Unity3D - P&D自动过河

Unity3D学习 - P&D有限状态机

---

视频地址
GITHUB地址

---

主要代码实现

状态转换图

1. 本次作业要求实现自动过河的牧师与魔鬼有限状态机。主要是在之前实现过的牧师与魔鬼运动分离版的基础上，对原代码进行修改，以提供方法给自动过河类AutoMove来调用。

2. 本次的重点AutoMove类。首先该类设计为单例模式，通过静态变量autoMove来调用该类的方法。然后声明所需变量。

       public static AutoMove autoMove = new AutoMove();
       public FirstController firstScene;
       private int devilNum;
       private int priestNum;
       private int BoatCoast; // -1 -> left, 1 -> right.
       //P：船运载一个牧师
       //D：船运载一个恶魔
       //PP：船运载两个牧师
       //DD：船运载两个恶魔
       //PD：船运载一个牧师，一个恶魔
       private enum Boataction {empty, P, D, PP, DD, PD }
       private bool isFinished = true;
       private Boataction nextState;
       private int count = 0;
       private int num = 0;
   
       private AutoMove() { }

3. 然后是每次点击Next按钮将会直接调用的move函数，该函数首先调用getNext函数得到当前岸边的状态，确认接下来要进行的过程，再调用DoAction函数执行流程。

       public void move()
       {
           if (isFinished)
           {
               isFinished = false;
               Debug.Log(count);
               int[] fromCount = firstScene.fromCoast.GetobjectsNumber();
               priestNum = fromCount[0];
               devilNum = fromCount[1];
               BoatCoast = firstScene.boat.get_State();
               if (count == 0)
               {
                   nextState = getNext();
                   if ((int)nextState >= 3)
                   {
                       num = 2;
                   }
                   else if ((int)nextState > 0) num = 1;
                   else num = 0;
                   count++;
               }
               Debug.Log("next state is " + nextState);
               DoAction();
           }
       }

4. DoACtion主要是按顺序调用各种模拟点击动作。

       private void DoAction()
       {
           if (count == 1 && num != 0)
           {
               if (nextState == Boataction.D)
               {
                   devilOnBoat();
               }
               else if (nextState == Boataction.DD)
               {
                   devilOnBoat();
               }
               else if (nextState == Boataction.P)
               {
                   priestOnBoat();
               }
               else if (nextState == Boataction.PP)
               {
                   priestOnBoat();
               }
               else if (nextState == Boataction.PD)
               {
                   priestOnBoat();
               }
               count++;
           }
           else if (num == 2 && count == 2)
           {
               if (nextState == Boataction.DD)
               {
                   devilOnBoat();
               }
               else if (nextState == Boataction.PP)
               {
                   priestOnBoat();
               }
               else if (nextState == Boataction.PD)
               {
                   devilOnBoat();
               }
               count++;
           }
           else if((num == 1 && count == 2) || (num == 2 && count == 3) || (num == 0 && count == 1))
           {
               firstScene.MoveBoat();
               count++;
           }
           else if ((num == 1 && count >= 3) || (num == 2 && count >= 4) || (num == 0 && count>=2))
           {
               GetOffBoat();
           }
           isFinished = true;
       }

5. DoAction函数进行的动作分为三种，第一种devilOnBoat模拟点击魔鬼让其上船，第二种priestOnBoat模拟点击天使，第三种船移动。

       private void GetOffBoat()
       {
           if((priestNum == 0 && devilNum == 2) || (priestNum == 0 && devilNum == 0))
           {
               if (firstScene.boat.get_State() == -1)
               {
                   foreach (var x in firstScene.boat.passenger)
                   {
                       if (x != null)
                       {
                           firstScene.ObjectIsClicked(x);
                           break;
                       }
                   }
                   if (firstScene.boat.isEmpty()) count = 0;
               }
               else count = 0;
           }
           else if (((priestNum == 0 && devilNum == 1)) && firstScene.boat.get_State() == 1)
           {
               count = 0;
           }
           else
           {
               foreach (var x in firstScene.boat.passenger)
               {
                   if (x != null && x.getType() == 1)
                   {
                       firstScene.ObjectIsClicked(x);
                       count = 0;
                       break;
                   }
               }
               if (count != 0)
               {
                   foreach (var x in firstScene.boat.passenger)
                   {
                       if (x != null)
                       {
                           firstScene.ObjectIsClicked(x);
                           count = 0;
                           break;
                       }
                   }
               }
           }
       }
   
       private void priestOnBoat()
       {
           if(BoatCoast == 1)
           {
               foreach(var x in firstScene.fromCoast.passengerPlaner)
               {
                   if (x!=null && x.getType() == 0)
                   {
                       firstScene.ObjectIsClicked(x);
                       return;
                   }
               }
           }
           else
           {
               foreach (var x in firstScene.toCoast.passengerPlaner)
               {
                   if (x != null && x.getType() == 0)
                   {
                       firstScene.ObjectIsClicked(x);
                       return;
                   }
               }
           }
       }
   
       private void devilOnBoat()
       {
           if (BoatCoast == 1)
           {
               foreach (var x in firstScene.fromCoast.passengerPlaner)
               {
                   if (x != null && x.getType() == 1)
                   {
                       firstScene.ObjectIsClicked(x);
                       return;
                   }
               }
           }
           else
           {
               foreach (var x in firstScene.toCoast.passengerPlaner)
               {
                   if (x != null && x.getType() == 1)
                   {
                       firstScene.ObjectIsClicked(x);
                       return;
                   }
               }
           }
       }

6. 得到下一步的方法根据状态图确认下一步进行的操作和目标。

       private Boataction getNext()
       {
           Boataction next = Boataction.empty;
           if (BoatCoast == 1)
           {
               if (devilNum == 3 && priestNum == 3)//3P3DB
               {
                   next = Boataction.PD;
               }
               else if (devilNum == 2 && priestNum == 3)//3P2DB
               {
                   next = Boataction.DD;
               }
               else if (devilNum == 1 && priestNum == 3)//3P1DB
               {
                   next = Boataction.PP;
               }
               else if (devilNum == 2 && priestNum == 2)//2P2DB
               {
                   next = Boataction.PP;
               }
               else if (devilNum == 3 && priestNum == 0)//3DB
               {
                   next = Boataction.DD;
               }
               else if (devilNum == 1 && priestNum == 1)//1P1DB
               {
                   next = Boataction.PD;
               }
               else if (devilNum == 2 && priestNum == 0)//2DB
               {
                   next = Boataction.D;
               }
               else if (devilNum == 1 && priestNum == 2)//2P1DB
               {
                   next = Boataction.P;
               }
               else if (devilNum == 2 && priestNum == 1)//1P2DB
               {
                   next = Boataction.P;
               }
               else if (devilNum == 1 && priestNum == 0)//1DB
               {
                   next = Boataction.D;
               }
               else if(devilNum == 3 && priestNum == 2)//2P3DB
               {
                   next = Boataction.D;
               }
               else next = Boataction.empty;
           }
           else
           {
               if (devilNum == 2 && priestNum == 2)//2P2D
               {
                   next = Boataction.empty;
               }
               else if (devilNum == 1 && priestNum == 3)//3P1D
               {
                   next = Boataction.empty;
               }
               else if (devilNum == 2 && priestNum == 3)//3P2D
               {
                   next = Boataction.D;
               }
               else if (devilNum == 0 && priestNum == 3)//3P
               {
                   next = Boataction.empty;
               }
               else if (devilNum == 1 && priestNum == 1)//1P1D
               {
                   next = Boataction.D;
               }
               else if (devilNum == 2 && priestNum == 0)//2D
               {
                   next = Boataction.D;
               }
               else if (devilNum == 1 && priestNum == 0)//1D
               {
                   next = Boataction.empty;
               }
               else next = Boataction.empty;
           }
           return next;
       }

---

这次初步实现了简单的“智能”系统，这种系统可以方便的运用于对付简单NPC智能。这次是在之前作业基础上实现的，实现的时候因为第一次没考虑给这次留接口，所以写的时候还是挺困难的，以后要注意一下。

---