Version 3.0.3
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:
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")
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)
if ax is None or ax.xaxis is 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
"""
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 :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()
bbox = Bbox.intersection(bbox, clip_path.get_extents())
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
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
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):
"""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('Unknown property %s' % 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
def get_label(self):
"""Get the label used for this artist in the legend."""
return self._label
def set_label(self, s):
"""
Set the label to *s* for auto 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
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 usecase 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 mapping property name -> value for all Artist props
"""
return ArtistInspector(self).properties()
def set(self, **kwargs):
"""A property batch setter. Pass *kwargs* to set properties.
"""
props = OrderedDict(
sorted(kwargs.items(), reverse=True,
key=lambda x: (self._prop_order.get(x[0], 0), x[0])))
return self.update(props)
def findobj(self, match=None, include_self=True):
"""
Find artist objects.
Recursively find all :class:`~matplotlib.artist.Artist` instances
contained in self.
*match* can be
- None: return all objects contained in artist.
- function with signature ``boolean = match(artist)``
used to filter matches
- class instance: e.g., Line2D. Only return artists of class type.
If *include_self* is True (default), include self in the list to be
checked for a match.
"""
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
def get_cursor_data(self, event):
"""
Get the cursor data for a given event.
"""
return None
def format_cursor_data(self, data):
"""
Return *cursor data* string formatted.
"""
try:
data[0]
except (TypeError, IndexError):
data = [data]
data_str = ', '.join('{:0.3g}'.format(item) for item in data if
isinstance(item, (np.floating, np.integer, int, float)))
return "[" + data_str + "]"
@property
def mouseover(self):
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(object):
"""
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 cbook.iterable(o):
o = list(o)
if len(o):
o = o[0]
self.oorig = o
if not inspect.isclass(o):
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_.*
func.__doc__).group(1)
aliases.setdefault(propname, 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 function *set_attr*
for a line that begins with "ACCEPTS" or ".. ACCEPTS":
e.g., for a line linestyle, return
"[ ``'-'`` | ``'--'`` | ``'-.'`` | ``':'`` | ``'steps'`` | ``'None'``
]"
"""
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 = func.__doc__
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]
match = re.search("(?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):
continue
nargs = len(inspect.getfullargspec(func).args)
if nargs < 2 or self.is_alias(func):
continue
source_class = self.o.__module__ + "." + self.o.__name__
for cls in self.o.mro():
if name in cls.__dict__:
source_class = cls.__module__ + "." + cls.__name__
break
source_class = self._replace_path(source_class)
setters.append((name[4:], source_class + "." + name))
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 *True* if method object *o* is an alias for another
function.
"""
ds = o.__doc__
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'
"""
if s in self.aliasd:
return s + ''.join([' or %s' % x
for x in sorted(self.aliasd[s])])
else:
return s
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'
"""
if s in self.aliasd:
aliases = ''.join([' or %s' % x
for x in sorted(self.aliasd[s])])
else:
aliases = ''
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 = self._get_setters_and_targets()
attrs.sort()
lines = []
########
names = [self.aliased_name_rest(prop, target)
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)
lines.append('')
lines.append(pad + '.. table::')
lines.append(pad + ' :class: property-table')
pad += ' '
table_formatstr = pad + '=' * col0_len + ' ' + '=' * col1_len
lines.append('')
lines.append(table_formatstr)
lines.append(pad + 'Property'.ljust(col0_len + 3) +
'Description'.ljust(col1_len))
lines.append(table_formatstr)
lines.extend([pad + n.ljust(col0_len + 3) + a.ljust(col1_len)
for n, a in zip(names, accepts)])
lines.append(table_formatstr)
lines.append('')
return lines
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 = dict()
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:
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:`~matplotllib.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: [ '-' | '--' | '-.' | ':' | 'steps' | 'None' ]
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(0,1.0,0.01)
>>> 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 and return
information about its settable properties and their current values.
It use the class `.ArtistInspector`.
Parameters
----------
artist : `~matplotlib.artist.Artist` or an iterable of `Artist`\s
Returns
-------
string
Returns a string with a list or rst table with the settable properties
of the *artist*. The formating depends on the value of
:rc:`docstring.hardcopy`. False result in a list that is intended for
easy reading as a docstring and True result in a rst table intended
for rendering the documentation with sphinx.
"""
hardcopy = matplotlib.rcParams['docstring.hardcopy']
if hardcopy:
return '\n'.join(ArtistInspector(artist).pprint_setters_rest(
leadingspace=4))
else:
return '\n'.join(ArtistInspector(artist).pprint_setters(
leadingspace=2))
docstring.interpd.update(Artist=kwdoc(Artist))