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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>matplotlib.lines — Matplotlib 3.3.1 documentation</title>

title="Search within Matplotlib 3.3.1 documentation"

href="../../_static/opensearch.xml"/>

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<div id="unreleased-message"> You are reading an old version of the documentation (v3.3.1). For the latest version see <a href="/stable/">https://matplotlib.org/stable/</a> </div>

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<div style="float: left; position: absolute; width: 496px; bottom: 0; padding-bottom: 24px">Version 3.3.1</div>

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<h1>Source code for matplotlib.lines</h1><div class="highlight"><pre>

"""

The 2D line class which can draw with a variety of line styles, markers and

colors.

"""

# TODO: expose cap and join style attrs

from numbers import Integral, Number, Real

import logging

import numpy as np

import matplotlib as mpl

from . import artist, cbook, colors as mcolors, docstring, rcParams

from .artist import Artist, allow_rasterization

from .cbook import (

_to_unmasked_float_array, ls_mapper, ls_mapper_r, STEP_LOOKUP_MAP)

from .markers import MarkerStyle

from .path import Path

from .transforms import (

Affine2D, Bbox, BboxTransformFrom, BboxTransformTo, TransformedPath)

# Imported here for backward compatibility, even though they don't

# really belong.

from . import _path

from .markers import (

CARETLEFT, CARETRIGHT, CARETUP, CARETDOWN,

CARETLEFTBASE, CARETRIGHTBASE, CARETUPBASE, CARETDOWNBASE,

TICKLEFT, TICKRIGHT, TICKUP, TICKDOWN)

_log = logging.getLogger(__name__)

def _get_dash_pattern(style):

"""Convert linestyle to dash pattern."""

# go from short hand -> full strings

if isinstance(style, str):

style = ls_mapper.get(style, style)

# un-dashed styles

if style in ['solid', 'None']:

offset = 0

dashes = None

# dashed styles

elif style in ['dashed', 'dashdot', 'dotted']:

offset = 0

dashes = tuple(rcParams['lines.{}_pattern'.format(style)])

#

elif isinstance(style, tuple):

offset, dashes = style

if offset is None:

cbook.warn_deprecated(

"3.3", message="Passing the dash offset as None is deprecated "

"since %(since)s and support for it will be removed "

"%(removal)s; pass it as zero instead.")

offset = 0

else:

raise ValueError('Unrecognized linestyle: %s' % str(style))

# normalize offset to be positive and shorter than the dash cycle

if dashes is not None:

dsum = sum(dashes)

if dsum:

offset %= dsum

return offset, dashes

def _scale_dashes(offset, dashes, lw):

if not rcParams['lines.scale_dashes']:

return offset, dashes

scaled_offset = offset * lw

scaled_dashes = ([x * lw if x is not None else None for x in dashes]

if dashes is not None else None)

return scaled_offset, scaled_dashes

<div class="viewcode-block" id="segment_hits"><a class="viewcode-back" href="../../api/_as_gen/matplotlib.lines.segment_hits.html#matplotlib.lines.segment_hits">[docs]</a>def segment_hits(cx, cy, x, y, radius):

"""

Return the indices of the segments in the polyline with coordinates (*cx*,

*cy*) that are within a distance *radius* of the point (*x*, *y*).

"""

# Process single points specially

if len(x) <= 1:

res, = np.nonzero((cx - x) ** 2 + (cy - y) ** 2 <= radius ** 2)

return res

# We need to lop the last element off a lot.

xr, yr = x[:-1], y[:-1]

# Only look at line segments whose nearest point to C on the line

# lies within the segment.

dx, dy = x[1:] - xr, y[1:] - yr

Lnorm_sq = dx ** 2 + dy ** 2 # Possibly want to eliminate Lnorm==0

u = ((cx - xr) * dx + (cy - yr) * dy) / Lnorm_sq

candidates = (u >= 0) & (u <= 1)

# Note that there is a little area near one side of each point

# which will be near neither segment, and another which will

# be near both, depending on the angle of the lines. The

# following radius test eliminates these ambiguities.

point_hits = (cx - x) ** 2 + (cy - y) ** 2 <= radius ** 2

candidates = candidates & ~(point_hits[:-1] | point_hits[1:])

# For those candidates which remain, determine how far they lie away

# from the line.

px, py = xr + u * dx, yr + u * dy

line_hits = (cx - px) ** 2 + (cy - py) ** 2 <= radius ** 2

line_hits = line_hits & candidates

points, = point_hits.ravel().nonzero()

lines, = line_hits.ravel().nonzero()

return np.concatenate((points, lines))</div>

def _mark_every_path(markevery, tpath, affine, ax_transform):

"""

Helper function that sorts out how to deal the input

`markevery` and returns the points where markers should be drawn.

Takes in the `markevery` value and the line path and returns the

sub-sampled path.

"""

# pull out the two bits of data we want from the path

codes, verts = tpath.codes, tpath.vertices

def _slice_or_none(in_v, slc):

"""Helper function to cope with `codes` being an ndarray or `None`."""

if in_v is None:

return None

return in_v[slc]

# if just an int, assume starting at 0 and make a tuple

if isinstance(markevery, Integral):

markevery = (0, markevery)

# if just a float, assume starting at 0.0 and make a tuple

elif isinstance(markevery, Real):

markevery = (0.0, markevery)

if isinstance(markevery, tuple):

if len(markevery) != 2:

raise ValueError('`markevery` is a tuple but its len is not 2; '

'markevery={}'.format(markevery))

start, step = markevery

# if step is an int, old behavior

if isinstance(step, Integral):

# tuple of 2 int is for backwards compatibility,

if not isinstance(start, Integral):

raise ValueError(

'`markevery` is a tuple with len 2 and second element is '

'an int, but the first element is not an int; markevery={}'

.format(markevery))

# just return, we are done here

return Path(verts[slice(start, None, step)],

_slice_or_none(codes, slice(start, None, step)))

elif isinstance(step, Real):

raise ValueError(

'`markevery` is a tuple with len 2 and second element is '

'a float, but the first element is not a float or an int; '

# calc cumulative distance along path (in display coords):

disp_coords = affine.transform(tpath.vertices)

delta = np.empty((len(disp_coords), 2))

delta[0, :] = 0

delta[1:, :] = disp_coords[1:, :] - disp_coords[:-1, :]

delta = np.hypot(*delta.T).cumsum()

# calc distance between markers along path based on the axes

# bounding box diagonal being a distance of unity:

(x0, y0), (x1, y1) = ax_transform.transform([[0, 0], [1, 1]])

scale = np.hypot(x1 - x0, y1 - y0)

marker_delta = np.arange(start * scale, delta[-1], step * scale)

# find closest actual data point that is closest to

# the theoretical distance along the path:

inds = np.abs(delta[np.newaxis, :] - marker_delta[:, np.newaxis])

inds = inds.argmin(axis=1)

inds = np.unique(inds)

# return, we are done here

return Path(verts[inds], _slice_or_none(codes, inds))

else:

raise ValueError(

f"markevery={markevery!r} is a tuple with len 2, but its "

f"second element is not an int or a float")

elif isinstance(markevery, slice):

# mazol tov, it's already a slice, just return

return Path(verts[markevery], _slice_or_none(codes, markevery))

elif np.iterable(markevery):

# fancy indexing

try:

except (ValueError, IndexError) as err:

raise ValueError(

f"fancy index") from err

else:

raise ValueError(f"markevery={markevery!r} is not a recognized value")

@cbook._define_aliases({

"antialiased": ["aa"],

"color": ["c"],

"drawstyle": ["ds"],

"linestyle": ["ls"],

"linewidth": ["lw"],

"markeredgecolor": ["mec"],

"markeredgewidth": ["mew"],

"markerfacecolor": ["mfc"],

"markerfacecoloralt": ["mfcalt"],

"markersize": ["ms"],

})

class Line2D(Artist):

"""

A line - the line can have both a solid linestyle connecting all

the vertices, and a marker at each vertex. Additionally, the

drawing of the solid line is influenced by the drawstyle, e.g., one

can create "stepped" lines in various styles.

"""

lineStyles = _lineStyles = { # hidden names deprecated

'-': '_draw_solid',

'--': '_draw_dashed',

'-.': '_draw_dash_dot',

':': '_draw_dotted',

'None': '_draw_nothing',

' ': '_draw_nothing',

'': '_draw_nothing',

}

_drawStyles_l = {

'default': '_draw_lines',

'steps-mid': '_draw_steps_mid',

'steps-pre': '_draw_steps_pre',

'steps-post': '_draw_steps_post',

}

_drawStyles_s = {

'steps': '_draw_steps_pre',

}

# drawStyles should now be deprecated.

drawStyles = {**_drawStyles_l, **_drawStyles_s}

# Need a list ordered with long names first:

drawStyleKeys = [*_drawStyles_l, *_drawStyles_s]

# Referenced here to maintain API. These are defined in

# MarkerStyle

markers = MarkerStyle.markers

filled_markers = MarkerStyle.filled_markers

fillStyles = MarkerStyle.fillstyles

zorder = 2

validCap = ('butt', 'round', 'projecting')

validJoin = ('miter', 'round', 'bevel')

def __str__(self):

if self._label != "":

return f"Line2D({self._label})"

elif self._x is None:

return "Line2D()"

elif len(self._x) > 3:

return "Line2D((%g,%g),(%g,%g),...,(%g,%g))" % (

self._x[0], self._y[0], self._x[0],

self._y[0], self._x[-1], self._y[-1])

else:

return "Line2D(%s)" % ",".join(

map("({:g},{:g})".format, self._x, self._y))

def __init__(self, xdata, ydata,

linewidth=None, # all Nones default to rc

linestyle=None,

color=None,

marker=None,

markersize=None,

markeredgewidth=None,

markeredgecolor=None,

markerfacecolor=None,

markerfacecoloralt='none',

fillstyle=None,

antialiased=None,

dash_capstyle=None,

solid_capstyle=None,

dash_joinstyle=None,

solid_joinstyle=None,

pickradius=5,

drawstyle=None,

markevery=None,

**kwargs

):

"""

Create a `.Line2D` instance with *x* and *y* data in sequences of

*xdata*, *ydata*.

Additional keyword arguments are `.Line2D` properties:

%(_Line2D_docstr)s

See :meth:`set_linestyle` for a description of the line styles,

:meth:`set_marker` for a description of the markers, and

:meth:`set_drawstyle` for a description of the draw styles.

"""

Artist.__init__(self)

#convert sequences to numpy arrays

if not np.iterable(xdata):

raise RuntimeError('xdata must be a sequence')

raise RuntimeError('ydata must be a sequence')

if linewidth is None:

linewidth = rcParams['lines.linewidth']

if linestyle is None:

linestyle = rcParams['lines.linestyle']

if marker is None:

marker = rcParams['lines.marker']

if markerfacecolor is None:

markerfacecolor = rcParams['lines.markerfacecolor']

if markeredgecolor is None:

markeredgecolor = rcParams['lines.markeredgecolor']

if color is None:

color = rcParams['lines.color']

if markersize is None:

markersize = rcParams['lines.markersize']

if antialiased is None:

antialiased = rcParams['lines.antialiased']

if dash_capstyle is None:

dash_capstyle = rcParams['lines.dash_capstyle']

if dash_joinstyle is None:

dash_joinstyle = rcParams['lines.dash_joinstyle']

if solid_capstyle is None:

solid_capstyle = rcParams['lines.solid_capstyle']

if solid_joinstyle is None:

solid_joinstyle = rcParams['lines.solid_joinstyle']

if drawstyle is None:

drawstyle = 'default'

self._dashcapstyle = None

self._dashjoinstyle = None

self._solidjoinstyle = None

self._solidcapstyle = None

self.set_dash_capstyle(dash_capstyle)

self.set_dash_joinstyle(dash_joinstyle)

self.set_solid_capstyle(solid_capstyle)

self.set_solid_joinstyle(solid_joinstyle)

self._linestyles = None

self._drawstyle = None

self._linewidth = linewidth

# scaled dash + offset

self._dashSeq = None

self._dashOffset = 0

# unscaled dash + offset

# this is needed scaling the dash pattern by linewidth

self._us_dashSeq = None

self._us_dashOffset = 0

self.set_linewidth(linewidth)

self.set_linestyle(linestyle)

self.set_drawstyle(drawstyle)

self._color = None

self.set_color(color)

self._marker = MarkerStyle(marker, fillstyle)

self._markevery = None

self._markersize = None

self._antialiased = None

self.set_markevery(markevery)

self.set_antialiased(antialiased)

self.set_markersize(markersize)

self._markeredgecolor = None

self._markeredgewidth = None

self._markerfacecolor = None

self._markerfacecoloralt = None

self.set_markerfacecolor(markerfacecolor)

self.set_markerfacecoloralt(markerfacecoloralt)

self.set_markeredgecolor(markeredgecolor)

self.set_markeredgewidth(markeredgewidth)

# update kwargs before updating data to give the caller a

# chance to init axes (and hence unit support)

self.update(kwargs)

self.pickradius = pickradius

self.ind_offset = 0

self._xorig = np.asarray([])

self._yorig = np.asarray([])

self._invalidx = True

self._invalidy = True

self._x = None

self._y = None

self._xy = None

self._path = None

self._transformed_path = None

self._subslice = False

self._x_filled = None # used in subslicing; only x is needed

self.set_data(xdata, ydata)

def contains(self, mouseevent):

"""

Test whether *mouseevent* occurred on the line.

An event is deemed to have occurred "on" the line if it is less

than ``self.pickradius`` (default: 5 points) away from it. Use

`~.Line2D.get_pickradius` or `~.Line2D.set_pickradius` to get or set

the pick radius.

Parameters

----------

mouseevent : `matplotlib.backend_bases.MouseEvent`

Returns

-------

contains : bool

Whether any values are within the radius.

details : dict

A dictionary ``{'ind': pointlist}``, where *pointlist* is a

list of points of the line that are within the pickradius around

the event position.

TODO: sort returned indices by distance

"""

inside, info = self._default_contains(mouseevent)

if inside is not None:

return inside, info

# Make sure we have data to plot

if self._invalidy or self._invalidx:

self.recache()

if len(self._xy) == 0:

return False, {}

# Convert points to pixels

transformed_path = self._get_transformed_path()

path, affine = transformed_path.get_transformed_path_and_affine()

path = affine.transform_path(path)

xy = path.vertices

xt = xy[:, 0]

yt = xy[:, 1]

# Convert pick radius from points to pixels

if self.figure is None:

_log.warning('no figure set when check if mouse is on line')

pixels = self.pickradius

else:

pixels = self.figure.dpi / 72. * self.pickradius

# The math involved in checking for containment (here and inside of

# segment_hits) assumes that it is OK to overflow, so temporarily set

# the error flags accordingly.

with np.errstate(all='ignore'):

# Check for collision

if self._linestyle in ['None', None]:

# If no line, return the nearby point(s)

ind, = np.nonzero(

(xt - mouseevent.x) ** 2 + (yt - mouseevent.y) ** 2

<= pixels ** 2)

else:

# If line, return the nearby segment(s)

ind = segment_hits(mouseevent.x, mouseevent.y, xt, yt, pixels)

if self._drawstyle.startswith("steps"):

ind //= 2

ind += self.ind_offset

# Return the point(s) within radius

return len(ind) > 0, dict(ind=ind)

def get_pickradius(self):

"""

Return the pick radius used for containment tests.

See `.contains` for more details.

"""

return self._pickradius

def set_pickradius(self, d):

"""

Set the pick radius used for containment tests.

See `.contains` for more details.

Parameters

----------

d : float

Pick radius, in points.

"""

if not isinstance(d, Number) or d < 0:

raise ValueError("pick radius should be a distance")

self._pickradius = d

pickradius = property(get_pickradius, set_pickradius)

def get_fillstyle(self):

"""

Return the marker fill style.

See also `~.Line2D.set_fillstyle`.

"""

return self._marker.get_fillstyle()

def set_fillstyle(self, fs):

"""

Set the marker fill style.

Parameters

----------

fs : {'full', 'left', 'right', 'bottom', 'top', 'none'}

Possible values:

- 'full': Fill the whole marker with the *markerfacecolor*.

- 'left', 'right', 'bottom', 'top': Fill the marker half at

the given side with the *markerfacecolor*. The other

half of the marker is filled with *markerfacecoloralt*.

- 'none': No filling.

For examples see :ref:`marker_fill_styles`.

"""

self._marker.set_fillstyle(fs)

self.stale = True

def set_markevery(self, every):

"""

Set the markevery property to subsample the plot when using markers.

e.g., if ``every=5``, every 5-th marker will be plotted.

Parameters

----------

every : None or int or (int, int) or slice or List[int] or float or \

(float, float) or List[bool]

Which markers to plot.

- every=None, every point will be plotted.

- every=N, every N-th marker will be plotted starting with

marker 0.

- every=(start, N), every N-th marker, starting at point

start, will be plotted.

- every=slice(start, end, N), every N-th marker, starting at

point start, up to but not including point end, will be plotted.

- every=[i, j, m, n], only markers at points i, j, m, and n

will be plotted.

- every=[True, False, True], positions that are True will be

plotted.

- every=0.1, (i.e. a float) then markers will be spaced at

approximately equal distances along the line; the distance

along the line between markers is determined by multiplying the

display-coordinate distance of the axes bounding-box diagonal

by the value of every.

- every=(0.5, 0.1) (i.e. a length-2 tuple of float), the same

functionality as every=0.1 is exhibited but the first marker will

be 0.5 multiplied by the display-coordinate-diagonal-distance

along the line.

For examples see

:doc:`/gallery/lines_bars_and_markers/markevery_demo`.

Notes

-----

Setting the markevery property will only show markers at actual data

points. When using float arguments to set the markevery property

on irregularly spaced data, the markers will likely not appear evenly

spaced because the actual data points do not coincide with the

theoretical spacing between markers.

When using a start offset to specify the first marker, the offset will

be from the first data point which may be different from the first

the visible data point if the plot is zoomed in.

If zooming in on a plot when using float arguments then the actual

data points that have markers will change because the distance between

markers is always determined from the display-coordinates

axes-bounding-box-diagonal regardless of the actual axes data limits.

"""

self._markevery = every

self.stale = True

def get_markevery(self):

"""

Return the markevery setting for marker subsampling.

See also `~.Line2D.set_markevery`.

"""

return self._markevery

def set_picker(self, p):

# docstring inherited

if isinstance(p, Number) and not isinstance(p, bool):

# After deprecation, the whole method can be deleted and inherited.

cbook.warn_deprecated(

"3.3", message="Setting the line's pick radius via set_picker "

"is deprecated since %(since)s and will be removed "

"%(removal)s; use set_pickradius instead.")

self.pickradius = p

self._picker = p

def get_window_extent(self, renderer):

bbox = Bbox([[0, 0], [0, 0]])

trans_data_to_xy = self.get_transform().transform

bbox.update_from_data_xy(trans_data_to_xy(self.get_xydata()),

ignore=True)

# correct for marker size, if any

if self._marker:

ms = (self._markersize / 72.0 * self.figure.dpi) * 0.5

bbox = bbox.padded(ms)

return bbox

@Artist.axes.setter

def axes(self, ax):

# call the set method from the base-class property

Artist.axes.fset(self, ax)

if ax is not None:

# connect unit-related callbacks

if ax.xaxis is not None:

self._xcid = ax.xaxis.callbacks.connect('units',

self.recache_always)

if ax.yaxis is not None:

self._ycid = ax.yaxis.callbacks.connect('units',

self.recache_always)

def set_data(self, *args):

"""

Set the x and y data.

Parameters

----------

*args : (2, N) array or two 1D arrays

"""

if len(args) == 1:

(x, y), = args

else:

x, y = args

self.set_xdata(x)

self.set_ydata(y)

def recache_always(self):

self.recache(always=True)

def recache(self, always=False):

if always or self._invalidx:

xconv = self.convert_xunits(self._xorig)

x = _to_unmasked_float_array(xconv).ravel()

else:

x = self._x

if always or self._invalidy:

yconv = self.convert_yunits(self._yorig)

y = _to_unmasked_float_array(yconv).ravel()

else:

y = self._y

self._xy = np.column_stack(np.broadcast_arrays(x, y)).astype(float)

self._x, self._y = self._xy.T # views

self._subslice = False

if (self.axes and len(x) > 1000 and self._is_sorted(x) and

self.axes.name == 'rectilinear' and

self.axes.get_xscale() == 'linear' and

self._markevery is None and

self.get_clip_on()):

self._subslice = True

nanmask = np.isnan(x)

if nanmask.any():

self._x_filled = self._x.copy()

indices = np.arange(len(x))

self._x_filled[nanmask] = np.interp(

indices[nanmask], indices[~nanmask], self._x[~nanmask])

else:

self._x_filled = self._x

if self._path is not None:

interpolation_steps = self._path._interpolation_steps

else:

interpolation_steps = 1

xy = STEP_LOOKUP_MAP[self._drawstyle](*self._xy.T)

self._path = Path(np.asarray(xy).T,

_interpolation_steps=interpolation_steps)

self._transformed_path = None

self._invalidx = False

self._invalidy = False

def _transform_path(self, subslice=None):

"""

Puts a TransformedPath instance at self._transformed_path;

all invalidation of the transform is then handled by the

TransformedPath instance.

"""

# Masked arrays are now handled by the Path class itself

if subslice is not None:

xy = STEP_LOOKUP_MAP[self._drawstyle](*self._xy[subslice, :].T)

_path = Path(np.asarray(xy).T,

_interpolation_steps=self._path._interpolation_steps)

else:

_path = self._path

self._transformed_path = TransformedPath(_path, self.get_transform())

def _get_transformed_path(self):

"""

Return the :class:`~matplotlib.transforms.TransformedPath` instance

of this line.

"""

if self._transformed_path is None:

self._transform_path()

return self._transformed_path

def set_transform(self, t):

"""

Set the Transformation instance used by this artist.

Parameters

----------

t : `matplotlib.transforms.Transform`

"""

Artist.set_transform(self, t)

self._invalidx = True

self._invalidy = True

self.stale = True

def _is_sorted(self, x):

"""Return whether x is sorted in ascending order."""

# We don't handle the monotonically decreasing case.

return _path.is_sorted(x)

@allow_rasterization

def draw(self, renderer):

# docstring inherited

if not self.get_visible():

return

self.recache()

self.ind_offset = 0 # Needed for contains() method.

if self._subslice and self.axes:

x0, x1 = self.axes.get_xbound()

i0 = self._x_filled.searchsorted(x0, 'left')

i1 = self._x_filled.searchsorted(x1, 'right')

subslice = slice(max(i0 - 1, 0), i1 + 1)

self.ind_offset = subslice.start

self._transform_path(subslice)

else:

subslice = None

if self.get_path_effects():

from matplotlib.patheffects import PathEffectRenderer

renderer = PathEffectRenderer(self.get_path_effects(), renderer)

renderer.open_group('line2d', self.get_gid())

if self._lineStyles[self._linestyle] != '_draw_nothing':

tpath, affine = (self._get_transformed_path()

.get_transformed_path_and_affine())

if len(tpath.vertices):

gc = renderer.new_gc()

self._set_gc_clip(gc)

gc.set_url(self.get_url())

lc_rgba = mcolors.to_rgba(self._color, self._alpha)

gc.set_foreground(lc_rgba, isRGBA=True)

gc.set_antialiased(self._antialiased)

gc.set_linewidth(self._linewidth)

if self.is_dashed():

cap = self._dashcapstyle

join = self._dashjoinstyle

else:

cap = self._solidcapstyle

join = self._solidjoinstyle

gc.set_joinstyle(join)

gc.set_capstyle(cap)

gc.set_snap(self.get_snap())

if self.get_sketch_params() is not None:

gc.set_sketch_params(*self.get_sketch_params())

gc.set_dashes(self._dashOffset, self._dashSeq)

renderer.draw_path(gc, tpath, affine.frozen())

gc.restore()

if self._marker and self._markersize > 0:

gc = renderer.new_gc()

self._set_gc_clip(gc)

ec_rgba = mcolors.to_rgba(

self.get_markeredgecolor(), self._alpha)

fc_rgba = mcolors.to_rgba(

self._get_markerfacecolor(), self._alpha)

fcalt_rgba = mcolors.to_rgba(

self._get_markerfacecolor(alt=True), self._alpha)

# If the edgecolor is "auto", it is set according to the *line*

# color but inherits the alpha value of the *face* color, if any.

if (cbook._str_equal(self._markeredgecolor, "auto")

and not cbook._str_lower_equal(

self.get_markerfacecolor(), "none")):

ec_rgba = ec_rgba[:3] + (fc_rgba[3],)

gc.set_foreground(ec_rgba, isRGBA=True)

scale, length, randomness = self.get_sketch_params()

gc.set_sketch_params(scale/2, length/2, 2*randomness)

marker = self._marker

# Markers *must* be drawn ignoring the drawstyle (but don't pay the

# recaching if drawstyle is already "default").

if self.get_drawstyle() != "default":

with cbook._setattr_cm(

self, _drawstyle="default", _transformed_path=None):

self.recache()

self._transform_path(subslice)

.get_transformed_points_and_affine())

else:

.get_transformed_points_and_affine())

if len(tpath.vertices):

# subsample the markers if markevery is not None

markevery = self.get_markevery()

if markevery is not None:

subsampled = _mark_every_path(markevery, tpath,

affine, self.axes.transAxes)

else:

subsampled = tpath

snap = marker.get_snap_threshold()

if isinstance(snap, Real):

snap = renderer.points_to_pixels(self._markersize) >= snap

gc.set_snap(snap)

gc.set_joinstyle(marker.get_joinstyle())

gc.set_capstyle(marker.get_capstyle())

marker_path = marker.get_path()

marker_trans = marker.get_transform()

w = renderer.points_to_pixels(self._markersize)

if cbook._str_equal(marker.get_marker(), ","):

gc.set_linewidth(0)

else:

# Don't scale for pixels, and don't stroke them

marker_trans = marker_trans.scale(w)

renderer.draw_markers(gc, marker_path, marker_trans,

subsampled, affine.frozen(),

fc_rgba)

alt_marker_path = marker.get_alt_path()

if alt_marker_path:

alt_marker_trans = marker.get_alt_transform()

alt_marker_trans = alt_marker_trans.scale(w)

renderer.draw_markers(

gc, alt_marker_path, alt_marker_trans, subsampled,

affine.frozen(), fcalt_rgba)

gc.restore()

renderer.close_group('line2d')

self.stale = False

def get_antialiased(self):

"""Return whether antialiased rendering is used."""

return self._antialiased

def get_color(self):

"""

Return the line color.

See also `~.Line2D.set_color`.

"""

return self._color

def get_drawstyle(self):

"""

Return the drawstyle.

See also `~.Line2D.set_drawstyle`.

"""

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