隨機敵人模式

Question

我想要一個隨機移動我的敵人的模式，因爲當我有3或4個敵人時，他們看起來像是同一個敵人的移動。 這是我的隨機碼：

  int seed = unchecked(System.DateTime.Now.Ticks.GetHashCode()); 
     rand = new Random(seed); 

這裏過程的代碼，此舉：

public void move(GameTime time, WorldScreen screen) 
    { 
     timer += (float)time.ElapsedGameTime.TotalMilliseconds; 
     if (timer > 2000) 
     { 
      switch (rand.Next(0, 3)) 
      { 
       case 0: 
        base.direction = Enemy.Direction.down; 
        break; 
       case 1: 
        base.direction = Enemy.Direction.right; 
        break; 
       case 2: 
        base.direction = Enemy.Direction.left; 
        break; 
       case 3: 
        base.direction = Enemy.Direction.up; 
        break; 

      } 
      timer = 0; 
     } 
     timer1 += (float)time.ElapsedGameTime.TotalMilliseconds; 
     if (timer1 > 50) 
     { 
      timer1 = 0; 
      if (direction == Enemy.Direction.down) 
      { 
       if (!MoveCollision(new Vector2(position.X, position.Y + speed), screen)) 
       { 
        base.position.Y += speed; 
        ActualAnimation = getAnimation("rundown"); 
       } 
       else 
       { 
        base.direction = Enemy.Direction.right; 
       } 
      } 
      if (direction == Enemy.Direction.up) 
      { 
       if (!MoveCollision(new Vector2(position.X, position.Y - speed), screen)) 
       { 
        base.position.Y -= speed; 
        ActualAnimation = getAnimation("runup"); 
       } 
       else 
       { 
        base.direction = Enemy.Direction.down; 
       } 
      } 
      if (direction == Enemy.Direction.right) 
      { 
       if (!MoveCollision(new Vector2(position.X + speed, position.Y), screen)) 
       { 
        base.position.X += speed; 
        ActualAnimation = getAnimation("runright"); 
       } 
       else 
       { 
        base.direction = Enemy.Direction.left; 
       } 
      } 
      if (direction == Enemy.Direction.left) 
      { 
       if (!MoveCollision(new Vector2(position.X - speed, position.Y), screen)) 
       { 
        base.position.X -= speed; 
        ActualAnimation = getAnimation("runleft"); 
       } 
       else 
       { 
        base.direction = Enemy.Direction.up; 
       } 

      } 
     } 
     ActualAnimation.update(time, position); 
    } 

但是這個代碼只是做了在房間內的所有敵人相同的模式。 thx幫助我。

Answer 1

我相信在這個

int seed = unchecked(System.DateTime.Now.Ticks.GetHashCode()); rand = new Random(seed);` 

檢查問題的規定，如果你多次調用它太接近的時間。如果那這樣你會得到

rand.Next(0, 3) 

每次調用時相同的隨機數，你會得到相同的號碼，因此，你會得到每一個敵人相同的模式。

Similar question

Answer 2

好吧，我解決了這一個把一個櫃檯上的閱讀器做這樣的種子（這是對在地圖讀者）：

int id = map.Layers[1].Tiles[i].Gid; 
      if (id == 172) 
      { 
       enemys.Add(new Hero.World.Entitys.Enemys.Octorock(new Vector2((int)position.X + map.Layers[1].Tiles[i].X * 16, (int)position.Y + map.Layers[1].Tiles[i].Y * 16),i)); 

      } 

而在此之後的構造的敵人是這樣的：

public Octorock(Vector2 position,int i) :base(position) 
    { 
     int seed = unchecked(System.DateTime.Now.Millisecond); 
     rand = new Random(seed*i);}