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Animation APIs parameterized by eg duration and curve are fundamentally opposed to continuous, fluid interactivity.

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What’s wrong with additive keyframes? No velocity but still youtube.com/watch?v=M-8_9v source

You have a .5s toggle animation. Interrupt it halfway through using additive anims and it takes full .5s to go half as far.

Indeed, every animation has same duration. But distance travelled > half. Additive path is not linear.

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Sure, I know. My point is that v(t) doesn't vary in a predictable or designed way with interruption timing.

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I admit my physics was lame, but maybe altering the spring timing function based on velocity could be a solution?

Yeah, that's basically what POPSpringAnimation does. There's no duration in that model though.

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