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484 lines
15 KiB
484 lines
15 KiB
# being a bit too dynamic
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from __future__ import annotations
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from math import ceil
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from typing import TYPE_CHECKING
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import warnings
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from matplotlib import ticker
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import matplotlib.table
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import numpy as np
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from pandas.util._exceptions import find_stack_level
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from pandas.core.dtypes.common import is_list_like
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from pandas.core.dtypes.generic import (
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ABCDataFrame,
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ABCIndex,
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ABCSeries,
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)
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if TYPE_CHECKING:
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from collections.abc import (
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Iterable,
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Sequence,
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)
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from matplotlib.axes import Axes
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from matplotlib.axis import Axis
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from matplotlib.figure import Figure
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from matplotlib.lines import Line2D
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from matplotlib.table import Table
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from pandas import (
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DataFrame,
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Series,
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)
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def do_adjust_figure(fig: Figure) -> bool:
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"""Whether fig has constrained_layout enabled."""
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if not hasattr(fig, "get_constrained_layout"):
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return False
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return not fig.get_constrained_layout()
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def maybe_adjust_figure(fig: Figure, *args, **kwargs) -> None:
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"""Call fig.subplots_adjust unless fig has constrained_layout enabled."""
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if do_adjust_figure(fig):
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fig.subplots_adjust(*args, **kwargs)
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def format_date_labels(ax: Axes, rot) -> None:
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# mini version of autofmt_xdate
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for label in ax.get_xticklabels():
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label.set_ha("right")
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label.set_rotation(rot)
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fig = ax.get_figure()
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maybe_adjust_figure(fig, bottom=0.2)
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def table(
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ax, data: DataFrame | Series, rowLabels=None, colLabels=None, **kwargs
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) -> Table:
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if isinstance(data, ABCSeries):
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data = data.to_frame()
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elif isinstance(data, ABCDataFrame):
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pass
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else:
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raise ValueError("Input data must be DataFrame or Series")
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if rowLabels is None:
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rowLabels = data.index
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if colLabels is None:
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colLabels = data.columns
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cellText = data.values
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return matplotlib.table.table(
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ax, cellText=cellText, rowLabels=rowLabels, colLabels=colLabels, **kwargs
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)
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def _get_layout(
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nplots: int,
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layout: tuple[int, int] | None = None,
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layout_type: str = "box",
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) -> tuple[int, int]:
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if layout is not None:
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if not isinstance(layout, (tuple, list)) or len(layout) != 2:
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raise ValueError("Layout must be a tuple of (rows, columns)")
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nrows, ncols = layout
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if nrows == -1 and ncols > 0:
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layout = nrows, ncols = (ceil(nplots / ncols), ncols)
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elif ncols == -1 and nrows > 0:
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layout = nrows, ncols = (nrows, ceil(nplots / nrows))
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elif ncols <= 0 and nrows <= 0:
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msg = "At least one dimension of layout must be positive"
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raise ValueError(msg)
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if nrows * ncols < nplots:
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raise ValueError(
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f"Layout of {nrows}x{ncols} must be larger than required size {nplots}"
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)
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return layout
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if layout_type == "single":
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return (1, 1)
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elif layout_type == "horizontal":
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return (1, nplots)
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elif layout_type == "vertical":
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return (nplots, 1)
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layouts = {1: (1, 1), 2: (1, 2), 3: (2, 2), 4: (2, 2)}
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try:
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return layouts[nplots]
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except KeyError:
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k = 1
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while k**2 < nplots:
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k += 1
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if (k - 1) * k >= nplots:
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return k, (k - 1)
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else:
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return k, k
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# copied from matplotlib/pyplot.py and modified for pandas.plotting
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def create_subplots(
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naxes: int,
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sharex: bool = False,
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sharey: bool = False,
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squeeze: bool = True,
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subplot_kw=None,
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ax=None,
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layout=None,
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layout_type: str = "box",
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**fig_kw,
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):
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"""
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Create a figure with a set of subplots already made.
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This utility wrapper makes it convenient to create common layouts of
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subplots, including the enclosing figure object, in a single call.
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Parameters
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----------
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naxes : int
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Number of required axes. Exceeded axes are set invisible. Default is
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nrows * ncols.
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sharex : bool
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If True, the X axis will be shared amongst all subplots.
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sharey : bool
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If True, the Y axis will be shared amongst all subplots.
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squeeze : bool
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If True, extra dimensions are squeezed out from the returned axis object:
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- if only one subplot is constructed (nrows=ncols=1), the resulting
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single Axis object is returned as a scalar.
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- for Nx1 or 1xN subplots, the returned object is a 1-d numpy object
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array of Axis objects are returned as numpy 1-d arrays.
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- for NxM subplots with N>1 and M>1 are returned as a 2d array.
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If False, no squeezing is done: the returned axis object is always
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a 2-d array containing Axis instances, even if it ends up being 1x1.
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subplot_kw : dict
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Dict with keywords passed to the add_subplot() call used to create each
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subplots.
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ax : Matplotlib axis object, optional
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layout : tuple
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Number of rows and columns of the subplot grid.
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If not specified, calculated from naxes and layout_type
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layout_type : {'box', 'horizontal', 'vertical'}, default 'box'
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Specify how to layout the subplot grid.
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fig_kw : Other keyword arguments to be passed to the figure() call.
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Note that all keywords not recognized above will be
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automatically included here.
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Returns
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-------
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fig, ax : tuple
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- fig is the Matplotlib Figure object
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- ax can be either a single axis object or an array of axis objects if
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more than one subplot was created. The dimensions of the resulting array
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can be controlled with the squeeze keyword, see above.
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Examples
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--------
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x = np.linspace(0, 2*np.pi, 400)
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y = np.sin(x**2)
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# Just a figure and one subplot
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f, ax = plt.subplots()
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ax.plot(x, y)
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ax.set_title('Simple plot')
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# Two subplots, unpack the output array immediately
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f, (ax1, ax2) = plt.subplots(1, 2, sharey=True)
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ax1.plot(x, y)
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ax1.set_title('Sharing Y axis')
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ax2.scatter(x, y)
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# Four polar axes
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plt.subplots(2, 2, subplot_kw=dict(polar=True))
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"""
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import matplotlib.pyplot as plt
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if subplot_kw is None:
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subplot_kw = {}
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if ax is None:
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fig = plt.figure(**fig_kw)
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else:
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if is_list_like(ax):
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if squeeze:
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ax = flatten_axes(ax)
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if layout is not None:
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warnings.warn(
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"When passing multiple axes, layout keyword is ignored.",
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UserWarning,
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stacklevel=find_stack_level(),
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)
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if sharex or sharey:
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warnings.warn(
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"When passing multiple axes, sharex and sharey "
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"are ignored. These settings must be specified when creating axes.",
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UserWarning,
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stacklevel=find_stack_level(),
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)
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if ax.size == naxes:
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fig = ax.flat[0].get_figure()
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return fig, ax
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else:
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raise ValueError(
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f"The number of passed axes must be {naxes}, the "
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"same as the output plot"
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)
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fig = ax.get_figure()
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# if ax is passed and a number of subplots is 1, return ax as it is
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if naxes == 1:
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if squeeze:
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return fig, ax
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else:
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return fig, flatten_axes(ax)
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else:
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warnings.warn(
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"To output multiple subplots, the figure containing "
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"the passed axes is being cleared.",
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UserWarning,
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stacklevel=find_stack_level(),
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)
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fig.clear()
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nrows, ncols = _get_layout(naxes, layout=layout, layout_type=layout_type)
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nplots = nrows * ncols
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# Create empty object array to hold all axes. It's easiest to make it 1-d
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# so we can just append subplots upon creation, and then
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axarr = np.empty(nplots, dtype=object)
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# Create first subplot separately, so we can share it if requested
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ax0 = fig.add_subplot(nrows, ncols, 1, **subplot_kw)
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if sharex:
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subplot_kw["sharex"] = ax0
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if sharey:
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subplot_kw["sharey"] = ax0
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axarr[0] = ax0
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# Note off-by-one counting because add_subplot uses the MATLAB 1-based
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# convention.
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for i in range(1, nplots):
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kwds = subplot_kw.copy()
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# Set sharex and sharey to None for blank/dummy axes, these can
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# interfere with proper axis limits on the visible axes if
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# they share axes e.g. issue #7528
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if i >= naxes:
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kwds["sharex"] = None
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kwds["sharey"] = None
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ax = fig.add_subplot(nrows, ncols, i + 1, **kwds)
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axarr[i] = ax
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if naxes != nplots:
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for ax in axarr[naxes:]:
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ax.set_visible(False)
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handle_shared_axes(axarr, nplots, naxes, nrows, ncols, sharex, sharey)
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if squeeze:
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# Reshape the array to have the final desired dimension (nrow,ncol),
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# though discarding unneeded dimensions that equal 1. If we only have
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# one subplot, just return it instead of a 1-element array.
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if nplots == 1:
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axes = axarr[0]
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else:
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axes = axarr.reshape(nrows, ncols).squeeze()
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else:
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# returned axis array will be always 2-d, even if nrows=ncols=1
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axes = axarr.reshape(nrows, ncols)
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return fig, axes
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def _remove_labels_from_axis(axis: Axis) -> None:
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for t in axis.get_majorticklabels():
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t.set_visible(False)
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# set_visible will not be effective if
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# minor axis has NullLocator and NullFormatter (default)
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if isinstance(axis.get_minor_locator(), ticker.NullLocator):
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axis.set_minor_locator(ticker.AutoLocator())
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if isinstance(axis.get_minor_formatter(), ticker.NullFormatter):
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axis.set_minor_formatter(ticker.FormatStrFormatter(""))
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for t in axis.get_minorticklabels():
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t.set_visible(False)
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axis.get_label().set_visible(False)
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def _has_externally_shared_axis(ax1: Axes, compare_axis: str) -> bool:
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"""
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Return whether an axis is externally shared.
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Parameters
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----------
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ax1 : matplotlib.axes.Axes
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Axis to query.
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compare_axis : str
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`"x"` or `"y"` according to whether the X-axis or Y-axis is being
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compared.
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Returns
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-------
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bool
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`True` if the axis is externally shared. Otherwise `False`.
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Notes
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-----
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If two axes with different positions are sharing an axis, they can be
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referred to as *externally* sharing the common axis.
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If two axes sharing an axis also have the same position, they can be
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referred to as *internally* sharing the common axis (a.k.a twinning).
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_handle_shared_axes() is only interested in axes externally sharing an
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axis, regardless of whether either of the axes is also internally sharing
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with a third axis.
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"""
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if compare_axis == "x":
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axes = ax1.get_shared_x_axes()
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elif compare_axis == "y":
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axes = ax1.get_shared_y_axes()
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else:
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raise ValueError(
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"_has_externally_shared_axis() needs 'x' or 'y' as a second parameter"
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)
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axes = axes.get_siblings(ax1)
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# Retain ax1 and any of its siblings which aren't in the same position as it
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ax1_points = ax1.get_position().get_points()
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for ax2 in axes:
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if not np.array_equal(ax1_points, ax2.get_position().get_points()):
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return True
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return False
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def handle_shared_axes(
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axarr: Iterable[Axes],
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nplots: int,
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naxes: int,
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nrows: int,
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ncols: int,
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sharex: bool,
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sharey: bool,
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) -> None:
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if nplots > 1:
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row_num = lambda x: x.get_subplotspec().rowspan.start
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col_num = lambda x: x.get_subplotspec().colspan.start
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is_first_col = lambda x: x.get_subplotspec().is_first_col()
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if nrows > 1:
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try:
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# first find out the ax layout,
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# so that we can correctly handle 'gaps"
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layout = np.zeros((nrows + 1, ncols + 1), dtype=np.bool_)
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for ax in axarr:
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layout[row_num(ax), col_num(ax)] = ax.get_visible()
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for ax in axarr:
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# only the last row of subplots should get x labels -> all
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# other off layout handles the case that the subplot is
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# the last in the column, because below is no subplot/gap.
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if not layout[row_num(ax) + 1, col_num(ax)]:
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continue
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if sharex or _has_externally_shared_axis(ax, "x"):
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_remove_labels_from_axis(ax.xaxis)
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except IndexError:
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# if gridspec is used, ax.rowNum and ax.colNum may different
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# from layout shape. in this case, use last_row logic
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is_last_row = lambda x: x.get_subplotspec().is_last_row()
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for ax in axarr:
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if is_last_row(ax):
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continue
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if sharex or _has_externally_shared_axis(ax, "x"):
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_remove_labels_from_axis(ax.xaxis)
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if ncols > 1:
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for ax in axarr:
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# only the first column should get y labels -> set all other to
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# off as we only have labels in the first column and we always
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# have a subplot there, we can skip the layout test
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if is_first_col(ax):
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continue
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if sharey or _has_externally_shared_axis(ax, "y"):
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_remove_labels_from_axis(ax.yaxis)
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def flatten_axes(axes: Axes | Sequence[Axes]) -> np.ndarray:
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if not is_list_like(axes):
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return np.array([axes])
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elif isinstance(axes, (np.ndarray, ABCIndex)):
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return np.asarray(axes).ravel()
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return np.array(axes)
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def set_ticks_props(
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axes: Axes | Sequence[Axes],
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xlabelsize: int | None = None,
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xrot=None,
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ylabelsize: int | None = None,
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yrot=None,
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):
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import matplotlib.pyplot as plt
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for ax in flatten_axes(axes):
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if xlabelsize is not None:
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plt.setp(ax.get_xticklabels(), fontsize=xlabelsize)
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if xrot is not None:
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plt.setp(ax.get_xticklabels(), rotation=xrot)
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if ylabelsize is not None:
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plt.setp(ax.get_yticklabels(), fontsize=ylabelsize)
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if yrot is not None:
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plt.setp(ax.get_yticklabels(), rotation=yrot)
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return axes
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def get_all_lines(ax: Axes) -> list[Line2D]:
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lines = ax.get_lines()
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if hasattr(ax, "right_ax"):
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lines += ax.right_ax.get_lines()
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if hasattr(ax, "left_ax"):
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lines += ax.left_ax.get_lines()
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return lines
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def get_xlim(lines: Iterable[Line2D]) -> tuple[float, float]:
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left, right = np.inf, -np.inf
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for line in lines:
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x = line.get_xdata(orig=False)
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left = min(np.nanmin(x), left)
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right = max(np.nanmax(x), right)
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return left, right
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