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        Label a contour plot.

        Adds labels to line contours in this `.ContourSet` (which inherits from
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        levels : array-like, optional
            A list of level values, that should be labeled. The list must be
            a subset of ``cs.levels``. If not given, all levels are labeled.

        fontsize : str or float, default: :rc:`font.size`
            Size in points or relative size e.g., 'smaller', 'x-large'.
            See `.Text.set_size` for accepted string values.

        colors : :mpltype:`color` or colors or None, default: None
            The label colors:

            - If *None*, the color of each label matches the color of
              the corresponding contour.

            - If one string color, e.g., *colors* = 'r' or *colors* =
              'red', all labels will be plotted in this color.

            - If a tuple of colors (string, float, RGB, etc), different labels
              will be plotted in different colors in the order specified.

        inline : bool, default: True
            If ``True`` the underlying contour is removed where the label is
            placed.

        inline_spacing : float, default: 5
            Space in pixels to leave on each side of label when placing inline.

            This spacing will be exact for labels at locations where the
            contour is straight, less so for labels on curved contours.

        fmt : `.Formatter` or str or callable or dict, optional
            How the levels are formatted:

            - If a `.Formatter`, it is used to format all levels at once, using
              its `.Formatter.format_ticks` method.
            - If a str, it is interpreted as a %-style format string.
            - If a callable, it is called with one level at a time and should
              return the corresponding label.
            - If a dict, it should directly map levels to labels.

            The default is to use a standard `.ScalarFormatter`.

        manual : bool or iterable, default: False
            If ``True``, contour labels will be placed manually using
            mouse clicks. Click the first button near a contour to
            add a label, click the second button (or potentially both
            mouse buttons at once) to finish adding labels. The third
            button can be used to remove the last label added, but
            only if labels are not inline. Alternatively, the keyboard
            can be used to select label locations (enter to end label
            placement, delete or backspace act like the third mouse button,
            and any other key will select a label location).

            *manual* can also be an iterable object of (x, y) tuples.
            Contour labels will be created as if mouse is clicked at each
            (x, y) position.

        rightside_up : bool, default: True
            If ``True``, label rotations will always be plus
            or minus 90 degrees from level.

        use_clabeltext : bool, default: False
            If ``True``, use `.Text.set_transform_rotates_text` to ensure that
            label rotation is updated whenever the Axes aspect changes.

        zorder : float or None, default: ``(2 + contour.get_zorder())``
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        Returns
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        screen_pos : (float, float)
            The position where the label will be inserted, in screen space.
        lw : float
            The label width, in screen space.
        spacing : float
            Extra spacing around the label, in screen space.

        Returns
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        path : Path
            The path, broken so that the label can be drawn over it.
        angle : float
            The rotation of the label.

        Notes
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        The method used here involves computing the path length along the contour in
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        Both tasks are done together to avoid calculating path lengths
        multiple times, which is relatively costly.

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        inline_spacing : int, default: 5
            Space in pixels to leave on each side of label when placing
            inline. This spacing will be exact for labels at locations where
            the contour is straight, less so for labels on curved contours.
        transform : `.Transform` or `False`, default: ``self.axes.transData``
            A transform applied to ``(x, y)`` before labeling.  The default
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    Parameters
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    xys : (N, 2) array-like
        Coordinates of vertices.
    p : (float, float)
        Coordinates of point.

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    d2min : float
        Minimum square distance of *p* to *xys*.
    proj : (float, float)
        Projection of *p* onto *xys*.
    imin : (int, int)
        Consecutive indices of vertices of segment in *xys* where *proj* is.
        Segments are considered as including their end-points; i.e. if the
        closest point on the path is a node in *xys* with index *i*, this
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    The Axes object in which the contours are drawn.

collections : `.silent_list` of `.PathCollection`\s
    The `.Artist`\s representing the contour. This is a list of
    `.PathCollection`\s for both line and filled contours.

levels : array
    The values of the contour levels.

layers : array
    Same as levels for line contours; half-way between
    levels for filled contours.  See ``ContourSet._process_colors``.
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        A list of floating point numbers indicating the contour levels.

    allsegs : [level0segs, level1segs, ...]
        List of all the polygon segments for all the *levels*.
        For contour lines ``len(allsegs) == len(levels)``, and for
        filled contour regions ``len(allsegs) = len(levels)-1``. The lists
        should look like ::

            level0segs = [polygon0, polygon1, ...]
            polygon0 = [[x0, y0], [x1, y1], ...]

    allkinds : ``None`` or [level0kinds, level1kinds, ...]
        Optional list of all the polygon vertex kinds (code types), as
        described and used in Path. This is used to allow multiply-
        connected paths such as holes within filled polygons.
        If not ``None``, ``len(allkinds) == len(allsegs)``. The lists
        should look like ::

            level0kinds = [polygon0kinds, ...]
            polygon0kinds = [vertexcode0, vertexcode1, ...]

        If *allkinds* is not ``None``, usually all polygons for a
        particular contour level are grouped together so that
        ``level0segs = [polygon0]`` and ``level0kinds = [polygon0kinds]``.

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    The height values over which the contour is drawn.  Color-mapping is
    controlled by *cmap*, *norm*, *vmin*, and *vmax*.

levels : int or array-like, optional
    Determines the number and positions of the contour lines / regions.

    If an int *n*, use `~matplotlib.ticker.MaxNLocator`, which tries
    to automatically choose no more than *n+1* "nice" contour levels
    between minimum and maximum numeric values of *Z*.

    If array-like, draw contour lines at the specified levels.
    The values must be in increasing order.

Returns
-------
`~.contour.QuadContourSet`

Other Parameters
----------------
corner_mask : bool, default: :rc:`contour.corner_mask`
    Enable/disable corner masking, which only has an effect if *Z* is
    a masked array.  If ``False``, any quad touching a masked point is
    masked out.  If ``True``, only the triangular corners of quads
    nearest those points are always masked out, other triangular
    corners comprising three unmasked points are contoured as usual.

colors : :mpltype:`color` or list of :mpltype:`color`, optional
    The colors of the levels, i.e. the lines for `.contour` and the
    areas for `.contourf`.

    The sequence is cycled for the levels in ascending order. If the
    sequence is shorter than the number of levels, it's repeated.

    As a shortcut, single color strings may be used in place of
    one-element lists, i.e. ``'red'`` instead of ``['red']`` to color
    all levels with the same color. This shortcut does only work for
    color strings, not for other ways of specifying colors.

    By default (value *None*), the colormap specified by *cmap*
    will be used.

alpha : float, default: 1
    The alpha blending value, between 0 (transparent) and 1 (opaque).

%(cmap_doc)s

    This parameter is ignored if *colors* is set.

%(norm_doc)s

    This parameter is ignored if *colors* is set.

%(vmin_vmax_doc)s

    If *vmin* or *vmax* are not given, the default color scaling is based on
    *levels*.

    This parameter is ignored if *colors* is set.

origin : {*None*, 'upper', 'lower', 'image'}, default: None
    Determines the orientation and exact position of *Z* by specifying
    the position of ``Z[0, 0]``.  This is only relevant, if *X*, *Y*
    are not given.

    - *None*: ``Z[0, 0]`` is at X=0, Y=0 in the lower left corner.
    - 'lower': ``Z[0, 0]`` is at X=0.5, Y=0.5 in the lower left corner.
    - 'upper': ``Z[0, 0]`` is at X=N+0.5, Y=0.5 in the upper left
      corner.
    - 'image': Use the value from :rc:`image.origin`.

extent : (x0, x1, y0, y1), optional
    If *origin* is not *None*, then *extent* is interpreted as in
    `.imshow`: it gives the outer pixel boundaries. In this case, the
    position of Z[0, 0] is the center of the pixel, not a corner. If
    *origin* is *None*, then (*x0*, *y0*) is the position of Z[0, 0],
    and (*x1*, *y1*) is the position of Z[-1, -1].

    This argument is ignored if *X* and *Y* are specified in the call
    to contour.

locator : ticker.Locator subclass, optional
    The locator is used to determine the contour levels if they
    are not given explicitly via *levels*.
    Defaults to `~.ticker.MaxNLocator`.

extend : {'neither', 'both', 'min', 'max'}, default: 'neither'
    Determines the ``contourf``-coloring of values that are outside the
    *levels* range.

    If 'neither', values outside the *levels* range are not colored.
    If 'min', 'max' or 'both', color the values below, above or below
    and above the *levels* range.

    Values below ``min(levels)`` and above ``max(levels)`` are mapped
    to the under/over values of the `.Colormap`. Note that most
    colormaps do not have dedicated colors for these by default, so
    that the over and under values are the edge values of the colormap.
    You may want to set these values explicitly using
    `.Colormap.set_under` and `.Colormap.set_over`.

    .. note::

        An existing `.QuadContourSet` does not get notified if
        properties of its colormap are changed. Therefore, an explicit
        call `.QuadContourSet.changed()` is needed after modifying the
        colormap. The explicit call can be left out, if a colorbar is
        assigned to the `.QuadContourSet` because it internally calls
        `.QuadContourSet.changed()`.

    Example::

        x = np.arange(1, 10)
        y = x.reshape(-1, 1)
        h = x * y

        cs = plt.contourf(h, levels=[10, 30, 50],
            colors=['#808080', '#A0A0A0', '#C0C0C0'], extend='both')
        cs.cmap.set_over('red')
        cs.cmap.set_under('blue')
        cs.changed()

xunits, yunits : registered units, optional
    Override axis units by specifying an instance of a
    :class:`matplotlib.units.ConversionInterface`.

antialiased : bool, optional
    Enable antialiasing, overriding the defaults.  For
    filled contours, the default is *False*.  For line contours,
    it is taken from :rc:`lines.antialiased`.

nchunk : int >= 0, optional
    If 0, no subdivision of the domain.  Specify a positive integer to
    divide the domain into subdomains of *nchunk* by *nchunk* quads.
    Chunking reduces the maximum length of polygons generated by the
    contouring algorithm which reduces the rendering workload passed
    on to the backend and also requires slightly less RAM.  It can
    however introduce rendering artifacts at chunk boundaries depending
    on the backend, the *antialiased* flag and value of *alpha*.

linewidths : float or array-like, default: :rc:`contour.linewidth`
    *Only applies to* `.contour`.

    The line width of the contour lines.

    If a number, all levels will be plotted with this linewidth.

    If a sequence, the levels in ascending order will be plotted with
    the linewidths in the order specified.

    If None, this falls back to :rc:`lines.linewidth`.

linestyles : {*None*, 'solid', 'dashed', 'dashdot', 'dotted'}, optional
    *Only applies to* `.contour`.

    If *linestyles* is *None*, the default is 'solid' unless the lines are
    monochrome. In that case, negative contours will instead take their
    linestyle from the *negative_linestyles* argument.

    *linestyles* can also be an iterable of the above strings specifying a set
    of linestyles to be used. If this iterable is shorter than the number of
    contour levels it will be repeated as necessary.

negative_linestyles : {*None*, 'solid', 'dashed', 'dashdot', 'dotted'},                        optional
    *Only applies to* `.contour`.

    If *linestyles* is *None* and the lines are monochrome, this argument
    specifies the line style for negative contours.

    If *negative_linestyles* is *None*, the default is taken from
    :rc:`contour.negative_linestyles`.

    *negative_linestyles* can also be an iterable of the above strings
    specifying a set of linestyles to be used. If this iterable is shorter than
    the number of contour levels it will be repeated as necessary.

hatches : list[str], optional
    *Only applies to* `.contourf`.

    A list of cross hatch patterns to use on the filled areas.
    If None, no hatching will be added to the contour.

algorithm : {'mpl2005', 'mpl2014', 'serial', 'threaded'}, optional
    Which contouring algorithm to use to calculate the contour lines and
    polygons. The algorithms are implemented in
    `ContourPy <https://github.com/contourpy/contourpy>`_, consult the
    `ContourPy documentation <https://contourpy.readthedocs.io>`_ for
    further information.

    The default is taken from :rc:`contour.algorithm`.

clip_path : `~matplotlib.patches.Patch` or `.Path` or `.TransformedPath`
    Set the clip path.  See `~matplotlib.artist.Artist.set_clip_path`.

    .. versionadded:: 3.8

data : indexable object, optional
    DATA_PARAMETER_PLACEHOLDER

Notes
-----
1. `.contourf` differs from the MATLAB version in that it does not draw
   the polygon edges. To draw edges, add line contours with calls to
   `.contour`.

2. `.contourf` fills intervals that are closed at the top; that is, for
   boundaries *z1* and *z2*, the filled region is::

      z1 < Z <= z2

   except for the lowest interval, which is closed on both sides (i.e.
   it includes the lowest value).

3. `.contour` and `.contourf` use a `marching squares
   <https://en.wikipedia.org/wiki/Marching_squares>`_ algorithm to
   compute contour locations.  More information can be found in
   `ContourPy documentation <https://contourpy.readthedocs.io>`_.
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