AppletTalk.com

Dean Ware · Guest

Hi, I'm building a simple image maniplulation program.

I am putting an ImageCanvas object inside a Scrollpane. An imageCanvas
is just an "extended" canvas. I then put this scrolpane inside a
Jtabbedpane.

Thing is, I am doing things with the image but the changes are not
updated immediately. They only take effect after I either switch tabs or
minimise/maximise the window.

This leads me to believe it is a painting/updating problem.

I am a newbie, and this is my first Java GUI.

Below is where I am trying to get the image to update(setMagnification
is where the image gets resized):

public void mousePressed(MouseEvent e) {
myImageCanvas1.setMagnification(2);

myImageCanvas1.update(myImageCanvas1.getGraphics());
myscrollpane1.update(myscrollpane1.getGraphics());
myImagePanel.updateUI();

myImageCanvas1.validate();
myscrollpane1.validate();
myImagePanel.validate();

myImageCanvas1.invalidate();
myscrollpane1.invalidate();
myImagePanel.invalidate();

myImageCanvas1.repaint();
myscrollpane1.repaint();
myImagePanel.repaint();
parent.update(parent.getGraphics());

}

This is just the latest version of the code. I have tried paint() and
repaint() plus invalidate() for ALL objects.

You will notice the "parent" object. This I added as desperation. I
passed parent (which is the Jtabbedpane inside a frame) to the
"ImageCanvas" object in the thought that perhaps the parent needded to
be repainted too.

DIDN'T WORK.

As I say, closing and reopening the window make everything resize and work.

I am obviously missing something here. Looked on google but found nothing.

ANY ideas??

Thanks

"a frustrated" Choca.

Christophe Vanfleteren · Guest

Dean Ware wrote: