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Fixed _has_alpha_channel function to work with hex and tuple colors #27463

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Fixed _has_alpha_channel function to work with hex and tuple colors #27463

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58 changes: 56 additions & 2 deletions lib/matplotlib/colors.py
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Original file line number Diff line number Diff line change
Expand Up @@ -231,10 +231,64 @@ def is_color_like(c):
return True


def is_hex_color(c):
"""
(Helper function) Determines if the input string is a
hexadecimal number in color format. String must start
with # or 0x and have 8 bytes following, 2 for each color
and alpha channel.
"""
if not isinstance(c, str):
return False
if c.startswith('#'):
if len(c) != 9:
return False
c = c[1:]
elif c.startswith('0x'):
if len(c) != 10:
return False
c = c[2:]
else:
return False

for x in c:
if x not in '0123456789abcdefABCDEF':
return False

return True


def is_tuple_color(c):
"""
(Helper function) Determines if the input string is a
tuple in color format. Tuple must have two values: the
first representing the color and the second representing
the alpha value.
"""
if not isinstance(c, tuple):
return False
if len(c) != 2:
return False

color = c[0]
if not isinstance(color, str):
return False
if c != 'r' and c != 'g' and c != 'b':
return False

alpha = c[1]
if not isinstance(alpha, float):
return False
if alpha < 0 or alpha > 1:
return False

return True


def _has_alpha_channel(c):
"""Return whether *c* is a color with an alpha channel."""
# 4-element sequences are interpreted as r, g, b, a
return not isinstance(c, str) and len(c) == 4
is_color = not isinstance(c, str) and len(c) == 4
return is_color or is_hex_color(c) or is_tuple_color(c)


def _check_color_like(**kwargs):
Expand Down