出去吧！    newProjectile.GetComponent<rigidbody> ().velocity = unitVectorToPlayer * projectileSpeed;   }  }    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);   // 敵人血量低於0就會消失   if (currentHealthPoint <= 0) {    Destroy (gameObject);   }  }    void OnDrawGizmos(){   //繪製攻擊範圍   Gizmos.color = new Color(255f, 0f, 0f, 0.5f);   Gizmos.DrawWireSphere (transform.position, attackRadius);     //繪製移動範圍   Gizmos.color = new Color(0f, 0f, 255f, 0.5f);   Gizmos.DrawWireSphere (transform.position, chaseRadius);  } }   </rigidbody></projectile></aicharactercontrol>

開始執行遊戲後，玩家點擊敵人就會走到敵人前面，並且在進入玩家的範圍攻擊內（玩家的紅色框框）才可以讓敵人損血，而且攻擊敵人時有我設定的CD時間0.5秒。

將敵人打死後，敵人就會消失。