使用AWT将Scrollpane嵌入绘画区域

Question

我在图像中有一个AWT Applet。整个区域可用于绘制一些东西。现在我想在它前面嵌入一个ScrollPane。但滚动会产生影响，画面会被覆盖。

所以我需要一种方法来嵌入一个不影响底层绘画的组件。我完全不熟悉这些东西了。摇摆是别无选择。代码添加在底部。

谢谢。

Normal

Scroll Error

public class AWT extends Applet {   

    Dimension offDimension;
    Image offImage;
    Graphics offGraphics;
    Panel panel = new Panel();

    ScrollPane scrollpane = new ScrollPane(ScrollPane.SCROLLBARS_ALWAYS);

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

    public void update(Graphics g) {
        if ((offGraphics == null) || (500 != offDimension.width)
            || (500 != offDimension.height)) {
            Dimension d = new Dimension(500,500);
            offDimension = d;
            offImage = createImage(500, 500);
            offGraphics = offImage.getGraphics();
        }
        redraw(offGraphics);
        g.drawImage(offImage, 0, 0, this);
    }

    public void init() {
        ScrollPane sp = new ScrollPane(ScrollPane.SCROLLBARS_ALWAYS); 
        Panel p = new Panel();
        TextArea a = new TextArea();
        a.setText("AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA");

        sp.add(a);      
        sp.setSize(300, 300);
        add(sp);
    }

    public void redraw(Graphics g) {
        g.drawRect(50, 50, 55, 55);
        g.setColor(Color.BLUE);
            g.fillRoundRect(0 , 0, 200, 200, 200, 200);
    }
}