8000 [SPRINT] Much better alpha control in mplot3d. Closes #1541 by WeatherGod · Pull Request #2169 · matplotlib/matplotlib · GitHub
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[SPRINT] Much better alpha control in mplot3d. Closes #1541 #2169

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[SPRINT] Much better alpha control in mplot3d. Closes #1541 #2169

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Much better alpha control in mplot3d. Closes #1541 
Probably haven't solved them all, but this gets most of them.
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@WeatherGod
WeatherGod committed Jun 28, 2013
commit b83977f46806b35e258413db63618b58e2ef0d02
36 changes: 33 additions & 3 deletions lib/mpl_toolkits/mplot3d/art3d.py
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Original file line number Diff line number Diff line change
8000 Expand Up @@ -9,6 +9,7 @@
'''

from matplotlib import lines, text as mtext, path as mpath, colors as mcolors
from matplotlib import artist
from matplotlib.collections import Collection, LineCollection, \
PolyCollection, PatchCollection
from matplotlib.cm import ScalarMappable
Expand Down Expand Up @@ -318,9 +319,13 @@ def do_3d_projection(self, renderer):
xs, ys, zs = self._offsets3d
vxs, vys, vzs, vis = proj3d.proj_transform_clip(xs, ys, zs, renderer.M)
#FIXME: mpl allows us no way to unset the collection alpha value
self._alpha = None
self.set_facecolors(zalpha(self._facecolor3d, vzs))
self.set_edgecolors(zalpha(self._edgecolor3d, vzs))
#self._alpha = None
fcs = mcolors.colorConverter.to_rgba_array(self._facecolor3d,
self._alpha)
mcs = mcolors.colorConverter.to_rgba_array(self._edgecolor3d,
self._alpha)
self.set_facecolors(zalpha(fcs, vzs))
self.set_edgecolors(zalpha(mcs, vzs))
PatchCollection.set_offsets(self, zip(vxs, vys))

if vzs.size > 0 :
Expand Down Expand Up @@ -427,6 +432,7 @@ def set_3d_properties(self):
self.set_zsort(True)
self._facecolors3d = PolyCollection.get_facecolors(self)
self._edgecolors3d = PolyCollection.get_edgecolors(self)
self._alpha3d = PolyCollection.get_alpha(self)

def set_sort_zpos(self,val):
'''Set the position to use for z-sorting.'''
Expand Down Expand Up @@ -495,6 +501,30 @@ def set_edgecolor(self, colors):
self._edgecolors3d = PolyCollection.get_edgecolor(self)
set_edgecolors = set_edgecolor

def set_alpha(self, alpha):
"""
Set the alpha tranparencies of the collection. *alpha* must be
a float or *None*.

ACCEPTS: float or None
"""
if alpha is not None:
try:
float(alpha)
except TypeError:
raise TypeError('alpha must be a float or None')
artist.Artist.set_alpha(self, alpha)
try:
self._facecolors = mcolors.colorConverter.to_rgba_array(
self._facecolors3d, self._alpha)
except (AttributeError, TypeError, IndexError):
pass
try:
self._edgecolors = mcolors.colorConverter.to_rgba_array(
self._edgecolors3d, self._alpha)
except (AttributeError, TypeError, IndexError):
pass

def get_facecolors(self):
return self._facecolors2d
get_facecolor = get_facecolors
Expand Down
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