programmatic control of Jupyter interactive

[Randy Heiland]

Hello,

I'm doing the equivalent of this:

        self.i_plot = interactive(self.plot_file, frame=(0, num_files), continuous_update=False)  

   

    def plot_file(self, file_num):

       ...

and would like to have a "Play" button be able to programmatically step through all files. However, I can't directly call 'plot_file(fnum)' as it plots multiple (matplotlib) frames, rather than use the same frame. Any suggestions?

thanks, Randy

[Randy Heiland]

In case anyone's interested, here's a simple example:

%matplotlib inline

import matplotlib.pyplot as plt

import random

import numpy as np

from ipywidgets import interactive, ToggleButton, HBox

redraw_fig = True

def update_plot(p):

    global redraw_fig

    if (redraw_fig):

        plt.figure(1)

    nx = 20

    ny = 10

    x = np.linspace(1, nx, nx)

    y = np.linspace(1, ny, ny)

    xv, yv = np.meshgrid(x, y)

    rgb = np.zeros((nx*ny,3))

    rgb[:,0] += 1  # default to all red

    for rval in random.sample(range(nx*ny), int(p/100. * (nx*ny))):

        rgb[:][rval] = [0,1,0]

    area=200

    plt.scatter(xv, yv, marker='s', s=area, c=rgb)

    plt.axis('off')

    plt.xticks([])

    plt.yticks([])

#     plt.show()

def play_cb(b):

    global redraw_fig

    redraw_fig = False

    for idx in range(0,100,20):

        print('>>> ',idx)

        update_plot(idx)

                

plot = interactive(update_plot, p=(0, 100), continuous_update=False)

output = plot.children[-1]

output.layout.height = '300px'

play_btn = ToggleButton( description='Play' )

play_btn.observe(play_cb)

gui = HBox([plot,play_btn])

gui