I've created an Overview with these settings:

setTrackingRectPen(new Pen(4, Color.RED));

I expect the rectangle to have the same size all the time, but it seems to resize itself with the diagram. When the diagram is small, the rectangle is thick. When the diagram is large, the triangle is thin.

This doesn't happen when I zoom in or zoom out. Only when I load different diagrams.

Thanks,
Yoav

It doesn't happen in Fit All - but I do change zoom factor in diagram.
I think the rectangle should always have a fixed size - this is how other applications seems to behave (since the rectangle is not part of the graph but part of the Overview widget).
Thanks,
Yoav

Thanks - it seems to be solving many issues.
The rectangle is now smoother.
An odd thing happens - it seems that the rectangle sometimes exits the Overview - suddenly the edge vanishes. It seems that this happens only to the left edge.
Do you know what may be the reason?

I''l add to the previous question:
May this be a parameter that I provide? Can a user be causing the rectangle to exceed the overview (by changing bounds or stuff like that)?
Thanks,
Yoav

It could still be a problem, since 1 point is larger than a pixel. You might try setting the width to 0 - in that case JDiagram should always make the line exactly 1 pixel wide, though I am not sure if it won't be lost again because of some rounding errors. If that doesn't help, we could draw a rectangle that's a pen.Width / 2 smaller that the original, to make sure the lines are drawn entirely inside the tracking rectangle independently of their size.

Stoyan