java - How to create an image from a JFrame with setVisible(false)? -


i created jframe creates grid calculation, , needed image , 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 fine. want create multiples images different frames, , don't want each 1 appear on screen, want images generated them. noticed cannot use setvisible(false) cause gives java.lang.illegalargumentexception: width (0) , height (0) cannot <= 0.

is there work around, or change may me accomplished that?

pack frame , move outside of visible area of display. example:

frame.pack(); frame.setlocation(-2000, -2000); frame.setvisible(true); // there go, frame won't visible

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