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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.artist — Matplotlib 3.2.0 documentation</title>

title="Search within Matplotlib 3.2.0 documentation"

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

</head><body>

<div id="unreleased-message"> You are reading an old version of the documentation (v3.2.0). For the latest version see <a href="/stable/">https://matplotlib.org/stable/</a> </div>

<div style="float: left; position: absolute; width: 496px; bottom: 0; padding-bottom: 24px">Version 3.2.0</div>

<div id="forkongithub"><a href="https://github.com/matplotlib/matplotlib">Fork me on GitHub</a></div>

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<ul>

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</div>

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

from collections import OrderedDict, namedtuple

from functools import wraps

import inspect

import logging

from numbers import Number

import re

import warnings

import numpy as np

import matplotlib

from . import cbook, docstring, rcParams

from .path import Path

from .transforms import (Bbox, IdentityTransform, Transform, TransformedBbox,

TransformedPatchPath, TransformedPath)

_log = logging.getLogger(__name__)

def allow_rasterization(draw):

"""

Decorator for Artist.draw method. Provides routines

that run before and after the draw call. The before and after functions

are useful for changing artist-dependent renderer attributes or making

other setup function calls, such as starting and flushing a mixed-mode

renderer.

"""

# the axes class has a second argument inframe for its draw method.

@wraps(draw)

def draw_wrapper(artist, renderer, *args, **kwargs):

try:

if artist.get_rasterized():

renderer.start_rasterizing()

if artist.get_agg_filter() is not None:

renderer.start_filter()

return draw(artist, renderer, *args, **kwargs)

finally:

renderer.stop_filter(artist.get_agg_filter())

if artist.get_rasterized():

renderer.stop_rasterizing()

draw_wrapper._supports_rasterization = True

return draw_wrapper

def _stale_axes_callback(self, val):

if self.axes:

self.axes.stale = val

_XYPair = namedtuple("_XYPair", "x y")

<div class="viewcode-block" id="Artist"><a class="viewcode-back" href="../../api/artist_api.html#matplotlib.axes.Artist">[docs]</a>class Artist:

"""

Abstract base class for objects that render into a FigureCanvas.

Typically, all visible elements in a figure are subclasses of Artist.

"""

@cbook.deprecated("3.1")

@property

def aname(self):

return 'Artist'

zorder = 0

# order of precedence when bulk setting/updating properties

# via update. The keys should be property names and the values

# integers

_prop_order = dict(color=-1)

def __init__(self):

self._stale = True

self.stale_callback = None

self._axes = None

self.figure = None

self._transform = None

self._transformSet = False

self._visible = True

self._animated = False

self._alpha = None

self.clipbox = None

self._clippath = None

self._clipon = True

self._label = ''

self._picker = None

self._contains = None

self._rasterized = None

self._agg_filter = None

self._mouseover = False

self.eventson = False # fire events only if eventson

self._oid = 0 # an observer id

self._propobservers = {} # a dict from oids to funcs

try:

self.axes = None

except AttributeError:

# Handle self.axes as a read-only property, as in Figure.

pass

self._remove_method = None

self._url = None

self._gid = None

self._snap = None

self._sketch = rcParams['path.sketch']

self._path_effects = rcParams['path.effects']

self._sticky_edges = _XYPair([], [])

self._in_layout = True

def __getstate__(self):

d = self.__dict__.copy()

# remove the unpicklable remove method, this will get re-added on load

# (by the axes) if the artist lives on an axes.

d['stale_callback'] = None

return d

def remove(self):

"""

Remove the artist from the figure if possible.

The effect will not be visible until the figure is redrawn, e.g.,

with `.FigureCanvasBase.draw_idle`. Call `~.axes.Axes.relim` to

update the axes limits if desired.

Note: `~.axes.Axes.relim` will not see collections even if the

collection was added to the axes with *autolim* = True.

Note: there is no support for removing the artist's legend entry.

"""

# There is no method to set the callback. Instead the parent should

# set the _remove_method attribute directly. This would be a

# protected attribute if Python supported that sort of thing. The

# callback has one parameter, which is the child to be removed.

if self._remove_method is not None:

self._remove_method(self)

# clear stale callback

self.stale_callback = None

_ax_flag = False

if hasattr(self, 'axes') and self.axes:

# remove from the mouse hit list

self.axes._mouseover_set.discard(self)

# mark the axes as stale

self.axes.stale = True

# decouple the artist from the axes

self.axes = None

_ax_flag = True

if self.figure:

self.figure = None

if not _ax_flag:

self.figure = True

else:

raise NotImplementedError('cannot remove artist')

# TODO: the fix for the collections relim problem is to move the

# limits calculation into the artist itself, including the property of

# whether or not the artist should affect the limits. Then there will

# be no distinction between axes.add_line, axes.add_patch, etc.

# TODO: add legend support

def have_units(self):

"""Return *True* if units are set on any axis."""

ax = self.axes

return ax and any(axis.have_units() for axis in ax._get_axis_list())

def convert_xunits(self, x):

"""

Convert *x* using the unit type of the xaxis.

If the artist is not in contained in an Axes or if the xaxis does not

have units, *x* itself is returned.

"""

ax = getattr(self, 'axes', None)

if ax is None or ax.xaxis is None:

return x

return ax.xaxis.convert_units(x)

def convert_yunits(self, y):

"""

Convert *y* using the unit type of the yaxis.

If the artist is not in contained in an Axes or if the yaxis does not

have units, *y* itself is returned.

"""

if ax is None or ax.yaxis is None:

return y

return ax.yaxis.convert_units(y)

@property

def axes(self):

"""The `~.axes.Axes` instance the artist resides in, or *None*."""

return self._axes

@axes.setter

def axes(self, new_axes):

if (new_axes is not None and self._axes is not None

and new_axes != self._axes):

raise ValueError("Can not reset the axes. You are probably "

"trying to re-use an artist in more than one "

"Axes which is not supported")

self._axes = new_axes

if new_axes is not None and new_axes is not self:

self.stale_callback = _stale_axes_callback

return new_axes

@property

def stale(self):

"""

Whether the artist is 'stale' and needs to be re-drawn for the output

to match the internal state of the artist.

"""

return self._stale

@stale.setter

def stale(self, val):

self._stale = val

# if the artist is animated it does not take normal part in the

# draw stack and is not expected to be drawn as part of the normal

# draw loop (when not saving) so do not propagate this change

if self.get_animated():

return

if val and self.stale_callback is not None:

self.stale_callback(self, val)

def get_window_extent(self, renderer):

"""

Get the axes bounding box in display space.

The bounding box' width and height are nonnegative.

Subclasses should override for inclusion in the bounding box

"tight" calculation. Default is to return an empty bounding

box at 0, 0.

Be careful when using this function, the results will not update

if the artist window extent of the artist changes. The extent

can change due to any changes in the transform stack, such as

changing the axes limits, the figure size, or the canvas used

(as is done when saving a figure). This can lead to unexpected

behavior where interactive figures will look fine on the screen,

but will save incorrectly.

"""

return Bbox([[0, 0], [0, 0]])

def _get_clipping_extent_bbox(self):

"""

Return a bbox with the extents of the intersection of the clip_path

and clip_box for this artist, or None if both of these are

None, or ``get_clip_on`` is False.

"""

bbox = None

if self.get_clip_on():

clip_box = self.get_clip_box()

if clip_box is not None:

bbox = clip_box

clip_path = self.get_clip_path()

if clip_path is not None and bbox is not None:

clip_path = clip_path.get_fully_transformed_path()

bbox = Bbox.intersection(bbox, clip_path.get_extents())

return bbox

def get_tightbbox(self, renderer):

"""

Like `Artist.get_window_extent`, but includes any clipping.

Parameters

----------

renderer : `.RendererBase` instance

renderer that will be used to draw the figures (i.e.

``fig.canvas.get_renderer()``)

Returns

-------

bbox : `.Bbox`

The enclosing bounding box (in figure pixel co-ordinates).

"""

bbox = self.get_window_extent(renderer)

if self.get_clip_on():

clip_box = self.get_clip_box()

if clip_box is not None:

clip_path = self.get_clip_path()

clip_path = clip_path.get_fully_transformed_path()

return bbox

def add_callback(self, func):

"""

Add a callback function that will be called whenever one of the

`.Artist`'s properties changes.

Parameters

----------

func : callable

The callback function. It must have the signature::

def func(artist: Artist) -> Any

where *artist* is the calling `.Artist`. Return values may exist

but are ignored.

Returns

-------

oid : int

The observer id associated with the callback. This id can be

used for removing the callback with `.remove_callback` later.

See Also

--------

remove_callback

"""

oid = self._oid

self._propobservers[oid] = func

self._oid += 1

return oid

def remove_callback(self, oid):

"""

Remove a callback based on its observer id.

See Also

--------

add_callback

"""

try:

del self._propobservers[oid]

except KeyError:

pass

def pchanged(self):

"""

Call all of the registered callbacks.

This function is triggered internally when a property is changed.

See Also

--------

add_callback

remove_callback

"""

for oid, func in self._propobservers.items():

func(self)

def is_transform_set(self):

"""

Return whether the Artist has an explicitly set transform.

This is *True* after `.set_transform` has been called.

"""

return self._transformSet

def set_transform(self, t):

"""

Set the artist transform.

Parameters

----------

t : `.Transform`

"""

self._transform = t

self._transformSet = True

self.pchanged()

self.stale = True

def get_transform(self):

"""Return the `.Transform` instance used by this artist."""

if self._transform is None:

self._transform = IdentityTransform()

elif (not isinstance(self._transform, Transform)

and hasattr(self._transform, '_as_mpl_transform')):

self._transform = self._transform._as_mpl_transform(self.axes)

return self._transform

def get_children(self):

r"""Return a list of the child `.Artist`\s of this `.Artist`."""

return []

def _default_contains(self, mouseevent, figure=None):

"""

Base impl. for checking whether a mouseevent happened in an artist.

1. If the artist defines a custom checker, use it.

2. If the artist figure is known and the event did not occur in that

figure (by checking its ``canvas`` attribute), reject it.

3. Otherwise, return `None, {}`, indicating that the subclass'

implementation should be used.

Subclasses should start their definition of `contains` as follows:

inside, info = self._default_contains(mouseevent)

if inside is not None:

return inside, info

# subclass-specific implementation follows

The `canvas` kwarg is provided for the implementation of

`Figure.contains`.

"""

if callable(self._contains):

return self._contains(self, mouseevent)

if figure is not None and mouseevent.canvas is not figure.canvas:

return False, {}

return None, {}

def contains(self, mouseevent):

"""Test whether the artist contains the mouse event.

Parameters

----------

mouseevent : `matplotlib.backend_bases.MouseEvent`

Returns

-------

contains : bool

Whether any values are within the radius.

details : dict

An artist-specific dictionary of details of the event context,

such as which points are contained in the pick radius. See the

individual Artist subclasses for details.

See Also

--------

set_contains, get_contains

"""

inside, info = self._default_contains(mouseevent)

if inside is not None:

return inside, info

_log.warning("%r needs 'contains' method", self.__class__.__name__)

return False, {}

def set_contains(self, picker):

"""

Define a custom contains test for the artist.

The provided callable replaces the default `.contains` method

of the artist.

Parameters

----------

picker : callable

A custom picker function to evaluate if an event is within the

artist. The function must have the signature::

def contains(artist: Artist, event: MouseEvent) -> bool, dict

that returns:

- a bool indicating if the event is within the artist

- a dict of additional information. The dict should at least

return the same information as the default ``contains()``

implementation of the respective artist, but may provide

additional information.

"""

if not callable(picker):

raise TypeError("picker is not a callable")

self._contains = picker

def get_contains(self):

"""

Return the custom contains function of the artist if set, or *None*.

See Also

--------

set_contains

"""

return self._contains

def pickable(self):

"""

Return whether the artist is pickable.

See Also

--------

set_picker, get_picker, pick

"""

return self.figure is not None and self._picker is not None

def pick(self, mouseevent):

"""

Process a pick event.

Each child artist will fire a pick event if *mouseevent* is over

the artist and the artist has picker set.

See Also

--------

set_picker, get_picker, pickable

"""

# Pick self

if self.pickable():

picker = self.get_picker()

if callable(picker):

inside, prop = picker(self, mouseevent)

else:

inside, prop = self.contains(mouseevent)

if inside:

self.figure.canvas.pick_event(mouseevent, self, **prop)

# Pick children

for a in self.get_children():

# make sure the event happened in the same axes

ax = getattr(a, 'axes', None)

if (mouseevent.inaxes is None or ax is None

or mouseevent.inaxes == ax):

# we need to check if mouseevent.inaxes is None

# because some objects associated with an axes (e.g., a

# tick label) can be outside the bounding box of the

# axes and inaxes will be None

# also check that ax is None so that it traverse objects

# which do no have an axes property but children might

a.pick(mouseevent)

def set_picker(self, picker):

"""

Define the picking behavior of the artist.

Parameters

----------

picker : None or bool or float or callable

This can be one of the following:

- *None*: Picking is disabled for this artist (default).

- A boolean: If *True* then picking will be enabled and the

artist will fire a pick event if the mouse event is over

the artist.

- A float: If picker is a number it is interpreted as an

epsilon tolerance in points and the artist will fire

off an event if it's data is within epsilon of the mouse

event. For some artists like lines and patch collections,

the artist may provide additional data to the pick event

that is generated, e.g., the indices of the data within

epsilon of the pick event

- A function: If picker is callable, it is a user supplied

function which determines whether the artist is hit by the

mouse event::

hit, props = picker(artist, mouseevent)

to determine the hit test. if the mouse event is over the

artist, return *hit=True* and props is a dictionary of

properties you want added to the PickEvent attributes.

"""

self._picker = picker

def get_picker(self):

"""

Return the picking behavior of the artist.

The possible values are described in `.set_picker`.

See Also

--------

set_picker, pickable, pick

"""

return self._picker

def get_url(self):

"""Return the url."""

return self._url

def set_url(self, url):

"""

Set the url for the artist.

Parameters

----------

url : str

"""

self._url = url

def get_gid(self):

"""Return the group id."""

return self._gid

def set_gid(self, gid):

"""

Set the (group) id for the artist.

Parameters

----------

gid : str

"""

self._gid = gid

def get_snap(self):

"""

Returns the snap setting.

See `.set_snap` for details.

"""

if rcParams['path.snap']:

return self._snap

else:

return False

def set_snap(self, snap):

"""

Set the snapping behavior.

Snapping aligns positions with the pixel grid, which results in

clearer images. For example, if a black line of 1px width was

defined at a position in between two pixels, the resulting image

would contain the interpolated value of that line in the pixel grid,

which would be a grey value on both adjacent pixel positions. In

contrast, snapping will move the line to the nearest integer pixel

value, so that the resulting image will really contain a 1px wide

black line.

Snapping is currently only supported by the Agg and MacOSX backends.

Parameters

----------

snap : bool or None

Possible values:

- *True*: Snap vertices to the nearest pixel center.

- *False*: Do not modify vertex positions.

- *None*: (auto) If the path contains only rectilinear line

segments, round to the nearest pixel center.

"""

self._snap = snap

self.stale = True

def get_sketch_params(self):

"""

Returns the sketch parameters for the artist.

Returns

-------

sketch_params : tuple or None

A 3-tuple with the following elements:

- *scale*: The amplitude of the wiggle perpendicular to the

source line.

- *length*: The length of the wiggle along the line.

- *randomness*: The scale factor by which the length is

shrunken or expanded.

Returns *None* if no sketch parameters were set.

"""

return self._sketch

def set_sketch_params(self, scale=None, length=None, randomness=None):

"""

Sets the sketch parameters.

Parameters

----------

scale : float, optional

The amplitude of the wiggle perpendicular to the source

line, in pixels. If scale is `None`, or not provided, no

sketch filter will be provided.

length : float, optional

The length of the wiggle along the line, in pixels

(default 128.0)

randomness : float, optional

The scale factor by which the length is shrunken or

expanded (default 16.0)

.. ACCEPTS: (scale: float, length: float, randomness: float)

"""

if scale is None:

self._sketch = None

else:

self._sketch = (scale, length or 128.0, randomness or 16.0)

self.stale = True

def set_path_effects(self, path_effects):

"""Set the path effects.

Parameters

----------

path_effects : `.AbstractPathEffect`

"""

self._path_effects = path_effects

self.stale = True

def get_path_effects(self):

return self._path_effects

def get_figure(self):

"""Return the `.Figure` instance the artist belongs to."""

return self.figure

def set_figure(self, fig):

"""

Set the `.Figure` instance the artist belongs to.

Parameters

----------

fig : `.Figure`

"""

# if this is a no-op just return

if self.figure is fig:

return

# if we currently have a figure (the case of both `self.figure`

# and *fig* being none is taken care of above) we then user is

# trying to change the figure an artist is associated with which

# is not allowed for the same reason as adding the same instance

# to more than one Axes

if self.figure is not None:

raise RuntimeError("Can not put single artist in "

"more than one figure")

self.figure = fig

if self.figure and self.figure is not self:

self.pchanged()

self.stale = True

def set_clip_box(self, clipbox):

"""

Set the artist's clip `.Bbox`.

Parameters

----------

clipbox : `.Bbox`

"""

self.clipbox = clipbox

self.pchanged()

self.stale = True

def set_clip_path(self, path, transform=None):

"""

Set the artist's clip path.

Parameters

----------

path : `.Patch` or `.Path` or `.TransformedPath` or None

The clip path. If given a `.Path`, *transform* must be provided as

well. If *None*, a previously set clip path is removed.

transform : `~matplotlib.transforms.Transform`, optional

Only used if *path* is a `.Path`, in which case the given `.Path`

is converted to a `.TransformedPath` using *transform*.

Notes

-----

For efficiency, if *path* is a `.Rectangle` this method will set the

clipping box to the corresponding rectangle and set the clipping path

to ``None``.

For technical reasons (support of ``setp``), a tuple

(*path*, *transform*) is also accepted as a single positional

parameter.

.. ACCEPTS: Patch or (Path, Transform) or None

"""

from matplotlib.patches import Patch, Rectangle

success = False

if transform is None:

if isinstance(path, Rectangle):

self.clipbox = TransformedBbox(Bbox.unit(),

path.get_transform())

self._clippath = None

success = True

elif isinstance(path, Patch):

self._clippath = TransformedPatchPath(path)

success = True

elif isinstance(path, tuple):

path, transform = path

if path is None:

self._clippath = None

success = True

elif isinstance(path, Path):

self._clippath = TransformedPath(path, transform)

success = True

elif isinstance(path, TransformedPatchPath):

self._clippath = path

success = True

self._clippath = path

success = True

if not success:

raise TypeError(

"Invalid arguments to set_clip_path, of type {} and {}"

.format(type(path).__name__, type(transform).__name__))

# This may result in the callbacks being hit twice, but guarantees they

# will be hit at least once.

self.pchanged()

self.stale = True

def get_alpha(self):

"""

Return the alpha value used for blending - not supported on all

backends

"""

return self._alpha

def get_visible(self):

"""Return the visibility."""

return self._visible

def get_animated(self):

"""Return the animated state."""

return self._animated

def get_in_layout(self):

"""

Return boolean flag, ``True`` if artist is included in layout

calculations.

E.g. :doc:`/tutorials/intermediate/constrainedlayout_guide`,

`.Figure.tight_layout()`, and

``fig.savefig(fname, bbox_inches='tight')``.

"""

return self._in_layout

def get_clip_on(self):

"""Return whether the artist uses clipping."""

return self._clipon

def get_clip_box(self):

"""Return the clipbox."""

return self.clipbox

def get_clip_path(self):

"""Return the clip path."""

return self._clippath

def get_transformed_clip_path_and_affine(self):

'''

Return the clip path with the non-affine part of its

transformation applied, and the remaining affine part of its

transformation.

'''

if self._clippath is not None:

return self._clippath.get_transformed_path_and_affine()

return None, None

def set_clip_on(self, b):

"""

Set whether the artist uses clipping.

When False artists will be visible out side of the axes which

can lead to unexpected results.

Parameters

----------

b : bool

"""

self._clipon = b

# This may result in the callbacks being hit twice, but ensures they

# are hit at least once

self.pchanged()

self.stale = True

def _set_gc_clip(self, gc):

'Set the clip properly for the gc'

if self._clipon:

if self.clipbox is not None:

gc.set_clip_rectangle(self.clipbox)

gc.set_clip_path(self._clippath)

else:

gc.set_clip_rectangle(None)

gc.set_clip_path(None)

def get_rasterized(self):

"""Return whether the artist is to be rasterized."""

return self._rasterized

def set_rasterized(self, rasterized):

"""

Force rasterized (bitmap) drawing in vector backend output.

Defaults to None, which implies the backend's default behavior.

Parameters

----------

rasterized : bool or None

"""

if rasterized and not hasattr(self.draw, "_supports_rasterization"):

cbook._warn_external(

"Rasterization of '%s' will be ignored" % self)

self._rasterized = rasterized

def get_agg_filter(self):

"""Return filter function to be used for agg filter."""

return self._agg_filter

def set_agg_filter(self, filter_func):

"""Set the agg filter.

Parameters

----------

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