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:
if artist.get_agg_filter() is not None:
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")
[docs]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
[docs] 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())
[docs] 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)
[docs] 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.
"""
ax = getattr(self, 'axes', None)
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)
[docs] 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:
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()
bbox = Bbox.intersection(bbox, clip_path.get_extents())
return bbox
[docs] 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 set_transform(self, t):
"""
Set the artist transform.
Parameters
----------
t : `.Transform`
"""
self._transform = t
self._transformSet = True
self.pchanged()
self.stale = True
[docs] 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, {}
[docs] 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
[docs] 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
[docs] 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
[docs] 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
[docs] 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
[docs] 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
[docs] 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
[docs] def get_path_effects(self):
return self._path_effects
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
elif isinstance(path, TransformedPath):
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
[docs] def get_alpha(self):
"""
Return the alpha value used for blending - not supported on all
backends
"""
return self._alpha
[docs] def get_visible(self):
"""Return the visibility."""
return self._visible
[docs] def get_animated(self):
"""Return the animated state."""
return self._animated
[docs] 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
[docs] def get_clip_on(self):
"""Return whether the artist uses clipping."""
return self._clipon
[docs] def get_clip_box(self):
"""Return the clipbox."""
return self.clipbox
[docs] def get_clip_path(self):
"""Return the clip path."""
return self._clippath
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)
[docs] 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
[docs] 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
[docs] def draw(self, renderer, *args, **kwargs):
"""
Draw the Artist using the given renderer.
This method will be overridden in the Artist subclasses. Typically,
it is implemented to not have any effect if the Artist is not visible
(`.Artist.get_visible` is *False*).
Parameters
----------
renderer : `.RendererBase` subclass.
"""
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 or None
"""
if alpha is not None and not isinstance(alpha, Number):
raise TypeError('alpha must be a float or None')
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 *props*.
"""
def _update_property(self, k, v):
"""Sorting out how to update property (setter or setattr).
Parameters
----------
k : str
The name of property to update
v : obj
The value to assign to the property
Returns
-------
ret : obj or None
If using a `set_*` method return it's return, else None.
"""
k = k.lower()
# white list attributes we want to be able to update through
# art.update, art.set, setp
if k in {'axes'}:
return setattr(self, k, v)
else:
func = getattr(self, 'set_' + k, None)
if not callable(func):
raise AttributeError('{!r} object has no property {!r}'
.format(type(self).__name__, k))
return func(v)
with cbook._setattr_cm(self, eventson=False):
ret = [_update_property(self, k, v) for k, v in props.items()]
if len(ret):
self.pchanged()
self.stale = True
return ret
[docs] def get_label(self):
"""Return the label used for this artist in the legend."""
return self._label
def set_label(self, s):
"""
Set a label that will be displayed in the legend.
Parameters
----------
s : object
*s* will be converted to a string by calling `str`.
"""
if s is not None:
self._label = str(s)
else:
self._label = None
self.pchanged()
self.stale = True
[docs] def get_zorder(self):
"""Return the artist's zorder."""
return self.zorder
def set_zorder(self, level):
"""
Set the zorder for the artist. Artists with lower zorder
values are drawn first.
Parameters
----------
level : float
"""
if level is None:
level = self.__class__.zorder
self.zorder = level
self.pchanged()
self.stale = True
@property
def sticky_edges(self):
"""
``x`` and ``y`` sticky edge lists for autoscaling.
When performing autoscaling, if a data limit coincides with a value in
the corresponding sticky_edges list, then no margin will be added--the
view limit "sticks" to the edge. A typical use case is histograms,
where one usually expects no margin on the bottom edge (0) of the
histogram.
This attribute cannot be assigned to; however, the ``x`` and ``y``
lists can be modified in place as needed.
Examples
--------
>>> artist.sticky_edges.x[:] = (xmin, xmax)
>>> artist.sticky_edges.y[:] = (ymin, ymax)
"""
return self._sticky_edges
def update_from(self, other):
'Copy properties from *other* to *self*.'
self._transform = other._transform
self._transformSet = other._transformSet
self._visible = other._visible
self._alpha = other._alpha
self.clipbox = other.clipbox
self._clipon = other._clipon
self._clippath = other._clippath
self._label = other._label
self._sketch = other._sketch
self._path_effects = other._path_effects
self.sticky_edges.x[:] = other.sticky_edges.x[:]
self.sticky_edges.y[:] = other.sticky_edges.y[:]
self.pchanged()
self.stale = True
def properties(self):
"""Return a dictionary of all the properties of the artist."""
return ArtistInspector(self).properties()
def set(self, **kwargs):
"""A property batch setter. Pass *kwargs* to set properties."""
kwargs = cbook.normalize_kwargs(kwargs, self)
props = OrderedDict(
sorted(kwargs.items(), reverse=True,
key=lambda x: (self._prop_order.get(x[0], 0), x[0])))
return self.update(props)
[docs] def findobj(self, match=None, include_self=True):
"""
Find artist objects.
Recursively find all `.Artist` instances contained in the artist.
Parameters
----------
match
A filter criterion for the matches. This can be
- *None*: Return all objects contained in artist.
- A function with signature ``def match(artist: Artist) -> bool``.
The result will only contain artists for which the function
returns *True*.
- A class instance: e.g., `.Line2D`. The result will only contain
artists of this class or its subclasses (``isinstance`` check).
include_self : bool
Include *self* in the list to be checked for a match.
Returns
-------
artists : list of `.Artist`
"""
if match is None: # always return True
def matchfunc(x):
return True
elif isinstance(match, type) and issubclass(match, Artist):
def matchfunc(x):
return isinstance(x, match)
elif callable(match):
matchfunc = match
else:
raise ValueError('match must be None, a matplotlib.artist.Artist '
'subclass, or a callable')
artists = sum([c.findobj(matchfunc) for c in self.get_children()], [])
if include_self and matchfunc(self):
artists.append(self)
return artists
[docs] def get_cursor_data(self, event):
"""
Return the cursor data for a given event.
.. note::
This method is intended to be overridden by artist subclasses.
As an end-user of Matplotlib you will most likely not call this
method yourself.
Cursor data can be used by Artists to provide additional context
information for a given event. The default implementation just returns
*None*.
Subclasses can override the method and return arbitrary data. However,
when doing so, they must ensure that `.format_cursor_data` can convert
the data to a string representation.
The only current use case is displaying the z-value of an `.AxesImage`
in the status bar of a plot window, while moving the mouse.
Parameters
----------
event : `matplotlib.backend_bases.MouseEvent`
See Also
--------
format_cursor_data
"""
return None
@property
def mouseover(self):
"""
If this property is set to *True*, the artist will be queried for
custom context information when the mouse cursor moves over it.
See also :meth:`get_cursor_data`, :class:`.ToolCursorPosition` and
:class:`.NavigationToolbar2`.
"""
return self._mouseover
@mouseover.setter
def mouseover(self, val):
val = bool(val)
self._mouseover = val
ax = self.axes
if ax:
if val:
ax._mouseover_set.add(self)
else:
ax._mouseover_set.discard(self)
class ArtistInspector:
"""
A helper class to inspect an `~matplotlib.artist.Artist` and return
information about its settable properties and their current values.
"""
def __init__(self, o):
r"""
Initialize the artist inspector with an `Artist` or an iterable of
`Artist`\s. If an iterable is used, we assume it is a homogeneous
sequence (all `Artists` are of the same type) and it is your
responsibility to make sure this is so.
"""
if not isinstance(o, Artist):
if np.iterable(o):
o = list(o)
if len(o):
o = o[0]
self.oorig = o
if not isinstance(o, type):
o = type(o)
self.o = o
self.aliasd = self.get_aliases()
def get_aliases(self):
"""
Get a dict mapping property fullnames to sets of aliases for each alias
in the :class:`~matplotlib.artist.ArtistInspector`.
e.g., for lines::
{'markerfacecolor': {'mfc'},
'linewidth' : {'lw'},
}
"""
names = [name for name in dir(self.o)
if name.startswith(('set_', 'get_'))
and callable(getattr(self.o, name))]
aliases = {}
for name in names:
func = getattr(self.o, name)
if not self.is_alias(func):
continue
propname = re.search("`({}.*)`".format(name[:4]), # get_.*/set_.*
inspect.getdoc(func)).group(1)
aliases.setdefault(propname[4:], set()).add(name[4:])
return aliases
_get_valid_values_regex = re.compile(
r"\n\s*(?:\.\.\s+)?ACCEPTS:\s*((?:.|\n)*?)(?:$|(?:\n\n))"
)
def get_valid_values(self, attr):
"""
Get the legal arguments for the setter associated with *attr*.
This is done by querying the docstring of the setter for a line that
begins with "ACCEPTS:" or ".. ACCEPTS:", and then by looking for a
numpydoc-style documentation for the setter's first argument.
"""
name = 'set_%s' % attr
if not hasattr(self.o, name):
raise AttributeError('%s has no function %s' % (self.o, name))
func = getattr(self.o, name)
docstring = inspect.getdoc(func)
if docstring is None:
return 'unknown'
if docstring.startswith('Alias for '):
return None
match = self._get_valid_values_regex.search(docstring)
if match is not None:
return re.sub("\n *", " ", match.group(1))
# Much faster than list(inspect.signature(func).parameters)[1],
# although barely relevant wrt. matplotlib's total import time.
param_name = func.__code__.co_varnames[1]
# We could set the presence * based on whether the parameter is a
# varargs (it can't be a varkwargs) but it's not really worth the it.
match = re.search(r"(?m)^ *\*?{} : (.+)".format(param_name), docstring)
if match:
return match.group(1)
return 'unknown'
def _get_setters_and_targets(self):
"""
Get the attribute strings and a full path to where the setter
is defined for all setters in an object.
"""
setters = []
for name in dir(self.o):
if not name.startswith('set_'):
continue
func = getattr(self.o, name)
if (not callable(func)
or len(inspect.signature(func).parameters) < 2
or self.is_alias(func)):
continue
setters.append(
(name[4:], f"{func.__module__}.{func.__qualname__}"))
return setters
def _replace_path(self, source_class):
"""
Changes the full path to the public API path that is used
in sphinx. This is needed for links to work.
"""
replace_dict = {'_base._AxesBase': 'Axes',
'_axes.Axes': 'Axes'}
for key, value in replace_dict.items():
source_class = source_class.replace(key, value)
return source_class
def get_setters(self):
"""
Get the attribute strings with setters for object. e.g., for a line,
return ``['markerfacecolor', 'linewidth', ....]``.
"""
return [prop for prop, target in self._get_setters_and_targets()]
def is_alias(self, o):
"""Return whether method object *o* is an alias for another method."""
ds = inspect.getdoc(o)
if ds is None:
return False
return ds.startswith('Alias for ')
def aliased_name(self, s):
"""
Return 'PROPNAME or alias' if *s* has an alias, else return 'PROPNAME'.
e.g., for the line markerfacecolor property, which has an
alias, return 'markerfacecolor or mfc' and for the transform
property, which does not, return 'transform'.
"""
aliases = ''.join(' or %s' % x for x in sorted(self.aliasd.get(s, [])))
return s + aliases
def aliased_name_rest(self, s, target):
"""
Return 'PROPNAME or alias' if *s* has an alias, else return 'PROPNAME',
formatted for ReST.
e.g., for the line markerfacecolor property, which has an
alias, return 'markerfacecolor or mfc' and for the transform
property, which does not, return 'transform'.
"""
aliases = ''.join(' or %s' % x for x in sorted(self.aliasd.get(s, [])))
return ':meth:`%s <%s>`%s' % (s, target, aliases)
def pprint_setters(self, prop=None, leadingspace=2):
"""
If *prop* is *None*, return a list of strings of all settable
properties and their valid values.
If *prop* is not *None*, it is a valid property name and that
property will be returned as a string of property : valid
values.
"""
if leadingspace:
pad = ' ' * leadingspace
else:
pad = ''
if prop is not None:
accepts = self.get_valid_values(prop)
return '%s%s: %s' % (pad, prop, accepts)
attrs = self._get_setters_and_targets()
attrs.sort()
lines = []
for prop, path in attrs:
accepts = self.get_valid_values(prop)
name = self.aliased_name(prop)
lines.append('%s%s: %s' % (pad, name, accepts))
return lines
def pprint_setters_rest(self, prop=None, leadingspace=4):
"""
If *prop* is *None*, return a list of strings of all settable
properties and their valid values. Format the output for ReST
If *prop* is not *None*, it is a valid property name and that
property will be returned as a string of property : valid
values.
"""
if leadingspace:
pad = ' ' * leadingspace
else:
pad = ''
if prop is not None:
accepts = self.get_valid_values(prop)
return '%s%s: %s' % (pad, prop, accepts)
attrs = sorted(self._get_setters_and_targets())
names = [self.aliased_name_rest(prop, target).replace(
'_base._AxesBase', 'Axes').replace(
'_axes.Axes', 'Axes')
for prop, target in attrs]
accepts = [self.get_valid_values(prop) for prop, target in attrs]
col0_len = max(len(n) for n in names)
col1_len = max(len(a) for a in accepts)
table_formatstr = pad + ' ' + '=' * col0_len + ' ' + '=' * col1_len
return [
'',
pad + '.. table::',
pad + ' :class: property-table',
'',
table_formatstr,
pad + ' ' + 'Property'.ljust(col0_len)
+ ' ' + 'Description'.ljust(col1_len),
table_formatstr,
*[pad + ' ' + n.ljust(col0_len) + ' ' + a.ljust(col1_len)
for n, a in zip(names, accepts)],
table_formatstr,
'',
]
def properties(self):
"""Return a dictionary mapping property name -> value."""
o = self.oorig
getters = [name for name in dir(o)
if name.startswith('get_') and callable(getattr(o, name))]
getters.sort()
d = {}
for name in getters:
func = getattr(o, name)
if self.is_alias(func):
continue
try:
with warnings.catch_warnings():
warnings.simplefilter('ignore')
val = func()
except Exception:
continue
else:
d[name[4:]] = val
return d
def pprint_getters(self):
"""Return the getters and actual values as list of strings."""
lines = []
for name, val in sorted(self.properties().items()):
if getattr(val, 'shape', ()) != () and len(val) > 6:
s = str(val[:6]) + '...'
else:
s = str(val)
s = s.replace('\n', ' ')
if len(s) > 50:
s = s[:50] + '...'
name = self.aliased_name(name)
lines.append(' %s = %s' % (name, s))
return lines
def getp(obj, property=None):
"""
Return the value of object's property. *property* is an optional string
for the property you want to return
Example usage::
getp(obj) # get all the object properties
getp(obj, 'linestyle') # get the linestyle property
*obj* is a :class:`Artist` instance, e.g.,
:class:`~matplotlib.lines.Line2D` or an instance of a
:class:`~matplotlib.axes.Axes` or :class:`matplotlib.text.Text`.
If the *property* is 'somename', this function returns
obj.get_somename()
:func:`getp` can be used to query all the gettable properties with
``getp(obj)``. Many properties have aliases for shorter typing, e.g.
'lw' is an alias for 'linewidth'. In the output, aliases and full
property names will be listed as:
property or alias = value
e.g.:
linewidth or lw = 2
"""
if property is None:
insp = ArtistInspector(obj)
ret = insp.pprint_getters()
print('\n'.join(ret))
return
func = getattr(obj, 'get_' + property)
return func()
# alias
get = getp
def setp(obj, *args, **kwargs):
"""
Set a property on an artist object.
matplotlib supports the use of :func:`setp` ("set property") and
:func:`getp` to set and get object properties, as well as to do
introspection on the object. For example, to set the linestyle of a
line to be dashed, you can do::
>>> line, = plot([1, 2, 3])
>>> setp(line, linestyle='--')
If you want to know the valid types of arguments, you can provide
the name of the property you want to set without a value::
>>> setp(line, 'linestyle')
linestyle: {'-', '--', '-.', ':', '', (offset, on-off-seq), ...}
If you want to see all the properties that can be set, and their
possible values, you can do::
>>> setp(line)
... long output listing omitted
You may specify another output file to `setp` if `sys.stdout` is not
acceptable for some reason using the *file* keyword-only argument::
>>> with fopen('output.log') as f:
>>> setp(line, file=f)
:func:`setp` operates on a single instance or a iterable of
instances. If you are in query mode introspecting the possible
values, only the first instance in the sequence is used. When
actually setting values, all the instances will be set. e.g.,
suppose you have a list of two lines, the following will make both
lines thicker and red::
>>> x = arange(0, 1, 0.01)
>>> y1 = sin(2*pi*x)
>>> y2 = sin(4*pi*x)
>>> lines = plot(x, y1, x, y2)
>>> setp(lines, linewidth=2, color='r')
:func:`setp` works with the MATLAB style string/value pairs or
with python kwargs. For example, the following are equivalent::
>>> setp(lines, 'linewidth', 2, 'color', 'r') # MATLAB style
>>> setp(lines, linewidth=2, color='r') # python style
"""
if isinstance(obj, Artist):
objs = [obj]
else:
objs = list(cbook.flatten(obj))
if not objs:
return
insp = ArtistInspector(objs[0])
# file has to be popped before checking if kwargs is empty
printArgs = {}
if 'file' in kwargs:
printArgs['file'] = kwargs.pop('file')
if not kwargs and len(args) < 2:
if args:
print(insp.pprint_setters(prop=args[0]), **printArgs)
else:
print('\n'.join(insp.pprint_setters()), **printArgs)
return
if len(args) % 2:
raise ValueError('The set args must be string, value pairs')
# put args into ordereddict to maintain order
funcvals = OrderedDict((k, v) for k, v in zip(args[::2], args[1::2]))
ret = [o.update(funcvals) for o in objs] + [o.set(**kwargs) for o in objs]
return list(cbook.flatten(ret))
def kwdoc(artist):
r"""
Inspect an `~matplotlib.artist.Artist` class (using `.ArtistInspector`) and
return information about its settable properties and their current values.
Parameters
----------
artist : `~matplotlib.artist.Artist` or an iterable of `Artist`\s
Returns
-------
string
The settable properties of *artist*, as plain text if
:rc:`docstring.hardcopy` is False and as a rst table (intended for
use in Sphinx) if it is True.
"""
ai = ArtistInspector(artist)
return ('\n'.join(ai.pprint_setters_rest(leadingspace=4))
if matplotlib.rcParams['docstring.hardcopy'] else
'Properties:\n' + '\n'.join(ai.pprint_setters(leadingspace=4)))
docstring.interpd.update(Artist=kwdoc(Artist))
