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Backport PR #23904 on branch v3.6.x (added a reversing section to colormap reference)#24027

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26 changes: 20 additions & 6 deletionsexamples/color/colormap_reference.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -6,16 +6,17 @@
Reference for colormaps included with Matplotlib.

A reversed version of each of these colormaps is available by appending
``_r`` to the name,e.g., ``viridis_r``.
``_r`` to the name,as shown in :ref:`reverse-cmap`.

See :doc:`/tutorials/colors/colormaps` for an in-depth discussion about
colormaps, including colorblind-friendliness.
colormaps, including colorblind-friendliness, and
:doc:`/tutorials/colors/colormap-manipulation` for a guide to creating
colormaps.
"""

import numpy as np
import matplotlib.pyplot as plt


cmaps = [('Perceptually Uniform Sequential', [
'viridis', 'plasma', 'inferno', 'magma', 'cividis']),
('Sequential', [
Expand All@@ -40,7 +41,6 @@
'gist_rainbow', 'rainbow', 'jet', 'turbo', 'nipy_spectral',
'gist_ncar'])]


gradient = np.linspace(0, 1, 256)
gradient = np.vstack((gradient, gradient))

Expand All@@ -52,7 +52,7 @@ def plot_color_gradients(cmap_category, cmap_list):
fig, axs = plt.subplots(nrows=nrows, figsize=(6.4, figh))
fig.subplots_adjust(top=1-.35/figh, bottom=.15/figh, left=0.2, right=0.99)

axs[0].set_title(cmap_category + 'colormaps', fontsize=14)
axs[0].set_title(f"{cmap_category}colormaps", fontsize=14)

for ax, cmap_name in zip(axs, cmap_list):
ax.imshow(gradient, aspect='auto', cmap=cmap_name)
Expand All@@ -67,7 +67,21 @@ def plot_color_gradients(cmap_category, cmap_list):
for cmap_category, cmap_list in cmaps:
plot_color_gradients(cmap_category, cmap_list)

plt.show()

###############################################################################
# .. _reverse-cmap:
#
# Reversed colormaps
# ------------------
#
# Append ``_r`` to the name of any built-in colormap to get the reversed
# version:

plot_color_gradients("Original and reversed ", ['viridis', 'viridis_r'])

# %%
# The built-in reversed colormaps are generated using `.Colormap.reversed`.
# For an example, see :ref:`reversing-colormap`

#############################################################################
#
Expand Down
14 changes: 7 additions & 7 deletionslib/matplotlib/colors.py
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Expand Up@@ -870,13 +870,13 @@ def reversed(self, name=None):
"""
Return a reversed instance of the Colormap.

.. note:: This function is not implemented for base class.
.. note:: This function is not implemented forthebase class.

Parameters
----------
name : str, optional
The name for the reversed colormap. Ifit'sNone the
namewill be thenameof the parent colormap+ "_r".
The name for the reversed colormap. If None, the
nameis set to ``self.name + "_r"``.

See Also
--------
Expand DownExpand Up@@ -1079,8 +1079,8 @@ def reversed(self, name=None):
Parameters
----------
name : str, optional
The name for the reversed colormap. Ifit'sNone the
namewill be thenameof the parent colormap+ "_r".
The name for the reversed colormap. If None, the
nameis set to ``self.name + "_r"``.

Returns
-------
Expand DownExpand Up@@ -1179,8 +1179,8 @@ def reversed(self, name=None):
Parameters
----------
name : str, optional
The name for the reversed colormap. Ifit'sNone the
namewill be thenameof the parent colormap+ "_r".
The name for the reversed colormap. If None, the
nameis set to ``self.name + "_r"``.

Returns
-------
Expand Down
42 changes: 42 additions & 0 deletionstutorials/colors/colormap-manipulation.py
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Expand Up@@ -255,6 +255,48 @@ def plot_linearmap(cdict):

plot_examples([cmap1, cmap2])

#############################################################################
# .. _reversing-colormap:
#
# Reversing a colormap
# ====================
#
# `.Colormap.reversed` creates a new colormap that is a reversed version of
# the original colormap.

colors = ["#ffffcc", "#a1dab4", "#41b6c4", "#2c7fb8", "#253494"]
my_cmap = ListedColormap(colors, name="my_cmap")

my_cmap_r = my_cmap.reversed()

plot_examples([my_cmap, my_cmap_r])
# %%
# If no name is passed in, ``.reversed`` also names the copy by
# :ref:`appending '_r' <registering-colormap>` to the original colormap's
# name.

##############################################################################
# .. _registering-colormap:
#
# Registering a colormap
# ======================
#
# Colormaps can be added to the `matplotlib.colormaps` list of named colormaps.
# This allows the colormaps to be accessed by name in plotting functions:

# my_cmap, my_cmap_r from reversing a colormap
mpl.colormaps.register(cmap=my_cmap)
mpl.colormaps.register(cmap=my_cmap_r)

data = [[1, 2, 3, 4, 5]]

fig, (ax1, ax2) = plt.subplots(nrows=2)

ax1.imshow(data, cmap='my_cmap')
ax2.imshow(data, cmap='my_cmap_r')

plt.show()

#############################################################################
#
# .. admonition:: References
Expand Down
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