Matplotlib.axes.Axes.set_alpha() in Python
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.set_alpha() Function
The Axes.set_alpha() function in axes module of matplotlib library is used to set the alpha value used for blending.
Syntax: Axes.set_alpha(self, alpha)
Parameters: This method accepts only one parameters.
- alpha: This parameter is the contains float value or None.
Returns: This method does not return any value.
Below examples illustrate the matplotlib.axes.Axes.set_alpha() function in matplotlib.axes:
Example 1:
import matplotlib.pyplot as plt
import numpy as np
np.random.seed( 10 * * 7 )
data = [ sorted (np.random.normal( 0 , std, 100 ))
for std in range ( 1 , 5 )]
fig, ax1 = plt.subplots()
val = ax1.violinplot(data)
ax1.set_ylabel( 'Result' )
ax1.set_xlabel( 'Domain Name' )
for i in val[ 'bodies' ]:
i.set_facecolor( 'green' )
i.set_alpha( 0.9 )
fig.suptitle('matplotlib.axes.Axes.set_alpha() \
function Example\n\n', fontweight = "bold" )
plt.show()
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Output:
Example 2:
import matplotlib.pyplot as plt
import numpy as np
from matplotlib.patches import Ellipse
NUM = 200
ells = [Ellipse(xy = np.random.rand( 2 ) * 10 ,
width = np.random.rand(),
height = np.random.rand(),
angle = np.random.rand() * 360 )
for i in range (NUM)]
fig, ax = plt.subplots(subplot_kw = { 'aspect' : 'equal' })
for e in ells:
ax.add_artist(e)
e.set_clip_box(ax.bbox)
e.set_alpha(np.random.rand())
e.set_facecolor(np.random.rand( 4 ))
ax.set_xlim( 3 , 7 )
ax.set_ylim( 3 , 7 )
fig.suptitle('matplotlib.axes.Axes.set_alpha()\
function Example\n\n', fontweight = "bold" )
plt.show()
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Output:
Last Updated :
30 Apr, 2020
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