[Matplotlib-users] Callback mechanism for animation completed?

Thomas Caswell tcaswell at gmail.com
Fri Apr 20 13:49:19 EDT 2018


Sorry for the very late response!

I would suggest passing in a function as a custom argument which takes the
frame number and returns your parameter.

For example (modified from the docs)

import numpy as np
import matplotlib.pyplot as plt
from matplotlib.animation import FuncAnimation

decades = 5

fig, ax = plt.subplots()
xdata, ydata = [], []
ln, = plt.plot([], [], 'ro', animated=True)
ax.set_xlim(1, 10**decades)
ax.set_ylim(1, (10.0**(decades*(decades - 1))))

def init():
    return ln,

def update(frame, exp_func):
    ydata.append(frame ** exp_func(frame))
    ln.set_data(xdata, ydata)
    return ln,

ani = FuncAnimation(fig, update, frames=np.logspace(0, decades),
                    init_func=init, blit=True,
                    fargs=(lambda frame: int(np.log10(frame)),))


On Tue, Jan 9, 2018 at 11:50 AM Paul Deitel <paul.deitel at deitel.com> wrote:

> Hi Tom,
> Thanks for your response.
> Same figure/artists.
> Basically, for the function called by FuncAnimation, I’d like one of my
> custom arguments to change after some number of frames. I did not find a
> good way to do that, so I was thinking I could have one animation that does
> the first set of frames with the initial custom argument value, followed by
> another animation that does the remaining frames with a different custom
> argument value.
> Thanks,
> Paul
> On Jan 9, 2018, at 8:15 AM, Thomas Caswell <tcaswell at gmail.com> wrote:
> When you say "another animation" do you mean different data on the same
> artists in the same figure, different artists in the same figure or a
> different figure altogether?
> In the first cases I think you could use a generator to sticky tape your
> data together.  In the second two you will have to roll your own.
> Do you need to be able to change the chain while it is running? If so,
> what are you using to get your concurrencey?
> Tom
> On Mon, Jan 8, 2018, 12:38 Paul Deitel <paul.deitel at deitel.com> wrote:
>> I am trying to chain together a series of animations. Is there a callback
>> mechanism of some sort that could be used to launch a new animation when
>> another animation completes?
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