状态机在RPG游戏中的应用举例

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状态机分两种：

(1) Moore状态机: 输出只和当前所处状态有关，而与输入的内容无关。

(2) Mealy状态机：输出与当前所处状态和输入的内容均有关。

状态机要求必须有终节点，当到达综态时，状态机停止。

有限状态机 = 状态 + 事件 + 转换 + 动作

例如RPG中的城门：

状态：Opened，Closed，Unlocked，Locked

事件：openDoor,closeDoor,lockDoor,unlockDoor

转换：两个状态之间的变换；

动作：可以执行的原子操作。

State.java

package hello;public enum State {OPENED,CLOSED,LOCKED,UNLOCKED}

Event.java

public enum Event {open,close,lock,unlock}

FsmState.java

package hello;/** * 城门状态机 * @author henry * */public class FsmState {/** * 当前所处状态 */private State state;public FsmState() {this.state = State.OPENED;}public void enterOpened() {System.out.println("enterOpened");}public void enterLocked() {System.out.println("enterLocked");}public void enterUnlocked() {System.out.println("enterUnlocked");}public void enterClosed() {System.out.println("enterClosed");}/** * 处理事件 * @param e */public void processEvent(Event e) {State oldState = state;boolean pass = false;switch (state) {case CLOSED : {if (e == Event.open) {state = State.OPENED;pass = true;} else if (e == Event.lock) {state = State.LOCKED;pass = true;}} break;case UNLOCKED : {if (e == Event.lock) {state = State.LOCKED;pass = true;} else if (e == Event.open){state = State.OPENED;pass = true;}} break;case LOCKED : {if (e == Event.unlock) {state = State.UNLOCKED;pass = true;}} break;case OPENED : {if (e == Event.close) {state = State.CLOSED;pass = true;}} break;default : break;}if (oldState == state && !pass) {return;}switch (state) {case CLOSED : {enterClosed();} break;case UNLOCKED : {enterUnlocked();} break;case LOCKED : {enterLocked();} break;case OPENED : {enterOpened();} break;default : break;}}}

Test.java

package hello;public class Test {public static void main(String[] args) {FsmState doorState = new FsmState();doorState.processEvent(Event.close);doorState.processEvent(Event.lock);doorState.processEvent(Event.unlock);doorState.processEvent(Event.open);}}

输出结果：

enterClosedenterLockedenterUnlockedenterOpened

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