Re: thanks, slider example

• To: visad-list@xxxxxxxxxxxxx
• Subject: Re: thanks, slider example
• From: "William L. Hibbard" <WHIBBARD@xxxxxxxxxxxxx>
• Date: Fri, 26 Mar 1999 17:20 CST

Hi Doug,
 
> OK, I do actually have a couple of questions:
> 1) Why won't the shape appear till after clicking on the slider? (It
> worked for me before I "cleaned up" my code. I see the same problem in
> some Test programs.)
 
Congratulations, and thank you.  You have uncovered a bug.  I know the
fix, but am very busy next week so the fix won't show up on our ftp
for a while (we run a lot of tests before updating the ftp site).
 
In the meantime, you can hack Plot2D to work by moving
'vc.setValue(50.0);' after 'display.addReference(ref2, null);' and
inserting another statement as follows:
 
    display.addReference(ref2, null);
    DisplayImpl.delay(1000);
    vc.setValue(50.0);
 
> 2) Is there a convenient way to center the text shape thingy?
> ("center=true" seems to apply only to the horizontal)
 
"center" is more necessary in the horizontal because of the difficulty
of estimating the width of a string.  In the vertical, you could just
subtract 0.5*up from start (it might not be exactly 0.5) to center.
 
> 3) Is my code a bunch of crap or am I catching on to this thing? Any
> comments welcome.
 
Looks like you've got a pretty good grasp of VisAD.
 
One small thing: the FlatField range elements of your FieldImpl
time_sequence all have domain Sets with one element.  So those
FlatField range elements could instead be RealTuples and and
time_sequence could be a FlatField rather than a FieldImpl (unless
you are planning to change time_sequence so that its FlatField
range elements have domain Sets with more than one element).
 
That is, time_sequence has the MathType:
 
  (Time -> ((x, y) -> shape))
 
and this could be changed to:
 
  (Time -> (x, y, shape))
 
in which case time_sequence could be a FlatField.
 
I am anxious to see how your application develops - please keep me
posted.
 
Cheers,
Bill
 
----------------------------------------------------------
Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI  53706
whibbard@xxxxxxxxxxxxx  608-263-4427  fax: 608-263-6738
http://www.ssec.wisc.edu/~billh/vis.html