Python 中的 matplotlib . axis . axis . add _ callback()
原文:https://www . geesforgeks . org/matplotlib-axis-axis-add _ callback-in-python/
Matplotlib 是 Python 中的一个库，是 NumPy 库的数值-数学扩展。这是一个神奇的 Python 可视化库，用于 2D 数组图，并用于处理更广泛的 SciPy 堆栈。
matplotlib . axis . axis . add _ 回调()函数
matplotlib 库的 Axis 模块中的 Axis.add_callback()函数用于添加一个回调函数，每当 Artist 的某个属性发生变化时都会调用该函数。
语法: Artist.add_callback(self，func)
参数:该方法接受以下参数。
- 功能:该参数为回调函数。
返回值:该方法返回与回调相关联的观察者 id。
下面的例子说明了 matplotlib . axis . axis . add _ callback()函数在 matplotlib.axis:
例 1:
Python 3
# 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:
例 2:
Python 3
# 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:
[https://media.geeksforgeeks.org/wp-content/cdn-uploads/20200605212619/python-matplotlib-on-callback-axis.webm](https://media.geeksforgeeks.org/wp-content/cdn-uploads/20200605212619/python-matplotlib-on-callback-axis.webm)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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