Matplotlib.axes.Axes.get_alpha() in Python
Last Updated :
30 Apr, 2020
Matplotlib is a library in Python and it is numerical – mathematical extension for NumPy library. The Axes Class contains most of the figure elements: Axis, Tick, Line2D, Text, Polygon, etc., and sets the coordinate system. And the instances of Axes supports callbacks through a callbacks attribute.
matplotlib.axes.Axes.get_alpha() Function
The Axes.get_alpha() function in axes module of matplotlib library is used to get the alpha value used for blending.
Syntax: Axes.get_alpha(self)
Parameters: This method does not accepts any parameter.
Returns: This method return the alpha value used for blending.
Below examples illustrate the matplotlib.axes.Axes.get_alpha() function in matplotlib.axes:
Example 1:
import matplotlib
import numpy as np
import matplotlib.pyplot as plt
np.random.seed( 10 * * 7 )
mu = 121
sigma = 21
x = mu + sigma * np.random.randn( 1000 )
num_bins = 100
fig, ax = plt.subplots()
n, bins, patches = ax.hist(x, num_bins,
density = 1 ,
color = 'green' ,
alpha = 0.7 )
y = (( 1 / (np.sqrt( 2 * np.pi) * sigma)) *
np.exp( - 0.5 * ( 1 / sigma * (bins - mu)) * * 2 ))
ax.plot(bins, y, '--' , color = 'black' )
ax.set_xlabel( 'X-Axis' )
ax.set_ylabel( 'Y-Axis' )
w = ax.get_alpha()
ax.set_title( "Alpha Value : " + str (w))
fig.suptitle('matplotlib.axes.Axes.get_alpha() function \
Example', fontweight = "bold" )
plt.show()
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Output:
Example 2:
import matplotlib.pyplot as plt
import numpy as np
rx, ry = 3. , 1.
value1 = rx * ry * np.pi
value2 = np.arange( 0 , 3 * np.pi + 0.01 , 0.2 )
value3 = np.column_stack([rx / value1 * np.cos(value2),
ry / value1 * np.sin(value2)])
x, y, s, c = np.random.rand( 4 , 99 )
s * = 10 * * 2.
fig, ax = plt.subplots()
ax.scatter(x, y, s, c, marker = value3)
ax.set_alpha( 0.8 )
w = ax.get_alpha()
ax.set_title( "Alpha Value : " + str (w))
fig.suptitle('matplotlib.axes.Axes.get_alpha() \
function Example', fontweight = "bold" )
plt.show()
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Output:
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