如何使用setVisible（false）从JFrame创建图像？

Question

I created a JFrame which basically creates a grid with some calculation, and I needed to get an image from that and I am currently using:

public static BufferedImage createImageFromFrame(Component component) {
    int w = component.getWidth();
    int h = component.getHeight();
    BufferedImage image = new BufferedImage(w,h,BufferedImage.TYPE_INT_RGB);
    component.paint( image.getGraphics() );
    return image;
}

calling like:

JFrame window = new JFrame();
// set stuff
BufferedImage img = d.createImageFromFrame(window.getContentPane());

And that do just fine. But now I want to create multiples images from different Frames, and I don't want to each one appear on the screen, I just want the images generated from them. But I noticed I cannot use setVisible(false) cause it gives a java.lang.IllegalArgumentException: Width (0) and height (0) cannot be <= 0 .

Is there any work around, or something to change that may help me accomplished that?

Answer 1

Pack the frame and move it outside of the visible area of your display. For example:

frame.pack();
frame.setLocation(-2000, -2000);
frame.setVisible(true);
// There you go, the frame won't be visible