XMotion處理JComponents

Question

我遇到了麻煩。我想在我的JFrame contentPane中添加一個矩形到我的JPanel。我希望這個x在一個pos位置，但移動-x並重新啓動，其中+ x開始。即如果我有一個800 x 400的JPanel，我想讓rext接受這些參數，但是沿着x軸（x-Velx）移動，在800處重新繪製自己，並沿着-x方向繼續。我知道這不是足夠的信息，我所觸摸的書中沒有一本是基於我正在嘗試做的，因此我缺乏適當的術語。

Answer 1

//這裏是這樣

公共類AnimatedBoat {

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

public AnimatedBoat() { 
    EventQueue.invokeLater(new Runnable() { 
     @Override 
     public void run() { 
      try { 
       UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
      } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { 
      } 

      JFrame frame = new JFrame("Test"); 
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
      frame.setLayout(new BorderLayout()); 
      frame.add(new AnimationPane()); 
      frame.pack(); 
      frame.setLocationRelativeTo(null); 
      frame.setVisible(true); 
     } 

    }); 
} 

public class AnimationPane extends JPanel { 

    private BufferedImage boat; 
    private int xPos = 0; 
    private int direction = 1; 

    public AnimationPane() { 
     try { 
      boat = ImageIO.read(new File("boat.png")); 
      Timer timer = new Timer(40, new ActionListener() { 
       @Override 
       public void actionPerformed(ActionEvent e) { 
        xPos += direction; 
        // change directions off window width 
        if (xPos + boat.getWidth() > getWidth()) { 
         xPos = getWidth() - boat.getWidth(); 
         direction *= -1; 
        } else if (xPos < 0) { 
         xPos = 0; 
         direction *= -1; 
        } 
        repaint(); 
       } 

      }); 
      timer.setRepeats(true); 
      timer.setCoalesce(true); 
      timer.start(); 
     } catch (IOException ex) { 
      ex.printStackTrace(); 
     } 
    } 

    @Override 
    public Dimension getPreferredSize() { 
     return boat == null ? super.getPreferredSize() : new Dimension(boat.getWidth() * 4, boat.getHeight()); 
    } 

    @Override 
    protected void paintComponent(Graphics g) { 
     super.paintComponent(g); 

     int y = getHeight() - boat.getHeight(); 
     g.drawImage(boat, xPos, y, this); 

    } 

} 

}