Source code for matplotlib.axes._subplots

import functools
import uuid

from matplotlib import cbook, docstring
import matplotlib.artist as martist
from matplotlib.axes._axes import Axes
from matplotlib.gridspec import GridSpec, SubplotSpec
import matplotlib._layoutbox as layoutbox

[docs]class SubplotBase: """ Base class for subplots, which are :class:`Axes` instances with additional methods to facilitate generating and manipulating a set of :class:`Axes` within a figure. """
[docs] def __init__(self, fig, *args, **kwargs): """ Parameters ---------- fig : `matplotlib.figure.Figure` *args : tuple (*nrows*, *ncols*, *index*) or int The array of subplots in the figure has dimensions ``(nrows, ncols)``, and *index* is the index of the subplot being created. *index* starts at 1 in the upper left corner and increases to the right. If *nrows*, *ncols*, and *index* are all single digit numbers, then *args* can be passed as a single 3-digit number (e.g. 234 for (2, 3, 4)). **kwargs Keyword arguments are passed to the Axes (sub)class constructor. """ self.figure = fig self._subplotspec = SubplotSpec._from_subplot_args(fig, args) self.update_params() # _axes_class is set in the subplot_class_factory self._axes_class.__init__(self, fig, self.figbox, **kwargs) # add a layout box to this, for both the full axis, and the poss # of the axis. We need both because the axes may become smaller # due to parasitic axes and hence no longer fill the subplotspec. if self._subplotspec._layoutbox is None: self._layoutbox = None self._poslayoutbox = None else: name = + '.ax' name = name + layoutbox.seq_id() self._layoutbox = layoutbox.LayoutBox( parent=self._subplotspec._layoutbox, name=name, artist=self) self._poslayoutbox = layoutbox.LayoutBox( parent=self._layoutbox,'.pos', pos=True, subplot=True, artist=self)
[docs] def __reduce__(self): # get the first axes class which does not inherit from a subplotbase axes_class = next( c for c in type(self).__mro__ if issubclass(c, Axes) and not issubclass(c, SubplotBase)) return (_picklable_subplot_class_constructor, (axes_class,), self.__getstate__())
[docs] def get_geometry(self): """Get the subplot geometry, e.g., (2, 2, 3).""" rows, cols, num1, num2 = self.get_subplotspec().get_geometry() return rows, cols, num1 + 1 # for compatibility
# COVERAGE NOTE: Never used internally or from examples
[docs] def change_geometry(self, numrows, numcols, num): """Change subplot geometry, e.g., from (1, 1, 1) to (2, 2, 3).""" self._subplotspec = GridSpec(numrows, numcols, figure=self.figure)[num - 1] self.update_params() self.set_position(self.figbox)
[docs] def get_subplotspec(self): """Return the `.SubplotSpec` instance associated with the subplot.""" return self._subplotspec
[docs] def set_subplotspec(self, subplotspec): """Set the `.SubplotSpec`. instance associated with the subplot.""" self._subplotspec = subplotspec
[docs] def get_gridspec(self): """Return the `.GridSpec` instance associated with the subplot.""" return self._subplotspec.get_gridspec()
[docs] def update_params(self): """Update the subplot position from ``self.figure.subplotpars``.""" self.figbox, _, _, self.numRows, self.numCols = \ self.get_subplotspec().get_position(self.figure, return_all=True)
@cbook.deprecated("3.2", alternative="ax.get_subplotspec().rowspan.start") @property def rowNum(self): return self.get_subplotspec().rowspan.start @cbook.deprecated("3.2", alternative="ax.get_subplotspec().colspan.start") @property def colNum(self): return self.get_subplotspec().colspan.start
[docs] def is_first_row(self): return self.get_subplotspec().rowspan.start == 0
[docs] def is_last_row(self): return self.get_subplotspec().rowspan.stop == self.get_gridspec().nrows
[docs] def is_first_col(self): return self.get_subplotspec().colspan.start == 0
[docs] def is_last_col(self): return self.get_subplotspec().colspan.stop == self.get_gridspec().ncols
[docs] def label_outer(self): """ Only show "outer" labels and tick labels. x-labels are only kept for subplots on the last row; y-labels only for subplots on the first column. """ lastrow = self.is_last_row() firstcol = self.is_first_col() if not lastrow: for label in self.get_xticklabels(which="both"): label.set_visible(False) self.get_xaxis().get_offset_text().set_visible(False) self.set_xlabel("") if not firstcol: for label in self.get_yticklabels(which="both"): label.set_visible(False) self.get_yaxis().get_offset_text().set_visible(False) self.set_ylabel("")
def _make_twin_axes(self, *args, **kwargs): """Make a twinx axes of self. This is used for twinx and twiny.""" if 'sharex' in kwargs and 'sharey' in kwargs: # The following line is added in v2.2 to avoid breaking Seaborn, # which currently uses this internal API. if kwargs["sharex"] is not self and kwargs["sharey"] is not self: raise ValueError("Twinned Axes may share only one axis") # The dance here with label is to force add_subplot() to create a new # Axes (by passing in a label never seen before). Note that this does # not affect plot reactivation by subplot() as twin axes can never be # reactivated by subplot(). sentinel = str(uuid.uuid4()) real_label = kwargs.pop("label", sentinel) twin = self.figure.add_subplot( self.get_subplotspec(), *args, label=sentinel, **kwargs) if real_label is not sentinel: twin.set_label(real_label) self.set_adjustable('datalim') twin.set_adjustable('datalim') if self._layoutbox is not None and twin._layoutbox is not None: # make the layout boxes be explicitly the same twin._layoutbox.constrain_same(self._layoutbox) twin._poslayoutbox.constrain_same(self._poslayoutbox) self._twinned_axes.join(self, twin) return twin
[docs] def __repr__(self): fields = [] if self.get_label(): fields += [f"label={self.get_label()!r}"] titles = [] for k in ["left", "center", "right"]: title = self.get_title(loc=k) if title: titles.append(f"{k!r}:{title!r}") if titles: fields += ["title={" + ",".join(titles) + "}"] if self.get_xlabel(): fields += [f"xlabel={self.get_xlabel()!r}"] if self.get_ylabel(): fields += [f"ylabel={self.get_ylabel()!r}"] return f"<{self.__class__.__name__}:" + ", ".join(fields) + ">"
# this here to support cartopy which was using a private part of the # API to register their Axes subclasses. # In 3.1 this should be changed to a dict subclass that warns on use # In 3.3 to a dict subclass that raises a useful exception on use # In 3.4 should be removed # The slow timeline is to give cartopy enough time to get several # release out before we break them. _subplot_classes = {}
[docs]@functools.lru_cache(None) def subplot_class_factory(axes_class=None): """ Make a new class that inherits from `.SubplotBase` and the given axes_class (which is assumed to be a subclass of `.axes.Axes`). This is perhaps a little bit roundabout to make a new class on the fly like this, but it means that a new Subplot class does not have to be created for every type of Axes. """ if axes_class is None: cbook.warn_deprecated( "3.3", message="Support for passing None to subplot_class_factory " "is deprecated since %(since)s; explicitly pass the default Axes " "class instead. This will become an error %(removal)s.") axes_class = Axes try: # Avoid creating two different instances of GeoAxesSubplot... # Only a temporary backcompat fix. This should be removed in # 3.4 return next(cls for cls in SubplotBase.__subclasses__() if cls.__bases__ == (SubplotBase, axes_class)) except StopIteration: return type("%sSubplot" % axes_class.__name__, (SubplotBase, axes_class), {'_axes_class': axes_class})
Subplot = subplot_class_factory(Axes) # Provided for backward compatibility. def _picklable_subplot_class_constructor(axes_class): """ Stub factory that returns an empty instance of the appropriate subplot class when called with an axes class. This is purely to allow pickling of Axes and Subplots. """ subplot_class = subplot_class_factory(axes_class) return subplot_class.__new__(subplot_class) docstring.interpd.update(Axes=martist.kwdoc(Axes)) docstring.dedent_interpd(Axes.__init__) docstring.interpd.update(Subplot=martist.kwdoc(Axes))