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Update Colorizer/ColorizingArtist to work with MultiNorm #30511

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Update Colorizer/ColorizingArtist to work with MultiNorm #30511

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23fb63c
Update Colorizer/ColorizingArtist to work with MultiNorm
trygvrad Sep 3, 2025
d5c43e0
Updates based on feedback from @QuLogic
trygvrad Sep 10, 2025
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16 changes: 15 additions & 1 deletion lib/matplotlib/cbook.py
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Original file line number Diff line number Diff line change
Expand Up @@ -694,7 +694,21 @@ def safe_masked_invalid(x, copy=False):
try:
xm = np.ma.masked_where(~(np.isfinite(x)), x, copy=False)
except TypeError:
return x
if len(x.dtype.descr) == 1:
# Arrays with dtype 'object' get returned here.
# For example the 'c' kwarg of scatter, which supports multiple types.
# `plt.scatter([3, 4], [2, 5], c=[(1, 0, 0), 'y'])`
return x
else:
# In case of a dtype with multiple fields
# for example image data using a MultiNorm
try:
mask = np.empty(x.shape, dtype=np.dtype('bool, '*len(x.dtype.descr)))
for dd, dm in zip(x.dtype.descr, mask.dtype.descr):
mask[dm[0]] = ~np.isfinite(x[dd[0]])
xm = np.ma.array(x, mask=mask, copy=False)
except TypeError:
return x
return xm


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29 changes: 0 additions & 29 deletions lib/matplotlib/cm.py
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Original file line number Diff line number Diff line change
Expand Up @@ -239,32 +239,3 @@ def get_cmap(self, cmap):
_multivar_colormaps = ColormapRegistry(multivar_cmaps)

_bivar_colormaps = ColormapRegistry(bivar_cmaps)


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 = mpl._val_or_rc(cmap, "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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