/**
   * Method to display pixel information for the passed x and y
   *
   * @param pictureX the x value in the picture
   * @param pictureY the y value in the picture
   */
  private void displayPixelInformation(int pictureX, int pictureY) {
    // check that this x and y are in range
    if (isLocationInPicture(pictureX, pictureY)) {
      // save the current x and y index
      colIndex = pictureX;
      rowIndex = pictureY;

      // get the pixel at the x and y
      Pixel pixel = new Pixel(picture, colIndex, rowIndex);

      // set the values based on the pixel
      colValue.setText(Integer.toString(colIndex + numberBase));
      rowValue.setText(Integer.toString(rowIndex + numberBase));
      rValue.setText("R: " + pixel.getRed());
      gValue.setText("G: " + pixel.getGreen());
      bValue.setText("B: " + pixel.getBlue());
      colorPanel.setBackground(new Color(pixel.getRed(), pixel.getGreen(), pixel.getBlue()));

    } else {
      clearInformation();
    }

    // notify the image display of the current x and y
    imageDisplay.setCurrentX((int) (colIndex * zoomFactor));
    imageDisplay.setCurrentY((int) (rowIndex * zoomFactor));
  }
  /** Create and initialize the scrolling image */
  private void createAndInitScrollingImage() {
    scrollPane = new JScrollPane();

    BufferedImage bimg = picture.getBufferedImage();
    imageDisplay = new ImageDisplay(bimg);
    imageDisplay.addMouseMotionListener(this);
    imageDisplay.addMouseListener(this);
    imageDisplay.setToolTipText("Click a mouse button on a pixel to see the pixel information");
    scrollPane.setViewportView(imageDisplay);
    pictureFrame.getContentPane().add(scrollPane, BorderLayout.CENTER);
  }
  /**
   * Zooms in the on picture by scaling the image. It is extremely memory intensive.
   *
   * @param factor the amount to zoom by
   */
  public void zoom(double factor) {
    // save the current zoom factor
    zoomFactor = factor;

    // calculate the new width and height and get an image that size
    int width = (int) (picture.getWidth() * zoomFactor);
    int height = (int) (picture.getHeight() * zoomFactor);
    BufferedImage bimg = picture.getBufferedImage();

    // set the scroll image icon to the new image
    imageDisplay.setImage(bimg.getScaledInstance(width, height, Image.SCALE_DEFAULT));
    imageDisplay.setCurrentX((int) (colIndex * zoomFactor));
    imageDisplay.setCurrentY((int) (rowIndex * zoomFactor));
    imageDisplay.revalidate();
    checkScroll(); // check if need to reposition scroll
  }