Python - update plot based on a timer

Question

I have a list of 2D arrays that I plot them using a slider from matplotlib.
I added some control buttons to my plot, so I want to click a play button, and the plot changes with some time interval.
Here's the function that is called by the button:

def play(mouse_event):    
    for x in range(len(listOfMoments)):
        image.set_data(listOfMoments[x]) 
        time.sleep(0.5)
        print(x)

The print(x) shows that x is increasing normally, however, it plots only the last array of the list, after the increment finishes. My question is: How can I make it plot the array one by one, as it expected to be?

I should mention also that I tried the while loop and got the same results.

Bennett Brown · Accepted Answer · 2017-08-02 04:33:48Z

2

You need to tell the backend to update the figure after changing the data each time through the loop:

fig.canvas.draw()

Here's the documentation reference.

If you don't have a reference to the Figure object, you can probably retrieve it with fig = plt.gcf().

answered Aug 2, 2017 at 4:33

Bennett Brown

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2 Comments

philippos Over a year ago

That what was missing. I just added fig.canvas.draw() and it worked. Thanks a lot!

Bennett Brown Over a year ago

You might also use a timer with a callback instead of sleep so that you retain interactivity during the delay. See matplotlib.org/examples/event_handling/timers.html

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