3D游戏——巡逻兵

工厂模式

工厂模式(Factory Design Pattern)也是游戏开发中比较常用的创建型模式，一般情况下，工厂模式分为三种更加细分的类型：简单工厂、工厂方法和抽象工厂。

工厂模式的意义:

将实例化对象的代码提取出来，放到一个类中统一管理和维护，达到和主项目的依赖关系的解耦。从而提高项目的扩展和维护性。

设计模式的依赖抽象原则

• 创建对象实例时，不要直接new类，而是把这个new类的动作放在一个工厂的方法中，并返回。(变量不要直接持有具体类的引用)
• 不要让类继承具体类，而是继承抽象类或者实现interface(接口)
• 不要覆盖基类中已经实现的方法

（学习了大佬的讲解：工厂模式）

游戏规则

使用WSAD或方向键上下左右移动player，进入巡逻兵的追捕后逃脱可积累一分，若与巡逻兵碰撞则游戏结束，收集完地图上的所有水晶即可获胜。

游戏设计

• 创建一个地图和若干巡逻兵(使用动画)；
• 每个巡逻兵走一个3~5个边的凸多边型，位置数据是相对地址。即每次确定下一个目标位置，用自己当前位置为原点计算；
• 巡逻兵碰撞到障碍物，则会自动选下一个点为目标；
• 巡逻兵在设定范围内感知到玩家，会自动追击玩家；
• 失去玩家目标后，继续巡逻；
• 计分：玩家每次甩掉一个巡逻兵计一分，与巡逻兵碰撞游戏结束；

程序设计

使用订阅与发布模式传消息
工厂模式生产巡逻兵

游戏UML图

实现部分

项目模型

在网站Unity3D_模型_资源_商店(unity asset store)_免费下载 - 爱给网 (aigei.com)下载

 AnimatorController

 实现代码

工厂模式：PatrolFactory.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class PatorlFactory : MonoBehaviour {
 
    //工厂模式就负责生产，其他的不负责，所以可以看到这个类只和角色有关系和其他所有代码都没有关系
    private GameObject player = null;                                      //玩家
    private GameObject patrol = null;                                     //巡逻兵
    private List<GameObject> patrolList = new List<GameObject>();        //正在被使用的巡逻兵
    private Vector3[] vec = new Vector3[9];                             //保存每个巡逻兵的初始位置
 
    public GameObject LoadPlayer()
    {
        player = Instantiate(Resources.Load("Prefabs/Player"), new Vector3(0, 9, 0), Quaternion.identity) as GameObject;
        return player;
    }
 
    public List<GameObject> LoadPatrol()
    {
        int[] pos_x = { -6, 4, 13 };
        int[] pos_z = { -4, 6, -13 };
        int index = 0;
 
        for(int i=0;i < 3;i++)
        {
            for(int j=0;j < 3;j++)
            {
                vec[index] = new Vector3(pos_x[i], 0, pos_z[j]);
                index++;
            }
        }
        for(int i=0; i < 9; i++)
        {
            patrol = Instantiate(Resources.Load<GameObject>("Prefabs/Patrol1"));
            patrol.transform.position = vec[i];
            patrol.GetComponent<PatrolData>().sign = i + 1;
            patrol.GetComponent<PatrolData>().start_position = vec[i];
            patrolList.Add(patrol);
        }   
        return patrolList;
    }
 
    //游戏结束时，暂停所有动作
    public void StopPatrol()
    {
        for (int i = 0; i < patrolList.Count; i++)
        {
            patrolList[i].gameObject.GetComponent<Animator>().SetBool("run", false);
        }
    }
}

 巡逻动作：PatrolAction.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class GoPatrolAction : SSAction
{
	private enum Dirction { E, N, W, S };
	private float pos_x, pos_z; 
	private float move_length; 
	private float move_speed = 1.2f; 
	private bool move_sign = true;
	private Dirction dirction = Dirction.E; 
	private PatrolData data;
 
	private GoPatrolAction() { }
	public static GoPatrolAction GetSSAction(Vector3 location)
	{
		GoPatrolAction action = CreateInstance<GoPatrolAction>();
		action.pos_x = location.x;
		action.pos_z = location.z;
		action.move_length = Random.Range(5, 8);
		return action;
	}
	public override void Update()
	{
		if (transform.localEulerAngles.x != 0 || transform.localEulerAngles.z != 0)transform.localEulerAngles = new Vector3(0, transform.localEulerAngles.y, 0);          
		if (transform.position.y != 0)transform.position = new Vector3(transform.position.x, 0, transform.position.z);
		Gopatrol();
		if (data.follow_player && data.wall_sign == data.sign)
		{
			this.destroy = true;
			this.callback.SSActionEvent(this,0,this.gameobject);
		}
	}
	public override void Start(){data  = this.gameobject.GetComponent<PatrolData>();}
	void Gopatrol()
	{
		if (move_sign)
		{
			switch (dirction)
			{
			case Dirction.E:
				pos_x -= move_length;
 
				break;
			case Dirction.N:
				pos_z += move_length;
 
				break;
			case Dirction.W:
				pos_x += move_length;
 
				break;
			case Dirction.S:
				pos_z -= move_length;
 
				break;
			}
			move_sign = false;
		}
		this.transform.LookAt(new Vector3(pos_x, 0, pos_z));
		float distance = Vector3.Distance(transform.position, new Vector3(pos_x, 0, pos_z));
		if (distance > 0.9){transform.position = Vector3.MoveTowards(this.transform.position, new Vector3(pos_x, 0, pos_z), move_speed * Time.deltaTime);
		}else
		{
			dirction = dirction + 1;
			if(dirction > Dirction.S)dirction = Dirction.E;
			move_sign = true;
		}
	}
}

追踪动作:PatrolFollowAction.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class PatrolFollowAction : SSAction
{
	private float speed = 2f;
	private GameObject player;
	private PatrolData data;
	private PatrolFollowAction() { }
	public static PatrolFollowAction GetSSAction(GameObject player)
	{
		PatrolFollowAction action = CreateInstance<PatrolFollowAction>();
		action.player = player;
		return action;
	}
	public override void Update()
	{
		if (transform.localEulerAngles.x != 0 || transform.localEulerAngles.z != 0)transform.localEulerAngles = new Vector3(0, transform.localEulerAngles.y, 0);          
		if (transform.position.y != 0)transform.position = new Vector3(transform.position.x, 0, transform.position.z);
		Follow();
		if (!data.follow_player || data.wall_sign != data.sign)
		{
			this.destroy = true;
			this.callback.SSActionEvent(this,1,this.gameobject);
		}
	}
	public override void Start(){data = this.gameobject.GetComponent<PatrolData>();}
	void Follow()
	{
		transform.position = Vector3.MoveTowards(this.transform.position, player.transform.position, speed * Time.deltaTime);
		this.transform.LookAt(player.transform.position);
	}
}

动作管理:PatrolActionManager.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class PatrolActionManager : SSActionManager, ISSActionCallback
{
	private GoPatrolAction go_patrol;  
	public void GoPatrol(GameObject patrol)
	{
		go_patrol = GoPatrolAction.GetSSAction(patrol.transform.position);
		this.RunAction(patrol, go_patrol, this);
	}
	public void DestroyAllAction(){DestroyAll();}
    public void SSActionEvent(SSAction source, int intParam = 0, GameObject objectParam = null)
    {
        if (intParam == 0)
        {
            PatrolFollowAction follow = PatrolFollowAction.GetSSAction(objectParam.gameObject.GetComponent<PatrolData>().player);
            this.RunAction(objectParam, follow, this);
        }
        else
        {
            GoPatrolAction move = GoPatrolAction.GetSSAction(objectParam.gameObject.GetComponent<PatrolData>().start_position);
            this.RunAction(objectParam, move, this);
            Singleton<GameEventManager>.Instance.PlayerEscape();
        }
    }
}