java - MouseClicked() 方法不适用于寻路算法？

Question

我正在尝试编写一个寻路迷宫算法，以尝试将 A* 实现到 JPanel 接口(interface)中。代码如下。如您所见，我使用随机数生成器随机生成迷宫方 block 的颜色。以下是源代码的基本实现:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Scanner; 
import java.util.Random;


public class algo extends JPanel
implements MouseListener, MouseMotionListener
{


static int[][] map;

public void paintComponent(Graphics g) {
    super.paintComponent(g);
    this.setBackground(Color.WHITE);

    //draw a for loop to print the map
    for (int i = 0; i < map.length; i++) {
        for(int j = 0; j < map[i].length; j++) {
            g.setColor(Color.WHITE);

            if(map[i][j] == 1) {
                g.setColor(Color.BLACK);
            }

            g.fillRect(j * 20, i * 20, map[i].length * 20, map.length *20);

        }
    }

}

public static void main(String[] args) {
    System.out.println("Welcome to the A* Shortest Pathfinding Robot Program \n *****"
            + "**************************"
            + "********************\n");
    System.out.println("How large would you like your graph to be? Enter 2 consecutive numbers, one for length, one for width:\n");
    Scanner sizeScan = new Scanner(System.in);
    int length = sizeScan.nextInt();
    int width = sizeScan.nextInt();
    map = new int[length][width];
    Random gridGenerate = new Random();
    for(int i = 0; i < map.length; i++) {
        for (int j = 0; j < map[i].length; j++) {
            map[i][j] = gridGenerate.nextInt(2);
            System.out.print(map[i][j] + " ");
        }
        System.out.println();

    }
    JFrame f = new JFrame("A Star Pathfinder");
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    algo star = new algo();
    f.add(star);
    f.setSize(length * 20, width * 20);
    f.setVisible(true);

}

@Override
public void mouseDragged(MouseEvent e) {}

@Override
public void mouseMoved(MouseEvent e) {}

@Override
public void mouseClicked(MouseEvent e) {
    System.out.println("Successfully Clicked");
    if (SwingUtilities.isLeftMouseButton(e)) {
        System.out.println("This is the left mouse button that is clicked");
    }
    }



@Override
public void mouseEntered(MouseEvent e) {}

@Override
public void mouseExited(MouseEvent e) {}

@Override
public void mousePressed(MouseEvent e) {}

@Override
public void mouseReleased(MouseEvent e) {}

}

当我运行 main() 方法时，我能够成功生成迷宫:

Here is the "Maze" Generated from the code

但是，当我尝试在迷宫上实现 MouseClick() 操作时，没有任何反应。我有打印语句来尝试测试这一点，并且每种可能的解决方案都没有解决问题。

1. 尝试在主代码中实现 run() 方法
2. 尝试在类中实现 run() 方法
3. 尝试创建私有(private)处理程序类？

关于为什么 mouseHandler 没有响应我的请求还有其他想法吗？

Answer 1

您必须显式地将鼠标监听器添加到 JPanel。

public class algo extends JPanel implements MouseListener, MouseMotionListener {

    public algo() {
        this.addMouseListener(this);
        this.addMouseMotionListener(this);
    }
    // other stuff
}