support angstrom #64
support angstrom #64
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matplotlib_scalebar/dimension.py
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| @@ -25,6 +25,7 @@ | |||
| "\u00b5": 1e-6, | |||
| "u": 1e-6, | |||
| "n": 1e-9, | |||
| "A": 1e-10, | |||
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Angstroms is not a prefix. It should not appear in this list.
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Just wondering how to convert between Angstrom and other units then if not using the _PREFIXES_FACTORS. Create a sperate scaling factors dictionary? and put it a new LengthDimension as the child of _Dimension? Given that except Angstrom all the other units are well covered, so it will be a class with one case only.
matplotlib_scalebar/dimension.py
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| latexrepr = "Å" # Directly add "Å" without appending "m" | ||
| self.add_units(prefix, factor, latexrepr) | ||
| else: | ||
| self.add_units(prefix + "m", factor, latexrepr) |
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I don't think Angstroms should be part of the default SILengthDimension. Angstrom is not an SI unit. Most users will not want to see Angstrom as a unit when drawing a scale bar.
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Indeed Angstrom is not a SI unit, but it is widely used in electron microscopy community for both imaging and diffaraction (reciprocal Angstrom), which is the initial drive for this PR.
matplotlib_scalebar/dimension.py
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| @@ -111,7 +112,11 @@ def __init__(self): | |||
| latexrepr = None | |||
| if prefix == "\u00b5" or prefix == "u": | |||
| latexrepr = _LATEX_MU + "m" | |||
| self.add_units(prefix + "m", factor, latexrepr) | |||
| if prefix == "Å" or prefix == "A" or prefix == "angstrom": | |||
| latexrepr = "Å" # Directly add "Å" without appending "m" | |||
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The correct LaTeX expression would be \AA
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The correct LaTeX expression would be
\AA
sure, this can be easily done. But sometimes the whole string needs to be in the math format like r"$\AA$" to display correctly, thus I put "Å" directly at the moment.
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* Bump CI action versions * Add python 3.12
* Add astronomical length units * add astro-length to README * Fix bugs
…rd#61) * Add a (skippable) check that the axes have equal aspect ratio. When the scalebar is not drawn on an aspect where imshow() has been called (e.g., a point cloud made with plot()), the axes aspect ratio is not automatically set to 1, in which case the scale bar will be wrong (or rather, it will only be correct in the direction (horizontal or vertical) in which it is drawn). To avoid mistakes, add a check for the aspect ratio, emitting a warning when appropriate. The check can be skipped by using new variants for `rotation`: it can now be set to "horizontal-only" ("the scalebar only applies to the horizontal direction") or "vertical-only". (This could also have been a separate kwarg, but something like `check_aspect=False` reads a bit awkwardly to me.) * Try to fix CI --------- Co-authored-by: Philippe Pinard <[email protected]>
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@ppinard please find the class approach of hosting the Å, tried my best to adapt to all the suggestions. |
A minor PR as Å is commonly used in microscopy, would be useful to support it.