RFR: 8372203: Piecewise linear easing function

[Michael Strauß]

On Wed, 19 Nov 2025 21:36:36 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

> Implementation of the [linear](https://www.w3.org/TR/css-easing-2/#the-linear-easing-function) easing function, which is now widely supported by all browsers, but still missing in JavaFX.
> 
> It allows developers to approximate arbitrary easing functions with linear segments:
> 
> 
> linear(
>     /* Start to 1st bounce */
>     0, 0.063, 0.25, 0.563, 1 36.4%,
>     /* 1st to 2nd bounce */
>     0.812, 0.75, 0.813, 1 72.7%,
>     /* 2nd to 3rd bounce */
>     0.953, 0.938, 0.953, 1 90.9%,
>     /* 3rd bounce to end */
>     0.984, 1 100% 100%
>   )
> 
> 
> <img src="https://github.com/user-attachments/assets/73aac0d4-0185-47c5-8791-bdb247eb69c8" width="400"/>

Maybe we should retire the weird naming scheme used in this class (uppercasing the name of methods), or at least not proliferate it any further. So instead of `LINEAR(Point2D...)` we would have `ofLinear(Point2D...)` or `linear(Point2D...)`. We could add similar variants for the rest of the weird methods (`SPLINE()`, `TANGENT()`, `STEPS()`).

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PR Comment: https://git.openjdk.org/jfx/pull/1977#issuecomment-3566227558