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graphics context: use alpha value from foreground color if present #423

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Merged
merged 2 commits into from
Aug 20, 2011
Merged

graphics context: use alpha value from foreground color if present #423

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4c078dd
graphics context: use alpha value from foreground color if present
efiring Aug 17, 2011
356c996
gc: ensure explicitly set alpha overrides the A in rgba.
efiring Aug 19, 2011
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19 changes: 10 additions & 9 deletions lib/matplotlib/backend_bases.py
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Original file line number Diff line number Diff line change
Expand Up @@ -637,6 +637,7 @@ class GraphicsContextBase:

def __init__(self):
self._alpha = 1.0
self._forced_alpha = False # if True, _alpha overrides A from RGBA
self._antialiased = 1 # use 0,1 not True, False for extension code
self._capstyle = 'butt'
self._cliprect = None
Expand Down Expand Up @@ -742,8 +743,7 @@ def get_linewidth(self):

def get_rgb(self):
"""
returns a tuple of three floats from 0-1. color can be a
MATLAB format string, a html hex color string, or a rgb tuple
returns a tuple of three or four floats from 0-1.
"""
return self._rgb

Expand Down Expand Up @@ -771,9 +771,9 @@ def set_alpha(self, alpha):
Set the alpha value used for blending - not supported on
all backends
"""
if alpha is None:
alpha = 1.0
self._alpha = alpha
if alpha is not None:
self._alpha = alpha
self._forced_alpha = True

def set_antialiased(self, b):
"""
Expand Down Expand Up @@ -823,17 +823,18 @@ def set_dashes(self, dash_offset, dash_list):
def set_foreground(self, fg, isRGB=False):
"""
Set the foreground color. fg can be a MATLAB format string, a
html hex color string, an rgb unit tuple, or a float between 0
html hex color string, an rgb or rgba unit tuple, or a float between 0
and 1. In the latter case, grayscale is used.

The :class:`GraphicsContextBase` converts colors to rgb
internally. If you know the color is rgb already, you can set
``isRGB=True`` to avoid the performace hit of the conversion
If you know fg is rgb or rgba, set ``isRGB=True`` for
efficiency.
"""
if isRGB:
self._rgb = fg
else:
self._rgb = colors.colorConverter.to_rgba(fg)
if len(self._rgb) == 4 and not self._forced_alpha:
self._alpha = self._rgb[3]

def set_graylevel(self, frac):
"""
Expand Down