RFR: 8372203: Piecewise linear easing function [v2]

[Michael Strauß]

On Fri, 21 Nov 2025 22:04:34 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> modules/javafx.graphics/src/main/java/com/sun/scenario/animation/LinearInterpolator.java line 198:
>> 
>>> 196: 
>>> 197:         // Linearly interpolate (or extrapolate) along the segment (ax, ay) -> (bx, by).
>>> 198:         if (ax == bx) {
>> 
>> FP alert: is it possible for `ax != bx` yet the result of division on L203 to produce an infinity?
>
> jshell> 1 / 9e-310
> $25 ==> Infinity

I've added code to ensure that when an infinity is unavoidable, we at least get an infinity consistent with the line (and not, say, NaN). While this makes this interpolator locally consistent, we may still end up passing infinities into the animation system, so it's not a catch-all solution (that would be a completely different thing that we're not going to solve in interpolators).

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PR Review Comment: https://git.openjdk.org/jfx/pull/1977#discussion_r2552853988