保持按鈕旋轉圖像

Question

我試圖在Java上爲我的盜賊機器創建一個保持按鈕，按下時它將保存該圖像，其他2個圖像將保持旋轉。任何人都知道允許這種情況發生的代碼？

if (e.getSource()== btnaddcash){ 
       txtbalance.setForeground(Color.red); 
       cash = cash + 100; 
       txtbalance.setText(cash + ""); 

if (e.getSource() == btnpic1){ 

Answer 1

的基本概念是，你要旋轉的圖像（或者採取一些行動），而按鈕是「武裝」。

您可以實現此目的的一種方法是將ChangeListener添加到按鈕並監視ButtonModel#isArmed狀態。

public class ChangeButton { 

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

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

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

    public class SlotPaneextends JPanel { 

     private SpinPane spinPane; 
     private JButton button; 

     public SlotPane() { 
      spinPane = new SpinPane(); 
      button = new JButton("Press"); 
      // I've attached directly to the model, I don't 
      // think this is required, simply attaching a change 
      // listener to the button achieve the same result. 
      button.getModel().addChangeListener(new ChangeListener() { 
       @Override 
       public void stateChanged(ChangeEvent e) { 
        spinPane.setSpinning(button.getModel().isArmed()); 
       } 
      }); 

      setLayout(new BorderLayout()); 
      add(spinPane); 
      add(button, BorderLayout.SOUTH); 
     } 
    } 

    public class SpinPane extends JPanel { 

     private BufferedImage mole; 
     private Timer timer; 
     private float angel = 0; 

     public SpinPane() { 
      try { 
       mole = ImageIO.read(new File("mole.png")); 
      } catch (IOException ex) { 
       ex.printStackTrace(); 
      } 
      timer = new Timer(15, new ActionListener() { 
       @Override 
       public void actionPerformed(ActionEvent e) { 
        angel += 15; 
        repaint(); 
       } 
      }); 
      timer.setRepeats(true); 
      timer.setCoalesce(true); 
     } 

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

     public void setSpinning(boolean spinning) { 
      if (spinning) { 
       if (!timer.isRunning()) { 
        timer.restart(); 
       } 
      } else { 
       timer.stop(); 
      } 
      repaint(); 
     } 

     @Override 
     protected void paintComponent(Graphics g) { 
      super.paintComponent(g); 
      if (mole != null) { 

       int x = (getWidth() - mole.getWidth())/2; 
       int y = (getHeight() - mole.getHeight())/2; 
       Graphics2D g2d = (Graphics2D) g.create(); 
       g2d.setTransform(AffineTransform.getRotateInstance(Math.toRadians(angel), getWidth()/2, getHeight()/2)); 
       g2d.drawImage(mole, x, y, this); 
       g2d.dispose(); 

      } 
     } 
    } 
}