8000 Merge pull request #22387 from timhoffm/color-sequences · matplotlib/matplotlib@6997192 · GitHub
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Merge pull request #22387 from timhoffm/color-sequences
Add a registry for color sequences
2 parents c358ba5 + 0abe0ce commit 6997192

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7 files changed

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‎doc/api/colors_api.rst

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@@ -14,27 +14,44 @@
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:no-members:
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:no-inherited-members:
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Classes
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-------
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Color norms
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-----------
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2020
.. autosummary::
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:toctree: _as_gen/
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:template: autosummary.rst
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Normalize
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NoNorm
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AsinhNorm
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BoundaryNorm
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Colormap
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CenteredNorm
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LightSource
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LinearSegmentedColormap
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ListedColormap
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FuncNorm
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LogNorm
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NoNorm
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Normalize
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PowerNorm
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SymLogNorm
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TwoSlopeNorm
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FuncNorm
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Colormaps
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---------
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.. autosummary::
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:toctree: _as_gen/
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:template: autosummary.rst
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Colormap
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LinearSegmentedColormap
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ListedColormap
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Other classes
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-------------
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.. autosummary::
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:toctree: _as_gen/
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:template: autosummary.rst
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ColorSequenceRegistry
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LightSource
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Functions
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---------

‎doc/api/matplotlib_configuration_api.rst

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@@ -52,12 +52,15 @@ Logging
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.. autofunction:: set_loglevel
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Colormaps
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=========
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Colormaps and color sequences
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=============================
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.. autodata:: colormaps
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:no-value:
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.. autodata:: color_sequences
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:no-value:
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Miscellaneous
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=============
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‎doc/api/pyplot_summary.rst

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@@ -31,3 +31,6 @@ For a more in-depth look at colormaps, see the
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.. autodata:: colormaps
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:no-value:
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.. autodata:: color_sequences
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:no-value:

‎lib/matplotlib/__init__.py

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@@ -1455,3 +1455,4 @@ def inner(ax, *args, data=None, **kwargs):
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# workaround: we must defer colormaps import to after loading rcParams, because
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# colormap creation depends on rcParams
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from matplotlib.cm import _colormaps as colormaps
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from matplotlib.colors import _color_sequences as color_sequences

‎lib/matplotlib/colors.py

Lines changed: 109 additions & 2 deletions
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@@ -40,7 +40,7 @@
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"""
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import base64
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from collections.abc import Sized, Sequence
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from collections.abc import Sized, Sequence, Mapping
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import copy
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import functools
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import importlib
@@ -54,7 +54,7 @@
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import matplotlib as mpl
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import numpy as np
57-
from matplotlib import _api, cbook, scale
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from matplotlib import _api, _cm, cbook, scale
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from ._color_data import BASE_COLORS, TABLEAU_COLORS, CSS4_COLORS, XKCD_COLORS
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@@ -94,6 +94,113 @@ def get_named_colors_mapping():
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return _colors_full_map
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class ColorSequenceRegistry(Mapping):
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r"""
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Container for sequences of colors that are known to Matplotlib by name.
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The universal registry instance is `matplotlib.color_sequences`. There
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should be no need for users to instantiate `.ColorSequenceRegistry`
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themselves.
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Read access uses a dict-like interface mapping names to lists of colors::
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import matplotlib as mpl
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cmap = mpl.color_sequences['tab10']
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The returned lists are copies, so that their modification does not change
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the global definition of the color sequence.
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Additional color sequences can be added via
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`.ColorSequenceRegistry.register`::
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mpl.color_sequences.register('rgb', ['r', 'g', 'b'])
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"""
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_BUILTIN_COLOR_SEQUENCES = {
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'tab10': _cm._tab10_data,
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'tab20': _cm._tab20_data,
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'tab20b': _cm._tab20b_data,
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'tab20c': _cm._tab20c_data,
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'Pastel1': _cm._Pastel1_data,
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'Pastel2': _cm._Pastel2_data,
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'Paired': _cm._Paired_data,
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'Accent': _cm._Accent_data,
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'Dark2': _cm._Dark2_data,
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'Set1': _cm._Set1_data,
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'Set2': _cm._Set1_data,
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'Set3': _cm._Set1_data,
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}
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def __init__(self):
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self._color_sequences = {**self._BUILTIN_COLOR_SEQUENCES}
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def __getitem__(self, item):
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try:
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return list(self._color_sequences[item])
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except KeyError:
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raise KeyError(f"{item!r} is not a known color sequence name")
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def __iter__(self):
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return iter(self._color_sequences)
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def __len__(self):
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return len(self._color_sequences)
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def __str__(self):
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return ('ColorSequenceRegistry; available colormaps:\n' +
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', '.join(f"'{name}'" for name in self))
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def register(self, name, color_list):
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"""
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Register a new color sequence.
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The color sequence registry stores a copy of the given *color_list*, so
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that future changes to the original list do not affect the registered
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color sequence. Think of this as the registry taking a snapshot
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of *color_list* at registration.
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Parameters
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----------
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name : str
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The name for the color sequence.
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color_list : list of colors
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An iterable returning valid Matplotlib colors when iterating over.
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Note however that the returned color sequence will always be a
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list regardless of the input type.
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"""
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if name in self._BUILTIN_COLOR_SEQUENCES:
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raise ValueError(f"{name!r} is a reserved name for a builtin "
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"color sequence")
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color_list = list(color_list) # force copy and coerce type to list
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for color in color_list:
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try:
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to_rgba(color)
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except ValueError:
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raise ValueError(
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f"{color!r} is not a valid color specification")
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self._color_sequences[name] = color_list
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def unregister(self, name):
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"""
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Remove a sequence from the registry.
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You cannot remove built-in color sequences.
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If the name is not registered, returns with no error.
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"""
195+
if name in self._BUILTIN_COLOR_SEQUENCES:
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raise ValueError(
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f"Cannot unregister builtin color sequence {name!r}")
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self._color_sequences.pop(name, None)
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_color_sequences = ColorSequenceRegistry()
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def _sanitize_extrema(ex):
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if ex is None:
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return ex

‎lib/matplotlib/pyplot.py

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@@ -71,6 +71,7 @@
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from matplotlib import cm
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from matplotlib.cm import _colormaps as colormaps, get_cmap, register_cmap
74+
from matplotlib.colors import _color_sequences as color_sequences
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import numpy as np
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‎lib/matplotlib/tests/test_colors.py

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@@ -1510,3 +1510,43 @@ def test_make_norm_from_scale_name():
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logitnorm = mcolors.make_norm_from_scale(
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mscale.LogitScale, mcolors.Normalize)
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assert logitnorm.__name__ == logitnorm.__qualname__ == "LogitScaleNorm"
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def test_color_sequences():
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# basic access
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assert plt.color_sequences is matplotlib.color_sequences # same registry
1518+
assert list(plt.color_sequences) == [
1519+
'tab10', 'tab20', 'tab20b', 'tab20c', 'Pastel1', 'Pastel2', 'Paired',
1520+
'Accent', 'Dark2', 'Set1', 'Set2', 'Set3']
1521+
assert len(plt.color_sequences['tab10']) == 10
1522+
assert len(plt.color_sequences['tab20']) == 20
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1524+
tab_colors = [
1525+
'tab:blue', 'tab:orange', 'tab:green', 'tab:red', 'tab:purple',
1526+
'tab:brown', 'tab:pink', 'tab:gray', 'tab:olive', 'tab:cyan']
1527+
for seq_color, tab_color in zip(plt.color_sequences['tab10'], tab_colors):
1528+
assert mcolors.same_color(seq_color, tab_color)
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1530+
# registering
1531+
with pytest.raises(ValueError, match="reserved name"):
1532+
plt.color_sequences.register('tab10', ['r', 'g', 'b'])
1533+
with pytest.raises(ValueError, match="not a valid color specification"):
1534+
plt.color_sequences.register('invalid', ['not a color'])
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1536+
rgb_colors = ['r', 'g', 'b']
1537+
plt.color_sequences.register('rgb', rgb_colors)
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assert plt.color_sequences['rgb'] == ['r', 'g', 'b']
1539+
# should not affect the registered sequence because input is copied
1540+
rgb_colors.append('c')
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assert plt.color_sequences['rgb'] == ['r', 'g', 'b']
1542+
# should not affect the registered sequence because returned list is a copy
1543+
plt.color_sequences['rgb'].append('c')
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assert plt.color_sequences['rgb'] == ['r', 'g', 'b']
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1546+
# unregister
1547+
plt.color_sequences.unregister('rgb')
1548+
with pytest.raises(KeyError):
1549+
plt.color_sequences['rgb'] # rgb is gone
1550+
plt.color_sequences.unregister('rgb') # multiple unregisters are ok
1551+
with pytest.raises(ValueError, match="Cannot unregister builtin"):
1552+
plt.color_sequences.unregister('tab10')

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