Better colorscheme

Use Cubehelix perceptual rainbow colorscheme, which degrades nicely when
desaturated, with the correct number of elements.

See
http://www.ifweassume.com/2013/05/cubehelix-or-how-i-learned-to-love.html.

Closes https://github.com/Phyks/replot/issues/8.
This commit is contained in:
Lucas Verney 2016-03-09 14:50:30 +01:00
parent 09ea785806
commit af29496245
4 changed files with 4075 additions and 3301 deletions

File diff suppressed because one or more lines are too long

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@ -105,3 +105,6 @@ reuse. For more details, see `LICENSE.txt` file.
the original idea. the original idea.
* [This code](http://central.scipy.org/item/53/1/adaptive-sampling-of-1d-functions) * [This code](http://central.scipy.org/item/53/1/adaptive-sampling-of-1d-functions)
from scipy central for a base code for adaptive sampling. from scipy central for a base code for adaptive sampling.
* [Palettable](https://jiffyclub.github.io/palettable/) for palettes.
* [Cubehelix](http://www.ifweassume.com/2013/05/cubehelix-or-how-i-learned-to-love.html)
colorscheme for nice black and white printing and desaturation compatibility.

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@ -16,6 +16,7 @@ except KeyError:
mpl.use("agg") mpl.use("agg")
import matplotlib.pyplot as plt import matplotlib.pyplot as plt
import numpy as np import numpy as np
import palettable
from replot import adaptive_sampling from replot import adaptive_sampling
from replot import exceptions as exc from replot import exceptions as exc
@ -29,18 +30,20 @@ __VERSION__ = "0.0.1"
# CONSTANTS # # CONSTANTS #
############# #############
_DEFAULT_GROUP = "_" _DEFAULT_GROUP = "_"
# Default palette is husl palette with length 10 color cycle # Default palette is husl palette with length 10 color cycle
_DEFAULT_PALETTE = [ def _default_palette(n):
(0.9677975592919913, 0.44127456009157356, 0.5358103155058701), """
(0.8616090647292522, 0.536495730113334, 0.19548899031476086), Default palette is a CubeHelix perceptual rainbow palette with length the
(0.6804189127793346, 0.6151497514677574, 0.19405452111445337), number of plots.
(0.46810256823426105, 0.6699492535792404, 0.1928958739904499),
(0.20125317221201128, 0.6907920815379025, 0.47966761189275336), :param n: The number of colors in the palette.
(0.21044753832183283, 0.6773105080456748, 0.6433941168468681), :returns: The palette as a list of colors (as RGB tuples).
(0.2197995660828324, 0.6625157876850336, 0.7732093159317209), """
(0.433280341176423, 0.6065273407962815, 0.9585467098271748), return palettable.cubehelix.Cubehelix.make(
(0.8004936186423958, 0.47703363533737203, 0.9579547196007522), start_hue=240., end_hue=-300., min_sat=1., max_sat=2.5,
(0.962272393509669, 0.3976451968965351, 0.8008274363432775)] min_light=0.3, max_light=0.8, gamma=.9, n=n).mpl_colors
class Figure(): class Figure():
@ -51,7 +54,7 @@ class Figure():
def __init__(self, def __init__(self,
xlabel="", ylabel="", title="", xlabel="", ylabel="", title="",
xrange=None, yrange=None, xrange=None, yrange=None,
palette=_DEFAULT_PALETTE, palette=_default_palette,
legend=None, savepath=None, grid=None, legend=None, savepath=None, grid=None,
custom_mpl_rc=None): custom_mpl_rc=None):
""" """
@ -67,8 +70,10 @@ class Figure():
:param palette: Color palette to use (optional). Defaults to a safe \ :param palette: Color palette to use (optional). Defaults to a safe \
palette with compatibility with colorblindness and black and \ palette with compatibility with colorblindness and black and \
white printing. white printing.
:type palette: Either a list of colors (as RGB tuples) or a \ :type palette: Either a list of colors (as RGB tuples) or a function \
:mod:`seaborn` ``color_palette`` object. to call with number of plots as parameter and which returns a \
list of colors (as RGB tuples). You can also pass a Seaborn \
palette directly, or use a Palettable Palette.mpl_colors.
:param legend: Whether to use a legend or not (optional). Defaults to \ :param legend: Whether to use a legend or not (optional). Defaults to \
no legend, except if labels are found on provided plots. \ no legend, except if labels are found on provided plots. \
``False`` to disable completely. ``None`` for default \ ``False`` to disable completely. ``None`` for default \
@ -410,6 +415,10 @@ class Figure():
# If grid is disabled, we plot every group in the same sublot. # If grid is disabled, we plot every group in the same sublot.
axes = {} axes = {}
figure, axis = plt.subplots() figure, axis = plt.subplots()
# Set the palette for the subplot
axis.set_prop_cycle(
self._build_cycler_palette(sum([len(i) for i in self.plots])))
# Set the axis for every subplot
for subplot in self.plots: for subplot in self.plots:
axes[subplot] = axis axes[subplot] = axis
return figure, axes return figure, axes
@ -428,6 +437,9 @@ class Figure():
position, position,
colspan=colspan, colspan=colspan,
rowspan=rowspan) rowspan=rowspan)
# Set the palette for the subplot
axes[symbol].set_prop_cycle(
self._build_cycler_palette(len(self.plots[symbol])))
if _DEFAULT_GROUP not in axes: if _DEFAULT_GROUP not in axes:
# Set the default group axis to None if it is not in the grid # Set the default group axis to None if it is not in the grid
axes[_DEFAULT_GROUP] = None axes[_DEFAULT_GROUP] = None
@ -494,10 +506,16 @@ class Figure():
if self.yrange is not None: if self.yrange is not None:
axis.set_ylim(*self.yrange) axis.set_ylim(*self.yrange)
def _build_cycler_palette(self): def _build_cycler_palette(self, n):
""" """
TODO Build a cycler palette for the selected subplot.
:param n: number of colors in the palette.
:returns: a cycler object for the palette.
""" """
if hasattr(self.palette, "__call__"):
return cycler.cycler("color", self.palette(n))
else:
return cycler.cycler("color", self.palette) return cycler.cycler("color", self.palette)
def _render(self): def _render(self):
@ -508,9 +526,7 @@ class Figure():
""" """
figure = None figure = None
# Use custom matplotlib context # Use custom matplotlib context
palette = self._build_cycler_palette() with mpl_custom_rc_context(rc=self.custom_mpl_rc):
with mpl_custom_rc_context(palette=palette,
rc=self.custom_mpl_rc):
# Create figure # Create figure
figure, axes = self._grid() figure, axes = self._grid()
# Add plots # Add plots
@ -655,35 +671,18 @@ def _mpl_custom_rc_axes_style():
"axes.edgecolor": "white", "axes.edgecolor": "white",
# Grid # Grid
"grid.linestyle": "-", "grid.linestyle": "-",
"grid.color": "white" "grid.color": "white",
# Image
"image.cmap": "Greys"
} }
return rc_params return rc_params
def _mpl_custom_rc_palette(palette): def mpl_custom_rc_context(rc=None):
"""
Set the palette used on the plots.
Settings borrowed from
[Seaborn](https://github.com/mwaskom/seaborn/blob/master/seaborn/rcmod.py#L344).
:param palette: The palette to use, as a :mod:`cycler` ``cycler`` object.
:returns: a :mod:`matplotlib` ``rcParams``-like dict.
"""
rc_params = {
"image.cmap": "Greys",
"axes.prop_cycle": palette,
"patch.facecolor": [v["color"] for v in palette][0]
}
return rc_params
def mpl_custom_rc_context(palette, rc=None):
""" """
Overload ``matplotlib.rcParams`` to enable advanced features if \ Overload ``matplotlib.rcParams`` to enable advanced features if \
available. In particular, use LaTeX if available. available. In particular, use LaTeX if available.
:param palette: The palette to use, as a :mod:`cycler` ``cycler`` object.
:param rc: An optional dict to overload some :mod:`matplotlib` rc params. :param rc: An optional dict to overload some :mod:`matplotlib` rc params.
:returns: A ``matplotlib.rc_context`` object to use in a ``with`` \ :returns: A ``matplotlib.rc_context`` object to use in a ``with`` \
statement. statement.
@ -704,8 +703,6 @@ def mpl_custom_rc_context(palette, rc=None):
custom_rc.update(_mpl_custom_rc_scaling()) custom_rc.update(_mpl_custom_rc_scaling())
# Set axes style # Set axes style
custom_rc.update(_mpl_custom_rc_axes_style()) custom_rc.update(_mpl_custom_rc_axes_style())
# Set palette
custom_rc.update(_mpl_custom_rc_palette(palette))
# Overload if necessary # Overload if necessary
if rc is not None: if rc is not None:
custom_rc.update(rc) custom_rc.update(rc)

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@ -1,3 +1,4 @@
matplotlib>=1.5.1 matplotlib>=1.5.1
numpy>=1.10.4 numpy>=1.10.4
cycler>=0.9.0 cycler>=0.9.0
palettable>=2.1.1