forked from 170010011/fr
730 lines
26 KiB
Python
730 lines
26 KiB
Python
"""
|
|
Default legend handlers.
|
|
|
|
It is strongly encouraged to have read the :doc:`legend guide
|
|
</tutorials/intermediate/legend_guide>` before this documentation.
|
|
|
|
Legend handlers are expected to be a callable object with a following
|
|
signature. ::
|
|
|
|
legend_handler(legend, orig_handle, fontsize, handlebox)
|
|
|
|
Where *legend* is the legend itself, *orig_handle* is the original
|
|
plot, *fontsize* is the fontsize in pixels, and *handlebox* is a
|
|
OffsetBox instance. Within the call, you should create relevant
|
|
artists (using relevant properties from the *legend* and/or
|
|
*orig_handle*) and add them into the handlebox. The artists needs to
|
|
be scaled according to the fontsize (note that the size is in pixel,
|
|
i.e., this is dpi-scaled value).
|
|
|
|
This module includes definition of several legend handler classes
|
|
derived from the base class (HandlerBase) with the following method::
|
|
|
|
def legend_artist(self, legend, orig_handle, fontsize, handlebox)
|
|
"""
|
|
|
|
from itertools import cycle
|
|
|
|
import numpy as np
|
|
|
|
from matplotlib import cbook
|
|
from matplotlib.lines import Line2D
|
|
from matplotlib.patches import Rectangle
|
|
import matplotlib.collections as mcoll
|
|
import matplotlib.colors as mcolors
|
|
|
|
|
|
def update_from_first_child(tgt, src):
|
|
first_child = next(iter(src.get_children()), None)
|
|
if first_child is not None:
|
|
tgt.update_from(first_child)
|
|
|
|
|
|
class HandlerBase:
|
|
"""
|
|
A Base class for default legend handlers.
|
|
|
|
The derived classes are meant to override *create_artists* method, which
|
|
has a following signature.::
|
|
|
|
def create_artists(self, legend, orig_handle,
|
|
xdescent, ydescent, width, height, fontsize,
|
|
trans):
|
|
|
|
The overridden method needs to create artists of the given
|
|
transform that fits in the given dimension (xdescent, ydescent,
|
|
width, height) that are scaled by fontsize if necessary.
|
|
|
|
"""
|
|
def __init__(self, xpad=0., ypad=0., update_func=None):
|
|
self._xpad, self._ypad = xpad, ypad
|
|
self._update_prop_func = update_func
|
|
|
|
def _update_prop(self, legend_handle, orig_handle):
|
|
if self._update_prop_func is None:
|
|
self._default_update_prop(legend_handle, orig_handle)
|
|
else:
|
|
self._update_prop_func(legend_handle, orig_handle)
|
|
|
|
def _default_update_prop(self, legend_handle, orig_handle):
|
|
legend_handle.update_from(orig_handle)
|
|
|
|
def update_prop(self, legend_handle, orig_handle, legend):
|
|
|
|
self._update_prop(legend_handle, orig_handle)
|
|
|
|
legend._set_artist_props(legend_handle)
|
|
legend_handle.set_clip_box(None)
|
|
legend_handle.set_clip_path(None)
|
|
|
|
def adjust_drawing_area(self, legend, orig_handle,
|
|
xdescent, ydescent, width, height, fontsize,
|
|
):
|
|
xdescent = xdescent - self._xpad * fontsize
|
|
ydescent = ydescent - self._ypad * fontsize
|
|
width = width - self._xpad * fontsize
|
|
height = height - self._ypad * fontsize
|
|
return xdescent, ydescent, width, height
|
|
|
|
def legend_artist(self, legend, orig_handle,
|
|
fontsize, handlebox):
|
|
"""
|
|
Return the artist that this HandlerBase generates for the given
|
|
original artist/handle.
|
|
|
|
Parameters
|
|
----------
|
|
legend : `~matplotlib.legend.Legend`
|
|
The legend for which these legend artists are being created.
|
|
orig_handle : :class:`matplotlib.artist.Artist` or similar
|
|
The object for which these legend artists are being created.
|
|
fontsize : int
|
|
The fontsize in pixels. The artists being created should
|
|
be scaled according to the given fontsize.
|
|
handlebox : `matplotlib.offsetbox.OffsetBox`
|
|
The box which has been created to hold this legend entry's
|
|
artists. Artists created in the `legend_artist` method must
|
|
be added to this handlebox inside this method.
|
|
|
|
"""
|
|
xdescent, ydescent, width, height = self.adjust_drawing_area(
|
|
legend, orig_handle,
|
|
handlebox.xdescent, handlebox.ydescent,
|
|
handlebox.width, handlebox.height,
|
|
fontsize)
|
|
artists = self.create_artists(legend, orig_handle,
|
|
xdescent, ydescent, width, height,
|
|
fontsize, handlebox.get_transform())
|
|
|
|
# create_artists will return a list of artists.
|
|
for a in artists:
|
|
handlebox.add_artist(a)
|
|
|
|
# we only return the first artist
|
|
return artists[0]
|
|
|
|
def create_artists(self, legend, orig_handle,
|
|
xdescent, ydescent, width, height, fontsize,
|
|
trans):
|
|
raise NotImplementedError('Derived must override')
|
|
|
|
|
|
class HandlerNpoints(HandlerBase):
|
|
"""
|
|
A legend handler that shows *numpoints* points in the legend entry.
|
|
"""
|
|
def __init__(self, marker_pad=0.3, numpoints=None, **kw):
|
|
"""
|
|
Parameters
|
|
----------
|
|
marker_pad : float
|
|
Padding between points in legend entry.
|
|
|
|
numpoints : int
|
|
Number of points to show in legend entry.
|
|
|
|
Notes
|
|
-----
|
|
Any other keyword arguments are given to `HandlerBase`.
|
|
"""
|
|
HandlerBase.__init__(self, **kw)
|
|
|
|
self._numpoints = numpoints
|
|
self._marker_pad = marker_pad
|
|
|
|
def get_numpoints(self, legend):
|
|
if self._numpoints is None:
|
|
return legend.numpoints
|
|
else:
|
|
return self._numpoints
|
|
|
|
def get_xdata(self, legend, xdescent, ydescent, width, height, fontsize):
|
|
numpoints = self.get_numpoints(legend)
|
|
if numpoints > 1:
|
|
# we put some pad here to compensate the size of the marker
|
|
pad = self._marker_pad * fontsize
|
|
xdata = np.linspace(-xdescent + pad,
|
|
-xdescent + width - pad,
|
|
numpoints)
|
|
xdata_marker = xdata
|
|
else:
|
|
xdata = [-xdescent, -xdescent + width]
|
|
xdata_marker = [-xdescent + 0.5 * width]
|
|
return xdata, xdata_marker
|
|
|
|
|
|
class HandlerNpointsYoffsets(HandlerNpoints):
|
|
"""
|
|
A legend handler that shows *numpoints* in the legend, and allows them to
|
|
be individually offset in the y-direction.
|
|
"""
|
|
def __init__(self, numpoints=None, yoffsets=None, **kw):
|
|
"""
|
|
Parameters
|
|
----------
|
|
numpoints : int
|
|
Number of points to show in legend entry.
|
|
|
|
yoffsets : array of floats
|
|
Length *numpoints* list of y offsets for each point in
|
|
legend entry.
|
|
|
|
Notes
|
|
-----
|
|
Any other keyword arguments are given to `HandlerNpoints`.
|
|
"""
|
|
HandlerNpoints.__init__(self, numpoints=numpoints, **kw)
|
|
self._yoffsets = yoffsets
|
|
|
|
def get_ydata(self, legend, xdescent, ydescent, width, height, fontsize):
|
|
if self._yoffsets is None:
|
|
ydata = height * legend._scatteryoffsets
|
|
else:
|
|
ydata = height * np.asarray(self._yoffsets)
|
|
|
|
return ydata
|
|
|
|
|
|
class HandlerLine2D(HandlerNpoints):
|
|
"""
|
|
Handler for `.Line2D` instances.
|
|
"""
|
|
def __init__(self, marker_pad=0.3, numpoints=None, **kw):
|
|
"""
|
|
Parameters
|
|
----------
|
|
marker_pad : float
|
|
Padding between points in legend entry.
|
|
|
|
numpoints : int
|
|
Number of points to show in legend entry.
|
|
|
|
Notes
|
|
-----
|
|
Any other keyword arguments are given to `HandlerNpoints`.
|
|
"""
|
|
HandlerNpoints.__init__(self, marker_pad=marker_pad,
|
|
numpoints=numpoints, **kw)
|
|
|
|
def create_artists(self, legend, orig_handle,
|
|
xdescent, ydescent, width, height, fontsize,
|
|
trans):
|
|
|
|
xdata, xdata_marker = self.get_xdata(legend, xdescent, ydescent,
|
|
width, height, fontsize)
|
|
|
|
ydata = np.full_like(xdata, ((height - ydescent) / 2))
|
|
legline = Line2D(xdata, ydata)
|
|
|
|
self.update_prop(legline, orig_handle, legend)
|
|
legline.set_drawstyle('default')
|
|
legline.set_marker("")
|
|
|
|
legline_marker = Line2D(xdata_marker, ydata[:len(xdata_marker)])
|
|
self.update_prop(legline_marker, orig_handle, legend)
|
|
legline_marker.set_linestyle('None')
|
|
if legend.markerscale != 1:
|
|
newsz = legline_marker.get_markersize() * legend.markerscale
|
|
legline_marker.set_markersize(newsz)
|
|
# we don't want to add this to the return list because
|
|
# the texts and handles are assumed to be in one-to-one
|
|
# correspondence.
|
|
legline._legmarker = legline_marker
|
|
|
|
legline.set_transform(trans)
|
|
legline_marker.set_transform(trans)
|
|
|
|
return [legline, legline_marker]
|
|
|
|
|
|
class HandlerPatch(HandlerBase):
|
|
"""
|
|
Handler for `.Patch` instances.
|
|
"""
|
|
def __init__(self, patch_func=None, **kw):
|
|
"""
|
|
Parameters
|
|
----------
|
|
patch_func : callable, optional
|
|
The function that creates the legend key artist.
|
|
*patch_func* should have the signature::
|
|
|
|
def patch_func(legend=legend, orig_handle=orig_handle,
|
|
xdescent=xdescent, ydescent=ydescent,
|
|
width=width, height=height, fontsize=fontsize)
|
|
|
|
Subsequently the created artist will have its ``update_prop``
|
|
method called and the appropriate transform will be applied.
|
|
|
|
Notes
|
|
-----
|
|
Any other keyword arguments are given to `HandlerBase`.
|
|
"""
|
|
HandlerBase.__init__(self, **kw)
|
|
self._patch_func = patch_func
|
|
|
|
def _create_patch(self, legend, orig_handle,
|
|
xdescent, ydescent, width, height, fontsize):
|
|
if self._patch_func is None:
|
|
p = Rectangle(xy=(-xdescent, -ydescent),
|
|
width=width, height=height)
|
|
else:
|
|
p = self._patch_func(legend=legend, orig_handle=orig_handle,
|
|
xdescent=xdescent, ydescent=ydescent,
|
|
width=width, height=height, fontsize=fontsize)
|
|
return p
|
|
|
|
def create_artists(self, legend, orig_handle,
|
|
xdescent, ydescent, width, height, fontsize, trans):
|
|
p = self._create_patch(legend, orig_handle,
|
|
xdescent, ydescent, width, height, fontsize)
|
|
self.update_prop(p, orig_handle, legend)
|
|
p.set_transform(trans)
|
|
return [p]
|
|
|
|
|
|
class HandlerLineCollection(HandlerLine2D):
|
|
"""
|
|
Handler for `.LineCollection` instances.
|
|
"""
|
|
def get_numpoints(self, legend):
|
|
if self._numpoints is None:
|
|
return legend.scatterpoints
|
|
else:
|
|
return self._numpoints
|
|
|
|
def _default_update_prop(self, legend_handle, orig_handle):
|
|
lw = orig_handle.get_linewidths()[0]
|
|
dashes = orig_handle._us_linestyles[0]
|
|
color = orig_handle.get_colors()[0]
|
|
legend_handle.set_color(color)
|
|
legend_handle.set_linestyle(dashes)
|
|
legend_handle.set_linewidth(lw)
|
|
|
|
def create_artists(self, legend, orig_handle,
|
|
xdescent, ydescent, width, height, fontsize, trans):
|
|
|
|
xdata, xdata_marker = self.get_xdata(legend, xdescent, ydescent,
|
|
width, height, fontsize)
|
|
ydata = np.full_like(xdata, (height - ydescent) / 2)
|
|
legline = Line2D(xdata, ydata)
|
|
|
|
self.update_prop(legline, orig_handle, legend)
|
|
legline.set_transform(trans)
|
|
|
|
return [legline]
|
|
|
|
|
|
class HandlerRegularPolyCollection(HandlerNpointsYoffsets):
|
|
r"""Handler for `.RegularPolyCollection`\s."""
|
|
|
|
def __init__(self, yoffsets=None, sizes=None, **kw):
|
|
HandlerNpointsYoffsets.__init__(self, yoffsets=yoffsets, **kw)
|
|
|
|
self._sizes = sizes
|
|
|
|
def get_numpoints(self, legend):
|
|
if self._numpoints is None:
|
|
return legend.scatterpoints
|
|
else:
|
|
return self._numpoints
|
|
|
|
def get_sizes(self, legend, orig_handle,
|
|
xdescent, ydescent, width, height, fontsize):
|
|
if self._sizes is None:
|
|
handle_sizes = orig_handle.get_sizes()
|
|
if not len(handle_sizes):
|
|
handle_sizes = [1]
|
|
size_max = max(handle_sizes) * legend.markerscale ** 2
|
|
size_min = min(handle_sizes) * legend.markerscale ** 2
|
|
|
|
numpoints = self.get_numpoints(legend)
|
|
if numpoints < 4:
|
|
sizes = [.5 * (size_max + size_min), size_max,
|
|
size_min][:numpoints]
|
|
else:
|
|
rng = (size_max - size_min)
|
|
sizes = rng * np.linspace(0, 1, numpoints) + size_min
|
|
else:
|
|
sizes = self._sizes
|
|
|
|
return sizes
|
|
|
|
def update_prop(self, legend_handle, orig_handle, legend):
|
|
|
|
self._update_prop(legend_handle, orig_handle)
|
|
|
|
legend_handle.set_figure(legend.figure)
|
|
# legend._set_artist_props(legend_handle)
|
|
legend_handle.set_clip_box(None)
|
|
legend_handle.set_clip_path(None)
|
|
|
|
def create_collection(self, orig_handle, sizes, offsets, transOffset):
|
|
p = type(orig_handle)(orig_handle.get_numsides(),
|
|
rotation=orig_handle.get_rotation(),
|
|
sizes=sizes,
|
|
offsets=offsets,
|
|
transOffset=transOffset,
|
|
)
|
|
return p
|
|
|
|
def create_artists(self, legend, orig_handle,
|
|
xdescent, ydescent, width, height, fontsize,
|
|
trans):
|
|
xdata, xdata_marker = self.get_xdata(legend, xdescent, ydescent,
|
|
width, height, fontsize)
|
|
|
|
ydata = self.get_ydata(legend, xdescent, ydescent,
|
|
width, height, fontsize)
|
|
|
|
sizes = self.get_sizes(legend, orig_handle, xdescent, ydescent,
|
|
width, height, fontsize)
|
|
|
|
p = self.create_collection(orig_handle, sizes,
|
|
offsets=list(zip(xdata_marker, ydata)),
|
|
transOffset=trans)
|
|
|
|
self.update_prop(p, orig_handle, legend)
|
|
p._transOffset = trans
|
|
return [p]
|
|
|
|
|
|
class HandlerPathCollection(HandlerRegularPolyCollection):
|
|
r"""Handler for `.PathCollection`\s, which are used by `~.Axes.scatter`."""
|
|
def create_collection(self, orig_handle, sizes, offsets, transOffset):
|
|
p = type(orig_handle)([orig_handle.get_paths()[0]],
|
|
sizes=sizes,
|
|
offsets=offsets,
|
|
transOffset=transOffset,
|
|
)
|
|
return p
|
|
|
|
|
|
class HandlerCircleCollection(HandlerRegularPolyCollection):
|
|
r"""Handler for `.CircleCollection`\s."""
|
|
def create_collection(self, orig_handle, sizes, offsets, transOffset):
|
|
p = type(orig_handle)(sizes,
|
|
offsets=offsets,
|
|
transOffset=transOffset,
|
|
)
|
|
return p
|
|
|
|
|
|
class HandlerErrorbar(HandlerLine2D):
|
|
"""Handler for Errorbars."""
|
|
|
|
def __init__(self, xerr_size=0.5, yerr_size=None,
|
|
marker_pad=0.3, numpoints=None, **kw):
|
|
|
|
self._xerr_size = xerr_size
|
|
self._yerr_size = yerr_size
|
|
|
|
HandlerLine2D.__init__(self, marker_pad=marker_pad,
|
|
numpoints=numpoints, **kw)
|
|
|
|
def get_err_size(self, legend, xdescent, ydescent,
|
|
width, height, fontsize):
|
|
xerr_size = self._xerr_size * fontsize
|
|
|
|
if self._yerr_size is None:
|
|
yerr_size = xerr_size
|
|
else:
|
|
yerr_size = self._yerr_size * fontsize
|
|
|
|
return xerr_size, yerr_size
|
|
|
|
def create_artists(self, legend, orig_handle,
|
|
xdescent, ydescent, width, height, fontsize,
|
|
trans):
|
|
|
|
plotlines, caplines, barlinecols = orig_handle
|
|
|
|
xdata, xdata_marker = self.get_xdata(legend, xdescent, ydescent,
|
|
width, height, fontsize)
|
|
|
|
ydata = np.full_like(xdata, (height - ydescent) / 2)
|
|
legline = Line2D(xdata, ydata)
|
|
|
|
xdata_marker = np.asarray(xdata_marker)
|
|
ydata_marker = np.asarray(ydata[:len(xdata_marker)])
|
|
|
|
xerr_size, yerr_size = self.get_err_size(legend, xdescent, ydescent,
|
|
width, height, fontsize)
|
|
|
|
legline_marker = Line2D(xdata_marker, ydata_marker)
|
|
|
|
# when plotlines are None (only errorbars are drawn), we just
|
|
# make legline invisible.
|
|
if plotlines is None:
|
|
legline.set_visible(False)
|
|
legline_marker.set_visible(False)
|
|
else:
|
|
self.update_prop(legline, plotlines, legend)
|
|
|
|
legline.set_drawstyle('default')
|
|
legline.set_marker('None')
|
|
|
|
self.update_prop(legline_marker, plotlines, legend)
|
|
legline_marker.set_linestyle('None')
|
|
|
|
if legend.markerscale != 1:
|
|
newsz = legline_marker.get_markersize() * legend.markerscale
|
|
legline_marker.set_markersize(newsz)
|
|
|
|
handle_barlinecols = []
|
|
handle_caplines = []
|
|
|
|
if orig_handle.has_xerr:
|
|
verts = [((x - xerr_size, y), (x + xerr_size, y))
|
|
for x, y in zip(xdata_marker, ydata_marker)]
|
|
coll = mcoll.LineCollection(verts)
|
|
self.update_prop(coll, barlinecols[0], legend)
|
|
handle_barlinecols.append(coll)
|
|
|
|
if caplines:
|
|
capline_left = Line2D(xdata_marker - xerr_size, ydata_marker)
|
|
capline_right = Line2D(xdata_marker + xerr_size, ydata_marker)
|
|
self.update_prop(capline_left, caplines[0], legend)
|
|
self.update_prop(capline_right, caplines[0], legend)
|
|
capline_left.set_marker("|")
|
|
capline_right.set_marker("|")
|
|
|
|
handle_caplines.append(capline_left)
|
|
handle_caplines.append(capline_right)
|
|
|
|
if orig_handle.has_yerr:
|
|
verts = [((x, y - yerr_size), (x, y + yerr_size))
|
|
for x, y in zip(xdata_marker, ydata_marker)]
|
|
coll = mcoll.LineCollection(verts)
|
|
self.update_prop(coll, barlinecols[0], legend)
|
|
handle_barlinecols.append(coll)
|
|
|
|
if caplines:
|
|
capline_left = Line2D(xdata_marker, ydata_marker - yerr_size)
|
|
capline_right = Line2D(xdata_marker, ydata_marker + yerr_size)
|
|
self.update_prop(capline_left, caplines[0], legend)
|
|
self.update_prop(capline_right, caplines[0], legend)
|
|
capline_left.set_marker("_")
|
|
capline_right.set_marker("_")
|
|
|
|
handle_caplines.append(capline_left)
|
|
handle_caplines.append(capline_right)
|
|
|
|
artists = [
|
|
*handle_barlinecols, *handle_caplines, legline, legline_marker,
|
|
]
|
|
for artist in artists:
|
|
artist.set_transform(trans)
|
|
return artists
|
|
|
|
|
|
class HandlerStem(HandlerNpointsYoffsets):
|
|
"""
|
|
Handler for plots produced by `~.Axes.stem`.
|
|
"""
|
|
def __init__(self, marker_pad=0.3, numpoints=None,
|
|
bottom=None, yoffsets=None, **kw):
|
|
"""
|
|
Parameters
|
|
----------
|
|
marker_pad : float, default: 0.3
|
|
Padding between points in legend entry.
|
|
|
|
numpoints : int, optional
|
|
Number of points to show in legend entry.
|
|
|
|
bottom : float, optional
|
|
|
|
yoffsets : array of floats, optional
|
|
Length *numpoints* list of y offsets for each point in
|
|
legend entry.
|
|
|
|
Notes
|
|
-----
|
|
Any other keyword arguments are given to `HandlerNpointsYoffsets`.
|
|
"""
|
|
|
|
HandlerNpointsYoffsets.__init__(self, marker_pad=marker_pad,
|
|
numpoints=numpoints,
|
|
yoffsets=yoffsets,
|
|
**kw)
|
|
self._bottom = bottom
|
|
|
|
def get_ydata(self, legend, xdescent, ydescent, width, height, fontsize):
|
|
if self._yoffsets is None:
|
|
ydata = height * (0.5 * legend._scatteryoffsets + 0.5)
|
|
else:
|
|
ydata = height * np.asarray(self._yoffsets)
|
|
|
|
return ydata
|
|
|
|
def create_artists(self, legend, orig_handle,
|
|
xdescent, ydescent, width, height, fontsize,
|
|
trans):
|
|
markerline, stemlines, baseline = orig_handle
|
|
# Check to see if the stemcontainer is storing lines as a list or a
|
|
# LineCollection. Eventually using a list will be removed, and this
|
|
# logic can also be removed.
|
|
using_linecoll = isinstance(stemlines, mcoll.LineCollection)
|
|
|
|
xdata, xdata_marker = self.get_xdata(legend, xdescent, ydescent,
|
|
width, height, fontsize)
|
|
|
|
ydata = self.get_ydata(legend, xdescent, ydescent,
|
|
width, height, fontsize)
|
|
|
|
if self._bottom is None:
|
|
bottom = 0.
|
|
else:
|
|
bottom = self._bottom
|
|
|
|
leg_markerline = Line2D(xdata_marker, ydata[:len(xdata_marker)])
|
|
self.update_prop(leg_markerline, markerline, legend)
|
|
|
|
leg_stemlines = [Line2D([x, x], [bottom, y])
|
|
for x, y in zip(xdata_marker, ydata)]
|
|
|
|
if using_linecoll:
|
|
# change the function used by update_prop() from the default
|
|
# to one that handles LineCollection
|
|
with cbook._setattr_cm(
|
|
self, _update_prop_func=self._copy_collection_props):
|
|
for line in leg_stemlines:
|
|
self.update_prop(line, stemlines, legend)
|
|
|
|
else:
|
|
for lm, m in zip(leg_stemlines, stemlines):
|
|
self.update_prop(lm, m, legend)
|
|
|
|
leg_baseline = Line2D([np.min(xdata), np.max(xdata)],
|
|
[bottom, bottom])
|
|
self.update_prop(leg_baseline, baseline, legend)
|
|
|
|
artists = [*leg_stemlines, leg_baseline, leg_markerline]
|
|
for artist in artists:
|
|
artist.set_transform(trans)
|
|
return artists
|
|
|
|
def _copy_collection_props(self, legend_handle, orig_handle):
|
|
"""
|
|
Copy properties from the `.LineCollection` *orig_handle* to the
|
|
`.Line2D` *legend_handle*.
|
|
"""
|
|
legend_handle.set_color(orig_handle.get_color()[0])
|
|
legend_handle.set_linestyle(orig_handle.get_linestyle()[0])
|
|
|
|
|
|
class HandlerTuple(HandlerBase):
|
|
"""
|
|
Handler for Tuple.
|
|
|
|
Additional kwargs are passed through to `HandlerBase`.
|
|
|
|
Parameters
|
|
----------
|
|
ndivide : int, default: 1
|
|
The number of sections to divide the legend area into. If None,
|
|
use the length of the input tuple.
|
|
pad : float, default: :rc:`legend.borderpad`
|
|
Padding in units of fraction of font size.
|
|
"""
|
|
|
|
def __init__(self, ndivide=1, pad=None, **kwargs):
|
|
self._ndivide = ndivide
|
|
self._pad = pad
|
|
HandlerBase.__init__(self, **kwargs)
|
|
|
|
def create_artists(self, legend, orig_handle,
|
|
xdescent, ydescent, width, height, fontsize,
|
|
trans):
|
|
|
|
handler_map = legend.get_legend_handler_map()
|
|
|
|
if self._ndivide is None:
|
|
ndivide = len(orig_handle)
|
|
else:
|
|
ndivide = self._ndivide
|
|
|
|
if self._pad is None:
|
|
pad = legend.borderpad * fontsize
|
|
else:
|
|
pad = self._pad * fontsize
|
|
|
|
if ndivide > 1:
|
|
width = (width - pad * (ndivide - 1)) / ndivide
|
|
|
|
xds_cycle = cycle(xdescent - (width + pad) * np.arange(ndivide))
|
|
|
|
a_list = []
|
|
for handle1 in orig_handle:
|
|
handler = legend.get_legend_handler(handler_map, handle1)
|
|
_a_list = handler.create_artists(
|
|
legend, handle1,
|
|
next(xds_cycle), ydescent, width, height, fontsize, trans)
|
|
a_list.extend(_a_list)
|
|
|
|
return a_list
|
|
|
|
|
|
class HandlerPolyCollection(HandlerBase):
|
|
"""
|
|
Handler for `.PolyCollection` used in `~.Axes.fill_between` and
|
|
`~.Axes.stackplot`.
|
|
"""
|
|
def _update_prop(self, legend_handle, orig_handle):
|
|
def first_color(colors):
|
|
if colors is None:
|
|
return None
|
|
colors = mcolors.to_rgba_array(colors)
|
|
if len(colors):
|
|
return colors[0]
|
|
else:
|
|
return "none"
|
|
|
|
def get_first(prop_array):
|
|
if len(prop_array):
|
|
return prop_array[0]
|
|
else:
|
|
return None
|
|
edgecolor = getattr(orig_handle, '_original_edgecolor',
|
|
orig_handle.get_edgecolor())
|
|
legend_handle.set_edgecolor(first_color(edgecolor))
|
|
facecolor = getattr(orig_handle, '_original_facecolor',
|
|
orig_handle.get_facecolor())
|
|
legend_handle.set_facecolor(first_color(facecolor))
|
|
legend_handle.set_fill(orig_handle.get_fill())
|
|
legend_handle.set_hatch(orig_handle.get_hatch())
|
|
legend_handle.set_linewidth(get_first(orig_handle.get_linewidths()))
|
|
legend_handle.set_linestyle(get_first(orig_handle.get_linestyles()))
|
|
legend_handle.set_transform(get_first(orig_handle.get_transforms()))
|
|
legend_handle.set_figure(orig_handle.get_figure())
|
|
legend_handle.set_alpha(orig_handle.get_alpha())
|
|
|
|
def create_artists(self, legend, orig_handle,
|
|
xdescent, ydescent, width, height, fontsize, trans):
|
|
p = Rectangle(xy=(-xdescent, -ydescent),
|
|
width=width, height=height)
|
|
self.update_prop(p, orig_handle, legend)
|
|
p.set_transform(trans)
|
|
return [p]
|