更新屏幕與MouseMotionListener

我的問題是爲什麼不會paddleOne移動鼠標？是否因爲圖形沒有更新？更新屏幕與MouseMotionListener

package ballGame; 

import javax.swing.*; 
import java.awt.*; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.awt.event.MouseEvent; 
import java.awt.event.MouseMotionListener; 

public class BallGame extends Canvas implements MouseMotionListener{ 
ball position 
private int ballX,ballY; 
ball dimension 
private int ballWidth = 20, ballHeight = 20; 
paddleOne position 
private int paddleOneX, paddleOneY; 
paddleOne dimension 
private int paddleOneWidth = 10, paddleOneHeight = 80; 

paddleTwo position 
private int paddleTwoX, paddleTwoY; 
paddleTwo dimension 
private int paddleTwoWidth = 10, paddleTwoHeight = 80; 

border position 
private int borderX, borderY; 
border dimension 
private int borderWidth = 2, borderHeight = 70; 
border space 
private int borderSpace = 18; 

private Timer timer; 
private final int interval = 1000, fps = 30; 

public BallGame(int width, int height){ 
    setVisible(true); 
    setSize(width,height); 
    setBackground(Color.BLACK); 

    ActionListener repaint = new ActionListener() { 
     @Override 
     public void actionPerformed(ActionEvent e) { 
      repaint(); 
     } 
    }; 
    timer = new Timer(Math.round(interval/fps),repaint); 
    timer.start(); 
    this.addMouseMotionListener(this); 
}

更新圖形

public void update(Graphics g){ 
    paint(g); 
    } 

public void paint(Graphics g){ 

    ballX = getWidth()/2 - ballWidth/2; 
    ballY = getHeight()/2 - ballHeight/2; 

    borderX = getWidth()/2 - borderWidth/2; 
    borderY = 0; 

    paddleOneX = 2; 
    paddleOneY = getHeight()/2 - paddleOneHeight/2; 

    paddleTwoX = getWidth() - 2 - paddleTwoWidth; 
    paddleTwoY = getHeight()/2 - paddleTwoHeight/2; 

    //Border 
    g.setColor(Color.WHITE); 
    g.fillRect(borderX,borderY,borderWidth,borderHeight); 

    borderY += borderSpace + borderHeight; 

    g.setColor(Color.WHITE); 
    g.fillRect(borderX,borderY,borderWidth,borderHeight); 

    borderY += borderSpace + borderHeight; 

    g.setColor(Color.WHITE); 
    g.fillRect(borderX,borderY,borderWidth,borderHeight); 

    borderY += borderSpace + borderHeight; 

    g.setColor(Color.WHITE); 
    g.fillRect(borderX,borderY,borderWidth,borderHeight); 

    borderY += borderSpace + borderHeight; 

    g.setColor(Color.WHITE); 
    g.fillRect(borderX,borderY,borderWidth,borderHeight); 

    borderY += borderSpace + borderHeight; 

    g.setColor(Color.WHITE); 
    g.fillRect(borderX,borderY,borderWidth,borderHeight); 

    borderY += borderSpace + borderHeight; 

    g.setColor(Color.WHITE); 
    g.fillRect(borderX,borderY,borderWidth,borderHeight); 
    // 

    //ball 
    g.setColor(Color.WHITE); 
    g.fillOval(ballX,ballY ,ballWidth,ballHeight); 
    // 

    //paddle One 
    g.setColor(Color.WHITE); 
    g.fillRoundRect(paddleOneX,getPaddleOneY(),paddleOneWidth,paddleOneHeight,5,5); 
    // 

    //paddle Two 
    g.setColor(Color.WHITE); 
    g.fillRoundRect(paddleTwoX,paddleTwoY,paddleTwoWidth,paddleTwoHeight,5,5); 
    // 

} 

private int getPaddleOneY() { 
    return paddleOneY; 
} 


@Override 
public void mouseDragged(MouseEvent e) { 
    System.out.println("Dragged"); 
}

更新槳的y位置

@Override 
public void mouseMoved(MouseEvent e) { 
    paddleOneY = e.getY() - paddleOneWidth/2; 
    System.out.println(paddleOneY); 

} 

}

來源

2016-09-28 wolowiz68

正確的代碼：包球賽;

import javax.swing.*; 
import java.awt.*; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.awt.event.MouseEvent; 
import java.awt.event.MouseMotionListener; 


public class BallGame extends Canvas implements MouseMotionListener{ 

//ball position 
private int ballX,ballY; 
//ball dimension 
private int ballWidth = 20, ballHeight = 20; 

//paddleOne position 
private int paddleOneX, paddleOneY; 
//paddleOne dimension 
private int paddleOneWidth = 10, paddleOneHeight = 80; 

//paddleTwo position 
private int paddleTwoX, paddleTwoY; 
//paddleTwo dimension 
private int paddleTwoWidth = 10, paddleTwoHeight = 80; 

//border position 
private int borderX, borderY; 
//border dimension 
private int borderWidth = 2, borderHeight = 70; 
//border space 
private int borderSpace = 18; 

private Timer timer; 
private final int interval = 1000, fps = 30; 

public BallGame(int width, int height){ 
    setVisible(true); 
    setSize(width,height); 
    setBackground(Color.BLACK); 

    ActionListener repaint = new ActionListener() { 
     @Override 
     public void actionPerformed(ActionEvent e) { 
      repaint(); 
     } 
    }; 
    timer = new Timer(Math.round(interval/fps),repaint); 
    timer.start(); 
    this.addMouseMotionListener(this); 
} 

public void update(Graphics g){ 
    paint(g); 
} 

public void paint(Graphics g){ 

    ballX = getWidth()/2 - ballWidth/2; 
    ballY = getHeight()/2 - ballHeight/2; 

    borderX = getWidth()/2 - borderWidth/2; 
    borderY = 0; 

    paddleOneX = 2; 
    paddleOneY = getHeight()/2 - paddleOneHeight/2; 

    paddleTwoX = getWidth() - 2 - paddleTwoWidth; 
    paddleTwoY = getHeight()/2 - paddleTwoHeight/2; 

    //Border 
    g.setColor(Color.WHITE); 
    g.fillRect(borderX,borderY,borderWidth,borderHeight); 

    borderY += borderSpace + borderHeight; 

    g.setColor(Color.WHITE); 
    g.fillRect(borderX,borderY,borderWidth,borderHeight); 

    borderY += borderSpace + borderHeight; 

    g.setColor(Color.WHITE); 
    g.fillRect(borderX,borderY,borderWidth,borderHeight); 

    borderY += borderSpace + borderHeight; 

    g.setColor(Color.WHITE); 
    g.fillRect(borderX,borderY,borderWidth,borderHeight); 

    borderY += borderSpace + borderHeight; 

    g.setColor(Color.WHITE); 
    g.fillRect(borderX,borderY,borderWidth,borderHeight); 

    borderY += borderSpace + borderHeight; 

    g.setColor(Color.WHITE); 
    g.fillRect(borderX,borderY,borderWidth,borderHeight); 

    borderY += borderSpace + borderHeight; 

    g.setColor(Color.WHITE); 
    g.fillRect(borderX,borderY,borderWidth,borderHeight); 
    // 

    //ball 
    g.setColor(Color.WHITE); 
    g.fillOval(ballX,ballY ,ballWidth,ballHeight); 
    // 

    //paddle One 
    g.setColor(Color.WHITE); 
    g.fillRoundRect(paddleOneX,getPaddleOneY(),paddleOneWidth,paddleOneHeight,5,5); 
    // 

    //paddle Two 
    g.setColor(Color.WHITE); 
     g.fillRoundRect(paddleTwoX,paddleTwoY,paddleTwoWidth,paddleTwoHeight,5,5); 
    // 

} 

private int getPaddleOneY() { 
    return paddleOneY; 
} 


@Override 
public void mouseDragged(MouseEvent e) { 
    System.out.println("Dragged"); 
} 

@Override 
public void mouseMoved(MouseEvent e) { 
    paddleOneY = e.getY() - paddleOneWidth/2; 
    System.out.println(paddleOneY); 

} 
}

來源

2016-09-28 08:14:20 wolowiz68

更新屏幕與MouseMotionListener

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