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Matplotlib.axis.Axis.add_callback() in Python

  • Last Updated : 05 Jun, 2020
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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...

 

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