305 lines
10 KiB
Python
305 lines
10 KiB
Python
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import numpy as np
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from matplotlib import _api
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import matplotlib.docstring as docstring
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import matplotlib.ticker as mticker
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from matplotlib.axes._base import _AxesBase, _TransformedBoundsLocator
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class SecondaryAxis(_AxesBase):
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"""
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General class to hold a Secondary_X/Yaxis.
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"""
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def __init__(self, parent, orientation, location, functions, **kwargs):
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"""
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See `.secondary_xaxis` and `.secondary_yaxis` for the doc string.
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While there is no need for this to be private, it should really be
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called by those higher level functions.
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"""
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self._functions = functions
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self._parent = parent
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self._orientation = orientation
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self._ticks_set = False
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if self._orientation == 'x':
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super().__init__(self._parent.figure, [0, 1., 1, 0.0001], **kwargs)
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self._axis = self.xaxis
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self._locstrings = ['top', 'bottom']
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self._otherstrings = ['left', 'right']
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elif self._orientation == 'y':
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super().__init__(self._parent.figure, [0, 1., 0.0001, 1], **kwargs)
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self._axis = self.yaxis
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self._locstrings = ['right', 'left']
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self._otherstrings = ['top', 'bottom']
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self._parentscale = None
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# this gets positioned w/o constrained_layout so exclude:
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self.set_location(location)
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self.set_functions(functions)
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# styling:
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if self._orientation == 'x':
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otheraxis = self.yaxis
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else:
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otheraxis = self.xaxis
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otheraxis.set_major_locator(mticker.NullLocator())
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otheraxis.set_ticks_position('none')
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self.spines[self._otherstrings].set_visible(False)
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self.spines[self._locstrings].set_visible(True)
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if self._pos < 0.5:
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# flip the location strings...
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self._locstrings = self._locstrings[::-1]
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self.set_alignment(self._locstrings[0])
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def set_alignment(self, align):
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"""
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Set if axes spine and labels are drawn at top or bottom (or left/right)
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of the axes.
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Parameters
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----------
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align : str
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either 'top' or 'bottom' for orientation='x' or
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'left' or 'right' for orientation='y' axis.
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"""
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_api.check_in_list(self._locstrings, align=align)
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if align == self._locstrings[1]: # Need to change the orientation.
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self._locstrings = self._locstrings[::-1]
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self.spines[self._locstrings[0]].set_visible(True)
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self.spines[self._locstrings[1]].set_visible(False)
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self._axis.set_ticks_position(align)
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self._axis.set_label_position(align)
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def set_location(self, location):
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"""
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Set the vertical or horizontal location of the axes in
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parent-normalized coordinates.
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Parameters
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----------
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location : {'top', 'bottom', 'left', 'right'} or float
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The position to put the secondary axis. Strings can be 'top' or
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'bottom' for orientation='x' and 'right' or 'left' for
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orientation='y'. A float indicates the relative position on the
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parent axes to put the new axes, 0.0 being the bottom (or left)
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and 1.0 being the top (or right).
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"""
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# This puts the rectangle into figure-relative coordinates.
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if isinstance(location, str):
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if location in ['top', 'right']:
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self._pos = 1.
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elif location in ['bottom', 'left']:
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self._pos = 0.
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else:
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raise ValueError(
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f"location must be {self._locstrings[0]!r}, "
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f"{self._locstrings[1]!r}, or a float, not {location!r}")
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else:
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self._pos = location
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self._loc = location
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if self._orientation == 'x':
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# An x-secondary axes is like an inset axes from x = 0 to x = 1 and
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# from y = pos to y = pos + eps, in the parent's transAxes coords.
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bounds = [0, self._pos, 1., 1e-10]
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else:
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bounds = [self._pos, 0, 1e-10, 1]
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# this locator lets the axes move in the parent axes coordinates.
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# so it never needs to know where the parent is explicitly in
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# figure coordinates.
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# it gets called in ax.apply_aspect() (of all places)
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self.set_axes_locator(
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_TransformedBoundsLocator(bounds, self._parent.transAxes))
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def apply_aspect(self, position=None):
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# docstring inherited.
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self._set_lims()
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super().apply_aspect(position)
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def set_ticks(self, ticks, *, minor=False):
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"""
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Set the x ticks with list of *ticks*
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Parameters
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----------
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ticks : list
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List of x-axis tick locations.
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minor : bool, default: False
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If ``False`` sets major ticks, if ``True`` sets minor ticks.
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"""
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ret = self._axis.set_ticks(ticks, minor=minor)
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self.stale = True
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self._ticks_set = True
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return ret
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def set_functions(self, functions):
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"""
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Set how the secondary axis converts limits from the parent axes.
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Parameters
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----------
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functions : 2-tuple of func, or `Transform` with an inverse.
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Transform between the parent axis values and the secondary axis
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values.
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If supplied as a 2-tuple of functions, the first function is
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the forward transform function and the second is the inverse
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transform.
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If a transform is supplied, then the transform must have an
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inverse.
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"""
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if (isinstance(functions, tuple) and len(functions) == 2 and
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callable(functions[0]) and callable(functions[1])):
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# make an arbitrary convert from a two-tuple of functions
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# forward and inverse.
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self._functions = functions
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elif functions is None:
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self._functions = (lambda x: x, lambda x: x)
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else:
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raise ValueError('functions argument of secondary axes '
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'must be a two-tuple of callable functions '
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'with the first function being the transform '
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'and the second being the inverse')
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self._set_scale()
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# Should be changed to draw(self, renderer) once the deprecation of
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# renderer=None and of inframe expires.
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def draw(self, *args, **kwargs):
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"""
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Draw the secondary axes.
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Consults the parent axes for its limits and converts them
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using the converter specified by
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`~.axes._secondary_axes.set_functions` (or *functions*
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parameter when axes initialized.)
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"""
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self._set_lims()
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# this sets the scale in case the parent has set its scale.
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self._set_scale()
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super().draw(*args, **kwargs)
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def _set_scale(self):
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"""
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Check if parent has set its scale
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"""
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if self._orientation == 'x':
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pscale = self._parent.xaxis.get_scale()
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set_scale = self.set_xscale
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if self._orientation == 'y':
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pscale = self._parent.yaxis.get_scale()
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set_scale = self.set_yscale
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if pscale == self._parentscale:
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return
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if pscale == 'log':
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defscale = 'functionlog'
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else:
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defscale = 'function'
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if self._ticks_set:
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ticks = self._axis.get_ticklocs()
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# need to invert the roles here for the ticks to line up.
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set_scale(defscale, functions=self._functions[::-1])
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# OK, set_scale sets the locators, but if we've called
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# axsecond.set_ticks, we want to keep those.
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if self._ticks_set:
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self._axis.set_major_locator(mticker.FixedLocator(ticks))
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# If the parent scale doesn't change, we can skip this next time.
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self._parentscale = pscale
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def _set_lims(self):
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"""
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Set the limits based on parent limits and the convert method
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between the parent and this secondary axes.
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"""
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if self._orientation == 'x':
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lims = self._parent.get_xlim()
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set_lim = self.set_xlim
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if self._orientation == 'y':
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lims = self._parent.get_ylim()
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set_lim = self.set_ylim
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order = lims[0] < lims[1]
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lims = self._functions[0](np.array(lims))
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neworder = lims[0] < lims[1]
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if neworder != order:
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# Flip because the transform will take care of the flipping.
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lims = lims[::-1]
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set_lim(lims)
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def set_aspect(self, *args, **kwargs):
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"""
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Secondary axes cannot set the aspect ratio, so calling this just
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sets a warning.
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"""
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_api.warn_external("Secondary axes can't set the aspect ratio")
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def set_color(self, color):
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"""
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Change the color of the secondary axes and all decorators.
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Parameters
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----------
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color : color
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"""
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if self._orientation == 'x':
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self.tick_params(axis='x', colors=color)
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self.spines.bottom.set_color(color)
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self.spines.top.set_color(color)
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self.xaxis.label.set_color(color)
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else:
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self.tick_params(axis='y', colors=color)
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self.spines.left.set_color(color)
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self.spines.right.set_color(color)
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self.yaxis.label.set_color(color)
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_secax_docstring = '''
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Warnings
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--------
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This method is experimental as of 3.1, and the API may change.
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Parameters
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----------
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location : {'top', 'bottom', 'left', 'right'} or float
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The position to put the secondary axis. Strings can be 'top' or
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'bottom' for orientation='x' and 'right' or 'left' for
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orientation='y'. A float indicates the relative position on the
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parent axes to put the new axes, 0.0 being the bottom (or left)
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and 1.0 being the top (or right).
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functions : 2-tuple of func, or Transform with an inverse
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If a 2-tuple of functions, the user specifies the transform
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function and its inverse. i.e.
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``functions=(lambda x: 2 / x, lambda x: 2 / x)`` would be an
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reciprocal transform with a factor of 2.
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The user can also directly supply a subclass of
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`.transforms.Transform` so long as it has an inverse.
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See :doc:`/gallery/subplots_axes_and_figures/secondary_axis`
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for examples of making these conversions.
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Returns
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-------
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ax : axes._secondary_axes.SecondaryAxis
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Other Parameters
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----------------
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**kwargs : `~matplotlib.axes.Axes` properties.
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Other miscellaneous axes parameters.
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'''
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docstring.interpd.update(_secax_docstring=_secax_docstring)
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