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Handle ListedColormaps in expand and cmap_and_norm #241

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Merged
JamesVarndell merged 2 commits into from
Aug 4, 2026
Merged

Handle ListedColormaps in expand and cmap_and_norm #241

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0678ac7
Handle ListedColormaps in expand and cmap_and_norm
burggraaff Jul 28, 2026
a2500af
Copy definition of colors from expand to cmap_and_norm
burggraaff Jul 28, 2026
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9 changes: 6 additions & 3 deletions src/earthkit/plots/styles/colors/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -69,6 +69,8 @@ def expand(colors, levels, extend_colors=0):
colors = [colors] * (length - 1)
else:
colors = [cmap(i) for i in np.linspace(0, 1, length)]
elif isinstance(colors, ListedColormap):
colors = list(colors.colors)
elif isinstance(colors, mpl.colors.Colormap):
colors = [colors(i) for i in np.linspace(0, 1, length)]
return colors
Expand Down Expand Up @@ -96,8 +98,9 @@ def cmap_and_norm(colors, levels, normalize=True, extend=None, extend_levels=Tru

Parameters
----------
colors : str or list
The name of a matplotlib colormap or a list of colours.
colors : str or list or matplotlib.colors.Colormap
The name of a matplotlib colormap, a list of colours, or a matplotlib
colormap object (e.g. a ``ListedColormap``).
levels : list
The levels for which to generate colours.
normalize : bool, optional
Expand All @@ -108,6 +111,7 @@ def cmap_and_norm(colors, levels, normalize=True, extend=None, extend_levels=Tru
Whether to extend the levels. If False, the levels will be used as is.
If True, the levels will be extended to include the under and over values.
"""
is_listed = isinstance(colors, ListedColormap)
levels = list(levels)
extend_colors = 0
color_levels = levels
Expand All @@ -134,7 +138,6 @@ def cmap_and_norm(colors, levels, normalize=True, extend=None, extend_levels=Tru
N = len(color_levels) + extend_colors - 1

colormap = LinearSegmentedColormap.from_list
is_listed = colors is not None and len(colors) == N
if is_listed:
colormap = ListedColormap

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