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I saw that matplotlib's pyplot.scatter() has an 'alpha' parameter that can be used to set the transparency of points. The pyplot.pie() doesn't have a similar parameter however. How can I set the transparency of certain wedges?
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To avoid overlapping of labels and autopct in a matplotlib pie chart, we can follow label as a legend, using legend() method.
labels is a list of sequence of strings which sets the label of each wedge. color attribute is used to provide color to the wedges. autopct is a string used to label the wedge with their numerical value. shadow is used to create shadow of wedge.
explode : array-like, optional, default: None. If not None, is a len(x) array which specifies the fraction of the radius with which to offset each wedge. labels : list, optional, default: None. A sequence of strings providing the labels for each wedge.
In order to change the background color, you should create a figure with figure() function and set the color with patch. set_facecolor() before creating your pie plot.
I found the answer while writing up this question and figured I'd post the solution for anyone who wants to know.
To set a wedge to be transparent:
import matplotlib.pyplot as plt
x = [1,2,3,0.4,5]
alpha = 0.5
which_wedge = 4
n = plt.pie(x)
n[0][which_wedge].set_alpha(alpha)
If you want to only display a single wedge, use a loop:
for i in range(len(n[0])):
n[0][i].set_alpha(0.0)
n[0][which_wedge].set_alpha(1.0)
Hope this helps someone! It can probably be used for pyplot.bar() too to hide certain bars.
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