[FreedomAI]第四周——SimpleAI

上周突然发现，对于一些简易的AI，使用FSM+FuSM那一套，明显过于复杂了，对于一个很简单的AI来说，似乎只需要定义哪些情况下做哪些事情就足够了，比较粗鲁的写法就是：

if

then

else if

then

else if

then

.................

在AI的体系结构又被叫做Author Control （作者控制）。也可以叫做RBS——Rule Based System。

我们要写比较清晰的框架，首先要做的就是把 if部分和then部分隔离成两部分，各成为一个接口，且两者用一个string联系。

由于这部分是比较简单，我们直接上代码：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityECS;
using FreedomAI;


namespace FreedomAI
{
	
	public interface SimpleAIStateJudger
	{
		 string DoJudge(SimpleAI sAI);
	};


	public interface SimpleAIRunner
	{
		 void DoRun (SimpleAI sAI,string statecode);
	};

	public class SimpleAI:UEntity
	{
		public  SimpleAIRunner mSimpleAIRunner;
		public  SimpleAIStateJudger mSimpleAIStateJudger;
		public  GameObject mAIRT;
		public  GameObject mAITemplate;
		public  GameObject mPlayer;
		public  Vector3 GeneratePos;

		public void Init(SimpleAIRunner pSimpleAIRunner,SimpleAIStateJudger pSimpleAIStateJudger,GameObject pAITemplete,GameObject pPlayer,Vector3 pPos)
		{
			mSimpleAIRunner = pSimpleAIRunner;
			mSimpleAIStateJudger = pSimpleAIStateJudger;
			mAITemplate = pAITemplete;
			mPlayer = pPlayer;
			GeneratePos = pPos;
			mAIRT=GameObject.Instantiate (mAITemplate,GeneratePos,Quaternion.identity) as GameObject;
			SimpleAISetSingleton.getInstance ().GetComponent<SimpleAISet> ().mSimpleAIList.Add (this);
			this.AddComponent<AIMove> (new AIMove());
		}

	}

	public class SimpleAISet:UComponent
	{
		public List<SimpleAI> mSimpleAIList = new List<SimpleAI>();
		public List<SimpleAI> LastFrameRemove = new List<SimpleAI> ();

		public void Delete(SimpleAI pSimpleAI)
		{
			LastFrameRemove.Add (pSimpleAI);
		}

		public SimpleAI FindWithRiaus(Vector3 center,float maxdis,LayerMask layermask,string tag)
		{
			Collider[] myCollider = Physics.OverlapSphere (center,maxdis,layermask);
			GameObject fir = null;
			for (int i = 0; i < myCollider.Length; i++)
			{
				if (myCollider [i].gameObject.tag == tag)
				{
					fir = myCollider [i].gameObject;
					break;
				}
			}
			if (fir == null) 
			{
				return null;
			}
			else
			{
				foreach (var v in mSimpleAIList)
				{
					if (v.mAIRT == fir)
					{
						return v;
					}
				}
				return null;
			}
		}

	}

	// Entity for all simple AI

	public class SimpleAISetSingleton:UEntity
	{
		private static SimpleAISetSingleton mSimpleAISetSingleton;

		public static SimpleAISetSingleton getInstance()
		{
			if (mSimpleAISetSingleton == null)
				mSimpleAISetSingleton = new SimpleAISetSingleton ();
			return mSimpleAISetSingleton;
		}

		public override void Init ()
		{
			base.Init ();
			SimpleAISetSingleton.getInstance ().AddComponent<SimpleAISet> (new SimpleAISet ());
			//Debug.Log ("aiInit");
		}

	}


	// simpleAI compute system

	public class SimpleAIComputeSystem:USystem
	{
		public override void Init ()
		{
			base.Init ();
			this.AddRequestComponent (typeof(SimpleAISet));
		}

		public override void Update (UEntity uEntity)
		{
			base.Update (uEntity);

			List<SimpleAI> last = uEntity.GetComponent<SimpleAISet>().LastFrameRemove;
			foreach (var vAI in last)
			{
				uEntity.GetComponent<SimpleAISet> ().mSimpleAIList.Remove (vAI);
				uEntity.mWorld.deleteEntity (vAI);
		//		Debug.Log (uEntity.GetComponent<SimpleAISet> ().mSimpleAIList.Count);
				GameObject.Destroy (vAI.mAIRT);
			}

			last.Clear ();

			List<SimpleAI> tAIList = uEntity.GetComponent<SimpleAISet> ().mSimpleAIList;
			for (int i = 0; i < tAIList.Count; i++)
			{
				string code = tAIList [i].mSimpleAIStateJudger.DoJudge (tAIList[i]);
				tAIList [i].mSimpleAIRunner.DoRun (tAIList[i],code);
			}
		}
			
	}

};

这里注意到，还有一个SimpleAI的Manager一样的类，申明为了单例，可以很容易的管理SimpleAI的移除和添加。