RE: regarding 2d image and boundary

• To: "Bill Hibbard" <billh@xxxxxxxxxxxxx> "Tom Whittaker" <tomw@xxxxxxxxxxxxx>
• Subject: RE: regarding 2d image and boundary
• From: "Mantri, Mr. Ramesh" <mantri.csc.in@xxxxxxxxxxxxxxx>
• Date: Tue, 30 Sep 2003 14:39:04 -0700

Bill (and Tom),
   thank you for your reply and help. This mailing-list has been very helpful. 
When
I am filled with so much gratitude, bonhomie, and such feelings as 
this-world-is-overflowing-with-love and all that Jazz, I start thinking of ways 
to
ship some beer to the other end, and then realize it isn't feasible. I'll drink 
to
your health sometime.
   I was able to solve most of my problem. A few minor issues remain that I'll 
be
able to solve. At the end of all this ordeal, I am not too much wiser about 
VisAD,
perhaps just a little. My point is, it might be a good idea for someone to 
write a
book on VisAD, if time permits.
   The example Test57.java was interesting. I commented out the line where the
DisplayListener is added to the display and observed that rotate() is invoked 
only
once. Then I uncommented it, and added a sleep of 500 millis in rotate() method.
So I learnt a couple of things by trial-and-error.
sincerely,
Ramesh

-----Original Message-----
From: Bill Hibbard [mailto:billh@xxxxxxxxxxxxx]
Sent: Tuesday, September 30, 2003 9:03 AM
To: Mantri, Mr. Ramesh
Subject: RE: regarding 2d image and boundary


Hi Ramesh,

>    you are very right. I missed the lower bound in the "color palette". I 
> guess
> I was in a hurry code something using VisAD that was earlier done using GMT. 
> There
> are reasons why this is being done and I know as much about VisAD as I know 
> about
> GMT, which is next to nothing.
>    So I really need help. My question is actually illustrated better 
> following your
> suggested modification. All the contours are filled, but why is there a huge 
> boundary
> surrounding the image. Is there any way the image could occupy the entire 
> space. I was
> told by someone who used Vis5D a long time ago, that there was something like 
> a
> "viewing distance", which if reduced to zero (or something similar) would 
> cause the
> image to occupy the entire space available. I would like to know if there is 
> something
> to that effect. I searched the API documentation, but couldn't find anything.

To do this, you need something like the rotate() method in
visad/examples/Test57.java, except you want to zoom instead
of rotate and you only want to do this once rather than
repeatedly. The 4th argument to make_matrix() is the zoom
factor. You'll need to experiment with values other than
1.0 for zoom, but use 0.0 for all other arguments.

Good luck,
Bill