x y scale bar

[k1moradi]

Hi,

I was wondering is it possible to add two scale bars: one for the x-axis and another one for the y-axis. The x-axis of my plot is in milliseconds and the y-axis in pico ampers.

I have generated the following plot but, I want the unit of the plot being "ms" which the program does not allow. I also want to add another scalebar for the y-axis, so that I can hide the axis.

scalebar = ScaleBar(1, label='ms', location='lower right')
plt.gca().add_artist(scalebar)

[ppinard]

Hi, two-part answer. First, you can have as many scalebars as you want in a figure, but currently there is no way to draw a vertical scale bar. I will try to see whether this can be added to the library. Secondly, millisecond (or the base units second) is not a known "length" dimension so you need to define your own Dimension class.

import matplotlib.pyplot as plt
from matplotlib_scalebar.scalebar import ScaleBar
from matplotlib_scalebar.dimension import _Dimension, _PREFIXES_FACTORS, _LATEX_MU


class TimeDimension(_Dimension):
    def __init__(self):
        super().__init__("s")
        for prefix, factor in _PREFIXES_FACTORS.items():
            latexrepr = None
            if prefix == "\u00b5" or prefix == "u":
                latexrepr = _LATEX_MU + "s"
            self.add_units(prefix + "s", factor, latexrepr)


plt.figure()
plt.gca().add_artist(
    ScaleBar(5, units="ms", dimension=TimeDimension(), location="lower right")
)

plt.savefig("example_dimension.png")

[k1moradi]

Thanks for the suggestions!

I will try to see whether this can be added to the library.

I hope everything works out since I still need this feature.

[NickleDave]

Not sure if it helps but this AnchoredScaleBar from @dmeliza adds a vertical component

https://gist.github.com/dmeliza/3251476

Haven't figured out the logic for rotation myself -- I need something similar

[k1moradi]

Not sure if it helps but this AnchoredScaleBar from @dmeliza adds a vertical component

https://gist.github.com/dmeliza/3251476

Haven't figured out the logic for rotation myself -- I need something similar

Thanks for letting me know about this! It works.

[ppinard]

I just merged some changes to allow a "vertical" scale bar. See help documentation: https://github.com/ppinard/matplotlib-scalebar#rotation. I will release a new version of matplotlib-scalebar to PyPI in the coming week.

[k1moradi]

I just merged some changes to allow a "vertical" scale bar. See help documentation: https://github.com/ppinard/matplotlib-scalebar#rotation. I will release a new version of matplotlib-scalebar to PyPI in the coming week.

Thank you for the update and happy new year!

[ppinard]

Now in release 0.7.0. Please close the issue if the solution works for you. Happy new year as well!