Animation control

[Dave Allured]

Thank you, Eric.

Since Inquiring Minds Need To Know,  I looked into how xanim.gs does the
time delay.  A shell command is used:

    '!sleep ' sec

where sec is a script variable containing the desired delay in seconds.
You could use either a constant or a variable in this command.

Here's the source location for the whole script.  The time delay is at
the end of the big loop:

   ftp://grads.iges.org/grads/scripts/xanim.gs

--Dave

Eric DeWeaver wrote:

>Hi Binh,
>
>Sometimes I use the pull command, but there's also a script called
>xanim.gs in the grads script library (often found in, say,
>/usr/local/grads/lib/scripts) which animates plots.  You run
>it from withing grads, and you can use -sec and -repeat options
>to add a time delay in seconds and loop through the animation
>several times.  The usage notes are provided in the script file
>itself.
>
>Best Wishes,
>
>Eric
>
>
>
>On Fri, 25 Nov 2005, Dave Allured wrote:
>
>
>
>>Binh,
>>
>>I don't know about an automatic timer in Grads.  If there is not
>>something built in, and you are using a Grads script, then you could
>>certainly use the !shell-command and some external program to introduce
>>a short time delay between frames.
>>
>>For this purpose, I like to have manual control using the keyboard.  Use
>>the pull command to read a dummy string between each frame.  Then you
>>just press the Enter key for each new frame.  You can also check for
>>certain keys such as "f" and "b" to go forward and backward in your
>>animation.
>>
>>http://grads.iges.org/grads/gadoc/script.html#standardio
>>
>>--Dave A.
>>CDC/PSD/NOAA/CIRES
>>
>>Binh Trong Do wrote:
>>
>>
>>
>>>Hi All,
>>>Has anybody know how to control animation speed when using double
>>>buffering?  I would like to have some delay when swaping pictures that
>>>help people have enough time to see what happening on the screen.
>>>Thank you very much
>>>Binh
>>>Postgraduate research student
>>>Department of Earth and Ocean Sciences
>>>Liverpool University, UK
>>>
>>>