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Add example of petroff10 in the style sheets to show how to use the color sequence. #28796

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Sep 11, 2024
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Add example of petroff10 in the style sheets to show how to use the color sequence. #28796

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43 changes: 43 additions & 0 deletions galleries/examples/style_sheets/petroff10.py
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"""
=====================
Petroff10 style sheet
=====================

This example demonstrates the "petroff10" style, which implements the 10-color
sequence developed by Matthew A. Petroff [1]_ for accessible data visualization.
The style balances aesthetics with accessibility considerations, making it
suitable for various types of plots while ensuring readability and distinction
between data series.

.. [1] https://arxiv.org/abs/2107.02270

"""

import matplotlib.pyplot as plt
import numpy as np


def colored_lines_example(ax):
t = np.linspace(-10, 10, 100)
nb_colors = len(plt.rcParams['axes.prop_cycle'])
shifts = np.linspace(-5, 5, nb_colors)
amplitudes = np.linspace(1, 1.5, nb_colors)
for t0, a in zip(shifts, amplitudes):
y = a / (1 + np.exp(-(t - t0)))
line, = ax.plot(t, y, '-')
point_indices = np.linspace(0, len(t) - 1, 20, dtype=int)
ax.plot(t[point_indices], y[point_indices], 'o', color=line.get_color())
ax.set_xlim(-10, 10)


def image_and_patch_example(ax):
ax.imshow(np.random.random(size=(20, 20)), interpolation='none')
c = plt.Circle((5, 5), radius=5, label='patch')
ax.add_patch(c)

plt.style.use('petroff10')
fig, (ax1, ax2) = plt.subplots(ncols=2, figsize=(12, 5))
fig.suptitle("'petroff10' style sheet")
colored_lines_example(ax1)
image_and_patch_example(ax2)
plt.show()