lerp static method
Linearly interpolates between two font weights.
Rather than using fractional weights, the interpolation rounds to the nearest weight.
If both a and b are null, then this method will return null. Otherwise,
any null values for a or b are interpreted as equivalent to normal
(also known as w400).
The t argument represents position on the timeline, with 0.0 meaning
that the interpolation has not started, returning a (or something
equivalent to a), 1.0 meaning that the interpolation has finished,
returning b (or something equivalent to b), and values in between
meaning that the interpolation is at the relevant point on the timeline
between a and b. The interpolation can be extrapolated beyond 0.0 and
1.0, so negative values and values greater than 1.0 are valid (and can
easily be generated by curves such as Curves.elasticInOut). The result
is clamped to the range w100–w900.
Values for t are usually obtained from an Animation<double>, such as
an AnimationController.
Implementation
static MacosFontWeight? lerp(
MacosFontWeight? a,
MacosFontWeight? b,
double t,
) {
if (a == null && b == null) {
return null;
}
return values[_lerpInt((a ?? normal).index, (b ?? normal).index, t)
.round()
.clamp(0, 8)];
}