194 lines
6.6 KiB
Python
194 lines
6.6 KiB
Python
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"""
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Provides classes to style the axis lines.
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"""
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import math
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import numpy as np
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import matplotlib as mpl
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from matplotlib.patches import _Style, FancyArrowPatch
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from matplotlib.path import Path
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from matplotlib.transforms import IdentityTransform
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class _FancyAxislineStyle:
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class SimpleArrow(FancyArrowPatch):
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"""The artist class that will be returned for SimpleArrow style."""
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_ARROW_STYLE = "->"
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def __init__(self, axis_artist, line_path, transform,
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line_mutation_scale):
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self._axis_artist = axis_artist
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self._line_transform = transform
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self._line_path = line_path
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self._line_mutation_scale = line_mutation_scale
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FancyArrowPatch.__init__(self,
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path=self._line_path,
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arrowstyle=self._ARROW_STYLE,
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patchA=None,
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patchB=None,
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shrinkA=0.,
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shrinkB=0.,
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mutation_scale=line_mutation_scale,
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mutation_aspect=None,
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transform=IdentityTransform(),
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)
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def set_line_mutation_scale(self, scale):
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self.set_mutation_scale(scale*self._line_mutation_scale)
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def _extend_path(self, path, mutation_size=10):
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"""
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Extend the path to make a room for drawing arrow.
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"""
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(x0, y0), (x1, y1) = path.vertices[-2:]
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theta = math.atan2(y1 - y0, x1 - x0)
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x2 = x1 + math.cos(theta) * mutation_size
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y2 = y1 + math.sin(theta) * mutation_size
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if path.codes is None:
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return Path(np.concatenate([path.vertices, [[x2, y2]]]))
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else:
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return Path(np.concatenate([path.vertices, [[x2, y2]]]),
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np.concatenate([path.codes, [Path.LINETO]]))
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def set_path(self, path):
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self._line_path = path
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def draw(self, renderer):
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"""
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Draw the axis line.
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1) Transform the path to the display coordinate.
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2) Extend the path to make a room for arrow.
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3) Update the path of the FancyArrowPatch.
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4) Draw.
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"""
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path_in_disp = self._line_transform.transform_path(self._line_path)
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mutation_size = self.get_mutation_scale() # line_mutation_scale()
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extended_path = self._extend_path(path_in_disp,
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mutation_size=mutation_size)
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self._path_original = extended_path
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FancyArrowPatch.draw(self, renderer)
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def get_window_extent(self, renderer=None):
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path_in_disp = self._line_transform.transform_path(self._line_path)
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mutation_size = self.get_mutation_scale() # line_mutation_scale()
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extended_path = self._extend_path(path_in_disp,
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mutation_size=mutation_size)
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self._path_original = extended_path
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return FancyArrowPatch.get_window_extent(self, renderer)
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class FilledArrow(SimpleArrow):
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"""The artist class that will be returned for FilledArrow style."""
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_ARROW_STYLE = "-|>"
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def __init__(self, axis_artist, line_path, transform,
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line_mutation_scale, facecolor):
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super().__init__(axis_artist, line_path, transform,
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line_mutation_scale)
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self.set_facecolor(facecolor)
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class AxislineStyle(_Style):
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"""
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A container class which defines style classes for AxisArtists.
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An instance of any axisline style class is a callable object,
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whose call signature is ::
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__call__(self, axis_artist, path, transform)
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When called, this should return an `.Artist` with the following methods::
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def set_path(self, path):
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# set the path for axisline.
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def set_line_mutation_scale(self, scale):
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# set the scale
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def draw(self, renderer):
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# draw
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"""
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_style_list = {}
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class _Base:
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# The derived classes are required to be able to be initialized
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# w/o arguments, i.e., all its argument (except self) must have
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# the default values.
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def __init__(self):
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"""
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initialization.
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"""
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super().__init__()
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def __call__(self, axis_artist, transform):
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"""
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Given the AxisArtist instance, and transform for the path (set_path
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method), return the Matplotlib artist for drawing the axis line.
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"""
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return self.new_line(axis_artist, transform)
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class SimpleArrow(_Base):
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"""
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A simple arrow.
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"""
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ArrowAxisClass = _FancyAxislineStyle.SimpleArrow
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def __init__(self, size=1):
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"""
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Parameters
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----------
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size : float
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Size of the arrow as a fraction of the ticklabel size.
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"""
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self.size = size
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super().__init__()
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def new_line(self, axis_artist, transform):
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linepath = Path([(0, 0), (0, 1)])
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axisline = self.ArrowAxisClass(axis_artist, linepath, transform,
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line_mutation_scale=self.size)
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return axisline
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_style_list["->"] = SimpleArrow
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class FilledArrow(SimpleArrow):
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"""
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An arrow with a filled head.
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"""
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ArrowAxisClass = _FancyAxislineStyle.FilledArrow
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def __init__(self, size=1, facecolor=None):
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"""
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Parameters
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----------
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size : float
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Size of the arrow as a fraction of the ticklabel size.
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facecolor : color, default: :rc:`axes.edgecolor`
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Fill color.
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.. versionadded:: 3.7
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"""
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if facecolor is None:
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facecolor = mpl.rcParams['axes.edgecolor']
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self.size = size
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self._facecolor = facecolor
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super().__init__(size=size)
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def new_line(self, axis_artist, transform):
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linepath = Path([(0, 0), (0, 1)])
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axisline = self.ArrowAxisClass(axis_artist, linepath, transform,
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line_mutation_scale=self.size,
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facecolor=self._facecolor)
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return axisline
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_style_list["-|>"] = FilledArrow
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