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Edit File: artist.py

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") class Artist(object): """ Abstract base class for objects that render into a FigureCanvas. Typically, all visible elements in a figure are subclasses of Artist. """ @cbook.deprecated("3.1") @property def aname(self): return 'Artist' zorder = 0 # order of precedence when bulk setting/updating properties # via update. The keys should be property names and the values # integers _prop_order = dict(color=-1) def __init__(self): self._stale = True self.stale_callback = None self._axes = None self.figure = None self._transform = None self._transformSet = False self._visible = True self._animated = False self._alpha = None self.clipbox = None self._clippath = None self._clipon = True self._label = '' self._picker = None self._contains = None self._rasterized = None self._agg_filter = None self._mouseover = False self.eventson = False # fire events only if eventson self._oid = 0 # an observer id self._propobservers = {} # a dict from oids to funcs try: self.axes = None except AttributeError: # Handle self.axes as a read-only property, as in Figure. pass self._remove_method = None self._url = None self._gid = None self._snap = None self._sketch = rcParams['path.sketch'] self._path_effects = rcParams['path.effects'] self._sticky_edges = _XYPair([], []) self._in_layout = True def __getstate__(self): d = self.__dict__.copy() # remove the unpicklable remove method, this will get re-added on load # (by the axes) if the artist lives on an axes. d['stale_callback'] = None return d def remove(self): """ Remove the artist from the figure if possible. The effect will not be visible until the figure is redrawn, e.g., with `.FigureCanvasBase.draw_idle`. Call `~.axes.Axes.relim` to update the axes limits if desired. Note: `~.axes.Axes.relim` will not see collections even if the collection was added to the axes with *autolim* = True. Note: there is no support for removing the artist's legend entry. """ # There is no method to set the callback. Instead the parent should # set the _remove_method attribute directly. This would be a # protected attribute if Python supported that sort of thing. The # callback has one parameter, which is the child to be removed. if self._remove_method is not None: self._remove_method(self) # clear stale callback self.stale_callback = None _ax_flag = False if hasattr(self, 'axes') and self.axes: # remove from the mouse hit list self.axes._mouseover_set.discard(self) # mark the axes as stale self.axes.stale = True # decouple the artist from the axes self.axes = None _ax_flag = True if self.figure: self.figure = None if not _ax_flag: self.figure = True else: raise NotImplementedError('cannot remove artist') # TODO: the fix for the collections relim problem is to move the # limits calculation into the artist itself, including the property of # whether or not the artist should affect the limits. Then there will # be no distinction between axes.add_line, axes.add_patch, etc. # TODO: add legend support def have_units(self): """Return *True* if units are set on 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): """ Convert *x* using the unit type of the xaxis. If the artist is not in contained in an Axes or if the xaxis does not have units, *x* itself is returned. """ ax = getattr(self, 'axes', None) if ax is None or ax.xaxis is None: return x return ax.xaxis.convert_units(x) def convert_yunits(self, y): """ Convert *y* using the unit type of the yaxis. If the artist is not in contained in an Axes or if the yaxis does not have units, *y* itself is returned. """ 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) 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 def add_callback(self, func): """ Add a callback function that will be called whenever one of the `.Artist`'s properties changes. Parameters ---------- func : callable The callback function. It must have the signature:: def func(artist: Artist) -> Any where *artist* is the calling `.Artist`. Return values may exist but are ignored. Returns ------- oid : int The observer id associated with the callback. This id can be used for removing the callback with `.remove_callback` later. See Also -------- remove_callback """ oid = self._oid self._propobservers[oid] = func self._oid += 1 return oid def remove_callback(self, oid): """ Remove a callback based on its observer id. See Also -------- add_callback """ try: del self._propobservers[oid] except KeyError: pass def pchanged(self): """ Call all of the registered callbacks. This function is triggered internally when a property is changed. See Also -------- add_callback remove_callback """ for oid, func in self._propobservers.items(): func(self) def is_transform_set(self): """ Return whether the Artist has an explicitly set transform. This is *True* after `.set_transform` has been called. """ return self._transformSet def set_transform(self, t): """ Set the artist transform. Parameters ---------- t : `.Transform` """ self._transform = t self._transformSet = True self.pchanged() self.stale = True def get_transform(self): """Return the `.Transform` instance used by this artist.""" if self._transform is None: self._transform = IdentityTransform() elif (not isinstance(self._transform, Transform) and hasattr(self._transform, '_as_mpl_transform')): self._transform = self._transform._as_mpl_transform(self.axes) return self._transform def get_children(self): r"""Return a list of the child `.Artist`\s of this `.Artist`.""" return [] def 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 """ if self._contains is not None: return self._contains(self, mouseevent) _log.warning("%r needs 'contains' method", self.__class__.__name__) return False, {} def set_contains(self, picker): """ Define a custom contains test for the artist. The provided callable replaces the default `.contains` method of the artist. Parameters ---------- picker : callable A custom picker function to evaluate if an event is within the artist. The function must have the signature:: def contains(artist: Artist, event: MouseEvent) -> bool, dict that returns: - a bool indicating if the event is within the artist - a dict of additional information. The dict should at least return the same information as the default ``contains()`` implementation of the respective artist, but may provide additional information. """ if not callable(picker): raise TypeError("picker is not a callable") self._contains = picker def get_contains(self): """ Return the custom contains function of the artist if set, or *None*. See Also -------- set_contains """ return self._contains def pickable(self): """ Return whether the artist is pickable. See Also -------- set_picker, get_picker, pick """ return self.figure is not None and self._picker is not None def pick(self, mouseevent): """ Process a pick event. Each child artist will fire a pick event if *mouseevent* is over the artist and the artist has picker set. See Also -------- set_picker, get_picker, pickable """ # Pick self if self.pickable(): picker = self.get_picker() if callable(picker): inside, prop = picker(self, mouseevent) else: inside, prop = self.contains(mouseevent) if inside: self.figure.canvas.pick_event(mouseevent, self, **prop) # Pick children for a in self.get_children(): # make sure the event happened in the same axes ax = getattr(a, 'axes', None) if (mouseevent.inaxes is None or ax is None or mouseevent.inaxes == ax): # we need to check if mouseevent.inaxes is None # because some objects associated with an axes (e.g., a # tick label) can be outside the bounding box of the # axes and inaxes will be None # also check that ax is None so that it traverse objects # which do no have an axes property but children might a.pick(mouseevent) def set_picker(self, picker): """ Define the picking behavior of the artist. Parameters ---------- picker : None or bool or float or callable This can be one of the following: - *None*: Picking is disabled for this artist (default). - A boolean: If *True* then picking will be enabled and the artist will fire a pick event if the mouse event is over the artist. - A float: If picker is a number it is interpreted as an epsilon tolerance in points and the artist will fire off an event if it's data is within epsilon of the mouse event. For some artists like lines and patch collections, the artist may provide additional data to the pick event that is generated, e.g., the indices of the data within epsilon of the pick event - A function: If picker is callable, it is a user supplied function which determines whether the artist is hit by the mouse event:: hit, props = picker(artist, mouseevent) to determine the hit test. if the mouse event is over the artist, return *hit=True* and props is a dictionary of properties you want added to the PickEvent attributes. """ self._picker = picker def get_picker(self): """ Return the picking behavior of the artist. The possible values are described in `.set_picker`. See Also -------- set_picker, pickable, pick """ return self._picker def get_url(self): """Return the url.""" return self._url def set_url(self, url): """ Set the url for the artist. Parameters ---------- url : str """ self._url = url def get_gid(self): """Return the group id.""" return self._gid def set_gid(self, gid): """ Set the (group) id for the artist. Parameters ---------- gid : str """ self._gid = gid def get_snap(self): """ Returns the snap setting. See `.set_snap` for details. """ if rcParams['path.snap']: return self._snap else: return False def set_snap(self, snap): """ Set the snapping behavior. Snapping aligns positions with the pixel grid, which results in clearer images. For example, if a black line of 1px width was defined at a position in between two pixels, the resulting image would contain the interpolated value of that line in the pixel grid, which would be a grey value on both adjacent pixel positions. In contrast, snapping will move the line to the nearest integer pixel value, so that the resulting image will really contain a 1px wide black line. Snapping is currently only supported by the Agg and MacOSX backends. Parameters ---------- snap : bool or None Possible values: - *True*: Snap vertices to the nearest pixel center. - *False*: Do not modify vertex positions. - *None*: (auto) If the path contains only rectilinear line segments, round to the nearest pixel center. """ self._snap = snap self.stale = True def get_sketch_params(self): """ Returns the sketch parameters for the artist. Returns ------- sketch_params : tuple or None A 3-tuple with the following elements: - *scale*: The amplitude of the wiggle perpendicular to the source line. - *length*: The length of the wiggle along the line. - *randomness*: The scale factor by which the length is shrunken or expanded. Returns *None* if no sketch parameters were set. """ return self._sketch def set_sketch_params(self, scale=None, length=None, randomness=None): """ Sets the sketch parameters. Parameters ---------- scale : float, optional The amplitude of the wiggle perpendicular to the source line, in pixels. If scale is `None`, or not provided, no sketch filter will be provided. length : float, optional The length of the wiggle along the line, in pixels (default 128.0) randomness : float, optional The scale factor by which the length is shrunken or expanded (default 16.0) .. ACCEPTS: (scale: float, length: float, randomness: float) """ if scale is None: self._sketch = None else: self._sketch = (scale, length or 128.0, randomness or 16.0) self.stale = True def set_path_effects(self, path_effects): """Set the path effects. Parameters ---------- path_effects : `.AbstractPathEffect` """ self._path_effects = path_effects self.stale = True def get_path_effects(self): return self._path_effects def get_figure(self): """Return the `.Figure` instance the artist belongs to.""" return self.figure def set_figure(self, fig): """ Set the `.Figure` instance the artist belongs to. Parameters ---------- fig : `.Figure` """ # if this is a no-op just return if self.figure is fig: return # if we currently have a figure (the case of both `self.figure` # and `fig` being none is taken care of above) we then user is # trying to change the figure an artist is associated with which # is not allowed for the same reason as adding the same instance # to more than one Axes if self.figure is not None: raise RuntimeError("Can not put single artist in " "more than one figure") self.figure = fig if self.figure and self.figure is not self: self.pchanged() self.stale = True def set_clip_box(self, clipbox): """ Set the artist's clip `.Bbox`. Parameters ---------- clipbox : `.Bbox` """ self.clipbox = clipbox self.pchanged() self.stale = True def set_clip_path(self, path, transform=None): """ Set the artist's clip path, 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 visibility.""" return self._visible def get_animated(self): """Return the animated state.""" return self._animated def get_in_layout(self): """ Return boolean flag, ``True`` if artist is included in layout calculations. E.g. :doc:`/tutorials/intermediate/constrainedlayout_guide`, `.Figure.tight_layout()`, and ``fig.savefig(fname, bbox_inches='tight')``. """ return self._in_layout def get_clip_on(self): """Return whether the artist uses clipping.""" return self._clipon def get_clip_box(self): """Return the clipbox.""" return self.clipbox def get_clip_path(self): """Return the clip path.""" return self._clippath def get_transformed_clip_path_and_affine(self): ''' Return the clip path with the non-affine part of its transformation applied, and the remaining affine part of its transformation. ''' if self._clippath is not None: return self._clippath.get_transformed_path_and_affine() return None, None def set_clip_on(self, b): """ Set whether the artist uses clipping. When False artists will be visible out side of the axes which can lead to unexpected results. Parameters ---------- b : bool """ self._clipon = b # This may result in the callbacks being hit twice, but ensures they # are hit at least once self.pchanged() self.stale = True def _set_gc_clip(self, gc): 'Set the clip properly for the gc' if self._clipon: if self.clipbox is not None: gc.set_clip_rectangle(self.clipbox) gc.set_clip_path(self._clippath) else: gc.set_clip_rectangle(None) gc.set_clip_path(None) def get_rasterized(self): """Return whether the artist is to be rasterized.""" return self._rasterized def set_rasterized(self, rasterized): """ Force rasterized (bitmap) drawing in vector backend output. Defaults to None, which implies the backend's default behavior. Parameters ---------- rasterized : bool or None """ if rasterized and not hasattr(self.draw, "_supports_rasterization"): cbook._warn_external( "Rasterization of '%s' will be ignored" % self) self._rasterized = rasterized def get_agg_filter(self): """Return filter function to be used for agg filter.""" return self._agg_filter def set_agg_filter(self, filter_func): """Set the agg filter. Parameters ---------- 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): """ 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 """ 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 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 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, getattr(type(self), "_alias_map", {})) 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 `.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 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 def format_cursor_data(self, data): """ Return a string representation of *data*. .. 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. The default implementation converts ints and floats and arrays of ints and floats into a comma-separated string enclosed in square brackets. See Also -------- get_cursor_data """ try: data[0] except (TypeError, IndexError): data = [data] data_str = ', '.join('{:0.3g}'.format(item) for item in data if isinstance(item, Number)) 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 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): 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 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) 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: [ '-' | '--' | '-.' | ':' | '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 (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. """ 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))