Thread: adding rectangles in images

hey guys, I'm new to Java, and I need to highlight a part of an image with a rectangle, but I don't know if it is possible to modify a jpg picture this way. I found out on the internet that I could add a rectangle to an image and store it something called TexturePaint. I tried to put it on my JPanel, but it didn't compile. Anyone knows a simple way to display a TexturePaint or even better, how to add a simple rectangle in an image??


Rectangle Rect = new Rectangle(60, 70, image.getWidth(), image.getHeight());
TexturePaint TextureAux = new TexturePaint(image, Rect);

JPanel panel = new JPanel ();
panel.add(new JLabel(new ImageIcon(image)));
panel.add(new JLabel(new TexturePaintIcon(TextureAux))); //---> THIS DOESN'T COMPILE!
JFrame frame = new JFrame ("Images");
frame.getContentPane().add(panel);
frame.pack();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOS E);

how to add a simple rectangle in an image

If you mean to display the image with a rectangle on it,
In a paintComponent method, draw the image first and then draw the rectangle

Don't you know where I can find a simple tutorial for paintComponent?

I ended up modifying the pixels of my images by using 2 fors. Well, I know it's not the best solution, but it worked as well.

// x and y are the top left corners of the rectangle
// Xsize and Ysize are respectively, the width and the height of the rectangle
// ImageDest is the image where I'm adding the blue rectangles

for (int xi=x; xi<(x+Xsize); xi++) {
ImageDest.setRGB(xi, y, 255);
ImageDest.setRGB(xi, y+Ysize, 255);
}
for (int yi=y; yi<(y+Ysize); yi++) {
ImageDest.setRGB(x, yi, 255);
ImageDest.setRGB(x+Xsize, yi, 255);
}

There are a lot of code samples on the forum that use the paintComponent method. Try doing a Search here.