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112 lines
3.0 KiB
112 lines
3.0 KiB
/* |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License as published by the |
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* Free Software Foundation; either version 2 of the License, or (at |
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* your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software Foundation, |
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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* |
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* In addition, as a special exception, the author gives permission to |
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* link the code of this program with the Half-Life Game Engine ("HL |
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* Engine") and Modified Game Libraries ("MODs") developed by Valve, |
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* L.L.C ("Valve"). You must obey the GNU General Public License in all |
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* respects for all of the code used other than the HL Engine and MODs |
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* from Valve. If you modify this file, you may extend this exception |
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* to your version of the file, but you are not obligated to do so. If |
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* you do not wish to do so, delete this exception statement from your |
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* version. |
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* |
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*/ |
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#ifndef SIMPLE_STATE_MACHINE_H |
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#define SIMPLE_STATE_MACHINE_H |
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#ifdef _WIN32 |
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#pragma once |
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#endif |
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// Encapsulation of a finite-state-machine state |
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template<typename T> |
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class SimpleState |
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{ |
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public: |
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SimpleState() { m_parent = NULL; } |
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virtual ~SimpleState() {}; |
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virtual void OnEnter(T userData) {}; // when state is entered |
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virtual void OnUpdate(T userData) {}; // state behavior |
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virtual void OnExit(T userData) {}; // when state exited |
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virtual const char *GetName() const = 0; // return state name |
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void SetParent(SimpleState<T> *parent) |
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{ |
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m_parent = parent; |
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} |
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SimpleState<T> *GetParent() const |
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{ |
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return m_parent; |
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} |
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private: |
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// the parent state that contains this state |
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SimpleState<T> *m_parent; |
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}; |
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// Encapsulation of a finite state machine |
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template<typename T, typename S> |
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class SimpleStateMachine |
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{ |
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public: |
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SimpleStateMachine() |
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{ |
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m_state = NULL; |
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} |
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void Reset(T userData) |
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{ |
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m_userData = userData; |
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m_state = NULL; |
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} |
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// change behavior state - WARNING: not re-entrant. Do not SetState() from within OnEnter() or OnExit() |
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void SetState(S *newState) |
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{ |
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if (m_state) |
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m_state->OnExit(m_userData); |
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newState->OnEnter(m_userData); |
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m_state = newState; |
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m_stateTimer.Start(); |
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} |
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// how long have we been in the current state |
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float GetStateDuration() const |
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{ |
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return m_stateTimer.GetElapsedTime(); |
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} |
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// return true if given state is current state of machine |
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bool IsState(const S *state) const |
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{ |
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return (state == m_state); |
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} |
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// execute current state of machine |
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void Update() |
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{ |
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if (m_state) |
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m_state->OnUpdate(m_userData); |
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} |
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/*protected:*/ |
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S *m_state; // current behavior state |
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IntervalTimer m_stateTimer; // how long have we been in the current state |
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T m_userData; |
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}; |
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#endif // SIMPLE_STATE_MACHINE_H
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