《Java 核心技术 卷1》 笔记 第九章扩展 总结扫雷小项目（3） 效果调整+右键显示小旗子

9.8.5 效果调整

数字都冒出来，事实上显示内容太多了。如果出现数字，我们希望不继续扫描，增加可玩性：

private void dfs(int i, int j){
        if(i<0 || i >= row || j < 0 || j >= col || visited[i][j] || hasSweeper[i][j])
            return;
        visited[i][j] = true;
        JButton b = posSweeper.get(i).get(j);
        b.setEnabled(false);
        --last;

        int sweepCnt = getSweepCnt(i,j);
        if(sweepCnt>0){
            b.setText(""+sweepCnt);
            return;
        }
        for(int x = 0; x < 4; x++){
            int l = i+direction[x];
            int c = j+direction[x+1];
            dfs(l,c);
        }
    }

然后是雷的问题，点到雷应该显示所有雷的位置，那我们记录一下所有雷的位置

 List allSweeps = new ArrayList<>();
 allSweeps.add(new int[]{x,y});
 for(int [] sweepPos:allSweeps){
                    posSweeper.get(sweepPos[0]).get(sweepPos[1]).setIcon(new ImageIcon("src/resource/p1.png"));
}

9.8.6 立 flag

玩的时候希望能打标记标记推出的非雷区，方便识别。

ActionListener 就不太好用了，我们用 MouseListener 的 mouseClicked， 其中 MouseEvent.BUTTON1 代表左键，MouseEvent.BUTTON3 代表右键

图片来源：https://www.iconfont.cn/search/index?searchType=icon&q=旗子

我们把之前的部分拷贝到左键，右键部分直接返回，右键一次立下旗子，两次取消

class Sweeper extends MouseAdapter {

        @Override
        public void mouseClicked(MouseEvent e) {
            int c = e.getButton();
            JButton b = (JButton) e.getSource();
            if (c == MouseEvent.BUTTON1){ //左键
                int[] pos = sweeperPos.get(b);
                int i = pos[0];
                int j = pos[1];

                if(hasSweeper[i][j]){
                    for(int [] sweepPos:allSweeps){
                        posSweeper.get(sweepPos[0]).get(sweepPos[1]).setIcon(new ImageIcon("src/resource/p1.png"));
                    }
                    int selection = JOptionPane.showConfirmDialog(MineSweeperframe.this,"你输了！","结果",
                            JOptionPane.DEFAULT_OPTION);
                    init();

                }else {
                    dfs(i,j);
                    if(last == sweepCnt){
                        int selection = JOptionPane.showConfirmDialog(MineSweeperframe.this,"你赢了！太棒了！","结果",
                                JOptionPane.DEFAULT_OPTION);
                        init();

                    }
                }
            }else if(c==MouseEvent.BUTTON3){//右键
                if(b.getIcon()==null)
                    b.setIcon(new ImageIcon("src/resource/flag.png"));
                else
                    b.setIcon(null);
            }
        }

    }

完整代码：

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.*;
import java.util.List;

public class Main {
    public static  void main(String[] args) {
        Main solution = new Main();

        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                MineSweeperframe MineSweeperframe = new MineSweeperframe();
                MineSweeperframe.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE);
                MineSweeperframe.setVisible(true);
            }
        });
    }

}

class MineSweeperframe extends Jframe {
    public static final int W = 500;
    public static final int H = 500;
    Map sweeperPos = new HashMap<>();
    Map> posSweeper = new HashMap<>();
    boolean[][] hasSweeper;
    boolean[][] visited;
    int sweepCnt = 30;
    int row = 10;
    int col = 10;
    int last = row*col;
    private final int[] direction = new int[]{-1,0,1,0,-1};
    List allSweeps = new ArrayList<>();
    Random r = new Random();
    public MineSweeperframe(){
        setTitle("扫雷游戏");
        setSize(W,H);
        setLayout(new GridLayout(row,col));
        for(int i = 0; i < row; i++){
            for(int j = 0; j < col; j++){
                JButton button = new JButton();
                add(button);
                sweeperPos.put(button,new int[]{i,j});
                button.addMouseListener(new Sweeper());
                int[] xy = sweeperPos.get(button);
                posSweeper.putIfAbsent(xy[0],new HashMap<>());
                posSweeper.get(xy[0]).put(xy[1],button);
            }
        }

        init();
    }

    private void init(){
        last = 100;
        for(JButton button:sweeperPos.keySet()){
            button.setEnabled(true);
            button.setIcon(null);
            button.setText("");


        }


        hasSweeper = new boolean[row][col];
        visited = new boolean[row][col];
        allSweeps.clear();
        setSweeps();

    }

    private void setSweeps(){
        int x = 0;
        int y = 0;
        int total = row*col;
        for(int i = 0; i < sweepCnt; i++){
            do{
                int pos = r.nextInt(total);
                x = pos/col;
                y = pos%col;
            }while (hasSweeper[x][y]);
            hasSweeper[x][y] = true;
            allSweeps.add(new int[]{x,y});
        }

        //输出，检查效果用
        for(int i = 0; i < row; i++){
            System.out.println(Arrays.toString(hasSweeper[i]));
        }
    }

    class Sweeper extends MouseAdapter {

        @Override
        public void mouseClicked(MouseEvent e) {
            int c = e.getButton();
            JButton b = (JButton) e.getSource();
            if (c == MouseEvent.BUTTON1){ //左键
                int[] pos = sweeperPos.get(b);
                int i = pos[0];
                int j = pos[1];

                if(hasSweeper[i][j]){
                    for(int [] sweepPos:allSweeps){
                        posSweeper.get(sweepPos[0]).get(sweepPos[1]).setIcon(new ImageIcon("src/resource/p1.png"));
                    }
                    int selection = JOptionPane.showConfirmDialog(MineSweeperframe.this,"你输了！","结果",
                            JOptionPane.DEFAULT_OPTION);
                    init();

                }else {
                    dfs(i,j);
                    if(last == sweepCnt){
                        int selection = JOptionPane.showConfirmDialog(MineSweeperframe.this,"你赢了！太棒了！","结果",
                                JOptionPane.DEFAULT_OPTION);
                        init();

                    }
                }
            }else if(c==MouseEvent.BUTTON3){//右键
                if(b.getIcon()==null)
                    b.setIcon(new ImageIcon("src/resource/flag.png"));
                else
                    b.setIcon(null);
            }
        }

    }

    private void dfs(int i, int j){
        if(i<0 || i >= row || j < 0 || j >= col || visited[i][j] || hasSweeper[i][j])
            return;
        visited[i][j] = true;
        JButton b = posSweeper.get(i).get(j);
        b.setEnabled(false);
        --last;

        int sweepCnt = getSweepCnt(i,j);
        if(sweepCnt>0){
            b.setText(""+sweepCnt);
            return;
        }
        for(int x = 0; x < 4; x++){
            int l = i+direction[x];
            int c = j+direction[x+1];
            dfs(l,c);
        }
    }

    private int getSweepCnt(int x, int y){
        int cnt = 0;
        for(int i = x-1; i <= x+1; i++){
            for(int j = y-1; j <= y+1; j++){
                if(i==x&&y==j) continue;
                if(i<0 || i >= row || j < 0 || j >= col) continue;
                if(hasSweeper[i][j]){
                    ++cnt;
                }
            }
        }
        return cnt;
    }
}

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