Re: 20000313: Saving VisAD displays as JPEGs

• To: John Fracassi <johnfrac@xxxxxxxxx>
• Subject: Re: 20000313: Saving VisAD displays as JPEGs
• From: "From: Bill Hibbard <hibbard@xxxxxxxxxxxxxxxxx>" <billh@xxxxxxxxxxxxx>
• Date: Sun, 5 Nov 2000 19:23:44 -0600 (CST)

Hi John,

> I tried to use getImage() on a display object, but
> that causes the program to block at that point.
> 
> That is:
> <set-up display code>
> display.getImage()
> System.out.println("Done.");
> 
> never displays Done.

I assume you are not seeing a message like:

  visad.VisADError: cannot call getImage() from Thread: AWT-EventQueue-0

which can occur if you call getImage() from an AWT callback.

Your problem can occur if your display is not added to a
Frame on the screen - that is if you are trying to do
offscreen rendering.  Offscreen rendering is currently
not supported for Java3D, but you can do it for Java2D as
described in:

  http://www.unidata.ucar.edu/staff/russ/visad/msg01468.html

Please let us know if this does not solve your problem.

Cheers,
Bill
----------------------------------------------------------
Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI  53706
hibbard@xxxxxxxxxxxxxxxxx  608-263-4427  fax: 608-263-6738
http://www.ssec.wisc.edu/~billh/vis.html

• References:
  • 20000313: Saving VisAD displays as JPEGs
    • From: John Fracassi