Re: AnimationControl

• To: Doug Lindholm <lind@xxxxxxxx>
• Subject: Re: AnimationControl
• From: Bill Hibbard <hibbard@xxxxxxxxxxxxxxxxx>
• Date: Thu, 20 Dec 2001 09:08:04 -0600

Hi Doug,

> Thanks for the info, Bill. I'm afraid the current behavior is a show
> stopper. I poked around in the code to see if I could override
> something, but the changes went a bit too deep for my comfort. Any
> suggestions?
> 
> Bottom line: I need to be able to set the current time (by value
> preferably) and see my data for the nearest time samples <= the current
> time. (kind of like the Price is Right :-)
> 
> That also means that if I setCurrent to the last animation step, for
> example, I should see the latest of all my Fields, no matter how old.
> (see point 3 below) If I setCurrent to something before I have data for
> a particular Field, then I should see nothing for that Field, though I
> may have valid samples for other Fields (e.g. I'm still within the range
> of the AnimationSet.)

You can change this behavior by extending some classes:

1. Extend AnimationControlJ3D and override the selectSwitches()
method of AVControlJ3D (note AnimationControlJ3D and
ValueControlJ3D extend AVControlJ3D, and I just declared
selectSwitches() as public in a release this morning), to
implement the behavior you want. Although there is some complex
logic dealing with Units and CoordinateSystems in
selectSwitches(), you need to focus on the call:

  indices = set.doubleToIndex(values);

near the end of the method. You need to replace it with logic
that probably gets the double[][] array from set and find the
index of the greatest value less than the current value (the
'value' argument to selectSwitches). You also want to change
the conditions for calling:

  ss.swit.setWhichChild(Switch.CHILD_NONE);

2. Extend DefaultDisplayRendererJ3D or TwoDDisplayRendererJ3D
and override the makeControl() method of DisplayRendererJ3D,
to construct and return your extension of AnimationControlJ3D
when the DisplayRealType is Display.Animation. Then use this
DisplayRenderer extension when you construct your DisplayImplJ3D.

If you'd like to declare your new classes in the visad.java3d
package and send them to me, I'd like to add them to the
distribution.

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:
  • AnimationControl
    • From: Doug Lindholm
  • Re: AnimationControl
    • From: Bill Hibbard
  • Re: AnimationControl
    • From: Doug Lindholm