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我很困惑为什么我的记分牌没有在屏幕上更新。分数越来越高（我使用调试器进行了检查，球也处于中心位置）。但记分牌没有更新在所有它不断地说： “0：0”得分不更新在傍
傍类
package com.dheraxysgames.pong;
import java.awt.Dimension;
import javax.swing.JFrame;
public class Pong extends JFrame{
private static final long serialVersionUID = 1L;
//Set Resolution
public static final int width = 300,
height = width/4 * 3,
scale = 3;
public Pong() {
Dimension size = new Dimension(width * scale, height * scale);
setSize(size);
setTitle("PONG");
setResizable(false);
setVisible(true);
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
add(new GamePanel());
}
public static int getWindowWidth(){
return width * scale;
}
public static int getWindowHeight(){
return height * scale;
}
public static void main(String[] args) {
new Pong();
}
}
的GamePanel类
package com.dheraxysgames.pong;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JPanel;
import javax.swing.Timer;
public class GamePanel extends JPanel implements ActionListener, KeyListener {
private static final long serialVersionUID = 1L;
Ball ball = new Ball();
Player player = new Player();
AI ai = new AI(this);
public GamePanel(){
Timer time = new Timer(50, this);
time.start();
this.addKeyListener(this);
this.setFocusable(true);
}
private void update(){
player.update();
ai.update();
ball.update();
ball.checkCollision(player);
ball.checkCollision(ai);
}
public void paintComponent(Graphics g){
super.paintComponent(g);
g.setColor(Color.BLACK);
g.fillRect(0, 0, Pong.getWindowWidth(), Pong.getWindowHeight());
g.setColor(Color.WHITE);
Font font = new Font("IMMORTAL", Font.BOLD, 50);
g.setFont(font);
g.drawString(player.score + " : " + ai.score, Pong.getWindowWidth()/2 - 60, 50);
player.paint(g);
ai.paint(g);
ball.paint(g);
}
public Ball getBall(){
return ball;
}
public void actionPerformed(ActionEvent e) {
update();
repaint();
}
//Keyboard
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_UP) player.setYVelocity(-10);
if (e.getKeyCode() == KeyEvent.VK_DOWN) player.setYVelocity(10);
}
public void keyReleased(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_UP) player.setYVelocity(0);
if (e.getKeyCode() == KeyEvent.VK_DOWN) player.setYVelocity(0);
}
public void keyTyped(KeyEvent e) {
}
}
Player类
package com.dheraxysgames.pong;
import java.awt.Color;
import java.awt.Graphics;
public class Player {
public int score = 0;
private static int width = 50,
height = 150;
private int x = 800, y = (Pong.getWindowHeight()/2) - (height/2),
yV = 0;
public Player() {
}
public void update(){
y += yV;
}
public void paint(Graphics g){
g.setColor(Color.GREEN);
g.fillRect(x, y, width, height);
}
public int getX(){
return x;
}
public int getY(){
return y;
}
public int getWidth(){
return width;
}
public int getHeight(){
return height;
}
public void setYVelocity(int speed){
yV = speed;
}
}
AI类
package com.dheraxysgames.pong;
import java.awt.Color;
import java.awt.Graphics;
public class AI {
public int score = 0;
private static int width = 50,
height = 150;
private GamePanel field;
private int x = 50, y = (Pong.getWindowHeight()/2) - (height/2),
yV = 0;
public AI(GamePanel game) {
this.field = game;
}
public AI(){
}
public void update(){
if(field.getBall().getY() < this.y) yV = -8;
if(field.getBall().getY() > this.y) yV = 8;
y += yV;
}
public void paint(Graphics g){
g.setColor(Color.GREEN);
g.fillRect(x, y, width, height);
}
public int getX(){
return x;
}
public int getY(){
return y;
}
public int getWidth(){
return width;
}
public int getHeight(){
return height;
}
public void setYVelocity(int speed){
yV = speed;
}
}
球类
package com.dheraxysgames.pong;
import java.awt.Color;
import java.awt.Graphics;
public class Ball {
private int x = Pong.getWindowWidth()/2, y = Pong.getWindowHeight()/2,
xV = 10, yV = 10;
private static int size = 40;
Player player = new Player();
AI ai = new AI();
public void update() {
x += xV;
y += yV;
if (x < 0){
reverseXDirection();
player.score++;
x = Pong.getWindowWidth()/2;
y = Pong.getWindowHeight()/2;
}
if (x > Pong.getWindowWidth() - size){
reverseXDirection();
ai.score++;
x = Pong.getWindowWidth()/2;
y = Pong.getWindowHeight()/2;
}
if (y < 0 || y > Pong.getWindowHeight() - size - 38) reverseYDirection();
}
public void paint(Graphics g){
g.setColor(Color.GREEN);
g.fillOval(x, y, size, size);
}
private void reverseXDirection(){
xV = -xV;
}
private void reverseYDirection(){
yV = -yV;
}
public void checkCollision(Player p) {
if (this.x + size > p.getX() && this.x + size < p.getX() + p.getWidth()){
if (this.y + size > p.getY() && this.y + size < p.getY() + p.getHeight()){
reverseXDirection();
}
}
}
public void checkCollision(AI ai) {
if (this.x > ai.getX() && this.x < ai.getX() + ai.getWidth()){
if (this.y > ai.getY() && this.y < ai.getY() + ai.getHeight()){
reverseXDirection();
}
}
}
public int getX(){
return x;
}
public int getY(){
return y;
}
}
您在添加内容前设置可见？ – Li357
我没有真正注意到它有所作为。 – Dheraxys