toFluentShades

Turns a tonal ramp into the seven shades Fluent themes from.

Fluent ships one accent, Windows blue, and generateShades is a lookup with a single entry, so any other accent silently comes back as that blue. This is the way round it. Give Fluent a ramp that was generated rather than looked up.

The tones below are anchored to the lightness of Microsoft's own Windows blue family, rounded to the nearest five.

Microsoft's ramp shifts hue as it goes, 64 degrees from the darkest shade to the lightest, and a tonal palette holds hue steady. So this matches the lightness of that ramp and not its hue. The result is a ramp of one color rather than a reproduction of the Windows one, which is what you want from a generated accent anyway.

A seed with little chroma gives a Fluent theme with little chroma. A grey seed produces seven greys, which is the ramp doing its job rather than a fault.

// Fluent themed off the scheme's secondary ramp rather than its primary.
val shades = scheme.secondaryPalette.toFluentShades()
FluentTheme(colors = Colors(shades, darkMode = scheme.isDark)) {
    Text("Themed from the secondary ramp")
}