Maps a rendered fill colour back to the value the colour scale encoded.
A cell mark carries its magnitude only in its fill, so a heatmap's z values
are unreadable without this. Continuous colour scales expose invert;
ordinal ones do not, and are matched against the range instead — which is
also what turns a series colour into its legend label.
Maps a rendered fill colour back to the value the colour scale encoded.
A cell mark carries its magnitude only in its fill, so a heatmap's z values are unreadable without this. Continuous colour scales expose
invert; ordinal ones do not, and are matched against the range instead — which is also what turns a series colour into its legend label.