532 lines
18 KiB
Python
532 lines
18 KiB
Python
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"""
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Axislines includes modified implementation of the Axes class. The
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biggest difference is that the artists responsible for drawing the axis spine,
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ticks, ticklabels and axis labels are separated out from Matplotlib's Axis
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class. Originally, this change was motivated to support curvilinear
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grid. Here are a few reasons that I came up with a new axes class:
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* "top" and "bottom" x-axis (or "left" and "right" y-axis) can have
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different ticks (tick locations and labels). This is not possible
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with the current Matplotlib, although some twin axes trick can help.
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* Curvilinear grid.
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* angled ticks.
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In the new axes class, xaxis and yaxis is set to not visible by
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default, and new set of artist (AxisArtist) are defined to draw axis
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line, ticks, ticklabels and axis label. Axes.axis attribute serves as
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a dictionary of these artists, i.e., ax.axis["left"] is a AxisArtist
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instance responsible to draw left y-axis. The default Axes.axis contains
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"bottom", "left", "top" and "right".
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AxisArtist can be considered as a container artist and has the following
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children artists which will draw ticks, labels, etc.
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* line
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* major_ticks, major_ticklabels
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* minor_ticks, minor_ticklabels
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* offsetText
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* label
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Note that these are separate artists from `matplotlib.axis.Axis`, thus most
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tick-related functions in Matplotlib won't work. For example, color and
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markerwidth of the ``ax.axis["bottom"].major_ticks`` will follow those of
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Axes.xaxis unless explicitly specified.
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In addition to AxisArtist, the Axes will have *gridlines* attribute,
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which obviously draws grid lines. The gridlines needs to be separated
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from the axis as some gridlines can never pass any axis.
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"""
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import numpy as np
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import matplotlib as mpl
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from matplotlib import _api
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import matplotlib.axes as maxes
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from matplotlib.path import Path
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from mpl_toolkits.axes_grid1 import mpl_axes
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from .axisline_style import AxislineStyle # noqa
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from .axis_artist import AxisArtist, GridlinesCollection
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class _AxisArtistHelperBase:
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"""
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Base class for axis helper.
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Subclasses should define the methods listed below. The *axes*
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argument will be the ``.axes`` attribute of the caller artist. ::
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# Construct the spine.
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def get_line_transform(self, axes):
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return transform
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def get_line(self, axes):
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return path
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# Construct the label.
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def get_axislabel_transform(self, axes):
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return transform
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def get_axislabel_pos_angle(self, axes):
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return (x, y), angle
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# Construct the ticks.
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def get_tick_transform(self, axes):
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return transform
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def get_tick_iterators(self, axes):
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# A pair of iterables (one for major ticks, one for minor ticks)
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# that yield (tick_position, tick_angle, tick_label).
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return iter_major, iter_minor
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"""
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def update_lim(self, axes):
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pass
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def _to_xy(self, values, const):
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"""
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Create a (*values.shape, 2)-shape array representing (x, y) pairs.
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The other coordinate is filled with the constant *const*.
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Example::
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>>> self.nth_coord = 0
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>>> self._to_xy([1, 2, 3], const=0)
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array([[1, 0],
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[2, 0],
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[3, 0]])
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"""
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if self.nth_coord == 0:
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return np.stack(np.broadcast_arrays(values, const), axis=-1)
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elif self.nth_coord == 1:
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return np.stack(np.broadcast_arrays(const, values), axis=-1)
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else:
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raise ValueError("Unexpected nth_coord")
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class _FixedAxisArtistHelperBase(_AxisArtistHelperBase):
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"""Helper class for a fixed (in the axes coordinate) axis."""
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passthru_pt = _api.deprecated("3.7")(property(
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lambda self: {"left": (0, 0), "right": (1, 0),
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"bottom": (0, 0), "top": (0, 1)}[self._loc]))
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def __init__(self, loc, nth_coord=None):
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"""``nth_coord = 0``: x-axis; ``nth_coord = 1``: y-axis."""
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self.nth_coord = (
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nth_coord if nth_coord is not None else
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_api.check_getitem(
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{"bottom": 0, "top": 0, "left": 1, "right": 1}, loc=loc))
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if (nth_coord == 0 and loc not in ["left", "right"]
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or nth_coord == 1 and loc not in ["bottom", "top"]):
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_api.warn_deprecated(
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"3.7", message=f"{loc=!r} is incompatible with "
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"{nth_coord=}; support is deprecated since %(since)s")
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self._loc = loc
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self._pos = {"bottom": 0, "top": 1, "left": 0, "right": 1}[loc]
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super().__init__()
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# axis line in transAxes
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self._path = Path(self._to_xy((0, 1), const=self._pos))
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def get_nth_coord(self):
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return self.nth_coord
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# LINE
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def get_line(self, axes):
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return self._path
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def get_line_transform(self, axes):
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return axes.transAxes
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# LABEL
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def get_axislabel_transform(self, axes):
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return axes.transAxes
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def get_axislabel_pos_angle(self, axes):
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"""
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Return the label reference position in transAxes.
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get_label_transform() returns a transform of (transAxes+offset)
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"""
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return dict(left=((0., 0.5), 90), # (position, angle_tangent)
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right=((1., 0.5), 90),
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bottom=((0.5, 0.), 0),
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top=((0.5, 1.), 0))[self._loc]
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# TICK
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def get_tick_transform(self, axes):
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return [axes.get_xaxis_transform(),
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axes.get_yaxis_transform()][self.nth_coord]
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class _FloatingAxisArtistHelperBase(_AxisArtistHelperBase):
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def __init__(self, nth_coord, value):
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self.nth_coord = nth_coord
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self._value = value
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super().__init__()
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def get_nth_coord(self):
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return self.nth_coord
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def get_line(self, axes):
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raise RuntimeError(
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"get_line method should be defined by the derived class")
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class FixedAxisArtistHelperRectilinear(_FixedAxisArtistHelperBase):
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def __init__(self, axes, loc, nth_coord=None):
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"""
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nth_coord = along which coordinate value varies
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in 2D, nth_coord = 0 -> x axis, nth_coord = 1 -> y axis
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"""
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super().__init__(loc, nth_coord)
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self.axis = [axes.xaxis, axes.yaxis][self.nth_coord]
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# TICK
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def get_tick_iterators(self, axes):
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"""tick_loc, tick_angle, tick_label"""
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if self._loc in ["bottom", "top"]:
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angle_normal, angle_tangent = 90, 0
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else: # "left", "right"
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angle_normal, angle_tangent = 0, 90
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major = self.axis.major
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major_locs = major.locator()
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major_labels = major.formatter.format_ticks(major_locs)
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minor = self.axis.minor
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minor_locs = minor.locator()
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minor_labels = minor.formatter.format_ticks(minor_locs)
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tick_to_axes = self.get_tick_transform(axes) - axes.transAxes
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def _f(locs, labels):
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for loc, label in zip(locs, labels):
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c = self._to_xy(loc, const=self._pos)
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# check if the tick point is inside axes
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c2 = tick_to_axes.transform(c)
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if mpl.transforms._interval_contains_close(
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(0, 1), c2[self.nth_coord]):
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yield c, angle_normal, angle_tangent, label
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return _f(major_locs, major_labels), _f(minor_locs, minor_labels)
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class FloatingAxisArtistHelperRectilinear(_FloatingAxisArtistHelperBase):
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def __init__(self, axes, nth_coord,
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passingthrough_point, axis_direction="bottom"):
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super().__init__(nth_coord, passingthrough_point)
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self._axis_direction = axis_direction
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self.axis = [axes.xaxis, axes.yaxis][self.nth_coord]
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def get_line(self, axes):
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fixed_coord = 1 - self.nth_coord
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data_to_axes = axes.transData - axes.transAxes
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p = data_to_axes.transform([self._value, self._value])
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return Path(self._to_xy((0, 1), const=p[fixed_coord]))
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def get_line_transform(self, axes):
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return axes.transAxes
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def get_axislabel_transform(self, axes):
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return axes.transAxes
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def get_axislabel_pos_angle(self, axes):
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"""
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Return the label reference position in transAxes.
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get_label_transform() returns a transform of (transAxes+offset)
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"""
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angle = [0, 90][self.nth_coord]
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fixed_coord = 1 - self.nth_coord
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data_to_axes = axes.transData - axes.transAxes
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p = data_to_axes.transform([self._value, self._value])
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verts = self._to_xy(0.5, const=p[fixed_coord])
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if 0 <= verts[fixed_coord] <= 1:
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return verts, angle
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else:
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return None, None
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def get_tick_transform(self, axes):
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return axes.transData
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def get_tick_iterators(self, axes):
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"""tick_loc, tick_angle, tick_label"""
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if self.nth_coord == 0:
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angle_normal, angle_tangent = 90, 0
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else:
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angle_normal, angle_tangent = 0, 90
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major = self.axis.major
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major_locs = major.locator()
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major_labels = major.formatter.format_ticks(major_locs)
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minor = self.axis.minor
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minor_locs = minor.locator()
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minor_labels = minor.formatter.format_ticks(minor_locs)
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data_to_axes = axes.transData - axes.transAxes
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def _f(locs, labels):
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for loc, label in zip(locs, labels):
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c = self._to_xy(loc, const=self._value)
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c1, c2 = data_to_axes.transform(c)
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if 0 <= c1 <= 1 and 0 <= c2 <= 1:
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yield c, angle_normal, angle_tangent, label
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return _f(major_locs, major_labels), _f(minor_locs, minor_labels)
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class AxisArtistHelper: # Backcompat.
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Fixed = _FixedAxisArtistHelperBase
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Floating = _FloatingAxisArtistHelperBase
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class AxisArtistHelperRectlinear: # Backcompat.
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Fixed = FixedAxisArtistHelperRectilinear
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Floating = FloatingAxisArtistHelperRectilinear
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class GridHelperBase:
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def __init__(self):
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self._old_limits = None
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super().__init__()
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def update_lim(self, axes):
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x1, x2 = axes.get_xlim()
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y1, y2 = axes.get_ylim()
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if self._old_limits != (x1, x2, y1, y2):
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self._update_grid(x1, y1, x2, y2)
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self._old_limits = (x1, x2, y1, y2)
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def _update_grid(self, x1, y1, x2, y2):
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"""Cache relevant computations when the axes limits have changed."""
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def get_gridlines(self, which, axis):
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"""
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Return list of grid lines as a list of paths (list of points).
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Parameters
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----------
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which : {"both", "major", "minor"}
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axis : {"both", "x", "y"}
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"""
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return []
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class GridHelperRectlinear(GridHelperBase):
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def __init__(self, axes):
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super().__init__()
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self.axes = axes
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def new_fixed_axis(self, loc,
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nth_coord=None,
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axis_direction=None,
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offset=None,
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axes=None,
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):
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if axes is None:
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_api.warn_external(
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"'new_fixed_axis' explicitly requires the axes keyword.")
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axes = self.axes
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if axis_direction is None:
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axis_direction = loc
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helper = FixedAxisArtistHelperRectilinear(axes, loc, nth_coord)
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axisline = AxisArtist(axes, helper, offset=offset,
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axis_direction=axis_direction)
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return axisline
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def new_floating_axis(self, nth_coord, value,
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axis_direction="bottom",
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axes=None,
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):
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if axes is None:
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_api.warn_external(
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"'new_floating_axis' explicitly requires the axes keyword.")
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axes = self.axes
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helper = FloatingAxisArtistHelperRectilinear(
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axes, nth_coord, value, axis_direction)
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axisline = AxisArtist(axes, helper, axis_direction=axis_direction)
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axisline.line.set_clip_on(True)
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axisline.line.set_clip_box(axisline.axes.bbox)
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return axisline
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def get_gridlines(self, which="major", axis="both"):
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"""
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Return list of gridline coordinates in data coordinates.
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Parameters
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----------
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which : {"both", "major", "minor"}
|
||
|
|
axis : {"both", "x", "y"}
|
||
|
|
"""
|
||
|
|
_api.check_in_list(["both", "major", "minor"], which=which)
|
||
|
|
_api.check_in_list(["both", "x", "y"], axis=axis)
|
||
|
|
gridlines = []
|
||
|
|
|
||
|
|
if axis in ("both", "x"):
|
||
|
|
locs = []
|
||
|
|
y1, y2 = self.axes.get_ylim()
|
||
|
|
if which in ("both", "major"):
|
||
|
|
locs.extend(self.axes.xaxis.major.locator())
|
||
|
|
if which in ("both", "minor"):
|
||
|
|
locs.extend(self.axes.xaxis.minor.locator())
|
||
|
|
|
||
|
|
for x in locs:
|
||
|
|
gridlines.append([[x, x], [y1, y2]])
|
||
|
|
|
||
|
|
if axis in ("both", "y"):
|
||
|
|
x1, x2 = self.axes.get_xlim()
|
||
|
|
locs = []
|
||
|
|
if self.axes.yaxis._major_tick_kw["gridOn"]:
|
||
|
|
locs.extend(self.axes.yaxis.major.locator())
|
||
|
|
if self.axes.yaxis._minor_tick_kw["gridOn"]:
|
||
|
|
locs.extend(self.axes.yaxis.minor.locator())
|
||
|
|
|
||
|
|
for y in locs:
|
||
|
|
gridlines.append([[x1, x2], [y, y]])
|
||
|
|
|
||
|
|
return gridlines
|
||
|
|
|
||
|
|
|
||
|
|
class Axes(maxes.Axes):
|
||
|
|
|
||
|
|
@_api.deprecated("3.8", alternative="ax.axis")
|
||
|
|
def __call__(self, *args, **kwargs):
|
||
|
|
return maxes.Axes.axis(self.axes, *args, **kwargs)
|
||
|
|
|
||
|
|
def __init__(self, *args, grid_helper=None, **kwargs):
|
||
|
|
self._axisline_on = True
|
||
|
|
self._grid_helper = (grid_helper if grid_helper
|
||
|
|
else GridHelperRectlinear(self))
|
||
|
|
super().__init__(*args, **kwargs)
|
||
|
|
self.toggle_axisline(True)
|
||
|
|
|
||
|
|
def toggle_axisline(self, b=None):
|
||
|
|
if b is None:
|
||
|
|
b = not self._axisline_on
|
||
|
|
if b:
|
||
|
|
self._axisline_on = True
|
||
|
|
self.spines[:].set_visible(False)
|
||
|
|
self.xaxis.set_visible(False)
|
||
|
|
self.yaxis.set_visible(False)
|
||
|
|
else:
|
||
|
|
self._axisline_on = False
|
||
|
|
self.spines[:].set_visible(True)
|
||
|
|
self.xaxis.set_visible(True)
|
||
|
|
self.yaxis.set_visible(True)
|
||
|
|
|
||
|
|
@property
|
||
|
|
def axis(self):
|
||
|
|
return self._axislines
|
||
|
|
|
||
|
|
def clear(self):
|
||
|
|
# docstring inherited
|
||
|
|
|
||
|
|
# Init gridlines before clear() as clear() calls grid().
|
||
|
|
self.gridlines = gridlines = GridlinesCollection(
|
||
|
|
[],
|
||
|
|
colors=mpl.rcParams['grid.color'],
|
||
|
|
linestyles=mpl.rcParams['grid.linestyle'],
|
||
|
|
linewidths=mpl.rcParams['grid.linewidth'])
|
||
|
|
self._set_artist_props(gridlines)
|
||
|
|
gridlines.set_grid_helper(self.get_grid_helper())
|
||
|
|
|
||
|
|
super().clear()
|
||
|
|
|
||
|
|
# clip_path is set after Axes.clear(): that's when a patch is created.
|
||
|
|
gridlines.set_clip_path(self.axes.patch)
|
||
|
|
|
||
|
|
# Init axis artists.
|
||
|
|
self._axislines = mpl_axes.Axes.AxisDict(self)
|
||
|
|
new_fixed_axis = self.get_grid_helper().new_fixed_axis
|
||
|
|
self._axislines.update({
|
||
|
|
loc: new_fixed_axis(loc=loc, axes=self, axis_direction=loc)
|
||
|
|
for loc in ["bottom", "top", "left", "right"]})
|
||
|
|
for axisline in [self._axislines["top"], self._axislines["right"]]:
|
||
|
|
axisline.label.set_visible(False)
|
||
|
|
axisline.major_ticklabels.set_visible(False)
|
||
|
|
axisline.minor_ticklabels.set_visible(False)
|
||
|
|
|
||
|
|
def get_grid_helper(self):
|
||
|
|
return self._grid_helper
|
||
|
|
|
||
|
|
def grid(self, visible=None, which='major', axis="both", **kwargs):
|
||
|
|
"""
|
||
|
|
Toggle the gridlines, and optionally set the properties of the lines.
|
||
|
|
"""
|
||
|
|
# There are some discrepancies in the behavior of grid() between
|
||
|
|
# axes_grid and Matplotlib, because axes_grid explicitly sets the
|
||
|
|
# visibility of the gridlines.
|
||
|
|
super().grid(visible, which=which, axis=axis, **kwargs)
|
||
|
|
if not self._axisline_on:
|
||
|
|
return
|
||
|
|
if visible is None:
|
||
|
|
visible = (self.axes.xaxis._minor_tick_kw["gridOn"]
|
||
|
|
or self.axes.xaxis._major_tick_kw["gridOn"]
|
||
|
|
or self.axes.yaxis._minor_tick_kw["gridOn"]
|
||
|
|
or self.axes.yaxis._major_tick_kw["gridOn"])
|
||
|
|
self.gridlines.set(which=which, axis=axis, visible=visible)
|
||
|
|
self.gridlines.set(**kwargs)
|
||
|
|
|
||
|
|
def get_children(self):
|
||
|
|
if self._axisline_on:
|
||
|
|
children = [*self._axislines.values(), self.gridlines]
|
||
|
|
else:
|
||
|
|
children = []
|
||
|
|
children.extend(super().get_children())
|
||
|
|
return children
|
||
|
|
|
||
|
|
def new_fixed_axis(self, loc, offset=None):
|
||
|
|
gh = self.get_grid_helper()
|
||
|
|
axis = gh.new_fixed_axis(loc,
|
||
|
|
nth_coord=None,
|
||
|
|
axis_direction=None,
|
||
|
|
offset=offset,
|
||
|
|
axes=self,
|
||
|
|
)
|
||
|
|
return axis
|
||
|
|
|
||
|
|
def new_floating_axis(self, nth_coord, value, axis_direction="bottom"):
|
||
|
|
gh = self.get_grid_helper()
|
||
|
|
axis = gh.new_floating_axis(nth_coord, value,
|
||
|
|
axis_direction=axis_direction,
|
||
|
|
axes=self)
|
||
|
|
return axis
|
||
|
|
|
||
|
|
|
||
|
|
class AxesZero(Axes):
|
||
|
|
|
||
|
|
def clear(self):
|
||
|
|
super().clear()
|
||
|
|
new_floating_axis = self.get_grid_helper().new_floating_axis
|
||
|
|
self._axislines.update(
|
||
|
|
xzero=new_floating_axis(
|
||
|
|
nth_coord=0, value=0., axis_direction="bottom", axes=self),
|
||
|
|
yzero=new_floating_axis(
|
||
|
|
nth_coord=1, value=0., axis_direction="left", axes=self),
|
||
|
|
)
|
||
|
|
for k in ["xzero", "yzero"]:
|
||
|
|
self._axislines[k].line.set_clip_path(self.patch)
|
||
|
|
self._axislines[k].set_visible(False)
|
||
|
|
|
||
|
|
|
||
|
|
Subplot = Axes
|
||
|
|
SubplotZero = AxesZero
|