class mpl_toolkits.axes_grid1.anchored_artists.AnchoredSizeBar(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)[source]

Bases: matplotlib.offsetbox.AnchoredOffsetbox

Draw a horizontal scale bar with a center-aligned label underneath.


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

sizeint or float

Horizontal length of the size bar, given in coordinates of transform.


Label to display.


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
padint or float, optional

Padding around the label and size bar, in fraction of the font size. Defaults to 0.1.

borderpadint or float, optional

Border padding, in fraction of the font size. Defaults to 0.1.

sepint or float, optional

Separation between the label and the size bar, in points. Defaults to 2.

frameonbool, optional

If True, draw a box around the horizontal bar and label. Defaults to True.

size_verticalint or float, optional

Vertical length of the size bar, given in coordinates of transform. Defaults to 0.

colorstr, optional

Color for the size bar and label. Defaults to black.

label_topbool, optional

If True, the label will be over the size bar. Defaults to False.

fontpropertiesmatplotlib.font_manager.FontProperties, optional

Font properties for the label text.

fill_barbool, 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.


Keyworded arguments to pass to matplotlib.offsetbox.AnchoredOffsetbox.


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.


>>> 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)

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)

Container for the size bar.


Container for the label of the size bar.

Examples using mpl_toolkits.axes_grid1.anchored_artists.AnchoredSizeBar