matplotlib-users

[Matplotlib-users] Updating quiver arrows in animation

[reckoner <rec...@gm...>]

Hi,

I have a plot that includes arrows drawn by the quiver command. I would 
like to create animation using Func Animation, but I don't know how to 
update the quiver arrows. I can update everything else on the plot and 
animates fine.

Does anybody know how to update the quiver arrows in an animation? I 
know the quiver arrows have a XY property, but changing that doesn't 
update the plot.

Thanks!

Re: [Matplotlib-users] Updating quiver arrows in animation

[Eric F. <ef...@ha...>]

On 2012/09/22 3:03 AM, reckoner wrote:
> Hi,
>
> I have a plot that includes arrows drawn by the quiver command. I would
> like to create animation using Func Animation, but I don't know how to
> update the quiver arrows. I can update everything else on the plot and
> animates fine.
>
> Does anybody know how to update the quiver arrows in an animation? I
> know the quiver arrows have a XY property, but changing that doesn't
> update the plot.

You cannot update the arrow positions without making a new Quiver 
instance, so to animate with varying positions, you will need to delete 
the previous Quiver instance and make a new one for each frame.

Eric

>
> Thanks!

Re: [Matplotlib-users] Updating quiver arrows in animation

[Ryan M. <rm...@gm...>]

On Sat, Sep 22, 2012 at 12:40 PM, Eric Firing <ef...@ha...> wrote:
> On 2012/09/22 3:03 AM, reckoner wrote:
>> Hi,
>>
>> I have a plot that includes arrows drawn by the quiver command. I would
>> like to create animation using Func Animation, but I don't know how to
>> update the quiver arrows. I can update everything else on the plot and
>> animates fine.
>>
>> Does anybody know how to update the quiver arrows in an animation? I
>> know the quiver arrows have a XY property, but changing that doesn't
>> update the plot.
>
> You cannot update the arrow positions without making a new Quiver
> instance, so to animate with varying positions, you will need to delete
> the previous Quiver instance and make a new one for each frame.

Given this, it might be best to use ArtistAnimation then, which should
handle turning on and off artists that you provide as a list of list
of artists.

Ryan

-- 
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma