ゲーム開発でよく使うステートマシンクラス。
いつも使っているソースコードを載せておきます。
/**
* ステートマシンで取り扱われる状態を表すクラス
*
* @author munomura
* @version $Id: State.java 181 2010-04-25 15:23:58Z nomusanjp $
*/
public abstract class State {
public void enter(O owner){}
public void execute(O owner){}
public void exit(O owner){}
}
/**
* ゲームのNPCなどステートマシンを表すクラス
*
* @author munomura
* @version $Id: StateMachine.java 181 2010-04-25 15:23:58Z nomusanjp $
*/
public class StateMachine{
public O own;
public State global;
public State current;
public State previous;
boolean isFirstUpdate=true;
public StateMachine(O own){
this.own = own;
}
public void setCurrentState(State s){current = s;}
public void setGlobalState(State s){global = s;}
public void setPreviousState(State s){previous = s;}
public State getCurrentState(){return current;}
public State getGlobalState(){return global;}
public State getPreviousState(){return previous;}
public void update() {
if(isFirstUpdate){
if(global != null)global.enter(own);
if(current != null)current.enter(own);
isFirstUpdate = false;
}else{
if(global != null)global.execute(own);
if(current != null)current.execute(own);
}
}
public void changeState(State newState){
if(newState == null)return;
if(global != null)global.exit(own);
if(current != null)current.exit(own);
previous = current;
current = newState;
if(global != null)global.enter(own);
if(current != null)current.enter(own);
isFirstUpdate = false;
isFirstUpdate = false;
}
public void revertToPreviousState(){
changeState(previous);
}
boolean isInState(State st){
return st.equals(current);
}
/**
* グローバルと初期ステートを同時に設定する。
* AI初期化時に使用。
*
* @param global
* @param firstState
*/
public void setupState(State global, State firstState){
isFirstUpdate = true;
this.global = global;
this.current = firstState;
}
}
public class Dog extends NPC implements Recycleable {
protected StateMachine stateMachine = new StateMachine(this);
@Override
public void updateState(){
stateMachine.update();
}
}
public class DogRound extends State
public static DogRound state = new DogRound();
@Override
public void enter(Dog own){
}
@Override
public void execute(Dog own){
}
@Override
public void exit(Dog own){
}
}
