如何在JLabel上绘图？

Question

I want to use the 2D Java API to draw on a JLabel that already has an image on it and then save the resulting edited picture.

I can't find any tutorials on this specific subject, does anyone have any code or references that show how to do it?

Answer 1

override the paintComponent method of the JLabel . It should first call super.paintComponent , so you get whatever the JLabel contains, then add your own drawing code after that. Should look somewhat like this:

public void paintComponent(Graphics g){
    super.paintComponent(g)
    g.drawWhatever ...
}

Answer 2

One approach would be to render the existing image and drawing into a BufferedImage , as shown in this example that overlays text on a logo. Once the image is complete, use ImageIO.write() to save it in the desired format.