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Ordinal opacity scales #2284

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mbostock opened this issue Feb 20, 2025 · 0 comments · May be fixed by #2285
Open

Ordinal opacity scales #2284

mbostock opened this issue Feb 20, 2025 · 0 comments · May be fixed by #2285
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enhancement New feature or request

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@mbostock
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We support ordinal color scales:

Image 
Plot.legend({color: {type: "ordinal", domain: d3.range(10)}})

But trying to do the same with an opacity scale results in an error:

Error: ordinal opacity scales are not supported

Plot.legend({opacity: {type: "ordinal", domain: d3.range(10)}})

I see no reason we couldn’t support ordinal opacity scales by dividing the range interval [0, 1] equally based on the cardinality of the domain.

Image
@mbostock mbostock added the enhancement New feature or request label Feb 20, 2025
@mbostock mbostock linked a pull request Feb 20, 2025 that will close this issue
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ordinal opacity observablehq/plot
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@mbostock