java - 如何检查击键序列

Question

我正在制作游戏并想实现像 Konami 代码这样的作弊代码。

但是我如何检查击键序列呢？

我希望它能正常工作，以便玩家只要输入代码就会触发。

提前致谢!

Answer 1

下面是一个检查 Konami 代码的类，包括“UP、UP、UP、DOWN 等情况。”

这应该适用于任何给定的序列。

import java.util.Map;
import java.util.TreeMap;

public class Konami {

    static private int[] code = 
        {UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, B};
    static private Map<Integer, Integer>[] graph;
    static private int currentNode = 0;

    public static void main(String args[]) {
        //Create graph
        graph = generateSequenceMap(code);

        //Call checkKonami(key) whenever a key is pressed
    }


    static public boolean checkKonami(int keyPressed) {
        Integer nextNode = graph[currentNode].get(keyPressed);

        //Set currentNode to nextNode or to 0 if no matching sub-sequence exists
        currentNode = (nextNode==null ? 0 : nextNode);

        return currentNode == code.length-1;
    }


    static private Map<Integer, Integer>[] generateSequenceMap(int[] sequence) {

        //Create map
        Map<Integer, Integer>[] graph = new Map[sequence.length];
        for(int i=0 ; i<sequence.length ; i++) {
            graph[i] = new TreeMap<Integer,Integer>();
        }

        //i is delta
        for(int i=0 ; i<sequence.length ; i++) {
            loop: for(int j=i ; j<sequence.length-1 ; j++) {
            if(sequence[j-i] == sequence[j]) {
                System.out.println("If at Node "+j+" you give me seq["+(j-i+1) 
                        + "] OR " + (sequence[j-i+1]) + " , goto Node " + (j-i+1));

                //Ensure that the longest possible sub-sequence is recognized
                Integer value = graph[j].get(sequence[j-i+1]);
                if(value == null || value < j-i+1)
                    graph[j].put(sequence[j-i+1], j-i+1);
            }
            else
                break loop;
            }
        }
        return graph;
    }
}