def __init__(
        self,
        figsize=None,  # defaults to rc figure.figsize
        dpi=None,  # defaults to rc figure.dpi
        facecolor=None,  # defaults to rc figure.facecolor
        edgecolor=None,  # defaults to rc figure.edgecolor
        linewidth=0.0,  # the default linewidth of the frame
        frameon=True,  # whether or not to draw the figure frame
        subplotpars=None,  # default to rc
    ):
        """
        *figsize*
            w,h tuple in inches

        *dpi*
            Dots per inch

        *facecolor*
            The figure patch facecolor; defaults to rc ``figure.facecolor``

        *edgecolor*
            The figure patch edge color; defaults to rc ``figure.edgecolor``

        *linewidth*
            The figure patch edge linewidth; the default linewidth of the frame

        *frameon*
            If *False*, suppress drawing the figure frame

        *subplotpars*
            A :class:`SubplotParams` instance, defaults to rc
        """
        Artist.__init__(self)

        self.callbacks = cbook.CallbackRegistry()

        if figsize is None:
            figsize = rcParams["figure.figsize"]
        if dpi is None:
            dpi = rcParams["figure.dpi"]
        if facecolor is None:
            facecolor = rcParams["figure.facecolor"]
        if edgecolor is None:
            edgecolor = rcParams["figure.edgecolor"]

        self.dpi_scale_trans = Affine2D()
        self.dpi = dpi
        self.bbox_inches = Bbox.from_bounds(0, 0, *figsize)
        self.bbox = TransformedBbox(self.bbox_inches, self.dpi_scale_trans)

        self.frameon = frameon

        self.transFigure = BboxTransformTo(self.bbox)

        # the figurePatch name is deprecated
        self.patch = self.figurePatch = Rectangle(
            xy=(0, 0), width=1, height=1, facecolor=facecolor, edgecolor=edgecolor, linewidth=linewidth
        )
        self._set_artist_props(self.patch)
        self.patch.set_aa(False)

        self._hold = rcParams["axes.hold"]
        self.canvas = None

        if subplotpars is None:
            subplotpars = SubplotParams()

        self.subplotpars = subplotpars

        self._axstack = AxesStack()  # track all figure axes and current axes
        self.clf()
        self._cachedRenderer = None

class Figure(Artist):

    """
    The Figure instance supports callbacks through a *callbacks*
    attribute which is a :class:`matplotlib.cbook.CallbackRegistry`
    instance.  The events you can connect to are 'dpi_changed', and
    the callback will be called with ``func(fig)`` where fig is the
    :class:`Figure` instance.

    The figure patch is drawn by a the attribute

    *patch*
       a :class:`matplotlib.patches.Rectangle` instance

    *suppressComposite*
       for multiple figure images, the figure will make composite
       images depending on the renderer option_image_nocomposite
       function.  If suppressComposite is True|False, this will
       override the renderer
    """

    def __str__(self):
        return "Figure(%gx%g)" % tuple(self.bbox.size)

    def __init__(
        self,
        figsize=None,  # defaults to rc figure.figsize
        dpi=None,  # defaults to rc figure.dpi
        facecolor=None,  # defaults to rc figure.facecolor
        edgecolor=None,  # defaults to rc figure.edgecolor
        linewidth=1.0,  # the default linewidth of the frame
        frameon=True,  # whether or not to draw the figure frame
        subplotpars=None,  # default to rc
    ):
        """
        *figsize*
            w,h tuple in inches
        *dpi*
            dots per inch
        *facecolor*
            the figure patch facecolor; defaults to rc ``figure.facecolor``
        *edgecolor*
            the figure patch edge color; defaults to rc ``figure.edgecolor``
        *linewidth*
            the figure patch edge linewidth; the default linewidth of the frame
        *frameon*
            if False, suppress drawing the figure frame
        *subplotpars*
            a :class:`SubplotParams` instance, defaults to rc
        """
        Artist.__init__(self)

        self.callbacks = cbook.CallbackRegistry(("dpi_changed",))

        if figsize is None:
            figsize = rcParams["figure.figsize"]
        if dpi is None:
            dpi = rcParams["figure.dpi"]
        if facecolor is None:
            facecolor = rcParams["figure.facecolor"]
        if edgecolor is None:
            edgecolor = rcParams["figure.edgecolor"]

        self.dpi_scale_trans = Affine2D()
        self.dpi = dpi
        self.bbox_inches = Bbox.from_bounds(0, 0, *figsize)
        self.bbox = TransformedBbox(self.bbox_inches, self.dpi_scale_trans)

        self.frameon = frameon

        self.transFigure = BboxTransformTo(self.bbox)

        # the figurePatch name is deprecated
        self.patch = self.figurePatch = Rectangle(
            xy=(0, 0), width=1, height=1, facecolor=facecolor, edgecolor=edgecolor, linewidth=linewidth
        )
        self._set_artist_props(self.patch)

        self._hold = rcParams["axes.hold"]
        self.canvas = None

        if subplotpars is None:
            subplotpars = SubplotParams()

        self.subplotpars = subplotpars

        self._axstack = Stack()  # maintain the current axes
        self.axes = []
        self.clf()
        self._cachedRenderer = None

    def _get_dpi(self):
        return self._dpi

    def _set_dpi(self, dpi):
        self._dpi = dpi
        self.dpi_scale_trans.clear().scale(dpi, dpi)
        self.callbacks.process("dpi_changed", self)

    dpi = property(_get_dpi, _set_dpi)
#.........这里部分代码省略.........