[問題] java load image 的問題

[howay0516 (想賺錢的找我就對了)]

抱歉我吧整段code貼上來

我目前用java.awt 將圖片load近來

我這段程式的功能是用滑鼠滾輪切換圖片

目前已經可以做到偵測到滑鼠滾輪

切換圖片的部分有個bug

就是我滑鼠假設我滾了一格 我設計上是要由example1.jpg 切換到 example2.jpg

但在視窗中(textArea)中圖不會改變 不過如果移動視窗或是改變視窗大小

圖就會變成我想要的(例：滑鼠滾輪動一格 圖片不會變 但改變視窗大小後

圖就變成example2.jpg了)

我在想說是不是我的Show_off_test中 改變圖片時 沒有辦法及時flush??

我用的OS是vista-32bit 會不會是OS的問題= =詭異的bug 大家幫幫我吧 謝謝





public class MouseWheelEventDemo extends JPanel
                            implements MouseWheelListener {
    JTextArea textArea;
    JScrollPane scrollPane;
    final static String newline = "\n";
    private static ImageDelegate mImage;
    static JFrame frame = new JFrame("Project 2007.4.7");
    static Graphics g;
    static String[] names = {"example1.jpg","example2.jpg","example3.jpg","example4.jpg","example5.jpg"};
    int count = 0;
    public MouseWheelEventDemo() {
        super(new BorderLayout());

        textArea = new JTextArea();
        textArea.setEditable(false);
        scrollPane = new JScrollPane(textArea);
        scrollPane.setVerticalScrollBarPolicy(
                JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        scrollPane.setSize( new Dimension (1024,768));
        add(scrollPane, BorderLayout.CENTER);

        //Register for mouse-wheel events on the text area.
        textArea.addMouseWheelListener(this);


        setPreferredSize(new Dimension(1024, 768));
        setBorder(BorderFactory.createEmptyBorder(20,20,20,20));
    }

    public void mouseWheelMoved(MouseWheelEvent e){
      // String message;


       int notches = e.getWheelRotation();

       if (notches == -1){
           count--;
       }
       else{
           count++;
       }
       if( count > 4 )
           count = 0;
       else if( count < 0)
           count = 4;

       ShowOff_test( names[ count ]);
       System.out.println("TEST: " + names[ count ]);



    }


        public void paint( Graphics g ) {

                Graphics2D g2 = (Graphics2D)g;

                // Turn on antialiasing.
                g2.setRenderingHint( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON );
                g2.drawImage( MouseWheelEventDemo.mImage.getImage(), 0, 0, null );
                //frame.dispose();
        //g2.dispose();
        }


        public static void ShowOff_test( String filename) {



                try {
                        final Image image = ImageIO.read( new File( filename ) );
                        mImage = (
                                new ImageDelegate() {
                                        public Image getImage() { return image; }
                                }

                        );

                //this.setSize( mImage.getWidth( null ), mImage.getHeight( null ) );
                } catch ( Exception _ ) {
                        throw new RuntimeException( _ );
                }


        }


    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
    private static void createAndShowGUI() {

        //Create and set up the window.

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Create and set up the content pane.
        JComponent newContentPane = new MouseWheelEventDemo();
        newContentPane.setOpaque(false); //content panes must be opaque
        frame.setContentPane(newContentPane);

        //Display the window.
        frame.pack();
        //frame.update(mImage.getGraphics());
        frame.dispose();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.

        ShowOff_test( names[ 0 ]);

        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}


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