Jpanel, jframe & jscrollpane related problems

[ludaekipa]

Hi

This is my code:

Grafi smart1 = new Grafi(nn, testing, n_archi, max*160+60);
int width1 = 0;
int height1 = 0;
width1=max*160+60;
if (ncompat==1) {
height1=(int)((nn*30))+60;
} else {
height1=(int)((nn*30)/(ncompat-1))+60;
}
smart1.setPreferredSize(new Dimension(width1, height1));
JScrollPane scrollpane1 = new JScrollPane(smart1);
JFrame f1 = new JFrame("MyFindeR - Direct Strand");
f1.setContentPane(scrollpane1);
f1.setSize(800, 600);
f1.setVisible(true);

Grafi is a class which extends JPanel, and smart1 is an instance of Grafi on
which there are drawed some ractangles and lines. My smart1 is very huge
and everytime I use repaint(), it takes 7-8 seconds to repaint it all. So,
I would like to use the repaint(x,y,width,height) feature, and repaint only
the visible part of smart1. In that case width and height would be 800 and
600 (frame size), but, how can I find x & y? I need x and y of smart1, that
corresponds to the point (0,0) of the frame. Is there a way to find them?
Thnx

 

[Luca Paganelli]

See
JScrollPane.getViewport().getViewPosition();

 

[ludaekipa]

See
JScrollPane.getViewport().getViewPosition();

It works. thnx.