from matplotlib import transforms
from matplotlib.offsetbox import (AnchoredOffsetbox, AuxTransformBox,
DrawingArea, TextArea, VPacker)
from matplotlib.patches import (Rectangle, Ellipse, ArrowStyle,
FancyArrowPatch, PathPatch)
from matplotlib.text import TextPath
__all__ = ['AnchoredDrawingArea', 'AnchoredAuxTransformBox',
'AnchoredEllipse', 'AnchoredSizeBar', 'AnchoredDirectionArrows']
[docs]class AnchoredDrawingArea(AnchoredOffsetbox):
[docs] def __init__(self, width, height, xdescent, ydescent,
loc, pad=0.4, borderpad=0.5, prop=None, frameon=True,
**kwargs):
"""
An anchored container with a fixed size and fillable DrawingArea.
Artists added to the *drawing_area* will have their coordinates
interpreted as pixels. Any transformations set on the artists will be
overridden.
Parameters
----------
width, height : float
width and height of the container, in pixels.
xdescent, ydescent : float
descent of the container in the x- and y- direction, in pixels.
loc : int
Location of this artist. Valid location codes are::
'upper right' : 1,
'upper left' : 2,
'lower left' : 3,
'lower right' : 4,
'right' : 5,
'center left' : 6,
'center right' : 7,
'lower center' : 8,
'upper center' : 9,
'center' : 10
pad : float, default: 0.4
Padding around the child objects, in fraction of the font size.
borderpad : float, default: 0.5
Border padding, in fraction of the font size.
prop : `matplotlib.font_manager.FontProperties`, optional
Font property used as a reference for paddings.
frameon : bool, default: True
If True, draw a box around this artists.
**kwargs
Keyworded arguments to pass to
:class:`matplotlib.offsetbox.AnchoredOffsetbox`.
Attributes
----------
drawing_area : `matplotlib.offsetbox.DrawingArea`
A container for artists to display.
Examples
--------
To display blue and red circles of different sizes in the upper right
of an axes *ax*:
>>> ada = AnchoredDrawingArea(20, 20, 0, 0,
... loc='upper right', frameon=False)
>>> ada.drawing_area.add_artist(Circle((10, 10), 10, fc="b"))
>>> ada.drawing_area.add_artist(Circle((30, 10), 5, fc="r"))
>>> ax.add_artist(ada)
"""
self.da = DrawingArea(width, height, xdescent, ydescent)
self.drawing_area = self.da
super().__init__(
loc, pad=pad, borderpad=borderpad, child=self.da, prop=None,
frameon=frameon, **kwargs
)
[docs]class AnchoredEllipse(AnchoredOffsetbox):
[docs] def __init__(self, transform, width, height, angle, loc,
pad=0.1, borderpad=0.1, prop=None, frameon=True, **kwargs):
"""
Draw an anchored ellipse of a given size.
Parameters
----------
transform : `matplotlib.transforms.Transform`
The transformation object for the coordinate system in use, i.e.,
:attr:`matplotlib.axes.Axes.transData`.
width, height : float
Width and height of the ellipse, given in coordinates of
*transform*.
angle : float
Rotation of the ellipse, in degrees, anti-clockwise.
loc : int
Location of this size bar. Valid location codes are::
'upper right' : 1,
'upper left' : 2,
'lower left' : 3,
'lower right' : 4,
'right' : 5,
'center left' : 6,
'center right' : 7,
'lower center' : 8,
'upper center' : 9,
'center' : 10
pad : float, optional
Padding around the ellipse, in fraction of the font size. Defaults
to 0.1.
borderpad : float, default: 0.1
Border padding, in fraction of the font size.
frameon : bool, default: True
If True, draw a box around the ellipse.
prop : `matplotlib.font_manager.FontProperties`, optional
Font property used as a reference for paddings.
**kwargs
Keyworded arguments to pass to
:class:`matplotlib.offsetbox.AnchoredOffsetbox`.
Attributes
----------
ellipse : `matplotlib.patches.Ellipse`
Ellipse patch drawn.
"""
self._box = AuxTransformBox(transform)
self.ellipse = Ellipse((0, 0), width, height, angle)
self._box.add_artist(self.ellipse)
AnchoredOffsetbox.__init__(self, loc, pad=pad, borderpad=borderpad,
child=self._box,
prop=prop,
frameon=frameon, **kwargs)
[docs]class AnchoredSizeBar(AnchoredOffsetbox):
[docs] def __init__(self, transform, size, label, loc,
pad=0.1, borderpad=0.1, sep=2,
frameon=True, size_vertical=0, color='black',
label_top=False, fontproperties=None, fill_bar=None,
**kwargs):
"""
Draw a horizontal scale bar with a center-aligned label underneath.
Parameters
----------
transform : `matplotlib.transforms.Transform`
The transformation object for the coordinate system in use, i.e.,
:attr:`matplotlib.axes.Axes.transData`.
size : float
Horizontal length of the size bar, given in coordinates of
*transform*.
label : str
Label to display.
loc : int
Location of this size bar. Valid location codes are::
'upper right' : 1,
'upper left' : 2,
'lower left' : 3,
'lower right' : 4,
'right' : 5,
'center left' : 6,
'center right' : 7,
'lower center' : 8,
'upper center' : 9,
'center' : 10
pad : float, default: 0.1
Padding around the label and size bar, in fraction of the font
size.
borderpad : float, default: 0.1
Border padding, in fraction of the font size.
sep : float, default: 2
Separation between the label and the size bar, in points.
frameon : bool, default: True
If True, draw a box around the horizontal bar and label.
size_vertical : float, default: 0
Vertical length of the size bar, given in coordinates of
*transform*.
color : str, default: 'black'
Color for the size bar and label.
label_top : bool, default: False
If True, the label will be over the size bar.
fontproperties : `matplotlib.font_manager.FontProperties`, optional
Font properties for the label text.
fill_bar : bool, optional
If True and if size_vertical is nonzero, the size bar will
be filled in with the color specified by the size bar.
Defaults to True if `size_vertical` is greater than
zero and False otherwise.
**kwargs
Keyworded arguments to pass to
:class:`matplotlib.offsetbox.AnchoredOffsetbox`.
Attributes
----------
size_bar : `matplotlib.offsetbox.AuxTransformBox`
Container for the size bar.
txt_label : `matplotlib.offsetbox.TextArea`
Container for the label of the size bar.
Notes
-----
If *prop* is passed as a keyworded argument, but *fontproperties* is
not, then *prop* is be assumed to be the intended *fontproperties*.
Using both *prop* and *fontproperties* is not supported.
Examples
--------
>>> import matplotlib.pyplot as plt
>>> import numpy as np
>>> from mpl_toolkits.axes_grid1.anchored_artists import (
... AnchoredSizeBar)
>>> fig, ax = plt.subplots()
>>> ax.imshow(np.random.random((10, 10)))
>>> bar = AnchoredSizeBar(ax.transData, 3, '3 data units', 4)
>>> ax.add_artist(bar)
>>> fig.show()
Using all the optional parameters
>>> import matplotlib.font_manager as fm
>>> fontprops = fm.FontProperties(size=14, family='monospace')
>>> bar = AnchoredSizeBar(ax.transData, 3, '3 units', 4, pad=0.5,
... sep=5, borderpad=0.5, frameon=False,
... size_vertical=0.5, color='white',
... fontproperties=fontprops)
"""
if fill_bar is None:
fill_bar = size_vertical > 0
self.size_bar = AuxTransformBox(transform)
self.size_bar.add_artist(Rectangle((0, 0), size, size_vertical,
fill=fill_bar, facecolor=color,
edgecolor=color))
if fontproperties is None and 'prop' in kwargs:
fontproperties = kwargs.pop('prop')
if fontproperties is None:
textprops = {'color': color}
else:
textprops = {'color': color, 'fontproperties': fontproperties}
self.txt_label = TextArea(
label,
minimumdescent=False,
textprops=textprops)
if label_top:
_box_children = [self.txt_label, self.size_bar]
else:
_box_children = [self.size_bar, self.txt_label]
self._box = VPacker(children=_box_children,
align="center",
pad=0, sep=sep)
AnchoredOffsetbox.__init__(self, loc, pad=pad, borderpad=borderpad,
child=self._box,
prop=fontproperties,
frameon=frameon, **kwargs)
[docs]class AnchoredDirectionArrows(AnchoredOffsetbox):
[docs] def __init__(self, transform, label_x, label_y, length=0.15,
fontsize=0.08, loc=2, angle=0, aspect_ratio=1, pad=0.4,
borderpad=0.4, frameon=False, color='w', alpha=1,
sep_x=0.01, sep_y=0, fontproperties=None, back_length=0.15,
head_width=10, head_length=15, tail_width=2,
text_props=None, arrow_props=None,
**kwargs):
"""
Draw two perpendicular arrows to indicate directions.
Parameters
----------
transform : `matplotlib.transforms.Transform`
The transformation object for the coordinate system in use, i.e.,
:attr:`matplotlib.axes.Axes.transAxes`.
label_x, label_y : str
Label text for the x and y arrows
length : float, default: 0.15
Length of the arrow, given in coordinates of *transform*.
fontsize : float, default: 0.08
Size of label strings, given in coordinates of *transform*.
loc : int, default: 2
Location of the direction arrows. Valid location codes are::
'upper right' : 1,
'upper left' : 2,
'lower left' : 3,
'lower right' : 4,
'right' : 5,
'center left' : 6,
'center right' : 7,
'lower center' : 8,
'upper center' : 9,
'center' : 10
angle : float, default: 0
The angle of the arrows in degrees.
aspect_ratio : float, default: 1
The ratio of the length of arrow_x and arrow_y.
Negative numbers can be used to change the direction.
pad : float, default: 0.4
Padding around the labels and arrows, in fraction of the font size.
borderpad : float, default: 0.4
Border padding, in fraction of the font size.
frameon : bool, default: False
If True, draw a box around the arrows and labels.
color : str, default: 'white'
Color for the arrows and labels.
alpha : float, default: 1
Alpha values of the arrows and labels
sep_x, sep_y : float, default: 0.01 and 0 respectively
Separation between the arrows and labels in coordinates of
*transform*.
fontproperties : `matplotlib.font_manager.FontProperties`, optional
Font properties for the label text.
back_length : float, default: 0.15
Fraction of the arrow behind the arrow crossing.
head_width : float, default: 10
Width of arrow head, sent to ArrowStyle.
head_length : float, default: 15
Length of arrow head, sent to ArrowStyle.
tail_width : float, default: 2
Width of arrow tail, sent to ArrowStyle.
text_props, arrow_props : dict
Properties of the text and arrows, passed to
`.textpath.TextPath` and `.patches.FancyArrowPatch`.
**kwargs
Keyworded arguments to pass to
:class:`matplotlib.offsetbox.AnchoredOffsetbox`.
Attributes
----------
arrow_x, arrow_y : `matplotlib.patches.FancyArrowPatch`
Arrow x and y
text_path_x, text_path_y : `matplotlib.textpath.TextPath`
Path for arrow labels
p_x, p_y : `matplotlib.patches.PathPatch`
Patch for arrow labels
box : `matplotlib.offsetbox.AuxTransformBox`
Container for the arrows and labels.
Notes
-----
If *prop* is passed as a keyword argument, but *fontproperties* is
not, then *prop* is be assumed to be the intended *fontproperties*.
Using both *prop* and *fontproperties* is not supported.
Examples
--------
>>> import matplotlib.pyplot as plt
>>> import numpy as np
>>> from mpl_toolkits.axes_grid1.anchored_artists import (
... AnchoredDirectionArrows)
>>> fig, ax = plt.subplots()
>>> ax.imshow(np.random.random((10, 10)))
>>> arrows = AnchoredDirectionArrows(ax.transAxes, '111', '110')
>>> ax.add_artist(arrows)
>>> fig.show()
Using several of the optional parameters, creating downward pointing
arrow and high contrast text labels.
>>> import matplotlib.font_manager as fm
>>> fontprops = fm.FontProperties(family='monospace')
>>> arrows = AnchoredDirectionArrows(ax.transAxes, 'East', 'South',
... loc='lower left', color='k',
... aspect_ratio=-1, sep_x=0.02,
... sep_y=-0.01,
... text_props={'ec':'w', 'fc':'k'},
... fontproperties=fontprops)
"""
if arrow_props is None:
arrow_props = {}
if text_props is None:
text_props = {}
arrowstyle = ArrowStyle("Simple",
head_width=head_width,
head_length=head_length,
tail_width=tail_width)
if fontproperties is None and 'prop' in kwargs:
fontproperties = kwargs.pop('prop')
if 'color' not in arrow_props:
arrow_props['color'] = color
if 'alpha' not in arrow_props:
arrow_props['alpha'] = alpha
if 'color' not in text_props:
text_props['color'] = color
if 'alpha' not in text_props:
text_props['alpha'] = alpha
t_start = transform
t_end = t_start + transforms.Affine2D().rotate_deg(angle)
self.box = AuxTransformBox(t_end)
length_x = length
length_y = length*aspect_ratio
self.arrow_x = FancyArrowPatch(
(0, back_length*length_y),
(length_x, back_length*length_y),
arrowstyle=arrowstyle,
shrinkA=0.0,
shrinkB=0.0,
**arrow_props)
self.arrow_y = FancyArrowPatch(
(back_length*length_x, 0),
(back_length*length_x, length_y),
arrowstyle=arrowstyle,
shrinkA=0.0,
shrinkB=0.0,
**arrow_props)
self.box.add_artist(self.arrow_x)
self.box.add_artist(self.arrow_y)
text_path_x = TextPath((
length_x+sep_x, back_length*length_y+sep_y), label_x,
size=fontsize, prop=fontproperties)
self.p_x = PathPatch(text_path_x, transform=t_start, **text_props)
self.box.add_artist(self.p_x)
text_path_y = TextPath((
length_x*back_length+sep_x, length_y*(1-back_length)+sep_y),
label_y, size=fontsize, prop=fontproperties)
self.p_y = PathPatch(text_path_y, **text_props)
self.box.add_artist(self.p_y)
AnchoredOffsetbox.__init__(self, loc, pad=pad, borderpad=borderpad,
child=self.box,
frameon=frameon, **kwargs)
