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=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) [source]

Bases: matplotlib.offsetbox.AnchoredOffsetbox

Draw two perpendicular arrows to indicate directions.

Parameters:

transform : matplotlib.transforms.Transform The transformation object for the coordinate system in use, i.e., matplotlib.axes.Axes.transAxes. label_x, label_y : string Label text for the x and y arrows length : int or float, optional Length of the arrow, given in coordinates of transform. Defaults to 0.15. fontsize : int, optional Size of label strings, given in coordinates of transform. Defaults to 0.08. loc : int, optional 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 Defaults to 2. angle : int or float, optional The angle of the arrows in degrees. Defaults to 0. aspect_ratio : int or float, optional The ratio of the length of arrow_x and arrow_y. Negative numbers can be used to change the direction. Defaults to 1. pad : int or float, optional Padding around the labels and arrows, in fraction of the font size. Defaults to 0.4. borderpad : int or float, optional Border padding, in fraction of the font size. Defaults to 0.4. frameon : bool, optional If True, draw a box around the arrows and labels. Defaults to False. color : str, optional Color for the arrows and labels. Defaults to white. alpha : int or float, optional Alpha values of the arrows and labels Defaults to 1. sep_x, sep_y : int or float, optional Separation between the arrows and labels in coordinates of transform. Defaults to 0.01 and 0. fontproperties : matplotlib.font_manager.FontProperties, optional Font properties for the label text. back_length : float, optional Fraction of the arrow behind the arrow crossing. Defaults to 0.15. head_width : int or float, optional Width of arrow head, sent to ArrowStyle. Defaults to 10. head_length : int or float, optional Length of arrow head, sent to ArrowStyle. Defaults to 15. tail_width : int or float, optional Width of arrow tail, sent to ArrowStyle. Defaults to 2. text_props, arrow_props : dict Properties of the text and arrows, passed to matplotlib.text.TextPath and matplotlib.patches.FancyArrowPatch **kwargs Keyworded arguments to pass to matplotlib.offsetbox.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_y : matplotlib.patches.FancyArrowPatch Arrow x and y text_path_x, text_path_y : matplotlib.text.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.

Examples using mpl_toolkits.axes_grid1.anchored_artists.AnchoredDirectionArrows