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Fix set color for gradient #4285

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Fix set color for gradient #4285

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4 changes: 4 additions & 0 deletions manim/mobject/types/vectorized_mobject.py
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Original file line number Diff line number Diff line change
Expand Up @@ -257,6 +257,10 @@ def update_rgbas_array(
# Match up current rgbas array with the newly calculated
# one. 99% of the time they'll be the same.
curr_rgbas = getattr(self, array_name)
if isinstance(color, (list, tuple)) and len(color) > 1:
start_rgba = ManimColor.parse(color[0]).to_rgba_with_alpha(curr_rgbas[0, 3])
end_rgba = ManimColor.parse(color[-1]).to_rgba_with_alpha(curr_rgbas[-1, 3])
rgbas = np.linspace(start_rgba, end_rgba, len(curr_rgbas))
if len(curr_rgbas) < len(rgbas):
curr_rgbas = stretch_array_to_length(curr_rgbas, len(rgbas))
setattr(self, array_name, curr_rgbas)
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