649 lines
20 KiB
Python
649 lines
20 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 mpl'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 mpl, 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
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has following 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 Axis class of the
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original mpl, thus most of tick-related command in the original mpl
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won't work, although some effort has made to work with. For example,
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color and markerwidth of the ax.axis["bottom"].major_ticks will follow
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those of 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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from matplotlib import cbook, rcParams
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import matplotlib.artist as martist
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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
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from .axis_artist import AxisArtist, GridlinesCollection
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class AxisArtistHelper:
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"""
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AxisArtistHelper should define
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following method with given APIs. Note that the first axes argument
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will be axes attribute of the caller artist.::
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# LINE (spinal line?)
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def get_line(self, axes):
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# path : Path
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return path
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def get_line_transform(self, axes):
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# ...
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# trans : transform
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return trans
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# LABEL
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def get_label_pos(self, axes):
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# x, y : position
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return (x, y), trans
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def get_label_offset_transform(self,
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axes,
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pad_points, fontprops, renderer,
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bboxes,
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):
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# va : vertical alignment
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# ha : horizontal alignment
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# a : angle
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return trans, va, ha, a
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# TICK
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def get_tick_transform(self, axes):
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return trans
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def get_tick_iterators(self, axes):
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# iter : iterable object that yields (c, angle, l) where
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# c, angle, l is position, tick angle, and label
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return iter_major, iter_minor
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"""
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class _Base:
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"""Base class for axis helper."""
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def __init__(self):
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self.delta1, self.delta2 = 0.00001, 0.00001
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def update_lim(self, axes):
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pass
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class Fixed(_Base):
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"""Helper class for a fixed (in the axes coordinate) axis."""
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_default_passthru_pt = dict(left=(0, 0),
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right=(1, 0),
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bottom=(0, 0),
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top=(0, 1))
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def __init__(self, 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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cbook._check_in_list(["left", "right", "bottom", "top"], loc=loc)
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self._loc = loc
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if nth_coord is None:
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if loc in ["left", "right"]:
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nth_coord = 1
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elif loc in ["bottom", "top"]:
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nth_coord = 0
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self.nth_coord = nth_coord
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super().__init__()
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self.passthru_pt = self._default_passthru_pt[loc]
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_verts = np.array([[0., 0.],
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[1., 1.]])
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fixed_coord = 1 - nth_coord
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_verts[:, fixed_coord] = self.passthru_pt[fixed_coord]
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# axis line in transAxes
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self._path = Path(_verts)
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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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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 Floating(_Base):
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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 AxisArtistHelperRectlinear:
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class Fixed(AxisArtistHelper.Fixed):
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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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loc = self._loc
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if loc in ["bottom", "top"]:
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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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majorLocs = major.locator()
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majorLabels = major.formatter.format_ticks(majorLocs)
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minor = self.axis.minor
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minorLocs = minor.locator()
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minorLabels = minor.formatter.format_ticks(minorLocs)
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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 x, l in zip(locs, labels):
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c = list(self.passthru_pt) # copy
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c[self.nth_coord] = x
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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 (0 - self.delta1
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<= c2[self.nth_coord]
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<= 1 + self.delta2):
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yield c, angle_normal, angle_tangent, l
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return _f(majorLocs, majorLabels), _f(minorLocs, minorLabels)
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class Floating(AxisArtistHelper.Floating):
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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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_verts = np.array([[0., 0.],
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[1., 1.]])
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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[:, fixed_coord] = p[fixed_coord]
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return Path(_verts)
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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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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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_verts = [0.5, 0.5]
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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[fixed_coord] = 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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majorLocs = major.locator()
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majorLabels = major.formatter.format_ticks(majorLocs)
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minor = self.axis.minor
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minorLocs = minor.locator()
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minorLabels = minor.formatter.format_ticks(minorLocs)
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data_to_axes = axes.transData - axes.transAxes
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def _f(locs, labels):
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for x, l in zip(locs, labels):
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c = [self._value, self._value]
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c[self.nth_coord] = x
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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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and 0 - self.delta1
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<= [c1, c2][self.nth_coord]
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<= 1 + self.delta2):
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yield c, angle_normal, angle_tangent, l
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return _f(majorLocs, majorLabels), _f(minorLocs, minorLabels)
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class GridHelperBase:
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def __init__(self):
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self._force_update = True
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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._force_update or self._old_limits != (x1, x2, y1, y2):
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self._update(x1, x2, y1, y2)
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self._force_update = False
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self._old_limits = (x1, x2, y1, y2)
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def _update(self, x1, x2, y1, y2):
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pass
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def invalidate(self):
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self._force_update = True
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def valid(self):
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return not self._force_update
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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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*which* : "major" or "minor"
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*axis* : "both", "x" or "y"
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"""
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return []
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def new_gridlines(self, ax):
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"""
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Create and return a new GridlineCollection instance.
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*which* : "major" or "minor"
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*axis* : "both", "x" or "y"
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"""
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gridlines = GridlinesCollection(None, transform=ax.transData,
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colors=rcParams['grid.color'],
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linestyles=rcParams['grid.linestyle'],
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linewidths=rcParams['grid.linewidth'])
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ax._set_artist_props(gridlines)
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gridlines.set_grid_helper(self)
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ax.axes._set_artist_props(gridlines)
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# gridlines.set_clip_path(self.axes.patch)
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# set_clip_path need to be deferred after Axes.cla is completed.
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# It is done inside the cla.
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return gridlines
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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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cbook._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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||
|
|
_helper = AxisArtistHelperRectlinear.Fixed(axes, loc, nth_coord)
|
||
|
|
|
||
|
|
if axis_direction is None:
|
||
|
|
axis_direction = loc
|
||
|
|
axisline = AxisArtist(axes, _helper, offset=offset,
|
||
|
|
axis_direction=axis_direction,
|
||
|
|
)
|
||
|
|
|
||
|
|
return axisline
|
||
|
|
|
||
|
|
def new_floating_axis(self, nth_coord, value,
|
||
|
|
axis_direction="bottom",
|
||
|
|
axes=None,
|
||
|
|
):
|
||
|
|
|
||
|
|
if axes is None:
|
||
|
|
cbook._warn_external(
|
||
|
|
"'new_floating_axis' explicitly requires the axes keyword.")
|
||
|
|
axes = self.axes
|
||
|
|
|
||
|
|
_helper = AxisArtistHelperRectlinear.Floating(
|
||
|
|
axes, nth_coord, value, axis_direction)
|
||
|
|
|
||
|
|
axisline = AxisArtist(axes, _helper)
|
||
|
|
|
||
|
|
axisline.line.set_clip_on(True)
|
||
|
|
axisline.line.set_clip_box(axisline.axes.bbox)
|
||
|
|
return axisline
|
||
|
|
|
||
|
|
def get_gridlines(self, which="major", axis="both"):
|
||
|
|
"""
|
||
|
|
return list of gridline coordinates in data coordinates.
|
||
|
|
|
||
|
|
*which* : "major" or "minor"
|
||
|
|
*axis* : "both", "x" or "y"
|
||
|
|
"""
|
||
|
|
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._gridOnMajor:
|
||
|
|
locs.extend(self.axes.yaxis.major.locator())
|
||
|
|
if self.axes.yaxis._gridOnMinor:
|
||
|
|
locs.extend(self.axes.yaxis.minor.locator())
|
||
|
|
|
||
|
|
for y in locs:
|
||
|
|
gridlines.append([[x1, x2], [y, y]])
|
||
|
|
|
||
|
|
return gridlines
|
||
|
|
|
||
|
|
|
||
|
|
@cbook.deprecated("3.1")
|
||
|
|
class SimpleChainedObjects:
|
||
|
|
def __init__(self, objects):
|
||
|
|
self._objects = objects
|
||
|
|
|
||
|
|
def __getattr__(self, k):
|
||
|
|
_a = SimpleChainedObjects([getattr(a, k) for a in self._objects])
|
||
|
|
return _a
|
||
|
|
|
||
|
|
def __call__(self, *args, **kwargs):
|
||
|
|
for m in self._objects:
|
||
|
|
m(*args, **kwargs)
|
||
|
|
|
||
|
|
|
||
|
|
class Axes(maxes.Axes):
|
||
|
|
|
||
|
|
@cbook.deprecated("3.1")
|
||
|
|
class AxisDict(dict):
|
||
|
|
def __init__(self, axes):
|
||
|
|
self.axes = axes
|
||
|
|
super().__init__()
|
||
|
|
|
||
|
|
def __getitem__(self, k):
|
||
|
|
if isinstance(k, tuple):
|
||
|
|
return SimpleChainedObjects(
|
||
|
|
[dict.__getitem__(self, k1) for k1 in k])
|
||
|
|
elif isinstance(k, slice):
|
||
|
|
if k == slice(None):
|
||
|
|
return SimpleChainedObjects(list(self.values()))
|
||
|
|
else:
|
||
|
|
raise ValueError("Unsupported slice")
|
||
|
|
else:
|
||
|
|
return dict.__getitem__(self, k)
|
||
|
|
|
||
|
|
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
|
||
|
|
for s in self.spines.values():
|
||
|
|
s.set_visible(False)
|
||
|
|
self.xaxis.set_visible(False)
|
||
|
|
self.yaxis.set_visible(False)
|
||
|
|
else:
|
||
|
|
self._axisline_on = False
|
||
|
|
for s in self.spines.values():
|
||
|
|
s.set_visible(True)
|
||
|
|
self.xaxis.set_visible(True)
|
||
|
|
self.yaxis.set_visible(True)
|
||
|
|
|
||
|
|
def _init_axis_artists(self, axes=None):
|
||
|
|
if axes is None:
|
||
|
|
axes = self
|
||
|
|
|
||
|
|
self._axislines = mpl_axes.Axes.AxisDict(self)
|
||
|
|
new_fixed_axis = self.get_grid_helper().new_fixed_axis
|
||
|
|
for loc in ["bottom", "top", "left", "right"]:
|
||
|
|
self._axislines[loc] = new_fixed_axis(loc=loc, axes=axes,
|
||
|
|
axis_direction=loc)
|
||
|
|
|
||
|
|
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)
|
||
|
|
|
||
|
|
@property
|
||
|
|
def axis(self):
|
||
|
|
return self._axislines
|
||
|
|
|
||
|
|
def new_gridlines(self, grid_helper=None):
|
||
|
|
"""
|
||
|
|
Create and return a new GridlineCollection instance.
|
||
|
|
|
||
|
|
*which* : "major" or "minor"
|
||
|
|
*axis* : "both", "x" or "y"
|
||
|
|
|
||
|
|
"""
|
||
|
|
if grid_helper is None:
|
||
|
|
grid_helper = self.get_grid_helper()
|
||
|
|
|
||
|
|
gridlines = grid_helper.new_gridlines(self)
|
||
|
|
return gridlines
|
||
|
|
|
||
|
|
def _init_gridlines(self, grid_helper=None):
|
||
|
|
# It is done inside the cla.
|
||
|
|
self.gridlines = self.new_gridlines(grid_helper)
|
||
|
|
|
||
|
|
def cla(self):
|
||
|
|
# gridlines need to b created before cla() since cla calls grid()
|
||
|
|
self._init_gridlines()
|
||
|
|
super().cla()
|
||
|
|
|
||
|
|
# the clip_path should be set after Axes.cla() since that's
|
||
|
|
# when a patch is created.
|
||
|
|
self.gridlines.set_clip_path(self.axes.patch)
|
||
|
|
|
||
|
|
self._init_axis_artists()
|
||
|
|
|
||
|
|
def get_grid_helper(self):
|
||
|
|
return self._grid_helper
|
||
|
|
|
||
|
|
def grid(self, b=None, which='major', axis="both", **kwargs):
|
||
|
|
"""
|
||
|
|
Toggle the gridlines, and optionally set the properties of the lines.
|
||
|
|
"""
|
||
|
|
# their are some discrepancy between the behavior of grid in
|
||
|
|
# axes_grid and the original mpl's grid, because axes_grid
|
||
|
|
# explicitly set the visibility of the gridlines.
|
||
|
|
|
||
|
|
super().grid(b, which=which, axis=axis, **kwargs)
|
||
|
|
if not self._axisline_on:
|
||
|
|
return
|
||
|
|
|
||
|
|
if b is None:
|
||
|
|
b = (self.axes.xaxis._gridOnMinor
|
||
|
|
or self.axes.xaxis._gridOnMajor
|
||
|
|
or self.axes.yaxis._gridOnMinor
|
||
|
|
or self.axes.yaxis._gridOnMajor)
|
||
|
|
|
||
|
|
self.gridlines.set_which(which)
|
||
|
|
self.gridlines.set_axis(axis)
|
||
|
|
self.gridlines.set_visible(b)
|
||
|
|
|
||
|
|
if len(kwargs):
|
||
|
|
martist.setp(self.gridlines, **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 invalidate_grid_helper(self):
|
||
|
|
self._grid_helper.invalidate()
|
||
|
|
|
||
|
|
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
|
||
|
|
|
||
|
|
|
||
|
|
Subplot = maxes.subplot_class_factory(Axes)
|
||
|
|
|
||
|
|
|
||
|
|
class AxesZero(Axes):
|
||
|
|
|
||
|
|
def _init_axis_artists(self):
|
||
|
|
super()._init_axis_artists()
|
||
|
|
|
||
|
|
new_floating_axis = self._grid_helper.new_floating_axis
|
||
|
|
xaxis_zero = new_floating_axis(nth_coord=0,
|
||
|
|
value=0.,
|
||
|
|
axis_direction="bottom",
|
||
|
|
axes=self)
|
||
|
|
|
||
|
|
xaxis_zero.line.set_clip_path(self.patch)
|
||
|
|
xaxis_zero.set_visible(False)
|
||
|
|
self._axislines["xzero"] = xaxis_zero
|
||
|
|
|
||
|
|
yaxis_zero = new_floating_axis(nth_coord=1,
|
||
|
|
value=0.,
|
||
|
|
axis_direction="left",
|
||
|
|
axes=self)
|
||
|
|
|
||
|
|
yaxis_zero.line.set_clip_path(self.patch)
|
||
|
|
yaxis_zero.set_visible(False)
|
||
|
|
self._axislines["yzero"] = yaxis_zero
|
||
|
|
|
||
|
|
|
||
|
|
SubplotZero = maxes.subplot_class_factory(AxesZero)
|