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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 3.0.3 documentation</title>

type="text/css" />

type="text/css" />

title="Search within Matplotlib 3.0.3 documentation"

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

from collections import OrderedDict, namedtuple

from functools import wraps

import inspect

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)

# Note, matplotlib artists use the doc strings for set and get

# methods to enable the introspection methods of setp and getp. Every

# set_* method should have a docstring containing the line

#

# ACCEPTS: [ legal | values ]

#

# and aliases for setters and getters should have a docstring that

# starts with 'alias for ', as in 'alias for set_somemethod'

#

# You may wonder why we use so much boiler-plate manually defining the

# set_alias and get_alias functions, rather than using some clever

# python trick. The answer is that I need to be able to manipulate

# the docstring, and there is no clever way to do that in python 2.2,

# as far as I can see - see

#

# https://mail.python.org/pipermail/python-list/2004-October/242925.html

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")

class Artist(object):

"""

Abstract base class for someone who renders into a

:class:`FigureCanvas`.

"""

aname = '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

:meth:`matplotlib.axes.Axes.draw_idle`. Call

:meth:`matplotlib.axes.Axes.relim` to update the axes limits

if desired.

Note: :meth:`~matplotlib.axes.Axes.relim` will not see

collections even if the collection was added to 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 the *x* or *y* axes'

ax = self.axes

if ax is None or ax.xaxis is None:

return False

return ax.xaxis.have_units() or ax.yaxis.have_units()

def convert_xunits(self, x):

"""For artists in an axes, if the xaxis has units support,

convert *x* using xaxis unit type

"""

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

return x

return ax.xaxis.convert_units(x)

def convert_yunits(self, y):

"""For artists in an axes, if the yaxis has units support,

convert *y* using yaxis unit type

"""

if ax is None or ax.yaxis is None:

return y

return ax.yaxis.convert_units(y)

@property

def axes(self):

"""

The :class:`~matplotlib.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):

"""

If 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.

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_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 : `.BboxBase`

containing the 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:

bbox = Bbox.intersection(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()

return bbox

def add_callback(self, func):

"""

Adds a callback function that will be called whenever one of

the :class:`Artist`'s properties changes.

Returns an *id* that is useful for removing the callback with

:meth:`remove_callback` later.

"""

oid = self._oid

self._propobservers[oid] = func

self._oid += 1

return oid

def remove_callback(self, oid):

"""

Remove a callback based on its *id*.

.. seealso::

:meth:`add_callback`

For adding callbacks

"""

try:

del self._propobservers[oid]

except KeyError:

pass

def pchanged(self):

"""

Fire an event when property changed, calling all of the

registered callbacks.

"""

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

func(self)

def is_transform_set(self):

"""

Returns *True* if :class:`Artist` has a transform explicitly

set.

"""

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 :class:`~matplotlib.transforms.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

@cbook.deprecated("2.2")

def hitlist(self, event):

"""

List the children of the artist which contain the mouse event *event*.

"""

L = []

try:

hascursor, info = self.contains(event)

if hascursor:

L.append(self)

except:

import traceback

traceback.print_exc()

print("while checking", self.__class__)

for a in self.get_children():

L.extend(a.hitlist(event))

return L

def get_children(self):

"""

Return a list of the child :class:`Artist`s this

:class:`Artist` contains.

"""

return []

def contains(self, mouseevent):

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

Returns the truth value and a dictionary of artist specific details of

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

individual artists for details.

"""

if callable(self._contains):

return self._contains(self, mouseevent)

warnings.warn("'%s' needs 'contains' method" % self.__class__.__name__)

return False, {}

def set_contains(self, picker):

"""

Replace the contains test used by this artist. The new picker

should be a callable function which determines whether the

artist is hit by the mouse event::

hit, props = picker(artist, mouseevent)

If the mouse event is over the artist, return *hit* = *True*

and *props* is a dictionary of properties you want returned

with the contains test.

Parameters

----------

picker : callable

"""

self._contains = picker

def get_contains(self):

"""

Return the _contains test used by the artist, or *None* for default.

"""

return self._contains

def pickable(self):

'Return *True* if :class:`Artist` is pickable.'

return (self.figure is not None and

self.figure.canvas is not None and

self._picker is not None)

def pick(self, mouseevent):

"""

Process pick event

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

the artist and the artist has picker set

"""

# 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):

"""

Set the epsilon for picking used by this artist

*picker* 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.

Parameters

----------

picker : None or bool or float or callable

"""

self._picker = picker

def get_picker(self):

"""Return the picker object used by this artist."""

return self._picker

@cbook.deprecated("2.2", "artist.figure is not None")

def is_figure_set(self):

"""Returns whether the artist is assigned to a `.Figure`."""

return self.figure is not None

def get_url(self):

"""Returns the url."""

return self._url

def set_url(self, url):

"""

Sets the url for the artist.

Parameters

----------

url : str

"""

self._url = url

def get_gid(self):

"""Returns the group id."""

return self._gid

def set_gid(self, gid):

"""

Sets the (group) id for the artist.

Parameters

----------

gid : str

"""

self._gid = gid

def get_snap(self):

"""

Returns the snap setting which may be:

* True: snap vertices to the nearest pixel center

* False: leave vertices as-is

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

segments, round to the nearest pixel center

Only supported by the Agg and MacOSX backends.

"""

if rcParams['path.snap']:

return self._snap

else:

return False

def set_snap(self, snap):

"""

Sets the snap setting which may be:

* True: snap vertices to the nearest pixel center

* False: leave vertices as-is

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

segments, round to the nearest pixel center

Only supported by the Agg and MacOSX backends.

Parameters

----------

snap : bool or None

"""

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.

May return `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, which may be:

- a :class:`~matplotlib.patches.Patch` (or subclass) instance; or

- a :class:`~matplotlib.path.Path` instance, in which case a

:class:`~matplotlib.transforms.Transform` instance, which will be

applied to the path before using it for clipping, must be provided;

or

- ``None``, to remove a previously set clipping path.

For efficiency, if the path happens to be an axis-aligned rectangle,

this method will set the clipping box to the corresponding rectangle

and set the clipping path to ``None``.

ACCEPTS: [(`~matplotlib.path.Path`, `.Transform`) | `.Patch` | 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 artist's visiblity"

return self._visible

def get_animated(self):

"Return the artist's 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 artist uses clipping'

return self._clipon

def get_clip_box(self):

'Return artist clipbox'

return self.clipbox

def get_clip_path(self):

'Return artist 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 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"):

warnings.warn("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

----------

filter_func : callable

A filter function, which takes a (m, n, 3) float array and a dpi

value, and returns a (m, n, 3) array.

.. ACCEPTS: a filter function, which takes a (m, n, 3) float array

and a dpi value, and returns a (m, n, 3) array

"""

self._agg_filter = filter_func

self.stale = True

def draw(self, renderer, *args, **kwargs):

'Derived classes drawing method'

if not self.get_visible():

return

self.stale = False

def set_alpha(self, alpha):

"""

Set the alpha value used for blending - not supported on all backends.

Parameters

----------

alpha : float

"""

self._alpha = alpha

self.pchanged()

self.stale = True

def set_visible(self, b):

"""

Set the artist's visibility.

Parameters

----------

b : bool

"""

self._visible = b

self.pchanged()

self.stale = True

def set_animated(self, b):

"""

Set the artist's animation state.

Parameters

----------

b : bool

"""

if self._animated != b:

self._animated = b

self.pchanged()

def set_in_layout(self, in_layout):

"""

Set if artist is to be included in layout calculations,

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

`.Figure.tight_layout()`, and

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

Parameters

----------

in_layout : bool

"""

self._in_layout = in_layout

def update(self, props):

"""

Update this artist's properties from the dictionary *prop*.

"""

def _update_property(self, k, v):

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