/// <summary>
/// 这个方法为有限状态机置入新的状态
/// 或者在该状态已经存在于列表中时打印错误信息
/// 第一个添加的状态也是最初的状态!
/// </summary>
public void AddState(RoleFSMState s)
{
//在添加前检测空引用
if (s == null)
{
Debug.LogError("FSM ERROR: Null reference is not allowed");
}
//被装在的第一个状态也是初始状态
//这个状态便是状态机开始时的状态
if (states.Count == 0)
{
states.Add(s);
CurrentState = s;
CurrentStateID = s.ID;
return;
}
//如果该状态未被添加过，则加入集合
for (int i = 0; i < states.Count; i++)
{
if (states[i].ID == s.ID)
{
Debug.LogError("FSM ERROR: Impossible to add state " + s.ID.ToString() +
" because state has already been added");
return;
}
}
states.Add(s);
}
/// <summary>
/// 状态改变
/// </summary>
public void SwitchTransition(RoleTransition trans, Entity entity)
{
//在改变当前状态前检测NullTransition
if (trans == RoleTransition.NullTransition)
{
Debug.LogError("FSM ERROR: NullTransition is not allowed for a real transition");
return;
}
//在改变当前状态前检测当前状态是否可作为过渡的参数
RoleStateID id = CurrentState.GetOutputState(trans);
if (id == RoleStateID.NullStateID)
{
Debug.LogError("FSM ERROR: State " + CurrentStateID.ToString() + " does not have a target state " +
" for transition " + trans.ToString());
return;
}
if (id == CurrentStateID)
{
//Debug.LogError("FSM ERROR:Current State is same state " + CurrentStateID.ToString());
return;
}
//更新当前的状态个和状态编号
CurrentStateID = id;
for (int i = 0; i < states.Count; i++)
{
if (states[i].ID == CurrentStateID)
{
//离开旧状态执行方法
CurrentState.OnExit(entity);
CurrentState = states[i];
//进入新的状态
CurrentState.OnEnter(entity);
break;
}
}
}