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Merge pull request #6382 from anntzer/rgba-support
ENH/API: New color conversion machinery
2 parents c94c282 + 7c2ec4c commit 22a7b95

32 files changed

+385
-409
lines changed

‎doc/conf.py

Lines changed: 15 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -334,5 +334,19 @@ def getapi(*args):
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sys.modules['sip'] = mocksip
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sys.modules['PyQt4'] = mockpyqt4
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337-
################# numpydoc config ####################
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# numpydoc config
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numpydoc_show_class_members = False
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# Skip deprecated members
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def skip_deprecated(app, what, name, obj, skip, options):
344+
if skip:
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return skip
346+
skipped = {"matplotlib.colors": ["ColorConverter", "hex2color", "rgb2hex"]}
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skip_list = skipped.get(getattr(obj, "__module__", None))
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if skip_list is not None:
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return getattr(obj, "__name__", None) in skip_list
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def setup(app):
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app.connect('autodoc-skip-member', skip_deprecated)

‎doc/users/colors.rst

Lines changed: 1 addition & 1 deletion
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@@ -9,7 +9,7 @@ it can be provided as:
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* ``(r, g, b)`` tuples
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* ``(r, g, b, a)`` tuples
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* hex string, ex ``#OFOFOF``
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* hex string, ex ``#0F0F0F``, or ``#0F0F0F0F`` (with alpha channel)
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* float value between [0, 1] for gray level
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* One of ``{'b', 'g', 'r', 'c', 'm', 'y', 'k', 'w'}``
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* valid CSS4/X11 color names

‎doc/users/whats_new/rgba-support.rst

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@@ -0,0 +1,11 @@
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Improved color conversion API and RGBA support
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----------------------------------------------
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The :module:`~matplotlib.colors` gained a new color conversion API with
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full support for the alpha channel. The main public functions are
6+
:func:`~matplotlib.colors.is_color_like`, :func:`matplotlib.colors.to_rgba`,
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:func:`matplotlib.colors.to_rgba_array` and :func:`~matplotlib.colors.to_hex`.
8+
RGBA quadruplets are encoded in hex format as `#rrggbbaa`.
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A side benefit is that the Qt options editor now allows setting the alpha
11+
channel of the artists as well.

‎examples/api/collections_demo.py

Lines changed: 2 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -17,8 +17,7 @@
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'''
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import matplotlib.pyplot as plt
20-
from matplotlib import collections, transforms
21-
from matplotlib.colors import colorConverter
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from matplotlib import collections, colors, transforms
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import numpy as np
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nverts = 50
@@ -38,7 +37,7 @@
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xyo = list(zip(xo, yo))
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# Make a list of colors cycling through the default series.
41-
colors = [colorConverter.to_rgba(c)
40+
colors = [colors.to_rgba(c)
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for c in plt.rcParams['axes.prop_cycle'].by_key()['color']]
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fig, axes = plt.subplots(2, 2)

‎examples/color/named_colors.py

Lines changed: 13 additions & 28 deletions
Original file line numberDiff line numberDiff line change
@@ -11,36 +11,19 @@
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import numpy as np
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import matplotlib.pyplot as plt
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from matplotlib import colors
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from matplotlib import colors as mcolors
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17-
colors_ = list(six.iteritems(colors.cnames))
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# Add the single letter colors.
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for name, rgb in six.iteritems(colors.ColorConverter.colors):
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hex_ = colors.rgb2hex(rgb)
22-
colors_.append((name, hex_))
23-
24-
# Transform to hex color values.
25-
hex_ = [color[1] for color in colors_]
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# Get the rgb equivalent.
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rgb = [colors.hex2color(color) for color in hex_]
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# Get the hsv equivalent.
29-
hsv = [colors.rgb_to_hsv(color) for color in rgb]
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# Split the hsv values to sort.
32-
hue = [color[0] for color in hsv]
33-
sat = [color[1] for color in hsv]
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val = [color[2] for color in hsv]
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# Get the color names by themselves.
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names = [color[0] for color in colors_]
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colors = dict(mcolors.BASE_COLORS, **mcolors.CSS4_COLORS)
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# Sort by hue, saturation, value and name.
40-
ind = np.lexsort((names, val, sat, hue))
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sorted_colors = [colors_[i] for i in ind]
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by_hsv = sorted((tuple(mcolors.rgb_to_hsv(mcolors.to_rgba(color)[:3])), name)
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for name, color in colors.items())
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# Get the sorted color names.
24+
sorted_names = [name for hsv, name in by_hsv]
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43-
n = len(sorted_colors)
26+
n = len(sorted_names)
4427
ncols = 4
4528
nrows = int(np.ceil(1. * n / ncols))
4629

@@ -53,7 +36,7 @@
5336
# col width
5437
w = X / ncols
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56-
for i, (name, color) in enumerate(sorted_colors):
39+
for i, name in enumerate(sorted_names):
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col = i % ncols
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row = int(i / ncols)
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y = Y - (row * h) - h
@@ -68,8 +51,10 @@
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# Add extra black line a little bit thicker to make
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# clear colors more visible.
71-
ax.hlines(y, xi_line, xf_line, color='black', linewidth=(h * 0.7))
72-
ax.hlines(y + h * 0.1, xi_line, xf_line, color=color, linewidth=(h * 0.6))
54+
ax.hlines(
55+
y, xi_line, xf_line, color='black', linewidth=(h * 0.7))
56+
ax.hlines(
57+
y + h * 0.1, xi_line, xf_line, color=colors[name], linewidth=(h * 0.6))
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ax.set_xlim(0, X)
7560
ax.set_ylim(0, Y)

‎examples/event_handling/lasso_demo.py

Lines changed: 3 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -7,18 +7,17 @@
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usable as is). There will be some refinement of the API.
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"""
99
from matplotlib.widgets import Lasso
10-
from matplotlib.colors import colorConverter
1110
from matplotlib.collections import RegularPolyCollection
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from matplotlib import path
11+
from matplotlib import colors as mcolors, path
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1413
import matplotlib.pyplot as plt
1514
from numpy import nonzero
1615
from numpy.random import rand
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class Datum(object):
20-
colorin = colorConverter.to_rgba('red')
21-
colorout = colorConverter.to_rgba('blue')
19+
colorin = mcolors.to_rgba("red")
20+
colorout = mcolors.to_rgba("blue")
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2322
def __init__(self, x, y, include=False):
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self.x = x

‎examples/mplot3d/polys3d_demo.py

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -5,16 +5,16 @@
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from mpl_toolkits.mplot3d import Axes3D
77
from matplotlib.collections import PolyCollection
8-
from matplotlib.colors import colorConverter
98
import matplotlib.pyplot as plt
9+
from matplotlib import colors as mcolors
1010
import numpy as np
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1313
def cc(arg):
1414
'''
1515
Shorthand to convert 'named' colors to rgba format at 60% opacity.
1616
'''
17-
return colorConverter.to_rgba(arg, alpha=0.6)
17+
return mcolors.to_rgba(arg, alpha=0.6)
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1919

2020
def polygon_under_graph(xlist, ylist):

‎examples/pylab_examples/colours.py

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -3,12 +3,12 @@
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Some simple functions to generate colours.
44
"""
55
import numpy as np
6-
from matplotlib.colors import colorConverter
6+
from matplotlib import colors as mcolors
77

88

99
def pastel(colour, weight=2.4):
1010
""" Convert colour into a nice pastel shade"""
11-
rgb = np.asarray(colorConverter.to_rgb(colour))
11+
rgb = np.asarray(mcolors.to_rgba(colour)[:3])
1212
# scale colour
1313
maxc = max(rgb)
1414
if maxc < 1.0 and maxc > 0:

‎examples/pylab_examples/demo_ribbon_box.py

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -18,7 +18,7 @@ class RibbonBox(object):
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nx = original_image.shape[1]
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2020
def __init__(self, color):
21-
rgb = matplotlib.colors.colorConverter.to_rgb(color)
21+
rgb = matplotlib.colors.to_rgba(color)[:3]
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2323
im = np.empty(self.original_image.shape,
2424
self.original_image.dtype)

‎examples/pylab_examples/line_collection.py

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,6 @@
11
import matplotlib.pyplot as plt
22
from matplotlib.collections import LineCollection
3-
from matplotlib.colors import colorConverter
3+
from matplotlib import colors as mcolors
44

55
import numpy as np
66

@@ -30,7 +30,7 @@
3030
# where onoffseq is an even length tuple of on and off ink in points.
3131
# If linestyle is omitted, 'solid' is used
3232
# See matplotlib.collections.LineCollection for more information
33-
colors = [colorConverter.to_rgba(c)
33+
colors = [mcolors.to_rgba(c)
3434
for c in plt.rcParams['axes.prop_cycle'].by_key()['color']]
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3636
line_segments = LineCollection(segs, linewidths=(0.5, 1, 1.5, 2),

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