Matplotlib.axis.Axis.add_callback() in Python

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Matplotlib is a library in Python and it is numerical – mathematical extension for NumPy library. It is an amazing visualization library in Python for 2D plots of arrays and used for working with the broader SciPy stack.

Matplotlib.axis.Axis.add_callback() Function

The Axis.add_callback() function in axis module of matplotlib library is used to add a callback function that will be called whenever one of the Artist’s properties changes.

Syntax: Artist.add_callback(self, func)

Parameters: This method accepts the following parameters.

func: This parameter is the callback function.

Return value: This method returns the observer id associated with the callback.

Below examples illustrate the matplotlib.axis.Axis.add_callback() function in matplotlib.axis:

Example 1:

Python3

# Implementation of matplotlib function 
from matplotlib.axis import Axis 
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 = 200)  
    timer.add_callback(update)  
    timer.start()  
    
fig, ax = plt.subplots()  
start_animation()  
          
ax.set_title('matplotlib.axis.Axis.add_callback() \ 
function Example', fontweight ="bold")   
    
plt.show()  

Output:

Example 2:

Python3

# Implementation of matplotlib function 
from matplotlib.axis import Axis 
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.axis.Axis.add_callback() \ 
function Example', fontweight ="bold")   
    
plt.show()  

Output:

Draw at time : 1591263025.354224
Draw at time : 1591263025.4612164
Draw at time : 1591263025.6232233
Draw at time : 1591263025.748225
Draw at time : 1591263025.8842134
...... so on...