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backends: fix alpha handling for cairo and macosx by efiring · Pull Request #437 · matplotlib/matplotlib · GitHub

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backends: fix alpha handling for cairo and macosx #437

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Merged
efiring merged 1 commit into from
Aug 27, 2011
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backends: fix alpha handling for cairo and macosx #437

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7 changes: 6 additions & 1 deletion lib/matplotlib/backend_bases.py
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Original file line number Diff line number Diff line change
Expand Up @@ -774,6 +774,8 @@ def set_alpha(self, alpha):
if alpha is not None:
self._alpha = alpha
self._forced_alpha = True
else:
self._forced_alpha = False

def set_antialiased(self, b):
"""
Expand Down Expand Up @@ -834,7 +836,10 @@ def set_foreground(self, fg, isRGB=False):
else:
self._rgb = colors.colorConverter.to_rgba(fg)
if len(self._rgb) == 4 and not self._forced_alpha:
self._alpha = self._rgb[3]
self.set_alpha(self._rgb[3])
# Use set_alpha method here so that subclasses will
# be calling their own version, which may set their
# own attributes.

def set_graylevel(self, frac):
"""
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2 changes: 2 additions & 0 deletions lib/matplotlib/backends/backend_cairo.py
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Original file line number Diff line number Diff line change
Expand Up @@ -283,6 +283,8 @@ def get_text_width_height_descent(self, s, prop, ismath):
def new_gc(self):
if _debug: print '%s.%s()' % (self.__class__.__name__, _fn_name())
self.gc.ctx.save()
self.gc._alpha = 1.0
self.gc._forced_alpha = False # if True, _alpha overrides A from RGBA
return self.gc


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2 changes: 2 additions & 0 deletions lib/matplotlib/backends/backend_macosx.py
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Expand Up @@ -101,6 +101,8 @@ def draw_quad_mesh(self, gc, master_transform, meshWidth, meshHeight,
def new_gc(self):
self.gc.save()
self.gc.set_hatch(None)
self.gc._alpha = 1.0
self.gc._forced_alpha = False # if True, _alpha overrides A from RGBA
return self.gc

def draw_gouraud_triangle(self, gc, points, colors, transform):
Expand Down
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