Commite6b44f6

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added a reversed section to colormap reference and reversing section to

colormap tutorialCo-authored-by: Jody Klymak <jklymak@gmail.com>Co-authored-by: Tim Hoffmann <2836374+timhoffm@users.noreply.github.com>Co-authored-by: RutgerK <2157033+RutgerK@users.noreply.github.com>Co-authored-by: Thomas A Caswell <tcaswell@gmail.com>

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examples/color
- colormap_reference.py
tutorials/colors
- colormap-manipulation.py

2 files changed

+45

-6

lines changed

`‎examples/color/colormap_reference.py`

Lines changed: 22 additions & 6 deletions

Original file line number	Diff line number	Diff line change
`@@ -6,16 +6,17 @@`
`6`	`6`	`Reference for colormaps included with Matplotlib.`
`7`	`7`
`8`	`8`	`A reversed version of each of these colormaps is available by appending`
`9`		-``_r`` to the name,e.g., ``viridis_r``.
	`9`	+``_r`` to the name,as shown in :ref:`reverse-cmap`.
`10`	`10`
`11`	`11`	See :doc:`/tutorials/colors/colormaps` for an in-depth discussion about
`12`		`-colormaps, including colorblind-friendliness.`
	`12`	`+colormaps, including colorblind-friendliness, and`
	`13`	+:doc:`/tutorials/colors/colormap-manipulation` for a guide to creating
	`14`	`+colormaps.`
`13`	`15`	`"""`
`14`	`16`
`15`	`17`	`importnumpyasnp`
`16`	`18`	`importmatplotlib.pyplotasplt`
`17`	`19`
`18`		`-`
`19`	`20`	`cmaps= [('Perceptually Uniform Sequential', [`
`20`	`21`	`'viridis','plasma','inferno','magma','cividis']),`
`21`	`22`	`('Sequential', [`
`@@ -40,7 +41,6 @@`
`40`	`41`	`'gist_rainbow','rainbow','jet','turbo','nipy_spectral',`
`41`	`42`	`'gist_ncar'])]`
`42`	`43`
`43`		`-`
`44`	`44`	`gradient=np.linspace(0,1,256)`
`45`	`45`	`gradient=np.vstack((gradient,gradient))`
`46`	`46`
`@@ -52,7 +52,7 @@ def plot_color_gradients(cmap_category, cmap_list):`
`52`	`52`	`fig,axs=plt.subplots(nrows=nrows,figsize=(6.4,figh))`
`53`	`53`	`fig.subplots_adjust(top=1-.35/figh,bottom=.15/figh,left=0.2,right=0.99)`
`54`	`54`
`55`		`-axs[0].set_title(cmap_category+'colormaps',fontsize=14)`
	`55`	`+axs[0].set_title(f"{cmap_category}colormaps",fontsize=14)`
`56`	`56`
`57`	`57`	`forax,cmap_nameinzip(axs,cmap_list):`
`58`	`58`	`ax.imshow(gradient,aspect='auto',cmap=cmap_name)`
`@@ -67,7 +67,23 @@ def plot_color_gradients(cmap_category, cmap_list):`
`67`	`67`	`forcmap_category,cmap_listincmaps:`
`68`	`68`	`plot_color_gradients(cmap_category,cmap_list)`
`69`	`69`
`70`		`-plt.show()`
	`70`	`+`
	`71`	`+###############################################################################`
	`72`	`+# .. _reverse-cmap:`
	`73`	`+#`
	`74`	`+# Reversed colormaps`
	`75`	`+# ------------------`
	`76`	`+#`
	`77`	+# Append ``_r`` to the name of any built-in colormap to get the reversed
	`78`	`+# version:`
	`79`	`+`
	`80`	`+plot_color_gradients("Original and reversed ", ['viridis','viridis_r'])`
	`81`	`+`
	`82`	`+# %%`
	`83`	`+# The built-in reversed colormaps are generated when building the`
	`84`	+# `.ColormapRegistry` by calling the ``reversed`` method on the built-in
	`85`	+# colormap objects. See :ref:`reversing-colormap` for more information about
	`86`	+# the ``reversed`` method.
`71`	`87`
`72`	`88`	`#############################################################################`
`73`	`89`	`#`

`‎tutorials/colors/colormap-manipulation.py`

Lines changed: 23 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -255,6 +255,29 @@ def plot_linearmap(cdict):`
`255`	`255`
`256`	`256`	`plot_examples([cmap1,cmap2])`
`257`	`257`
	`258`	`+#############################################################################`
	`259`	`+# .. _reversing-colormap:`
	`260`	`+#`
	`261`	`+# Reversing a colormap`
	`262`	`+# ====================`
	`263`	`+#`
	`264`	+# Any colormap that is a registered as a matplotlib `.Colormap` can be reversed
	`265`	+# using the ``reversed`` method of the colormap object. For example:
	`266`	`+`
	`267`	`+colors= ["#ffffcc","#a1dab4","#41b6c4","#2c7fb8","#253494"]`
	`268`	`+my_cmap=ListedColormap(colors,name="my_cmap")`
	`269`	`+# register`
	`270`	`+mpl.colormaps.register(cmap=my_cmap)`
	`271`	`+# reverse custom colormap`
	`272`	`+mpl.colormaps.register(cmap=my_cmap.reversed())`
	`273`	`+`
	`274`	`+plot_examples(['my_cmap','my_cmap_r'])`
	`275`	`+`
	`276`	`+# %%`
	`277`	`+# This method generates a new colormap by reversing the order of colors in the`
	`278`	`+# source colormap and creates a name for the reversed map by appending`
	`279`	+# ``_r`` to the source colormap's name.
	`280`	`+`
`258`	`281`	`#############################################################################`
`259`	`282`	`#`
`260`	`283`	`# .. admonition:: References`

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Commite6b44f6

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`‎examples/color/colormap_reference.py`

`‎tutorials/colors/colormap-manipulation.py`

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