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