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"""
Builtin colormaps, colormap handling utilities, and the `ScalarMappable` mixin.
.. seealso::
:doc:`/gallery/color/colormap_reference` for a list of builtin colormaps.
:ref:`colormap-manipulation` for examples of how to make
colormaps.
:ref:`colormaps` an in-depth discussion of choosing
colormaps.
:ref:`colormapnorms` for more details about data normalization.
"""
from collections.abc import Mapping
import matplotlib as mpl
from matplotlib import _api, colors
# TODO make this warn on access
from matplotlib.colorizer import _ScalarMappable as ScalarMappable # noqa
from matplotlib._cm import datad
from matplotlib._cm_listed import cmaps as cmaps_listed
from matplotlib._cm_multivar import cmap_families as multivar_cmaps
from matplotlib._cm_bivar import cmaps as bivar_cmaps
_LUTSIZE = mpl.rcParams['image.lut']
def _gen_cmap_registry():
"""
Generate a dict mapping standard colormap names to standard colormaps, as
well as the reversed colormaps.
"""
cmap_d = {**cmaps_listed}
for name, spec in datad.items():
cmap_d[name] = ( # Precache the cmaps at a fixed lutsize..
colors.LinearSegmentedColormap(name, spec, _LUTSIZE)
if 'red' in spec else
colors.ListedColormap(spec['listed'], name)
if 'listed' in spec else
colors.LinearSegmentedColormap.from_list(name, spec, _LUTSIZE))
# Register colormap aliases for gray and grey.
aliases = {
# alias -> original name
'grey': 'gray',
'gist_grey': 'gist_gray',
'gist_yerg': 'gist_yarg',
'Grays': 'Greys',
}
for alias, original_name in aliases.items():
cmap = cmap_d[original_name].copy()
cmap.name = alias
cmap_d[alias] = cmap
# Generate reversed cmaps.
for cmap in list(cmap_d.values()):
rmap = cmap.reversed()
cmap_d[rmap.name] = rmap
return cmap_d
class ColormapRegistry(Mapping):
r"""
Container for colormaps that are known to Matplotlib by name.
The universal registry instance is `matplotlib.colormaps`. There should be
no need for users to instantiate `.ColormapRegistry` themselves.
Read access uses a dict-like interface mapping names to `.Colormap`\s::
import matplotlib as mpl
cmap = mpl.colormaps['viridis']
Returned `.Colormap`\s are copies, so that their modification does not
change the global definition of the colormap.
Additional colormaps can be added via `.ColormapRegistry.register`::
mpl.colormaps.register(my_colormap)
To get a list of all registered colormaps, you can do::
from matplotlib import colormaps
list(colormaps)
"""
def __init__(self, cmaps):
self._cmaps = cmaps
self._builtin_cmaps = tuple(cmaps)
def __getitem__(self, item):
try:
return self._cmaps[item].copy()
except KeyError:
raise KeyError(f"{item!r} is not a known colormap name") from None
def __iter__(self):
return iter(self._cmaps)
def __len__(self):
return len(self._cmaps)
def __str__(self):
return ('ColormapRegistry; available colormaps:\n' +
', '.join(f"'{name}'" for name in self))
def __call__(self):
"""
Return a list of the registered colormap names.
This exists only for backward-compatibility in `.pyplot` which had a
``plt.colormaps()`` method. The recommended way to get this list is
now ``list(colormaps)``.
"""
return list(self)
def register(self, cmap, *, name=None, force=False):
"""
Register a new colormap.
The colormap name can then be used as a string argument to any ``cmap``
parameter in Matplotlib. It is also available in ``pyplot.get_cmap``.
The colormap registry stores a copy of the given colormap, so that
future changes to the original colormap instance do not affect the
registered colormap. Think of this as the registry taking a snapshot
of the colormap at registration.
Parameters
----------
cmap : matplotlib.colors.Colormap
The colormap to register.
name : str, optional
The name for the colormap. If not given, ``cmap.name`` is used.
force : bool, default: False
If False, a ValueError is raised if trying to overwrite an already
registered name. True supports overwriting registered colormaps
other than the builtin colormaps.
"""
_api.check_isinstance(colors.Colormap, cmap=cmap)
name = name or cmap.name
if name in self:
if not force:
# don't allow registering an already existing cmap
# unless explicitly asked to
raise ValueError(
f'A colormap named "{name}" is already registered.')
elif name in self._builtin_cmaps:
# We don't allow overriding a builtin.
raise ValueError("Re-registering the builtin cmap "
f"{name!r} is not allowed.")
# Warn that we are updating an already existing colormap
_api.warn_external(f"Overwriting the cmap {name!r} "
"that was already in the registry.")
self._cmaps[name] = cmap.copy()
# Someone may set the extremes of a builtin colormap and want to register it
# with a different name for future lookups. The object would still have the
# builtin name, so we should update it to the registered name
if self._cmaps[name].name != name:
self._cmaps[name].name = name
def unregister(self, name):
"""
Remove a colormap from the registry.
You cannot remove built-in colormaps.
If the named colormap is not registered, returns with no error, raises
if you try to de-register a default colormap.
.. warning::
Colormap names are currently a shared namespace that may be used
by multiple packages. Use `unregister` only if you know you
have registered that name before. In particular, do not
unregister just in case to clean the name before registering a
new colormap.
Parameters
----------
name : str
The name of the colormap to be removed.
Raises
------
ValueError
If you try to remove a default built-in colormap.
"""
if name in self._builtin_cmaps:
raise ValueError(f"cannot unregister {name!r} which is a builtin "
"colormap.")
self._cmaps.pop(name, None)
def get_cmap(self, cmap):
"""
Return a color map specified through *cmap*.
Parameters
----------
cmap : str or `~matplotlib.colors.Colormap` or None
- if a `.Colormap`, return it
- if a string, look it up in ``mpl.colormaps``
- if None, return the Colormap defined in :rc:`image.cmap`
Returns
-------
Colormap
"""
# get the default color map
if cmap is None:
return self[mpl.rcParams["image.cmap"]]
# if the user passed in a Colormap, simply return it
if isinstance(cmap, colors.Colormap):
return cmap
if isinstance(cmap, str):
_api.check_in_list(sorted(_colormaps), cmap=cmap)
# otherwise, it must be a string so look it up
return self[cmap]
raise TypeError(
'get_cmap expects None or an instance of a str or Colormap . ' +
f'you passed {cmap!r} of type {type(cmap)}'
)
# public access to the colormaps should be via `matplotlib.colormaps`. For now,
# we still create the registry here, but that should stay an implementation
# detail.
_colormaps = ColormapRegistry(_gen_cmap_registry())
globals().update(_colormaps)
_multivar_colormaps = ColormapRegistry(multivar_cmaps)
_bivar_colormaps = ColormapRegistry(bivar_cmaps)
# This is an exact copy of pyplot.get_cmap(). It was removed in 3.9, but apparently
# caused more user trouble than expected. Re-added for 3.9.1 and extended the
# deprecation period for two additional minor releases.
@_api.deprecated(
'3.7',
removal='3.11',
alternative="``matplotlib.colormaps[name]`` or ``matplotlib.colormaps.get_cmap()``"
" or ``pyplot.get_cmap()``"
)
def get_cmap(name=None, lut=None):
"""
Get a colormap instance, defaulting to rc values if *name* is None.
Parameters
----------
name : `~matplotlib.colors.Colormap` or str or None, default: None
If a `.Colormap` instance, it will be returned. Otherwise, the name of
a colormap known to Matplotlib, which will be resampled by *lut*. The
default, None, means :rc:`image.cmap`.
lut : int or None, default: None
If *name* is not already a Colormap instance and *lut* is not None, the
colormap will be resampled to have *lut* entries in the lookup table.
Returns
-------
Colormap
"""
if name is None:
name = mpl.rcParams['image.cmap']
if isinstance(name, colors.Colormap):
return name
_api.check_in_list(sorted(_colormaps), name=name)
if lut is None:
return _colormaps[name]
else:
return _colormaps[name].resampled(lut)
def _ensure_cmap(cmap):
"""
Ensure that we have a `.Colormap` object.
For internal use to preserve type stability of errors.
Parameters
----------
cmap : None, str, Colormap
- if a `Colormap`, return it
- if a string, look it up in mpl.colormaps
- if None, look up the default color map in mpl.colormaps
Returns
-------
Colormap
"""
if isinstance(cmap, colors.Colormap):
return cmap
cmap_name = cmap if cmap is not None else mpl.rcParams["image.cmap"]
# use check_in_list to ensure type stability of the exception raised by
# the internal usage of this (ValueError vs KeyError)
if cmap_name not in _colormaps:
_api.check_in_list(sorted(_colormaps), cmap=cmap_name)
return mpl.colormaps[cmap_name]
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