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pythonmatplotlibpie-chart
Eric O. Lebigot
Eric O. Lebigot

Reputation: 94565

How to plot a pie chart with the first wedge on top, in Python? [matplotlib]

How can a pie chart be drawn with Matplotlib with a first wedge that starts at noon (i.e. on the top of the pie)? The default is for pyplot.pie() to place the first edge at three o'clock, and it would be great to be able to customize this.

Upvotes: 4

Views: 4399

Answers (2)

Nils Gudat
Nils Gudat

Reputation: 13800

Just because this came up in a Google search for me, I'll add that in the meantime, matplotlib has included just this as an additional argument to the pie function.

Now, one can call plt.pie(data, startangle=90) to have the first wedge start at noon.

PyPlot documentation on this

Upvotes: 6

Joe Kington
Joe Kington

Reputation: 284750

It's a bit of a hack, but you can do something like this...

import matplotlib.pyplot as plt
from matplotlib.transforms import Affine2D
import numpy as np

x = [5, 20, 10, 10]
labels=['cliffs', 'frogs', 'stumps', 'old men on tractors']

plt.figure()
plt.suptitle("Things I narrowly missed while learning to drive")
wedges, labels = plt.pie(x, labels=labels)
plt.axis('equal')

starting_angle = 90
rotation = Affine2D().rotate(np.radians(starting_angle))

for wedge, label in zip(wedges, labels):
    label.set_position(rotation.transform(label.get_position()))
    if label._x > 0:
        label.set_horizontalalignment('left')
    else:
        label.set_horizontalalignment('right')

    wedge._path = wedge._path.transformed(rotation)

plt.show()

Example Pie Plot

Upvotes: 6

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