Python中的 Matplotlib.axis.Axis.add_callback()

Matplotlib是Python中的一个库，它是 NumPy 库的数值数学扩展。它是Python中用于二维数组图的惊人可视化库，用于处理更广泛的 SciPy 堆栈。

Matplotlib.axis.Axis.add_callback()函数

matplotlib 库的轴模块中的Axis.add_callback()函数用于添加一个回调函数，该回调函数将在 Artist 的属性之一发生更改时调用。

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. 

下面的示例说明了 matplotlib.axis 中的 matplotlib.axis.Axis.add_callback()函数：

示例 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()

输出：

示例 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() 

输出：

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...