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add error message for when len(palette)!=len(categories) #197

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Merged
merged 1 commit into from
Dec 8, 2023
Merged

add error message for when len(palette)!=len(categories) #197

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7 changes: 7 additions & 0 deletions src/spatialdata_plot/pl/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -560,6 +560,13 @@ def _get_colors_for_categorical_obs(
else:
palette = ["grey" for _ in range(len_cat)]
logging.info("input has more than 103 categories. Uniform " "'grey' color will be used for all categories.")
else:
# raise error when user didn't provide the right number of colors in palette
if isinstance(palette, list) and len(palette) != len(categories):
raise ValueError(
f"The number of provided values in the palette ({len(palette)}) doesn't agree with the number of "
f"categories that should be colored ({categories})."
)

# otherwise, single channels turn out grey
color_idx = np.linspace(0, 1, len_cat) if len_cat > 1 else [0.7]
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