alphaChannel static method
Considers the provided number(?) strength
.
If strength
is between 0..1
, the return is an appropriate int
for
the alpha channel representing that strength as an opacity multiplied by
the max channel value 0xFF
.
After that check, if strength
is an int or double, the return is
strength
.
If all else fails, the return is null
; say, if provided strength
itself is also null
.
Implementation
static int? alphaChannel(num? strength) => alphaFromStrength(strength);