将 MouseMotionListener 添加到球拍(Java 乒乓球游戏)
Adding MouseMotionListener to paddle (Java Pong Game)
我搜索了整个网络试图找到解决方案,但最终我变得更加困惑和沮丧。我正在尝试让桨移动 (paddle_y)。桨不需要 x 坐标,它只需要在垂直线上上下移动。我不知道 mouseListener 需要什么语法才能让我的桨移动。如果可能,请提供示例或解决方案。非常感谢,任何帮助表示赞赏。
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.event.MouseMotionListener;
import java.awt.event.MouseEvent;
public class PongGame extends JFrame implements Runnable, MouseMotionListener {
int ball_x, ball_y, ball_dx, ball_dy;
int ball_r;
int x_left, x_right, y_top, y_bottom;
int paddle_y = 30;
/**
* Constructor
*/
public PongGame(){
init();
}
/**
* UI
*/
protected void init(){
this.setSize(300,300);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
int curX = -1, curY = -1;
ball_x = this.getWidth()/2;
ball_y = this.getHeight()/2;
ball_dx = ball_dy = 2;
ball_r = 20;
this.setVisible(true);
getFocus(this);
x_left = this.getInsets().left;
x_right = this.getWidth() - this.getInsets().right - ball_r;
y_top = this.getHeight() - this.getInsets().top + ball_r/3;
y_bottom = this.getInsets().bottom + ball_r;
addMouseMotionListener(this);
}
public void mouseMoved(MouseEvent e) {
//help
}
public void mouseDragged(MouseEvent e) {
//help
}
/**
* helper method which we use to get the focus
*/
public void getFocus(final JFrame frame)
{
EventQueue.invokeLater(new Runnable() {
public void run() {
frame.requestFocus();
}
});
}
/**
* implementation of the Runnable interface to be able to move the ball, etc.
*/
public void run(){
while(true){
ball_x += ball_dx;
if(ball_x <= x_left || ball_x >= x_right){
ball_dx *=-1;
ball_x += (2*ball_dx);
}
ball_y += ball_dy;
if(ball_y <= y_bottom || ball_y >= y_top){
ball_dy *=-1;
ball_y += (2*ball_dy);
}
repaint();
try{
Thread.sleep(50);
}catch(InterruptedException ex){
System.out.println(ex);
}
}
}
/**
* all rendering occurs here
*/
public void paint(Graphics g){
//Color paddleOne;
//paddleOne = new Color(0);
g.setColor(Color.white);
g.fillRect(0,0,this.getWidth(),this.getHeight());
g.setColor(Color.black);
g.fillOval(ball_x,ball_y, ball_r, ball_r);
g.setColor(Color.black);
g.fillRect(0,paddle_y,20,70);
}
/**
* entry point into the program
*/
public static void main(String[] args){
// create the class
PongGame application = new PongGame();
new Thread(application).start();
}
}
桨:
int paddle_y = 30;
g.setColor(Color.black);
g.fillRect(0,paddle_y,20,70);
public void mouseMoved(MouseEvent e) {
//help
}
public void mouseDragged(MouseEvent e) {
//help
}
Paddle
class 需要 JFrame
class 的实例才能添加鼠标侦听器。如果将 JFrame
对象传递给构造函数,则可以使用以下代码:
public class Paddle {
private JFrame frame;
private int paddle_y;
public Paddle(JFrame frame) {
this.frame = frame;
this.paddle_y = 30; //Or whatever number you want
frame.addMouseMotionListener(new MouseMotionListener() {
public void mouseMoved(MouseEvent e) {
Paddle.this.paddle_y = e.getY(); //When the mouse is moved, it will call on this function to change the Paddle.paddle_y variable.
}
public void mouseDragged(MouseEvent e){} //This reacts when the mouse is clicked, moved, then released.
}
}
这应该替换 Paddle class,并且它应该在移动鼠标时更改 paddle_y 变量。
编辑:如果您不想创建新的 class,请将其放入 JFrame class:
int paddle_y;
this.addMouseMotionListener(new MouseMotionListener() {
public void mouseMoved(MouseEvent e) {
paddle_y = e.getY(); //When the mouse is moved, it will call on this function to change the paddle_y variable (Within the JFrame class).
}
然后渲染的时候就可以调用paddle_y变量了
我搜索了整个网络试图找到解决方案,但最终我变得更加困惑和沮丧。我正在尝试让桨移动 (paddle_y)。桨不需要 x 坐标,它只需要在垂直线上上下移动。我不知道 mouseListener 需要什么语法才能让我的桨移动。如果可能,请提供示例或解决方案。非常感谢,任何帮助表示赞赏。
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.event.MouseMotionListener;
import java.awt.event.MouseEvent;
public class PongGame extends JFrame implements Runnable, MouseMotionListener {
int ball_x, ball_y, ball_dx, ball_dy;
int ball_r;
int x_left, x_right, y_top, y_bottom;
int paddle_y = 30;
/**
* Constructor
*/
public PongGame(){
init();
}
/**
* UI
*/
protected void init(){
this.setSize(300,300);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
int curX = -1, curY = -1;
ball_x = this.getWidth()/2;
ball_y = this.getHeight()/2;
ball_dx = ball_dy = 2;
ball_r = 20;
this.setVisible(true);
getFocus(this);
x_left = this.getInsets().left;
x_right = this.getWidth() - this.getInsets().right - ball_r;
y_top = this.getHeight() - this.getInsets().top + ball_r/3;
y_bottom = this.getInsets().bottom + ball_r;
addMouseMotionListener(this);
}
public void mouseMoved(MouseEvent e) {
//help
}
public void mouseDragged(MouseEvent e) {
//help
}
/**
* helper method which we use to get the focus
*/
public void getFocus(final JFrame frame)
{
EventQueue.invokeLater(new Runnable() {
public void run() {
frame.requestFocus();
}
});
}
/**
* implementation of the Runnable interface to be able to move the ball, etc.
*/
public void run(){
while(true){
ball_x += ball_dx;
if(ball_x <= x_left || ball_x >= x_right){
ball_dx *=-1;
ball_x += (2*ball_dx);
}
ball_y += ball_dy;
if(ball_y <= y_bottom || ball_y >= y_top){
ball_dy *=-1;
ball_y += (2*ball_dy);
}
repaint();
try{
Thread.sleep(50);
}catch(InterruptedException ex){
System.out.println(ex);
}
}
}
/**
* all rendering occurs here
*/
public void paint(Graphics g){
//Color paddleOne;
//paddleOne = new Color(0);
g.setColor(Color.white);
g.fillRect(0,0,this.getWidth(),this.getHeight());
g.setColor(Color.black);
g.fillOval(ball_x,ball_y, ball_r, ball_r);
g.setColor(Color.black);
g.fillRect(0,paddle_y,20,70);
}
/**
* entry point into the program
*/
public static void main(String[] args){
// create the class
PongGame application = new PongGame();
new Thread(application).start();
}
}
桨:
int paddle_y = 30;
g.setColor(Color.black);
g.fillRect(0,paddle_y,20,70);
public void mouseMoved(MouseEvent e) {
//help
}
public void mouseDragged(MouseEvent e) {
//help
}
Paddle
class 需要 JFrame
class 的实例才能添加鼠标侦听器。如果将 JFrame
对象传递给构造函数,则可以使用以下代码:
public class Paddle {
private JFrame frame;
private int paddle_y;
public Paddle(JFrame frame) {
this.frame = frame;
this.paddle_y = 30; //Or whatever number you want
frame.addMouseMotionListener(new MouseMotionListener() {
public void mouseMoved(MouseEvent e) {
Paddle.this.paddle_y = e.getY(); //When the mouse is moved, it will call on this function to change the Paddle.paddle_y variable.
}
public void mouseDragged(MouseEvent e){} //This reacts when the mouse is clicked, moved, then released.
}
}
这应该替换 Paddle class,并且它应该在移动鼠标时更改 paddle_y 变量。
编辑:如果您不想创建新的 class,请将其放入 JFrame class:
int paddle_y;
this.addMouseMotionListener(new MouseMotionListener() {
public void mouseMoved(MouseEvent e) {
paddle_y = e.getY(); //When the mouse is moved, it will call on this function to change the paddle_y variable (Within the JFrame class).
}
然后渲染的时候就可以调用paddle_y变量了