我在为我的XNA项目创建一个简单的AI。

我的敌人应该在短时间后从右向左移动。

不幸的是，我的代码跳过了我的第一个和第二个Do-While循环，所以我的敌人没有移动：< 5秒钟。所以他只是从+-1.X位置跳跃

while (i <= 1)    {        EnemyVelocity.X += 1f;        timer += (float)gameTime.ElapsedGameTime.TotalSeconds;        usedTimeRight = timer;        i++;    }     if (usedTimeRight != 0)     {        do        { EnemyVelocity.X -= 1f;          timer += (float)gameTime.ElapsedGameTime.TotalSeconds;        } while ((timer - usedTimeRight) >= 5);        usedTimeLeft = timer;        usedTimeRight = 0;    }    if (usedTimeLeft != 0)    {        do        { EnemyVelocity.X += 1f;          timer += (float)gameTime.ElapsedGameTime.TotalSeconds;        }        while (timer - usedTimeLeft >= 5);        usedTimeRight = timer;        usedTimeLeft= 0;    }

更新…~~~~~~~~~~~

所以，现在又出现了另一个问题 – 我的敌人一直在向左移动

timer += (float)gameTime.ElapsedGameTime.TotalSeconds;while (i <= 1)    {        EnemyVelocity.X -= 1f;        timer += (float)gameTime.ElapsedGameTime.TotalSeconds;        usedTimeRight = timer;        i++;    }    if (usedTimeRight != 0 && (timer - usedTimeRight <= 2))    {         int x;        for (x = 0; x <= 3; x++)        {            EnemyVelocity.X = 1;        }        usedTimeLeft = timer;        usedTimeRight = 0;    }  if (usedTimeLeft != 0 && (timer - usedTimeLeft <= 2))    {        int x;        for (x = 0; x <= 3; x++)        {            EnemyVelocity.X = - 1;        }        usedTimeRight = timer;        usedTimeLeft = 0;    }

回答：

问题在于初始的while循环迭代速度太快，以至于在usedTimeRight = timer > 0之前就退出了while循环。这意味着你的第一个和第二个if语句将为假，因为useTimeLeft和useTimeRight总是0。尝试更改这一点，使Timer变量在声明时等于1。

例如：

  float timer = 1f;  while (i <= 1 )             {                EnemyVelocity.X += 1f;                timer += (float)gameTime.ElapsedGameTime.TotalSeconds;                usedTimeRight = timer;                i++;            }             if (usedTimeRight != 0)             {                do                { EnemyVelocity.X -= 1f;                  timer += (float)gameTime.ElapsedGameTime.TotalSeconds;                } while ((timer - usedTimeRight) >= 5);                usedTimeLeft = timer;                usedTimeRight = 0;            }            if (usedTimeLeft != 0)            {                do                { EnemyVelocity.X += 1f;                  timer += (float)gameTime.ElapsedGameTime.TotalSeconds;                }                while (timer - usedTimeLeft >= 5);                usedTimeRight = timer;                usedTimeLeft= 0;            }