Matplotlib is a library in Python and it is numerical – mathematical extension for NumPy library. The Artist class contains Abstract base class for objects that render into a FigureCanvas. All visible elements in a figure are subclasses of Artist.
matplotlib.artist.Artist.add_callback() method
The add_callback() method in artist 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.
Returns: This method returns the observer id associated with the callback.
Below examples illustrate the matplotlib.artist.Artist.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 = plt.figure() start_animation() fig.suptitle('matplotlib.artist.Artist.add_callback() \ function Example', fontweight ="bold") plt.show() |
Output:
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 = plt.figure() plt.xlim([0, width]) plt.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 ) fig.add_artist(arti) fig.draw_artist(arti) fig.canvas.blit(fig.bbox) print("Draw at time :", time.time()) timer = fig.canvas.new_timer(interval = 1) timer.add_callback(update) timer.start() fig.suptitle('matplotlib.artist.Artist.add_callback() \ function Example', fontweight ="bold") plt.show() |
Output:
