Facet with varying scales? about plot HOT 5 OPEN

It would be great if this could be implemented. It's common to have a categorical scale where not all categories appear in all facets, so you want to hide the unused categories in some facets to save space.

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Here's an initializer that rescales y on every facet. It doesn't really have access to the scale’s type yet, but it's a great use case to have the scale’s definition passed in properly here too (in #1263).

scalefreeY = (options) =>
  Plot.initializer(options, (data, facets, channels, scales, dimensions) => {
    const {y: { value: Y, scale }} = channels;
    for (const index of facets) {
      const y = d3.scalePoint(d3.sort(Array.from(index, (i) => Y[i])), [
          dimensions.marginTop,
          dimensions.height - dimensions.marginBottom
        ])
        .padding(0.5);
      for (const i of index) Y[i] = y(Y[i]);
    }
    return { data, facets, channels: { y: { value: Y } } };
  })

suggested by @MayaGans

from plot.

Related #149.

from plot.

Similarly would be nice to allow a projection to have a different domain for each facet.

from plot.

related #501

from plot.