Animation APIs parameterized by eg duration and curve are fundamentally opposed to continuous, fluid interactivity.
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I think I agree, but you can get continuous velocity with additive duration and curve animations… what else do you need?
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Problem there is durations. You've got a 0.5s toggle animation; you interrupt halfway through; now it moves at half speed.
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I see; the fundamental issue is additive animation systems don't respond well to having animations removed and re-started.
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That sounds right. The notion of "re targeting" makes more sense to me than "removing and adding"
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if you want to retarget, you don't need to remove the old animation. Add a new one from the old animation's destination.
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So it's frustrating that there isn't a nice declarative expression for that underlying pattern...
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