CODEWITHSUNDEEP
javaimage
Oliver Goossens
Oliver Goossens

Reputation: 1913

Strange behavior of JAVA : getSubimage() function

Hello there,

I am running the following code to make a screenshot of my JPanel.

private void makePanelImage(Component panel, String saveAs) {
    Dimension size = panel.getSize();
    BufferedImage image = new BufferedImage(size.width, size.height, BufferedImage.TYPE_INT_RGB);

    // CROP
     // BufferedImage cropped = image.getSubimage(9, 31, 2459, 3467);
     BufferedImage cropped = image.getSubimage(1800, 2000, 500, 700);

    Graphics2D g2 = cropped.createGraphics();
    panel.paint(g2);
    saveAs = saveAs + ".png";
    try {
        ImageIO.write(cropped, "png", new File(saveAs));
        System.out.println("Image Saved: " + saveAs);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

The problematic part is:

BufferedImage cropped = image.getSubimage(1800, 2000, 500, 700);

No matter what I set X and Y to - it ALWAYS is taken as ignored. As it would be 0 and 0. And I have no idea why? Has anyone encountered this before? The second part - width and height do have effect on the image, I can make it smaller as much as I want - which is nice. But the top left "beginning" of the raster WONT move.

Is this a bug?

Note: What is funny though, the moment I set it to OFFSET + WIDTH > ORIGINAL I get an error - which is logical but still It wont get "moved"

Am I missing here something please?

Upvotes: 0

Views: 348

Answers (1)

gpasch
gpasch

Reputation: 2682

You can try this

BufferedImage image = new BufferedImage(panel.getWidth(), panel.getHeight(), BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = image.createGraphics();
panel.paint(g2);
BufferedImage cropped = image.getSubimage(1800, 2000, 500, 700);

Upvotes: 1

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