302 lines
12 KiB
Python
302 lines
12 KiB
Python
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"""
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Routines to adjust subplot params so that subplots are
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nicely fit in the figure. In doing so, only axis labels, tick labels, Axes
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titles and offsetboxes that are anchored to Axes are currently considered.
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Internally, this module assumes that the margins (left margin, etc.) which are
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differences between ``Axes.get_tightbbox`` and ``Axes.bbox`` are independent of
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Axes position. This may fail if ``Axes.adjustable`` is ``datalim`` as well as
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such cases as when left or right margin are affected by xlabel.
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"""
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import numpy as np
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import matplotlib as mpl
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from matplotlib import _api, artist as martist
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from matplotlib.font_manager import FontProperties
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from matplotlib.transforms import Bbox
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def _auto_adjust_subplotpars(
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fig, renderer, shape, span_pairs, subplot_list,
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ax_bbox_list=None, pad=1.08, h_pad=None, w_pad=None, rect=None):
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"""
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Return a dict of subplot parameters to adjust spacing between subplots
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or ``None`` if resulting Axes would have zero height or width.
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Note that this function ignores geometry information of subplot itself, but
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uses what is given by the *shape* and *subplot_list* parameters. Also, the
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results could be incorrect if some subplots have ``adjustable=datalim``.
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Parameters
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----------
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shape : tuple[int, int]
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Number of rows and columns of the grid.
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span_pairs : list[tuple[slice, slice]]
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List of rowspans and colspans occupied by each subplot.
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subplot_list : list of subplots
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List of subplots that will be used to calculate optimal subplot_params.
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pad : float
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Padding between the figure edge and the edges of subplots, as a
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fraction of the font size.
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h_pad, w_pad : float
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Padding (height/width) between edges of adjacent subplots, as a
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fraction of the font size. Defaults to *pad*.
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rect : tuple
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(left, bottom, right, top), default: None.
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"""
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rows, cols = shape
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font_size_inch = (FontProperties(
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size=mpl.rcParams["font.size"]).get_size_in_points() / 72)
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pad_inch = pad * font_size_inch
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vpad_inch = h_pad * font_size_inch if h_pad is not None else pad_inch
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hpad_inch = w_pad * font_size_inch if w_pad is not None else pad_inch
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if len(span_pairs) != len(subplot_list) or len(subplot_list) == 0:
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raise ValueError
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if rect is None:
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margin_left = margin_bottom = margin_right = margin_top = None
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else:
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margin_left, margin_bottom, _right, _top = rect
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margin_right = 1 - _right if _right else None
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margin_top = 1 - _top if _top else None
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vspaces = np.zeros((rows + 1, cols))
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hspaces = np.zeros((rows, cols + 1))
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if ax_bbox_list is None:
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ax_bbox_list = [
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Bbox.union([ax.get_position(original=True) for ax in subplots])
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for subplots in subplot_list]
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for subplots, ax_bbox, (rowspan, colspan) in zip(
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subplot_list, ax_bbox_list, span_pairs):
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if all(not ax.get_visible() for ax in subplots):
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continue
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bb = []
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for ax in subplots:
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if ax.get_visible():
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bb += [martist._get_tightbbox_for_layout_only(ax, renderer)]
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tight_bbox_raw = Bbox.union(bb)
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tight_bbox = fig.transFigure.inverted().transform_bbox(tight_bbox_raw)
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hspaces[rowspan, colspan.start] += ax_bbox.xmin - tight_bbox.xmin # l
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hspaces[rowspan, colspan.stop] += tight_bbox.xmax - ax_bbox.xmax # r
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vspaces[rowspan.start, colspan] += tight_bbox.ymax - ax_bbox.ymax # t
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vspaces[rowspan.stop, colspan] += ax_bbox.ymin - tight_bbox.ymin # b
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fig_width_inch, fig_height_inch = fig.get_size_inches()
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# margins can be negative for Axes with aspect applied, so use max(, 0) to
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# make them nonnegative.
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if not margin_left:
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margin_left = max(hspaces[:, 0].max(), 0) + pad_inch/fig_width_inch
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suplabel = fig._supylabel
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if suplabel and suplabel.get_in_layout():
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rel_width = fig.transFigure.inverted().transform_bbox(
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suplabel.get_window_extent(renderer)).width
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margin_left += rel_width + pad_inch/fig_width_inch
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if not margin_right:
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margin_right = max(hspaces[:, -1].max(), 0) + pad_inch/fig_width_inch
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if not margin_top:
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margin_top = max(vspaces[0, :].max(), 0) + pad_inch/fig_height_inch
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if fig._suptitle and fig._suptitle.get_in_layout():
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rel_height = fig.transFigure.inverted().transform_bbox(
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fig._suptitle.get_window_extent(renderer)).height
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margin_top += rel_height + pad_inch/fig_height_inch
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if not margin_bottom:
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margin_bottom = max(vspaces[-1, :].max(), 0) + pad_inch/fig_height_inch
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suplabel = fig._supxlabel
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if suplabel and suplabel.get_in_layout():
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rel_height = fig.transFigure.inverted().transform_bbox(
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suplabel.get_window_extent(renderer)).height
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margin_bottom += rel_height + pad_inch/fig_height_inch
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if margin_left + margin_right >= 1:
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_api.warn_external('Tight layout not applied. The left and right '
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'margins cannot be made large enough to '
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'accommodate all Axes decorations.')
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return None
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if margin_bottom + margin_top >= 1:
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_api.warn_external('Tight layout not applied. The bottom and top '
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'margins cannot be made large enough to '
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'accommodate all Axes decorations.')
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return None
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kwargs = dict(left=margin_left,
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right=1 - margin_right,
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bottom=margin_bottom,
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top=1 - margin_top)
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if cols > 1:
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hspace = hspaces[:, 1:-1].max() + hpad_inch / fig_width_inch
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# axes widths:
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h_axes = (1 - margin_right - margin_left - hspace * (cols - 1)) / cols
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if h_axes < 0:
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_api.warn_external('Tight layout not applied. tight_layout '
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'cannot make Axes width small enough to '
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'accommodate all Axes decorations')
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return None
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else:
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kwargs["wspace"] = hspace / h_axes
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if rows > 1:
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vspace = vspaces[1:-1, :].max() + vpad_inch / fig_height_inch
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v_axes = (1 - margin_top - margin_bottom - vspace * (rows - 1)) / rows
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if v_axes < 0:
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_api.warn_external('Tight layout not applied. tight_layout '
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'cannot make Axes height small enough to '
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'accommodate all Axes decorations.')
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return None
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else:
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kwargs["hspace"] = vspace / v_axes
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return kwargs
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def get_subplotspec_list(axes_list, grid_spec=None):
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"""
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Return a list of subplotspec from the given list of Axes.
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For an instance of Axes that does not support subplotspec, None is inserted
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in the list.
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If grid_spec is given, None is inserted for those not from the given
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grid_spec.
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"""
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subplotspec_list = []
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for ax in axes_list:
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axes_or_locator = ax.get_axes_locator()
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if axes_or_locator is None:
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axes_or_locator = ax
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if hasattr(axes_or_locator, "get_subplotspec"):
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subplotspec = axes_or_locator.get_subplotspec()
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if subplotspec is not None:
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subplotspec = subplotspec.get_topmost_subplotspec()
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gs = subplotspec.get_gridspec()
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if grid_spec is not None:
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if gs != grid_spec:
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subplotspec = None
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elif gs.locally_modified_subplot_params():
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subplotspec = None
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else:
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subplotspec = None
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subplotspec_list.append(subplotspec)
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return subplotspec_list
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def get_tight_layout_figure(fig, axes_list, subplotspec_list, renderer,
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pad=1.08, h_pad=None, w_pad=None, rect=None):
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"""
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Return subplot parameters for tight-layouted-figure with specified padding.
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Parameters
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----------
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fig : Figure
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axes_list : list of Axes
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subplotspec_list : list of `.SubplotSpec`
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The subplotspecs of each Axes.
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renderer : renderer
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pad : float
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Padding between the figure edge and the edges of subplots, as a
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fraction of the font size.
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h_pad, w_pad : float
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Padding (height/width) between edges of adjacent subplots. Defaults to
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*pad*.
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rect : tuple (left, bottom, right, top), default: None.
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rectangle in normalized figure coordinates
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that the whole subplots area (including labels) will fit into.
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Defaults to using the entire figure.
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Returns
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-------
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subplotspec or None
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subplotspec kwargs to be passed to `.Figure.subplots_adjust` or
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None if tight_layout could not be accomplished.
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"""
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# Multiple Axes can share same subplotspec (e.g., if using axes_grid1);
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# we need to group them together.
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ss_to_subplots = {ss: [] for ss in subplotspec_list}
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for ax, ss in zip(axes_list, subplotspec_list):
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ss_to_subplots[ss].append(ax)
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if ss_to_subplots.pop(None, None):
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_api.warn_external(
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"This figure includes Axes that are not compatible with "
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"tight_layout, so results might be incorrect.")
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if not ss_to_subplots:
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return {}
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subplot_list = list(ss_to_subplots.values())
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ax_bbox_list = [ss.get_position(fig) for ss in ss_to_subplots]
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max_nrows = max(ss.get_gridspec().nrows for ss in ss_to_subplots)
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max_ncols = max(ss.get_gridspec().ncols for ss in ss_to_subplots)
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span_pairs = []
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for ss in ss_to_subplots:
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# The intent here is to support Axes from different gridspecs where
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# one's nrows (or ncols) is a multiple of the other (e.g. 2 and 4),
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# but this doesn't actually work because the computed wspace, in
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# relative-axes-height, corresponds to different physical spacings for
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# the 2-row grid and the 4-row grid. Still, this code is left, mostly
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# for backcompat.
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rows, cols = ss.get_gridspec().get_geometry()
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div_row, mod_row = divmod(max_nrows, rows)
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div_col, mod_col = divmod(max_ncols, cols)
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if mod_row != 0:
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_api.warn_external('tight_layout not applied: number of rows '
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'in subplot specifications must be '
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'multiples of one another.')
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return {}
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if mod_col != 0:
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_api.warn_external('tight_layout not applied: number of '
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'columns in subplot specifications must be '
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'multiples of one another.')
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return {}
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span_pairs.append((
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slice(ss.rowspan.start * div_row, ss.rowspan.stop * div_row),
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slice(ss.colspan.start * div_col, ss.colspan.stop * div_col)))
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kwargs = _auto_adjust_subplotpars(fig, renderer,
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shape=(max_nrows, max_ncols),
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span_pairs=span_pairs,
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subplot_list=subplot_list,
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ax_bbox_list=ax_bbox_list,
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pad=pad, h_pad=h_pad, w_pad=w_pad)
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# kwargs can be none if tight_layout fails...
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if rect is not None and kwargs is not None:
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# if rect is given, the whole subplots area (including
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# labels) will fit into the rect instead of the
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# figure. Note that the rect argument of
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# *auto_adjust_subplotpars* specify the area that will be
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# covered by the total area of axes.bbox. Thus we call
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# auto_adjust_subplotpars twice, where the second run
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# with adjusted rect parameters.
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left, bottom, right, top = rect
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if left is not None:
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left += kwargs["left"]
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if bottom is not None:
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bottom += kwargs["bottom"]
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if right is not None:
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right -= (1 - kwargs["right"])
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if top is not None:
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top -= (1 - kwargs["top"])
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kwargs = _auto_adjust_subplotpars(fig, renderer,
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shape=(max_nrows, max_ncols),
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span_pairs=span_pairs,
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subplot_list=subplot_list,
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ax_bbox_list=ax_bbox_list,
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pad=pad, h_pad=h_pad, w_pad=w_pad,
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rect=(left, bottom, right, top))
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return kwargs
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