actionListener在调用frm Jframe时在JPanel上执行两次]

Question

我想给我的吃豆精灵制作动画，但是当我的计时器调用actionperformed来更新图像时，它会执行两次并跳过动画

这是我的主班代码

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.concurrent.TimeUnit;
import javax.swing.Timer;

public class Pacman extends JFrame implements ActionListener, KeyListener{
    public static Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();  
    public static int FRAME_HEIGHT = (int)(dim.height-dim.height/5);
    public static int FRAME_WIDTH = (int)(dim.width-dim.width/5);
    public static Pacman frame = new Pacman();
    public static Game gameInterface = new Game();
    public static Timer timer;

    public Pacman() {
        super("Pac-man");
        timer = new Timer(175, this);
        timer.start();
        addKeyListener(this);
    }

    public static void main(String[] args) {
        ImageIcon frameIcon = new ImageIcon("Icon.png");

        frame.setSize(FRAME_WIDTH,FRAME_HEIGHT);
        frame.setIconImage(frameIcon.getImage());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
        frame.setResizable(false);

        frame.setContentPane(gameInterface);
        gameInterface.requestFocus();
        gameInterface.setFocusable(true);


        Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();    
        int JframeX = (dim.width-FRAME_WIDTH)/2;
        int JframeY = (dim.height-FRAME_HEIGHT)/2;
        frame.setLocation(JframeX, JframeY);
    }

    public void keyTyped(KeyEvent e) {
    }

    public void keyPressed(KeyEvent e) {
    }

    public void keyReleased(KeyEvent e) {
    }

    public void paint(Graphics g) {
        super.paint(g);     
    }

    public void actionPerformed(ActionEvent ev){
        repaint();
    }
}

这是我的游戏类的代码

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.concurrent.TimeUnit;
import javax.swing.Timer;

public class Game extends JPanel implements ActionListener, KeyListener{
    public static Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();  
    public static int FRAME_HEIGHT = (int)(dim.height-dim.height/5);
    public static int FRAME_WIDTH = (int)(dim.width-dim.width/5);
    public static Game gamePanel = new Game();
    public static Timer timer;
    public static boolean gameExit = false;
    public static int animCounter = 0, imgPacmanX1 = 840, imgPacmanY1 = 0, imgPacmanX2 = 890, imgPacmanY2 = 50;

    public Game() {
        timer = new Timer(500, this);
        timer.start();      
        addKeyListener(this);
    }

    public static void main(String[] args) {    
    }

    public void keyTyped(KeyEvent e) {
    }

    public void keyPressed(KeyEvent e) {
    }

    public void keyReleased(KeyEvent e) {
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);

        ImageIcon animations = new ImageIcon("Pacman_Animations.png");

        g.setColor(Color.BLUE);
        g.fillRect(0, 0, FRAME_WIDTH, FRAME_HEIGHT);
        g.drawImage(animations.getImage(), 150, 200, 200, 250, imgPacmanX1, imgPacmanY1, imgPacmanX2, imgPacmanY2, null);
    }

    public void actionPerformed(ActionEvent ev){
        if(animCounter == 2){
            imgPacmanY1 = 0;
            imgPacmanY2 = 50;
            animCounter = 0;
        }
        else{
            imgPacmanY1 += 50; 
            imgPacmanY2 += 50;
            animCounter += 1;
        }
        repaint();
        System.out.print(imgPacmanY1 + "   " + imgPacmanY2 + "    ");
    }
}

如果我单独运行游戏类，则ActionListener可以正常工作，并且只能执行一次，但是从我的主类调用后，actionListener可以执行两次，动画开始跳过帧。

我希望为pacman sprite制作动画，但是当我的计时器调用actionperformed更新图像时，它会执行两次并跳过动画，这是我的主类import java.awt。*的代码； ...

Answer 1

您有两个Timer，每个都触发一个repaint，并且……欢迎来到您的体系结构为何出错的奇妙世界。