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Matplotlib.axes.Axes.add_callback() in Python

  • Last Updated : 10 May, 2020

Matplotlib is a library in Python and it is numerical – mathematical extension for NumPy library. The Axes Class contains most of the figure elements: Axis, Tick, Line2D, Text, Polygon, etc., and sets the coordinate system. And the instances of Axes supports callbacks through a callbacks attribute.

matplotlib.axes.Axes.add_callback() method

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The add_callback() method in axes module of matplotlib library is used to get whether to redraw after every plotting command.

Syntax: Axes.add_callback(self, func)



Parameters: This method accepts the following parameters.

  • func : This parameter is the callback function

Returns: This method returns the observer id associated with the callback.

Below examples illustrate the matplotlib.axes.Axes.add_callback() function in matplotlib:

Example 1:




# Implementation of matplotlib function
import matplotlib.pyplot as plt
import numpy as np
import time
  
  
def update():
    plt.get_current_fig_manager().canvas.figure.patch.set_facecolor(str(np.random.random()))
    plt.draw()
    print("Draw at time :", time.time())
      
  
def start_animation():
      
    timer = fig.canvas.new_timer(interval = 50)
    timer.add_callback(update)
    timer.start()
  
fig, ax = plt.subplots()
start_animation()
        
ax.set_title('matplotlib.axes.Axes.add_callback() function\
 Example', fontweight ="bold"
  
plt.show()

Output:

python-matplotlib-add-callback1

Example 2:




# Implementation of matplotlib function  
from random import randint, choice 
import time 
import matplotlib.pyplot as plt 
import matplotlib.patches as mpatches 
    
    
back_color = "black"
colors = ['red', 'green', 'blue', 'purple'
width, height = 4, 4
    
fig, ax = plt.subplots() 
ax.set(xlim =[0, width], ylim =[0, height]) 
    
fig.canvas.draw() 
    
def update(): 
    x = randint(0, width - 1
    y = randint(0, height - 1
    
    arti = mpatches.Rectangle( 
        (x, y), 1, 1
        facecolor = choice(colors), 
        edgecolor = back_color 
    
    ax.add_artist(arti)
      
    ax.draw_artist(arti) 
    fig.canvas.blit(ax.bbox) 
    print("Draw at time :", time.time()) 
    
timer = fig.canvas.new_timer(interval = 1
timer.add_callback(update) 
timer.start() 
  
        
ax.set_title('matplotlib.axes.Axes.add_callback() \
function Example', fontweight ="bold"
  
plt.show()

Output:




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