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lib64
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python3.6
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matplotlib
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axes
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Filename :
_secondary_axes.py
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import numpy as np import matplotlib.cbook as cbook import matplotlib.docstring as docstring import matplotlib.ticker as mticker import matplotlib.transforms as mtransforms from matplotlib.axes._base import _AxesBase def _make_secondary_locator(rect, parent): """ Helper function to locate the secondary axes. A locator gets used in `Axes.set_aspect` to override the default locations... It is a function that takes an axes object and a renderer and tells `set_aspect` where it is to be placed. This locator make the transform be in axes-relative co-coordinates because that is how we specify the "location" of the secondary axes. Here *rect* is a rectangle [l, b, w, h] that specifies the location for the axes in the transform given by *trans* on the *parent*. """ _rect = mtransforms.Bbox.from_bounds(*rect) def secondary_locator(ax, renderer): # delay evaluating transform until draw time because the # parent transform may have changed (i.e. if window reesized) bb = mtransforms.TransformedBbox(_rect, parent.transAxes) tr = parent.figure.transFigure.inverted() bb = mtransforms.TransformedBbox(bb, tr) return bb return secondary_locator class SecondaryAxis(_AxesBase): """ General class to hold a Secondary_X/Yaxis. """ def __init__(self, parent, orientation, location, functions, **kwargs): """ See `.secondary_xaxis` and `.secondary_yaxis` for the doc string. While there is no need for this to be private, it should really be called by those higher level functions. """ self._functions = functions self._parent = parent self._orientation = orientation self._ticks_set = False if self._orientation == 'x': super().__init__(self._parent.figure, [0, 1., 1, 0.0001], **kwargs) self._axis = self.xaxis self._locstrings = ['top', 'bottom'] self._otherstrings = ['left', 'right'] elif self._orientation == 'y': super().__init__(self._parent.figure, [0, 1., 0.0001, 1], **kwargs) self._axis = self.yaxis self._locstrings = ['right', 'left'] self._otherstrings = ['top', 'bottom'] self._parentscale = None # this gets positioned w/o constrained_layout so exclude: self._layoutbox = None self._poslayoutbox = None self.set_location(location) self.set_functions(functions) # styling: if self._orientation == 'x': otheraxis = self.yaxis else: otheraxis = self.xaxis otheraxis.set_major_locator(mticker.NullLocator()) otheraxis.set_ticks_position('none') for st in self._otherstrings: self.spines[st].set_visible(False) for st in self._locstrings: self.spines[st].set_visible(True) if self._pos < 0.5: # flip the location strings... self._locstrings = self._locstrings[::-1] self.set_alignment(self._locstrings[0]) def set_alignment(self, align): """ Set if axes spine and labels are drawn at top or bottom (or left/right) of the axes. Parameters ---------- align : str either 'top' or 'bottom' for orientation='x' or 'left' or 'right' for orientation='y' axis. """ cbook._check_in_list(self._locstrings, align=align) if align == self._locstrings[1]: # Need to change the orientation. self._locstrings = self._locstrings[::-1] self.spines[self._locstrings[0]].set_visible(True) self.spines[self._locstrings[1]].set_visible(False) self._axis.set_ticks_position(align) self._axis.set_label_position(align) def set_location(self, location): """ Set the vertical or horizontal location of the axes in parent-normalized coordinates. Parameters ---------- location : {'top', 'bottom', 'left', 'right'} or float The position to put the secondary axis. Strings can be 'top' or 'bottom' for orientation='x' and 'right' or 'left' for orientation='y'. A float indicates the relative position on the parent axes to put the new axes, 0.0 being the bottom (or left) and 1.0 being the top (or right). """ # This puts the rectangle into figure-relative coordinates. if isinstance(location, str): if location in ['top', 'right']: self._pos = 1. elif location in ['bottom', 'left']: self._pos = 0. else: raise ValueError( f"location must be {self._locstrings[0]!r}, " f"{self._locstrings[1]!r}, or a float, not {location!r}") else: self._pos = location self._loc = location if self._orientation == 'x': bounds = [0, self._pos, 1., 1e-10] else: bounds = [self._pos, 0, 1e-10, 1] secondary_locator = _make_secondary_locator(bounds, self._parent) # this locator lets the axes move in the parent axes coordinates. # so it never needs to know where the parent is explicitly in # figure coordinates. # it gets called in `ax.apply_aspect() (of all places) self.set_axes_locator(secondary_locator) def apply_aspect(self, position=None): # docstring inherited. self._set_lims() super().apply_aspect(position) @cbook._make_keyword_only("3.2", "minor") def set_ticks(self, ticks, minor=False): """ Set the x ticks with list of *ticks* Parameters ---------- ticks : list List of x-axis tick locations. minor : bool, default: False If ``False`` sets major ticks, if ``True`` sets minor ticks. """ ret = self._axis.set_ticks(ticks, minor=minor) self.stale = True self._ticks_set = True return ret def set_functions(self, functions): """ Set how the secondary axis converts limits from the parent axes. Parameters ---------- functions : 2-tuple of func, or `Transform` with an inverse. Transform between the parent axis values and the secondary axis values. If supplied as a 2-tuple of functions, the first function is the forward transform function and the second is the inverse transform. If a transform is supplied, then the transform must have an inverse. """ if (isinstance(functions, tuple) and len(functions) == 2 and callable(functions[0]) and callable(functions[1])): # make an arbitrary convert from a two-tuple of functions # forward and inverse. self._functions = functions elif functions is None: self._functions = (lambda x: x, lambda x: x) else: raise ValueError('functions argument of secondary axes ' 'must be a two-tuple of callable functions ' 'with the first function being the transform ' 'and the second being the inverse') self._set_scale() # Should be changed to draw(self, renderer) once the deprecation of # renderer=None and of inframe expires. def draw(self, *args, **kwargs): """ Draw the secondary axes. Consults the parent axes for its limits and converts them using the converter specified by `~.axes._secondary_axes.set_functions` (or *functions* parameter when axes initialized.) """ self._set_lims() # this sets the scale in case the parent has set its scale. self._set_scale() super().draw(*args, **kwargs) def _set_scale(self): """ Check if parent has set its scale """ if self._orientation == 'x': pscale = self._parent.xaxis.get_scale() set_scale = self.set_xscale if self._orientation == 'y': pscale = self._parent.yaxis.get_scale() set_scale = self.set_yscale if pscale == self._parentscale: return if pscale == 'log': defscale = 'functionlog' else: defscale = 'function' if self._ticks_set: ticks = self._axis.get_ticklocs() # need to invert the roles here for the ticks to line up. set_scale(defscale, functions=self._functions[::-1]) # OK, set_scale sets the locators, but if we've called # axsecond.set_ticks, we want to keep those. if self._ticks_set: self._axis.set_major_locator(mticker.FixedLocator(ticks)) # If the parent scale doesn't change, we can skip this next time. self._parentscale = pscale def _set_lims(self): """ Set the limits based on parent limits and the convert method between the parent and this secondary axes. """ if self._orientation == 'x': lims = self._parent.get_xlim() set_lim = self.set_xlim if self._orientation == 'y': lims = self._parent.get_ylim() set_lim = self.set_ylim order = lims[0] < lims[1] lims = self._functions[0](np.array(lims)) neworder = lims[0] < lims[1] if neworder != order: # Flip because the transform will take care of the flipping. lims = lims[::-1] set_lim(lims) def set_aspect(self, *args, **kwargs): """ Secondary axes cannot set the aspect ratio, so calling this just sets a warning. """ cbook._warn_external("Secondary axes can't set the aspect ratio") def set_xlabel(self, xlabel, fontdict=None, labelpad=None, **kwargs): """ Set the label for the x-axis. Parameters ---------- xlabel : str The label text. labelpad : float, default: ``self.xaxis.labelpad`` Spacing in points between the label and the x-axis. Other Parameters ---------------- **kwargs : `.Text` properties `.Text` properties control the appearance of the label. See Also -------- text : Documents the properties supported by `.Text`. """ if labelpad is not None: self.xaxis.labelpad = labelpad return self.xaxis.set_label_text(xlabel, fontdict, **kwargs) def set_ylabel(self, ylabel, fontdict=None, labelpad=None, **kwargs): """ Set the label for the y-axis. Parameters ---------- ylabel : str The label text. labelpad : float, default: ``self.yaxis.labelpad`` Spacing in points between the label and the y-axis. Other Parameters ---------------- **kwargs : `.Text` properties `.Text` properties control the appearance of the label. See Also -------- text : Documents the properties supported by `.Text`. """ if labelpad is not None: self.yaxis.labelpad = labelpad return self.yaxis.set_label_text(ylabel, fontdict, **kwargs) def set_color(self, color): """ Change the color of the secondary axes and all decorators. Parameters ---------- color : color """ if self._orientation == 'x': self.tick_params(axis='x', colors=color) self.spines['bottom'].set_color(color) self.spines['top'].set_color(color) self.xaxis.label.set_color(color) else: self.tick_params(axis='y', colors=color) self.spines['left'].set_color(color) self.spines['right'].set_color(color) self.yaxis.label.set_color(color) _secax_docstring = ''' Warnings -------- This method is experimental as of 3.1, and the API may change. Parameters ---------- location : {'top', 'bottom', 'left', 'right'} or float The position to put the secondary axis. Strings can be 'top' or 'bottom' for orientation='x' and 'right' or 'left' for orientation='y'. A float indicates the relative position on the parent axes to put the new axes, 0.0 being the bottom (or left) and 1.0 being the top (or right). functions : 2-tuple of func, or Transform with an inverse If a 2-tuple of functions, the user specifies the transform function and its inverse. i.e. ``functions=(lambda x: 2 / x, lambda x: 2 / x)`` would be an reciprocal transform with a factor of 2. The user can also directly supply a subclass of `.transforms.Transform` so long as it has an inverse. See :doc:`/gallery/subplots_axes_and_figures/secondary_axis` for examples of making these conversions. Returns ------- ax : axes._secondary_axes.SecondaryAxis Other Parameters ---------------- **kwargs : `~matplotlib.axes.Axes` properties. Other miscellaneous axes parameters. ''' docstring.interpd.update(_secax_docstring=_secax_docstring)