2
當它碰到牆時，它只是沿着牆壁滾動，但我正在反轉Y座標。此外，您無法同時移動槳。任何提示？我應該創建2個線程嗎？乒乓球沒有從牆上彈開
這裏是我改變Y線後撞到牆上的功能。
public void ballMove(){
if(ballStartY+randomBally > jpH){
randomBally -=4;
}
if(ballStartY+randomBally <0){
randomBally +=4;
}
}
下面是完整的代碼
import java.awt.Color;
import java.awt.Event;
import java.awt.Graphics;
import java.util.Random;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Pong extends JFrame implements ActionListener{
//implement constants
PongPanel pongPanel = new PongPanel();
//JFrame pong x and y coordinates
static final int jfpX = 150;
static final int jfpY = 20;
// JFrame pong width and height
static final int jfpW = 800;
static final int jfpH = 600;
Thread thrd;
public static void main(String[] args) {
Pong jfp = new Pong();
jfp.setVisible(true);
}
public Pong(){
setBounds(jfpX,jfpY,jfpW,jfpH);
setTitle("Pong");
setResizable(false);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setBackground(Color.black);
add(pongPanel);
addKeyListener(pongPanel);
thrd = new Thread (pongPanel);
thrd.start();
}
public void actionPerformed(ActionEvent e) {
}
}
class PongPanel extends JPanel implements Runnable, KeyListener{
Random random = new Random();
static final int jpW = 800;
static final int jpH = 600;
int paddleStart = (jpH/2)-35;
int paddleStarttwo = (jpH/2)-35;
int ballStartX = (jpW/2)-20;
int ballStartY = (jpH/2)-20;
int ytwo,x,y;
int ballD = 30;
int paddleW1 = 20;
int paddleH1 = 100;
int paddleW2 = 20;
int paddleH2 = 100;
int min = -2;
int max = 2;
int randomBallx = random.nextInt(max-min+1)+min;
int randomBally = random.nextInt(max-min+1)+min;
public PongPanel(){
}
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
Color ball;
Color paddleOne;
Color paddleTwo;
ball = new Color(255,0,255);
paddleOne = new Color(255,0,0);
paddleTwo = new Color(0,0,255);
g.setColor(ball);
g.fillOval(ballStartX+randomBallx,ballStartY+randomBally,ballD,ballD);
g.setColor(paddleOne);
g.fillRect(20,paddleStart+y,paddleW1,paddleH1);
g.setColor(paddleTwo);
g.fillRect(760,paddleStarttwo+ytwo,paddleW2,paddleH2);
}
public void run() {
while(true){
randomBall();
ballMove();
repaint();
try {Thread.sleep(75); } catch(Exception e){
};
}
}
public void randomBall(){
if(randomBallx >=0){
randomBallx=+4;
}
if(randomBallx<0){
randomBallx-=4;
}
if(randomBally>=0){
randomBally+=4;
}
if(randomBally<0){
randomBally-=4;
}
// randomBallx+=randomBallx;
// randomBally+=randomBally;
}
public void ballMove(){
if(ballStartY+randomBally > jpH){
randomBally -=4;
}
if(ballStartY+randomBally <0){
randomBally +=4;
}
}
public void keyPressed(KeyEvent e) {
if(e.getKeyCode() == KeyEvent.VK_A){
y-=10;
}
else if(e.getKeyCode() == KeyEvent.VK_S){
y+=10;
}
if(e.getKeyCode() == KeyEvent.VK_QUOTE){
ytwo-=10;
}
else if(e.getKeyCode() == KeyEvent.VK_SEMICOLON){
ytwo+=10;
}
}
public void keyTyped(KeyEvent e) {
}
@Override
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub
}
}
那些變量名......哦，上帝爲什麼...... –
randomY = -randomY。讓我知道你是否想要一個徹底的解釋，我會爲你輸入一個例子。 –
哦，我只是看看你的代碼，我相信你使用的是錯誤的操作符。 randomY - = 4將讀取randomY的值減去4，然後將新值存儲在randomY中，它與randomY = randomY - 4相同。我不認爲這就是您要做的。我會使用速度變量dx和dy，然後當發生碰撞時根據牆壁設置dx = -dx或dy = -dy，那麼x + = dx和y + = dy應該始終保持球向正確的方向移動。 –