587 lines
21 KiB
Python
587 lines
21 KiB
Python
from collections.abc import MutableMapping
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import functools
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import numpy as np
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import matplotlib
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from matplotlib import _api, docstring, rcParams
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from matplotlib.artist import allow_rasterization
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import matplotlib.transforms as mtransforms
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import matplotlib.patches as mpatches
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import matplotlib.path as mpath
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class Spine(mpatches.Patch):
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"""
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An axis spine -- the line noting the data area boundaries.
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Spines are the lines connecting the axis tick marks and noting the
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boundaries of the data area. They can be placed at arbitrary
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positions. See `~.Spine.set_position` for more information.
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The default position is ``('outward', 0)``.
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Spines are subclasses of `.Patch`, and inherit much of their behavior.
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Spines draw a line, a circle, or an arc depending if
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`~.Spine.set_patch_line`, `~.Spine.set_patch_circle`, or
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`~.Spine.set_patch_arc` has been called. Line-like is the default.
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"""
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def __str__(self):
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return "Spine"
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@docstring.dedent_interpd
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def __init__(self, axes, spine_type, path, **kwargs):
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"""
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Parameters
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----------
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axes : `~matplotlib.axes.Axes`
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The `~.axes.Axes` instance containing the spine.
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spine_type : str
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The spine type.
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path : `~matplotlib.path.Path`
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The `.Path` instance used to draw the spine.
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Other Parameters
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----------------
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**kwargs
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Valid keyword arguments are:
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%(Patch_kwdoc)s
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"""
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super().__init__(**kwargs)
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self.axes = axes
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self.set_figure(self.axes.figure)
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self.spine_type = spine_type
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self.set_facecolor('none')
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self.set_edgecolor(rcParams['axes.edgecolor'])
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self.set_linewidth(rcParams['axes.linewidth'])
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self.set_capstyle('projecting')
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self.axis = None
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self.set_zorder(2.5)
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self.set_transform(self.axes.transData) # default transform
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self._bounds = None # default bounds
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# Defer initial position determination. (Not much support for
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# non-rectangular axes is currently implemented, and this lets
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# them pass through the spines machinery without errors.)
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self._position = None
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_api.check_isinstance(matplotlib.path.Path, path=path)
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self._path = path
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# To support drawing both linear and circular spines, this
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# class implements Patch behavior three ways. If
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# self._patch_type == 'line', behave like a mpatches.PathPatch
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# instance. If self._patch_type == 'circle', behave like a
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# mpatches.Ellipse instance. If self._patch_type == 'arc', behave like
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# a mpatches.Arc instance.
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self._patch_type = 'line'
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# Behavior copied from mpatches.Ellipse:
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# Note: This cannot be calculated until this is added to an Axes
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self._patch_transform = mtransforms.IdentityTransform()
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def set_patch_arc(self, center, radius, theta1, theta2):
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"""Set the spine to be arc-like."""
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self._patch_type = 'arc'
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self._center = center
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self._width = radius * 2
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self._height = radius * 2
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self._theta1 = theta1
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self._theta2 = theta2
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self._path = mpath.Path.arc(theta1, theta2)
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# arc drawn on axes transform
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self.set_transform(self.axes.transAxes)
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self.stale = True
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def set_patch_circle(self, center, radius):
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"""Set the spine to be circular."""
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self._patch_type = 'circle'
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self._center = center
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self._width = radius * 2
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self._height = radius * 2
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# circle drawn on axes transform
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self.set_transform(self.axes.transAxes)
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self.stale = True
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def set_patch_line(self):
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"""Set the spine to be linear."""
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self._patch_type = 'line'
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self.stale = True
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# Behavior copied from mpatches.Ellipse:
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def _recompute_transform(self):
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"""
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Notes
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-----
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This cannot be called until after this has been added to an Axes,
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otherwise unit conversion will fail. This makes it very important to
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call the accessor method and not directly access the transformation
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member variable.
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"""
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assert self._patch_type in ('arc', 'circle')
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center = (self.convert_xunits(self._center[0]),
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self.convert_yunits(self._center[1]))
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width = self.convert_xunits(self._width)
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height = self.convert_yunits(self._height)
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self._patch_transform = mtransforms.Affine2D() \
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.scale(width * 0.5, height * 0.5) \
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.translate(*center)
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def get_patch_transform(self):
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if self._patch_type in ('arc', 'circle'):
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self._recompute_transform()
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return self._patch_transform
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else:
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return super().get_patch_transform()
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def get_window_extent(self, renderer=None):
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"""
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Return the window extent of the spines in display space, including
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padding for ticks (but not their labels)
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See Also
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--------
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matplotlib.axes.Axes.get_tightbbox
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matplotlib.axes.Axes.get_window_extent
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"""
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# make sure the location is updated so that transforms etc are correct:
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self._adjust_location()
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bb = super().get_window_extent(renderer=renderer)
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if self.axis is None:
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return bb
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bboxes = [bb]
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tickstocheck = [self.axis.majorTicks[0]]
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if len(self.axis.minorTicks) > 1:
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# only pad for minor ticks if there are more than one
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# of them. There is always one...
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tickstocheck.append(self.axis.minorTicks[1])
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for tick in tickstocheck:
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bb0 = bb.frozen()
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tickl = tick._size
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tickdir = tick._tickdir
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if tickdir == 'out':
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padout = 1
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padin = 0
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elif tickdir == 'in':
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padout = 0
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padin = 1
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else:
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padout = 0.5
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padin = 0.5
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padout = padout * tickl / 72 * self.figure.dpi
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padin = padin * tickl / 72 * self.figure.dpi
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if tick.tick1line.get_visible():
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if self.spine_type == 'left':
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bb0.x0 = bb0.x0 - padout
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bb0.x1 = bb0.x1 + padin
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elif self.spine_type == 'bottom':
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bb0.y0 = bb0.y0 - padout
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bb0.y1 = bb0.y1 + padin
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if tick.tick2line.get_visible():
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if self.spine_type == 'right':
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bb0.x1 = bb0.x1 + padout
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bb0.x0 = bb0.x0 - padin
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elif self.spine_type == 'top':
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bb0.y1 = bb0.y1 + padout
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bb0.y0 = bb0.y0 - padout
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bboxes.append(bb0)
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return mtransforms.Bbox.union(bboxes)
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def get_path(self):
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return self._path
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def _ensure_position_is_set(self):
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if self._position is None:
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# default position
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self._position = ('outward', 0.0) # in points
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self.set_position(self._position)
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def register_axis(self, axis):
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"""
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Register an axis.
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An axis should be registered with its corresponding spine from
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the Axes instance. This allows the spine to clear any axis
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properties when needed.
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"""
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self.axis = axis
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if self.axis is not None:
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self.axis.clear()
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self.stale = True
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def clear(self):
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"""Clear the current spine."""
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self._position = None # clear position
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if self.axis is not None:
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self.axis.clear()
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@_api.deprecated("3.4", alternative="Spine.clear()")
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def cla(self):
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self.clear()
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def _adjust_location(self):
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"""Automatically set spine bounds to the view interval."""
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if self.spine_type == 'circle':
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return
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if self._bounds is not None:
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low, high = self._bounds
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elif self.spine_type in ('left', 'right'):
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low, high = self.axes.viewLim.intervaly
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elif self.spine_type in ('top', 'bottom'):
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low, high = self.axes.viewLim.intervalx
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else:
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raise ValueError(f'unknown spine spine_type: {self.spine_type}')
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if self._patch_type == 'arc':
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if self.spine_type in ('bottom', 'top'):
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try:
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direction = self.axes.get_theta_direction()
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except AttributeError:
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direction = 1
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try:
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offset = self.axes.get_theta_offset()
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except AttributeError:
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offset = 0
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low = low * direction + offset
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high = high * direction + offset
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if low > high:
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low, high = high, low
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self._path = mpath.Path.arc(np.rad2deg(low), np.rad2deg(high))
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if self.spine_type == 'bottom':
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rmin, rmax = self.axes.viewLim.intervaly
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try:
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rorigin = self.axes.get_rorigin()
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except AttributeError:
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rorigin = rmin
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scaled_diameter = (rmin - rorigin) / (rmax - rorigin)
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self._height = scaled_diameter
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self._width = scaled_diameter
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else:
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raise ValueError('unable to set bounds for spine "%s"' %
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self.spine_type)
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else:
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v1 = self._path.vertices
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assert v1.shape == (2, 2), 'unexpected vertices shape'
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if self.spine_type in ['left', 'right']:
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v1[0, 1] = low
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v1[1, 1] = high
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elif self.spine_type in ['bottom', 'top']:
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v1[0, 0] = low
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v1[1, 0] = high
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else:
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raise ValueError('unable to set bounds for spine "%s"' %
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self.spine_type)
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@allow_rasterization
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def draw(self, renderer):
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self._adjust_location()
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ret = super().draw(renderer)
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self.stale = False
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return ret
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def set_position(self, position):
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"""
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Set the position of the spine.
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Spine position is specified by a 2 tuple of (position type,
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amount). The position types are:
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* 'outward': place the spine out from the data area by the specified
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number of points. (Negative values place the spine inwards.)
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* 'axes': place the spine at the specified Axes coordinate (0 to 1).
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* 'data': place the spine at the specified data coordinate.
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Additionally, shorthand notations define a special positions:
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* 'center' -> ('axes', 0.5)
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* 'zero' -> ('data', 0.0)
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"""
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if position in ('center', 'zero'): # special positions
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pass
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else:
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if len(position) != 2:
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raise ValueError("position should be 'center' or 2-tuple")
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if position[0] not in ['outward', 'axes', 'data']:
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raise ValueError("position[0] should be one of 'outward', "
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"'axes', or 'data' ")
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self._position = position
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self.set_transform(self.get_spine_transform())
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if self.axis is not None:
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self.axis.reset_ticks()
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self.stale = True
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def get_position(self):
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"""Return the spine position."""
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self._ensure_position_is_set()
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return self._position
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def get_spine_transform(self):
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"""Return the spine transform."""
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self._ensure_position_is_set()
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position = self._position
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if isinstance(position, str):
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if position == 'center':
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position = ('axes', 0.5)
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elif position == 'zero':
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position = ('data', 0)
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assert len(position) == 2, 'position should be 2-tuple'
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position_type, amount = position
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_api.check_in_list(['axes', 'outward', 'data'],
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position_type=position_type)
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if self.spine_type in ['left', 'right']:
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base_transform = self.axes.get_yaxis_transform(which='grid')
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elif self.spine_type in ['top', 'bottom']:
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base_transform = self.axes.get_xaxis_transform(which='grid')
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else:
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raise ValueError(f'unknown spine spine_type: {self.spine_type!r}')
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if position_type == 'outward':
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if amount == 0: # short circuit commonest case
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return base_transform
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else:
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offset_vec = {'left': (-1, 0), 'right': (1, 0),
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'bottom': (0, -1), 'top': (0, 1),
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}[self.spine_type]
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# calculate x and y offset in dots
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offset_dots = amount * np.array(offset_vec) / 72
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return (base_transform
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+ mtransforms.ScaledTranslation(
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*offset_dots, self.figure.dpi_scale_trans))
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elif position_type == 'axes':
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if self.spine_type in ['left', 'right']:
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# keep y unchanged, fix x at amount
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return (mtransforms.Affine2D.from_values(0, 0, 0, 1, amount, 0)
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+ base_transform)
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elif self.spine_type in ['bottom', 'top']:
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# keep x unchanged, fix y at amount
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return (mtransforms.Affine2D.from_values(1, 0, 0, 0, 0, amount)
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+ base_transform)
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elif position_type == 'data':
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if self.spine_type in ('right', 'top'):
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# The right and top spines have a default position of 1 in
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# axes coordinates. When specifying the position in data
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# coordinates, we need to calculate the position relative to 0.
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amount -= 1
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if self.spine_type in ('left', 'right'):
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return mtransforms.blended_transform_factory(
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mtransforms.Affine2D().translate(amount, 0)
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+ self.axes.transData,
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self.axes.transData)
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elif self.spine_type in ('bottom', 'top'):
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return mtransforms.blended_transform_factory(
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self.axes.transData,
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mtransforms.Affine2D().translate(0, amount)
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+ self.axes.transData)
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def set_bounds(self, low=None, high=None):
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"""
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Set the spine bounds.
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Parameters
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----------
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low : float or None, optional
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The lower spine bound. Passing *None* leaves the limit unchanged.
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The bounds may also be passed as the tuple (*low*, *high*) as the
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first positional argument.
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.. ACCEPTS: (low: float, high: float)
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high : float or None, optional
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The higher spine bound. Passing *None* leaves the limit unchanged.
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"""
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if self.spine_type == 'circle':
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raise ValueError(
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'set_bounds() method incompatible with circular spines')
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if high is None and np.iterable(low):
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low, high = low
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old_low, old_high = self.get_bounds() or (None, None)
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if low is None:
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low = old_low
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if high is None:
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high = old_high
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self._bounds = (low, high)
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self.stale = True
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def get_bounds(self):
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"""Get the bounds of the spine."""
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return self._bounds
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@classmethod
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def linear_spine(cls, axes, spine_type, **kwargs):
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"""Create and return a linear `Spine`."""
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# all values of 0.999 get replaced upon call to set_bounds()
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if spine_type == 'left':
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path = mpath.Path([(0.0, 0.999), (0.0, 0.999)])
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elif spine_type == 'right':
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path = mpath.Path([(1.0, 0.999), (1.0, 0.999)])
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elif spine_type == 'bottom':
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path = mpath.Path([(0.999, 0.0), (0.999, 0.0)])
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elif spine_type == 'top':
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path = mpath.Path([(0.999, 1.0), (0.999, 1.0)])
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else:
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raise ValueError('unable to make path for spine "%s"' % spine_type)
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result = cls(axes, spine_type, path, **kwargs)
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result.set_visible(rcParams['axes.spines.{0}'.format(spine_type)])
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return result
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@classmethod
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def arc_spine(cls, axes, spine_type, center, radius, theta1, theta2,
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**kwargs):
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"""Create and return an arc `Spine`."""
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path = mpath.Path.arc(theta1, theta2)
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result = cls(axes, spine_type, path, **kwargs)
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result.set_patch_arc(center, radius, theta1, theta2)
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return result
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@classmethod
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def circular_spine(cls, axes, center, radius, **kwargs):
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"""Create and return a circular `Spine`."""
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path = mpath.Path.unit_circle()
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spine_type = 'circle'
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result = cls(axes, spine_type, path, **kwargs)
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result.set_patch_circle(center, radius)
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return result
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def set_color(self, c):
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"""
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Set the edgecolor.
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Parameters
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----------
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c : color
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Notes
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-----
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This method does not modify the facecolor (which defaults to "none"),
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unlike the `.Patch.set_color` method defined in the parent class. Use
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`.Patch.set_facecolor` to set the facecolor.
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"""
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self.set_edgecolor(c)
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self.stale = True
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class SpinesProxy:
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"""
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A proxy to broadcast ``set_*`` method calls to all contained `.Spines`.
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The proxy cannot be used for any other operations on its members.
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The supported methods are determined dynamically based on the contained
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spines. If not all spines support a given method, it's executed only on
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the subset of spines that support it.
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"""
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def __init__(self, spine_dict):
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self._spine_dict = spine_dict
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def __getattr__(self, name):
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broadcast_targets = [spine for spine in self._spine_dict.values()
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if hasattr(spine, name)]
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if not name.startswith('set_') or not broadcast_targets:
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raise AttributeError(
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f"'SpinesProxy' object has no attribute '{name}'")
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def x(_targets, _funcname, *args, **kwargs):
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for spine in _targets:
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getattr(spine, _funcname)(*args, **kwargs)
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x = functools.partial(x, broadcast_targets, name)
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x.__doc__ = broadcast_targets[0].__doc__
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return x
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def __dir__(self):
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names = []
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for spine in self._spine_dict.values():
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names.extend(name
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for name in dir(spine) if name.startswith('set_'))
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return list(sorted(set(names)))
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class Spines(MutableMapping):
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r"""
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The container of all `.Spine`\s in an Axes.
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The interface is dict-like mapping names (e.g. 'left') to `.Spine` objects.
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Additionally it implements some pandas.Series-like features like accessing
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elements by attribute::
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spines['top'].set_visible(False)
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spines.top.set_visible(False)
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Multiple spines can be addressed simultaneously by passing a list::
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spines[['top', 'right']].set_visible(False)
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Use an open slice to address all spines::
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spines[:].set_visible(False)
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The latter two indexing methods will return a `SpinesProxy` that broadcasts
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all ``set_*`` calls to its members, but cannot be used for any other
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operation.
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"""
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def __init__(self, **kwargs):
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self._dict = kwargs
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@classmethod
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def from_dict(cls, d):
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return cls(**d)
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def __getstate__(self):
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return self._dict
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def __setstate__(self, state):
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self.__init__(**state)
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def __getattr__(self, name):
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try:
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return self._dict[name]
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except KeyError:
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raise ValueError(
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f"'Spines' object does not contain a '{name}' spine")
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def __getitem__(self, key):
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if isinstance(key, list):
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unknown_keys = [k for k in key if k not in self._dict]
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if unknown_keys:
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raise KeyError(', '.join(unknown_keys))
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return SpinesProxy({k: v for k, v in self._dict.items()
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if k in key})
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if isinstance(key, tuple):
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raise ValueError('Multiple spines must be passed as a single list')
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if isinstance(key, slice):
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if key.start is None and key.stop is None and key.step is None:
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return SpinesProxy(self._dict)
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else:
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raise ValueError(
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'Spines does not support slicing except for the fully '
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'open slice [:] to access all spines.')
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return self._dict[key]
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def __setitem__(self, key, value):
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# TODO: Do we want to deprecate adding spines?
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self._dict[key] = value
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def __delitem__(self, key):
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# TODO: Do we want to deprecate deleting spines?
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del self._dict[key]
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def __iter__(self):
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return iter(self._dict)
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def __len__(self):
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return len(self._dict)
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