docs: Add example of reordering stacked bars #3395
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tests/examples_arguments_syntax/interactive_reorder_stacked_bars.py
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tests/examples_arguments_syntax/interactive_reorder_stacked_bars.py
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tests/examples_arguments_syntax/interactive_reorder_stacked_bars.py
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Co-authored-by: Stefan Binder <binder_stefan@outlook.com>
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Thanks @binste ! I updated with your suggested changes. |
| source = data.barley.url | ||
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| alt.Chart(source).mark_bar().transform_calculate( | ||
| site_order=f"if({selection.name}.site && indexof({selection.name}.site, datum.site) !== -1, 0, 1)" |
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Im fine with current approach, but an observation is that this is JavaScript syntax. I'm not sure if the Python syntax for this type of Vega expressions is more readable.
While often underestimated in efficiency, we don't really have a good approach documented to work with these Vega expressions.
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Yes, @jonmmease made a similar comment in #3362 (comment) and I would also prefer to change to the Python syntax in general in the docs. However, I think we should solve #3366 first, so that the Py syntax covers everything that the JS syntax can do (this instance is the only difference I'm aware of).
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Ah, yes, I remember being bitten by this recently too!
This example shows how to reorder bar segments via a click interaction in the legend. Credit to @dwootton who came up with the spec in this very neat tweet which I modified slightly to include opacity changes and to allow for sorting multiple segments.
recording-2024-04-06_16.42.20.mp4