lerpTo method
- @protected
Linearly interpolates from this to another Gradient.
This is called if b's lerpTo did not know how to handle this class.
When implementing this method in subclasses, return null if this class
cannot interpolate from b. In that case, lerp will apply a default
behavior instead.
If b is null, this must not return null. The base class implements this
by deferring to scale.
The t argument represents position on the timeline, with 0.0 meaning
that the interpolation has not started, returning this (or something
equivalent to this), 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 this 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).
Values for t are usually obtained from an Animation<double>, such as
an AnimationController.
Instead of calling this directly, use Gradient.lerp.
Implementation
@protected
Gradient lerpTo(Gradient b, double t) {
if (b == null)
return scale(1.0 - t);
return null;
}