Matplotlib.axes.axes.add_callback()

Matplotlib是Python中的一个库，它是NumPy库的数值-数学扩展。Axes包含了大多数图形元素:Axis、Tick、Line2D、Text、Polygon等，并设置坐标系。Axes的实例通过callbacks属性支持回调。

matplotlib.axes.axes.add_callback()方法

matplotlib库的axes模块中的add_callback()方法用于获取每个绘图命令后是否重绘。

语法:Axes.add_callback(self, func)

参数:该方法接受以下参数。

func:回调函数

该方法返回与回调关联的观察者id。

下面的例子演示了matplotlib中的matplotlib.axes.axes.add_callback()函数:

示例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()

输出:

Matplotlib.axes.axes.add_callback()

示例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()