matplotlib/lib/matplotlib/patches.py at v3.11.2 · matplotlib/matplotlib · GitHub

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r"""

Patches are `.Artist`\s with a face color and an edge color.

"""

import functools

import inspect

import math

from numbers import Number, Real

import textwrap

from types import SimpleNamespace

from collections import namedtuple

from matplotlib.transforms import Affine2D

import numpy as np

import matplotlib as mpl

from . import (_api, artist, cbook, colors, _docstring, hatch as mhatch,

lines as mlines, transforms)

from .bezier import (

NonIntersectingPathException, get_cos_sin, get_intersection,

get_parallels, inside_circle, make_wedged_bezier2,

split_bezier_intersecting_with_closedpath, split_path_inout)

from .path import Path

from ._enums import JoinStyle, CapStyle

@_docstring.interpd

@_api.define_aliases({

"antialiased": ["aa"],

"edgecolor": ["ec"],

"facecolor": ["fc"],

"linestyle": ["ls"],

"linewidth": ["lw"],

})

class Patch(artist.Artist):

"""

A patch is a 2D artist with a face color and an edge color.

If any of *edgecolor*, *facecolor*, *linewidth*, or *antialiased*

are *None*, they default to their rc params setting.

"""

zorder = 1

# Whether to draw an edge by default. Set on a

# subclass-by-subclass basis.

_edge_default = False

def __init__(self, *,

edgecolor=None,

facecolor=None,

color=None,

linewidth=None,

linestyle=None,

antialiased=None,

hatch=None,

fill=True,

capstyle=None,

joinstyle=None,

hatchcolor=None,

edgegapcolor=None,

**kwargs):

"""

The following kwarg properties are supported

%(Patch:kwdoc)s

"""

super().__init__()

if linestyle is None:

linestyle = "solid"

if capstyle is None:

capstyle = CapStyle.butt

if joinstyle is None:

joinstyle = JoinStyle.miter

self._hatch_linewidth = mpl.rcParams['hatch.linewidth']

self._fill = bool(fill) # needed for set_facecolor call

if color is not None:

if edgecolor is not None or facecolor is not None:

_api.warn_external(

"Setting the 'color' property will override "

"the edgecolor or facecolor properties.")

self.set_color(color)

else:

self.set_edgecolor(edgecolor)

self.set_hatchcolor(hatchcolor)

self.set_facecolor(facecolor)

self._linewidth = 0

self._unscaled_dash_pattern = (0, None) # offset, dash

self._dash_pattern = (0, None) # offset, dash (scaled by linewidth)

self._gapcolor = None

self.set_linestyle(linestyle)

self.set_linewidth(linewidth)

self.set_antialiased(antialiased)

self.set_hatch(hatch)

self.set_capstyle(capstyle)

self.set_joinstyle(joinstyle)

self.set_edgegapcolor(edgegapcolor)

if len(kwargs):

self._internal_update(kwargs)

def get_verts(self):

"""

Return a copy of the vertices used in this patch.

If the patch contains Bézier curves, the curves will be interpolated by

line segments. To access the curves as curves, use `get_path`.

"""

trans = self.get_transform()

path = self.get_path()

polygons = path.to_polygons(trans)

if len(polygons):

return polygons[0]

return []

def _process_radius(self, radius):

if radius is not None:

return radius

if isinstance(self._picker, Number):

_radius = self._picker

else:

if self.get_edgecolor()[3] == 0:

_radius = 0

else:

_radius = self.get_linewidth()

return _radius

def contains(self, mouseevent, radius=None):

"""

Test whether the mouse event occurred in the patch.

Parameters

----------

mouseevent : `~matplotlib.backend_bases.MouseEvent`

Where the user clicked.

radius : float, optional

Additional margin on the patch in target coordinates of

`.Patch.get_transform`. See `.Path.contains_point` for further

details.

If `None`, the default value depends on the state of the object:

- If `.Artist.get_picker` is a number, the default

is that value. This is so that picking works as expected.

- Otherwise if the edge color has a non-zero alpha, the default

is half of the linewidth. This is so that all the colored

pixels are "in" the patch.

- Finally, if the edge has 0 alpha, the default is 0. This is

so that patches without a stroked edge do not have points

outside of the filled region report as "in" due to an

invisible edge.

Returns

-------

(bool, empty dict)

"""

if self._different_canvas(mouseevent):

return False, {}

radius = self._process_radius(radius)

codes = self.get_path().codes

if codes is not None:

vertices = self.get_path().vertices

# if the current path is concatenated by multiple sub paths.

# get the indexes of the starting code(MOVETO) of all sub paths

idxs, = np.where(codes == Path.MOVETO)

# Don't split before the first MOVETO.

idxs = idxs[1:]

subpaths = map(

Path, np.split(vertices, idxs), np.split(codes, idxs))

else:

subpaths = [self.get_path()]

inside = any(

subpath.contains_point(

(mouseevent.x, mouseevent.y), self.get_transform(), radius)

for subpath in subpaths)

return inside, {}

def contains_point(self, point, radius=None):

"""

Return whether the given point is inside the patch.

Parameters

----------

point : (float, float)

The point (x, y) to check, in target coordinates of

``.Patch.get_transform()``. These are display coordinates for patches

that are added to a figure or Axes.

radius : float, optional

Additional margin on the patch in target coordinates of

`.Patch.get_transform`. See `.Path.contains_point` for further

details.

If `None`, the default value depends on the state of the object:

- If `.Artist.get_picker` is a number, the default

is that value. This is so that picking works as expected.

- Otherwise if the edge color has a non-zero alpha, the default

is half of the linewidth. This is so that all the colored

pixels are "in" the patch.

- Finally, if the edge has 0 alpha, the default is 0. This is

so that patches without a stroked edge do not have points

outside of the filled region report as "in" due to an

invisible edge.

Returns

-------

bool

Notes

-----

The proper use of this method depends on the transform of the patch.

Isolated patches do not have a transform. In this case, the patch

creation coordinates and the point coordinates match. The following

example checks that the center of a circle is within the circle

>>> center = 0, 0

>>> c = Circle(center, radius=1)

>>> c.contains_point(center)

True

The convention of checking against the transformed patch stems from

the fact that this method is predominantly used to check if display

coordinates (e.g. from mouse events) are within the patch. If you want

to do the above check with data coordinates, you have to properly

transform them first:

>>> center = 0, 0

>>> c = Circle(center, radius=3)

>>> plt.gca().add_patch(c)

>>> transformed_interior_point = c.get_data_transform().transform((0, 2))

>>> c.contains_point(transformed_interior_point)

True

"""

radius = self._process_radius(radius)

return self.get_path().contains_point(point,

self.get_transform(),

radius)

def contains_points(self, points, radius=None):

"""

Return whether the given points are inside the patch.

Parameters

----------

points : (N, 2) array

The points to check, in target coordinates of

``self.get_transform()``. These are display coordinates for patches

that are added to a figure or Axes. Columns contain x and y values.

radius : float, optional

Additional margin on the patch in target coordinates of

`.Patch.get_transform`. See `.Path.contains_point` for further

details.

If `None`, the default value depends on the state of the object:

- If `.Artist.get_picker` is a number, the default

is that value. This is so that picking works as expected.

- Otherwise if the edge color has a non-zero alpha, the default

is half of the linewidth. This is so that all the colored

pixels are "in" the patch.

- Finally, if the edge has 0 alpha, the default is 0. This is

so that patches without a stroked edge do not have points

outside of the filled region report as "in" due to an

invisible edge.

Returns

-------

length-N bool array

Notes

-----

The proper use of this method depends on the transform of the patch.

See the notes on `.Patch.contains_point`.

"""

radius = self._process_radius(radius)

return self.get_path().contains_points(points,

self.get_transform(),

radius)

def update_from(self, other):

# docstring inherited.

super().update_from(other)

# For some properties we don't need or don't want to go through the

# getters/setters, so we just copy them directly.

self._edgecolor = other._edgecolor

self._facecolor = other._facecolor

self._original_edgecolor = other._original_edgecolor

self._original_facecolor = other._original_facecolor

self._fill = other._fill

self._hatch = other._hatch

self._hatch_color = other._hatch_color

self._original_hatchcolor = other._original_hatchcolor

self._unscaled_dash_pattern = other._unscaled_dash_pattern

self._gapcolor = other._gapcolor

self.set_linewidth(other._linewidth) # also sets scaled dashes

self.set_transform(other.get_data_transform())

# If the transform of other needs further initialization, then it will

# be the case for this artist too.

self._transformSet = other.is_transform_set()

def get_extents(self):

"""

Return the `Patch`'s axis-aligned extents as a `~.transforms.Bbox`.

"""

return self.get_path().get_extents(self.get_transform())

def get_transform(self):

"""Return the `~.transforms.Transform` applied to the `Patch`."""

return self.get_patch_transform() + artist.Artist.get_transform(self)

def get_data_transform(self):

"""

Return the `~.transforms.Transform` mapping data coordinates to

physical coordinates.

"""

return artist.Artist.get_transform(self)

def get_patch_transform(self):

"""

Return the `~.transforms.Transform` instance mapping patch coordinates

to data coordinates.

For example, one may define a patch of a circle which represents a

radius of 5 by providing coordinates for a unit circle, and a

transform which scales the coordinates (the patch coordinate) by 5.

"""

return transforms.IdentityTransform()

def get_antialiased(self):

"""Return whether antialiasing is used for drawing."""

return self._antialiased

def get_edgecolor(self):

"""Return the edge color."""

return self._edgecolor

def get_facecolor(self):

"""Return the face color."""

return self._facecolor

def get_hatchcolor(self):

"""Return the hatch color."""

if self._hatch_color == 'edge':

if self._edgecolor[3] == 0: # fully transparent

return colors.to_rgba(mpl.rcParams['patch.edgecolor'])

return self.get_edgecolor()

return self._hatch_color

def get_linewidth(self):

"""Return the line width in points."""

return self._linewidth

def get_linestyle(self):

"""Return the linestyle."""

return self._linestyle

def set_antialiased(self, aa):

"""

Set whether to use antialiased rendering.

Parameters

----------

aa : bool or None

"""

self._antialiased = mpl._val_or_rc(aa, 'patch.antialiased')

self.stale = True

def _set_edgecolor(self, color):

if color is None:

if (mpl.rcParams['patch.force_edgecolor'] or

not self._fill or self._edge_default):

color = mpl.rcParams['patch.edgecolor']

else:

color = 'none'

self._edgecolor = colors.to_rgba(color, self._alpha)

self.stale = True

def set_edgecolor(self, color):

"""

Set the patch edge color.

Parameters

----------

color : :mpltype:`color` or None

"""

self._original_edgecolor = color

self._set_edgecolor(color)

def _set_facecolor(self, color):

color = mpl._val_or_rc(color, 'patch.facecolor')

alpha = self._alpha if self._fill else 0

self._facecolor = colors.to_rgba(color, alpha)

self.stale = True

def set_facecolor(self, color):

"""

Set the patch face color.

Parameters

----------

color : :mpltype:`color` or None

"""

self._original_facecolor = color

self._set_facecolor(color)

def set_color(self, c):

"""

Set both the edgecolor and the facecolor.

Parameters

----------

c : :mpltype:`color`

matplotlib/lib/matplotlib/patches.py at v3.11.2 · matplotlib/matplotlib · GitHub

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