def cubehelix_pal(start=0, rot=.4, gamma=1.0, hue=0.8,
light=.85, dark=.15, reverse=False):
"""
Utility for creating continuous palette from the cubehelix system.
This produces a colormap with linearly-decreasing (or increasing)
brightness. That means that information will be preserved if printed to
black and white or viewed by someone who is colorblind.
Parameters
----------
start : float, 0 <= start <= 3
The hue at the start of the helix.
rot : float
Rotations around the hue wheel over the range of the palette.
gamma : float 0 <= gamma
Gamma factor to emphasize darker (gamma < 1) or lighter (gamma > 1)
colors.
hue : float, 0 <= hue <= 1
Saturation of the colors.
dark : float 0 <= dark <= 1
Intensity of the darkest color in the palette.
light : float 0 <= light <= 1
Intensity of the lightest color in the palette.
reverse : bool
If True, the palette will go from dark to light.
Returns
-------
out : function
Continuous color palette that takes a single
:class:`int` parameter ``n`` and returns ``n``
equally spaced colors.
References
----------
Green, D. A. (2011). "A colour scheme for the display of astronomical
intensity images". Bulletin of the Astromical Society of India, Vol. 39,
p. 289-295.
>>> palette = cubehelix_pal()
>>> palette(5)
['#edd1cb', '#d499a7', '#aa688f', '#6e4071', '#2d1e3e']
"""
cdict = mpl._cm.cubehelix(gamma, start, rot, hue)
cubehelix_cmap = mpl.colors.LinearSegmentedColormap('cubehelix', cdict)
def cubehelix_palette(n):
values = np.linspace(light, dark, n)
return [mcolors.rgb2hex(cubehelix_cmap(x)) for x in values]
return cubehelix_palette
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