mpl_toolkits.axes_grid1.anchored_artists.AnchoredDirectionArrows

class mpl_toolkits.axes_grid1.anchored_artists.AnchoredDirectionArrows(transform, label_x, label_y, length=0.15, fontsize=0.08, loc='upper left', 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)

Bases: AnchoredOffsetbox

Draw two perpendicular arrows to indicate directions.

Parameters:

transformmatplotlib.transforms.Transform

The transformation object for the coordinate system in use, i.e., matplotlib.axes.Axes.transAxes.

label_x, label_ystr

Label text for the x and y arrows

lengthfloat, default: 0.15

Length of the arrow, given in coordinates of transform.

fontsizefloat, default: 0.08

Size of label strings, given in coordinates of transform.

locstr, default: 'upper left'

Location of the arrow. Valid locations are 'upper left', 'upper center', 'upper right', 'center left', 'center', 'center right', 'lower left', 'lower center, 'lower right'. For backward compatibility, numeric values are accepted as well. See the parameter loc of Legend for details.

anglefloat, default: 0

The angle of the arrows in degrees.

aspect_ratiofloat, default: 1

The ratio of the length of arrow_x and arrow_y. Negative numbers can be used to change the direction.

padfloat, default: 0.4

Padding around the labels and arrows, in fraction of the font size.

borderpadfloat, default: 0.4

Border padding, in fraction of the font size.

frameonbool, default: False

If True, draw a box around the arrows and labels.

colorstr, default: 'white'

Color for the arrows and labels.

alphafloat, default: 1

Alpha values of the arrows and labels

sep_x, sep_yfloat, default: 0.01 and 0 respectively

Separation between the arrows and labels in coordinates of transform.

fontpropertiesmatplotlib.font_manager.FontProperties, optional

Font properties for the label text.

back_lengthfloat, default: 0.15

Fraction of the arrow behind the arrow crossing.

head_widthfloat, default: 10

Width of arrow head, sent to ArrowStyle.

head_lengthfloat, default: 15

Length of arrow head, sent to ArrowStyle.

tail_widthfloat, default: 2

Width of arrow tail, sent to ArrowStyle.

text_props, arrow_propsdict

Properties of the text and arrows, passed to textpath.TextPath and patches.FancyArrowPatch.

**kwargs

Keyword arguments forwarded to AnchoredOffsetbox.

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)

Attributes:

arrow_x, arrow_ymatplotlib.patches.FancyArrowPatch

Arrow x and y

text_path_x, text_path_ymatplotlib.textpath.TextPath

Path for arrow labels

p_x, p_ymatplotlib.patches.PathPatch

Patch for arrow labels

boxmatplotlib.offsetbox.AuxTransformBox

Container for the arrows and labels.

set(*, agg_filter=<UNSET>, alpha=<UNSET>, animated=<UNSET>, bbox_to_anchor=<UNSET>, child=<UNSET>, clip_box=<UNSET>, clip_on=<UNSET>, clip_path=<UNSET>, gid=<UNSET>, height=<UNSET>, in_layout=<UNSET>, label=<UNSET>, mouseover=<UNSET>, offset=<UNSET>, path_effects=<UNSET>, picker=<UNSET>, rasterized=<UNSET>, sketch_params=<UNSET>, snap=<UNSET>, transform=<UNSET>, url=<UNSET>, visible=<UNSET>, width=<UNSET>, zorder=<UNSET>)

Set multiple properties at once.

Supported properties are

Property	Description
agg_filter	a filter function, which takes a (m, n, 3) float array and a dpi value, and returns a (m, n, 3) array and two offsets from the bottom left corner of the image
alpha	scalar or None
animated	bool
bbox_to_anchor	unknown
child	unknown
clip_box	Bbox
clip_on	bool
clip_path	Patch or (Path, Transform) or None
figure	Figure
gid	str
height	float
in_layout	bool
label	object
mouseover	bool
offset	(float, float) or callable
path_effects	AbstractPathEffect
picker	None or bool or float or callable
rasterized	bool
sketch_params	(scale: float, length: float, randomness: float)
snap	bool or None
transform	Transform
url	str
visible	bool
width	float
zorder	float

Examples using mpl_toolkits.axes_grid1.anchored_artists.AnchoredDirectionArrows

Anchored Direction Arrow

Anchored Direction Arrow