[Unity2D入门教程]简单制作仿植物大战僵尸游戏之⑤制作更多的敌人Attacker以及防御者Defender

制作更多的Defender：

之前我们创建了一个向日葵和一个仙人掌，今天我们多创建两个

首先是一个老头Gnome，我们让它的功能和仙人掌一样，所以我会尽量快点讲完，

需要给它三个脚本Defender，Shooter，Health

using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class Defender : MonoBehaviour
{[SerializeField] int starCost = 100;public int GetStarCost(){return starCost;}public void AddStars(int amount){FindObjectOfType<StarsDisplay>().AddStars(amount);}
}

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class Shooter : MonoBehaviour
{[SerializeField] GameObject projectTile;[SerializeField] GameObject gun;AttackSpawner myLaneSpawner;Animator animator;private void Start(){animator = GetComponent<Animator>();SetLaneSpawner();}private void Update(){if(IsAttackerInLand()){animator.SetBool("isAttacking", true);}else{animator.SetBool("isAttacking", false);}}private void SetLaneSpawner(){AttackSpawner[] spawners = FindObjectsOfType<AttackSpawner>();//找到这行路的所有敌人foreach(var spawner in spawners){//判断是不是在我们这一行bool IsCloseEnough = (Mathf.Abs( spawner.transform.position.y - transform.position.y ) <= Mathf.Epsilon);if (IsCloseEnough){myLaneSpawner = spawner; //找到我这条路的生成敌人}}}private bool IsAttackerInLand(){//如果我这条路上的敌人数量小于等于0return falseif(myLaneSpawner.transform.childCount <= 0){return false;}else{return true;}}public void Fire(){Instantiate(projectTile, gun.transform.position, transform.rotation); //生成子弹}
}

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class Health : MonoBehaviour
{[SerializeField] float health = 100f;[SerializeField] GameObject deathVFX;public void DealDamage(float damage){health -= damage;if(health <= 0){TriggerDeathVFX();Destroy(gameObject);}}//生成爆炸特效private void TriggerDeathVFX(){if (!deathVFX) return;GameObject deathVFXObject = Instantiate(deathVFX, transform.position, transform.rotation);Destroy(deathVFXObject, 1f); //1秒后销毁生成的爆炸特效}
}

然后给它碰撞框和动画并把参数都填上去后我们给它一个空对象Body创建组件Sprite Renderer。通过改变它的Sprite来制造动画。

斧头的Prefab如下

动画就让他旋转365°

using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class Projectile : MonoBehaviour
{[SerializeField] float speed = 1f;[SerializeField] float damage = 50f;void Update(){transform.Translate(Vector2.right * speed * Time.deltaTime);}private void OnTriggerEnter2D(Collider2D other){var health = other.GetComponent<Health>();var attacker = other.GetComponent<Attacker>();if(attacker && health){health.DealDamage(damage);Destroy(gameObject);}}
}

然后我们来创建一个墓碑GraveStone，相当于高坚果，它的血量非常厚可以挡住很久

除了前面的脚本还要给他一个独特的脚本，但只是给之后我们创建的敌人识别的

using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class GraveStone : MonoBehaviour
{private void OnTriggerStay2D(Collider2D other){Attacker attacker = other.GetComponent<Attacker>();if (attacker){}}
}

给它做个动画就稍微改变一下它的Scale值

最后，别忘了把他们放到我们之前创建的Quad中

创建敌人：

在创建新的敌人之前，我们需要让敌人都实现能吃植物的动画，因此我们创建一个鳄鱼的吃植物动画Lizard Attack把对应的素材拖进ANimation

我们选择添加动画事件，当执行那一帧的时候植物掉血。

吃植物时候速度为0

这个是一口多少血

创建一个Lizard给它

using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class Lizard : MonoBehaviour
{private void OnTriggerEnter2D(Collider2D other){GameObject otherGameObject = other.gameObject;if (otherGameObject.GetComponent<Defender>()){GetComponent<Attacker>().Attack(otherGameObject);}}
}

Attacker脚本更新后如下：

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class Attacker : MonoBehaviour
{GameObject currentTarget;[Range(0, 5)]float currentSpeed = 1f;private void Awake(){FindObjectOfType<LevelController>().AttackerSpawn();}private void OnDestroy(){LevelController level = FindObjectOfType<LevelController>();if (level != null){level.AttackerKilled();}}void Update(){transform.Translate(Vector2.left * currentSpeed * Time.deltaTime);UpdateAnimationState();}private void UpdateAnimationState(){if (!currentTarget){GetComponent<Animator>().SetBool("isAttacking", false); }}public void SetMovementSpeed(float speed){currentSpeed = speed;}public void Attack(GameObject target){GetComponent<Animator>().SetBool("isAttacking", true); //播放吃植物动画currentTarget = target;//锁定植物}public void StrikeCurrentTarget(float damage){if (!currentTarget) return;Health health = currentTarget.GetComponent<Health>();if (health){health.DealDamage(damage);//扣植物的血}}}

在完成了鳄鱼后，我们要创建一个特别的狐狸敌人：

同样先给他设置好动画

给它添加好脚本后添加参数再创建一个名字叫fox的脚本

using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class Fox : MonoBehaviour
{private void OnTriggerEnter2D(Collider2D other){GameObject otherGameObject = other.gameObject;if (otherGameObject.GetComponent<GraveStone>()) //当遇到gravestone时他会跳过去{GetComponent<Animator>().SetTrigger("JumpTrigger");}else if (otherGameObject.GetComponent<Defender>()) //而其它的他会吃掉{GetComponent<Attacker>().Attack(otherGameObject);}}
}

同样我们也要为他创建动画事件

游戏效果：

可见跑的跑跳的跳，鳄鱼直接开吃，最下排的生成敌人给老头两斧头扔死了