Animation APIs parameterized by eg duration and curve are fundamentally opposed to continuous, fluid interactivity.
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It’s long struck me as odd. Reminds me of cut scenes in 90s video games, complete with the “get on with it” experience.
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they have the benefit of making it easy to define complex effects tho. Physics-based animation APIs seem much harder to use.
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Yep. Pop's got some affordances which help that, but it's still an open problem.
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what's an alternative style that's suitable for UI? Or should we do UI animation with game and film tools?
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One alternative is specifying a target for a continuous integrator (c.f. POPSpringAnimation).
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I actually gave a talk on additive animations at WWDC (c.f. "Building Interruptible…" @ developer.apple.com/videos/wwdc/20). (cont…)
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(Aside: I enjoyed your example visuals in that video. It's a difficult topic to explain; I struggled with that in the WWDC talk)
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