Created
June 20, 2013 00:25
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State machine!
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| using UnityEngine; | |
| using System.Collections; | |
| using System.Collections.Generic; | |
| /* State Template | |
| * | |
| // IDLE STATE | |
| bool enterIDLE () | |
| { | |
| return true; | |
| } | |
| bool updateIDLE () | |
| { | |
| float x = Input.GetAxisRaw("Horizontal"); | |
| if(x != 0) | |
| stateMachine.ChangeState(enterWALK, updateWALK, exitWALK); | |
| return false; | |
| } | |
| bool exitIDLE () | |
| { | |
| return true; | |
| } | |
| */ | |
| // Defines the required parameters and return value type for a StateMachine state. | |
| public delegate void ImmediateStateDelegate (); | |
| // To use, create an instance of StateMachine inside of a MonoBehaviour, load it up with | |
| // references to state methods with ChangeState(), then call its Execute() method during the | |
| // MonoBehaviour's Update cycle. An example MonoBehaviour is included at the bottom of this file. | |
| public class ImmediateStateMachine | |
| { | |
| // These states will be cached when calling ChangeState(). | |
| // The Execute() method will execute onUpdate() of the current state on each update, | |
| // running whatever method is stored there. | |
| ImmediateStateDelegate enter; | |
| ImmediateStateDelegate update; | |
| ImmediateStateDelegate exit; | |
| // Change state from the previous state, if any, and begin working in the new state. | |
| // The previous state's onExit() and the new state's onEnter() will both be called. | |
| public void ChangeState (ImmediateStateDelegate enter, ImmediateStateDelegate update, ImmediateStateDelegate exit) | |
| { | |
| // If a state is currently running, it should be allowed to gracefully exit | |
| // before the next state takes over | |
| if (this.exit != null) | |
| this.exit(); | |
| // Cache the given state values | |
| this.enter = enter; | |
| this.update = update; | |
| this.exit = exit; | |
| // If a state isn't currently running, we can immediately switch to our entering | |
| // state using the state delegates we cached a few lines above | |
| if (this.enter != null) | |
| this.enter(); | |
| } | |
| // Call this during | |
| public void Execute () | |
| { | |
| if (this.update != null) | |
| this.update(); | |
| } | |
| public bool IsUsingThisUpdateDelegate(ImmediateStateDelegate update) | |
| { | |
| return (this.update == update); | |
| } | |
| } | |
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