Function withOpacity

Does a computation with the opacity of a colour, returning colour.

Passes operation to HslSpace or SrgbSpace depending on space of colourish.

Param: colourish

Colour

Param: fn

Function that takes original opacity as input and returns output opacity

withOpacity<T extends Colourish>(
    colourish: T,
    fn: (scalarOpacity: number) => number,
): T extends string
    ? string
    : T extends Hsl
        ? Hsl
        : T extends OkLch ? OkLch : T extends Rgb ? Rgb : never
Does a computation with the opacity of a colour in a RGB structure
Type Parameters
- T extends Colourish
Parameters
- colourish: T
  Colour
- fn: (scalarOpacity: number) => number
  Function that takes original opacity as input and returns output opacity
Returns T extends string
    ? string
    : T extends Hsl
        ? Hsl
        : T extends OkLch ? OkLch : T extends Rgb ? Rgb : never
- Defined in visual/src/colour/math.ts:53