Re: saving grid to a jpeg file format

• To: karan kapoor <visad_guy@xxxxxxxxx>
• Subject: Re: saving grid to a jpeg file format
• From: Bill Hibbard <hibbard@xxxxxxxxxxxxxxxxx>
• Date: Tue, 04 Sep 2001 05:15:55 -0500

Hi Karan,

> I have a grid created and i want to save it to the
> file which is of either *.gif or *.jpeg format and
> then open it when required.
> 
> I have created a grid on canvas which is  added to the
> JDialog. I want to save it either in *.gif or *.jpeg
> format. I tried to do something like this.
> 
> public void convertGridToImage() {
>     BufferedImage image = display.getImage();
>     try {
>         JPEGEncodeParam param
> JPEGCodec.getDefaultJPEGEncodeParam(image);
>             param.setQuality(1.0f, true);
>             FileOutputStream fout = new
> FileOutputStream("c:/newtry.gif");
>             JPEGImageEncoder encoder
> JPEGCodec.createJPEGEncoder(fout);
>             encoder.encode(image, param);
>             fout.close();
>         }
>         catch (NoClassDefFoundError err) {
>             throw new VisADException("JPEG codec not
> found");
>         }
> 
>     }
> 
> it gives the exception at this place
> display.getImage();

What Exception??? Is it "VisADError: cannot call getImage() from Thread: ..."?
Always be as specific as possible.

> I checked the captureImage() method in BasicSSCell
> class, but these examples are too complicated for a
> person who is still learning VisAD.

Its not so hard. If you are calling getImage() from a callback,
you need to put it in its own thread, as seen in the
FancySSCell.captureDialog() method.

Good luck,
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:
  • saving grid to a jpeg file format
    • From: karan kapoor