// initialize default image
private BufferedImage getDefaultImage(int w, int h) {
BufferedImage defaultImage = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
Graphics2D graphics2D = defaultImage.createGraphics();
graphics2D.setColor(new Color(200, 200, 200));
graphics2D.fillRect(0, 0, w, h);
graphics2D.setColor(new Color(130, 130, 130));
graphics2D.drawRect(0, 0, w - 1, h - 1);
return defaultImage;
}
private void drawRectangle(int x, int y, int width, int height) {
gRef.drawRect(x, y, width, height);
}