How to prevent of disappearing my original image?

[Bobby Marvikuan]

Hello. Can you help me with my method... I have a panel that draws some image and I need to add there something like a zoombox which appears when the user drags the mouse when I am creating my box my original image disappears. I understand why but I don't see a way to save both image and box. May be you can help=/ Cheers in advance!

class LabelDemo extends JLabel{
	Rectangle currentRect = null;
    Rectangle rectToDraw = null;
    Rectangle previousRectDrawn = new Rectangle();
    JPanel panel;
	public LabelDemo(JPanel panel, ImageIcon image){
	//	this.image = image;
		super(image);
		this.panel = panel;
		setOpaque(true);
		setMinimumSize(new Dimension(10,10));
		MyListener myListener = new MyListener();
        addMouseListener(myListener);
        addMouseMotionListener(myListener);
        panel.add(this);
        // panel.add(this);
	}
	class MyListener extends MouseInputAdapter{
		public void mousePressed(MouseEvent e){
			int x = e.getX();
			int y = e.getY();
			currentRect = new Rectangle(x, y, 0, 0);
			 updateDrawableRect(getWidth(), getHeight());
	            repaint();
	        }

	        public void mouseDragged(MouseEvent e) {
	            updateSize(e);
	        }

	        public void mouseReleased(MouseEvent e) {
	            updateSize(e);
	        }

	        void updateSize(MouseEvent e) {
	            int x = e.getX();
	            int y = e.getY();
	            currentRect.setSize(x - currentRect.x,
	                                y - currentRect.y);
	            updateDrawableRect(getWidth(), getHeight());
	            Rectangle totalRepaint = rectToDraw.union(previousRectDrawn);
	            repaint(totalRepaint.x, totalRepaint.y,
	                    totalRepaint.width, totalRepaint.height);
	        }

		
	}
	public void paintComponent(Graphics g) {
        super.paintComponent(g); //paints the background and image

      
        if (currentRect != null) {
            //Draw a rectangle on top of the image.
            g.setXORMode(Color.white); //Color of line varies
                                       //depending on image colors
            g.drawRect(rectToDraw.x, rectToDraw.y, 
                       rectToDraw.width - 1, rectToDraw.height - 1);

            //panel.updateLabel(rectToDraw);
        }
    }

    void updateDrawableRect(int compWidth, int compHeight) {
        int x = currentRect.x;
        int y = currentRect.y;
        int width = currentRect.width;
        int height = currentRect.height;

        //Make the width and height positive, if necessary.
        if (width < 0) {
            width = 0 - width;
            x = x - width + 1; 
            if (x < 0) {
                width += x; 
                x = 0;
            }
        }
        if (height < 0) {
            height = 0 - height;
            y = y - height + 1; 
            if (y < 0) {
                height += y; 
                y = 0;
            }
        }

        //The rectangle shouldn't extend past the drawing area.
        if ((x + width) > compWidth) {
            width = compWidth - x;
        }
        if ((y + height) > compHeight) {
            height = compHeight - y;
        }
      
        //Update rectToDraw after saving old value.
        if (rectToDraw != null) {
            previousRectDrawn.setBounds(
                        rectToDraw.x, rectToDraw.y, 
                        rectToDraw.width, rectToDraw.height);
            rectToDraw.setBounds(x, y, width, height);
        } else {
            rectToDraw = new Rectangle(x, y, width, height);
        }
    }
}
public class Test {
	public static void main(String args[]){
		init();	
	}
	public static void init() {
                            JFrame frame = new JFrame();
                            frame.setSize(700, 700);
		frame.setResizable(false);
//Julia extends JPanel and draws some image in itself
                            final Julia panel = new Julia();
                            BufferedImage buffy = new BufferedImage(panel.getWidth(),
							panel.getHeight(), BufferedImage.TYPE_INT_RGB);
                            ImageIcon icon = new ImageIcon( buffy );
		LabelDemo l = new LabelDemo(panel, icon); 
                            frame.add(panel);
                            frame.setVisible(true);
                            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}
}    
                             

[Darryl Burke]

Your question can't possibly be answered without knowing what Julia does to JPanel. That said, it looks like you're trying to mesh code from the net with your own (or maybe another disparate code from the net). Those codes are for drawing a selection rectangle on a JLabel that shows an ImageIcon.

Oh, and you should always respect the directives of a copyright owner, even if you change a few things.
http://docs.oracle.com/javase/tutorial/uiswing/examples/painting/SelectionDemoProject/src/painting/SelectionDemo.java

Older Sun copyright notice here and on many other sites:
http://www.java2s.com/Code/Java/Event/Dragswithintheimage.htm