即使矩形被点击，我的屏幕不会重画

我有我的代码设置为布尔boxDetect将设置为true，如果在矩形startButton中单击鼠标。其余的只是格式化没有什么特别的！这是在矩形内按下之前的初始屏幕，并且一旦在矩形内按下，它应该在400,400点将屏幕重新绘制成矩形。即使矩形被点击，我的屏幕不会重画

import javax.swing.*; 
import java.awt.*; 
import java.awt.event.MouseEvent; 
import java.awt.event.MouseListener; 
import java.io.*; 

public class spaceInvadersIntroScreen implements MouseListener 
{ 
    private JFrame frame; 
    private MyPanel panel; 
    private double startButtonX = 0; 
    private double startButtonY = 0; 
    private Rectangle startButton; 
    private Boolean boxDetect = false; 

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

public spaceInvadersIntroScreen() 
{ 
    frame = new JFrame("Space Invaders"); 
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize(); 
    startButtonX = screenSize.getWidth()/2; //Finds the X value of the center of the screen 
    startButtonY = screenSize.getHeight()/2; //Finds the Y value of the center of the screen 
    frame.setSize(screenSize); //width and height 
    panel = new MyPanel(); 
    frame.getContentPane().add(panel); 
    frame.setVisible(true); 
    startButton = new Rectangle((int)(startButtonX - 200), (int)(startButtonY - 75), 400, 150); //Creates Rectangle in the middle of the screen 
} 

class MyPanel extends JPanel 
{ 
    private static final long serialVersionUID = 1L; 

    public void paint(Graphics g) 
    { 

    if(boxDetect == false) 
    { 
     Graphics2D g2d = (Graphics2D) g; 
     //Background 
     g2d.setColor(Color.BLACK); 
     g2d.fillRect(0,0, 1440, 870); 

     //Code for an X centered title regardless of the screen length 

     String title = "SPACE INVADERS"; 
     Font textFont = new Font("monospaced", Font.BOLD, 150); 
     FontMetrics textMetrics = g2d.getFontMetrics(textFont); 
     g2d.setFont(textFont); 

     int centeredX = (this.getWidth()/2) - (textMetrics.stringWidth(title)/2); 

     //Prints SPACE INVADERS to the screen 
     g2d.setColor(Color.WHITE); 
     g2d.setFont(textFont); 
     g2d.drawString(title, centeredX, 200); 

     //draw the Button 
     g2d.setColor(Color.white); 
     g2d.fill(startButton); 
    } 

    else 
    { 
     g.setColor(Color.black); 
     g.drawRect(400, 400, 400, 400); 
    } 

    } 
} 

@Override 
public void mouseReleased(MouseEvent e) 
{ 
    double xCoord = e.getX(); 
    double yCoord = e.getY(); 
    if(startButton.contains(xCoord,yCoord) == true) 
    { 
     boxDetect = true; 
    } 
    panel.repaint(); 
} 

@Override 
public void mouseClicked(MouseEvent e) {} 

@Override 
public void mousePressed(MouseEvent e) {} 

@Override 
public void mouseEntered(MouseEvent e) {} 

@Override 
public void mouseExited(MouseEvent e) {} 
}

来源

2013-04-27 Escap3faith

谢谢！我是一个新的程序员，这是我的第一年，所以我总是忘记小事情。 – Escap3faith 2013-04-27 04:34:31

您需要添加的MouseListener的为它工作。问题：你在哪里打电话addMouseListener(...)？答：你没有。解决方案：调用此方法将MouseListener添加到需要它的组件。

来源

2013-04-27 04:30:29

即使矩形被点击，我的屏幕不会重画

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