Add a 'wrap' mode to Animation and AnimationWidget

[alisterburt]

What do we think about a 'wrap' mode for animations, you define the 'forward' pass and the rendered animation also contains the reverse for a nice loop.

I was thinking a bool attribute of the Animation class, exposed by a checkbox in the AnimationWidget.

That bool being set to True would modify a copy of the keyframe dict within Animation.animate to provide the reverse direction.

This approach is naive and would involve rerendering every frame but I don't know how I would reuse frames with the current state generator

[sofroniewn]

Ah to make "continuous movies"? I'd probably think about an enum. You might also just want a "loop" where you add the first frame on to the end of the list so that it ends and starts in the same place without doing the forward and reverse, though I can see how both are desirable.

For going in "reverse" I'd try to avoid copying the whole keyframe dict, but maybe you can just traverse it backwards with appropriate flags/ settings inside _state_generator which could now take a reverse=False bool input and if true you could do a 1-fraction in the appropriate place. Inside _frame_generator you could then call _state_generator twice, or add in that extra frame from the beginning depending on the "mode"

[alisterburt]

Yeah exactly - that sounds good! I'll play with this once I'm a bit further on the `KeyFramesListWidget`

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On Wed, 13 Jan 2021 at 05:06, Nicholas Sofroniew ***@***.***> wrote: Ah to make "continuous movies"? I'd probably think about an enum. You might also just want a "loop" where you add the first frame on to the end of the list so that it ends and starts in the same place without doing the forward and reverse, though I can see how both are desirable. For going in "reverse" I'd try to avoid copying the whole keyframe dict, but maybe you can just traverse it backwards with appropriate flags/ settings inside _state_generator which could now take a reverse=False bool input and if true you could do a 1-fraction in the appropriate place. Inside _frame_generator you could then call _state_generator twice, or add in that extra frame from the beginning depending on the "mode" — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <https://github.com/sofroniewn/napari-animation/issues/13#issuecomment-759208117>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABXYBYFBDSVOS5BAE3S5QEDSZUS4VANCNFSM4V56QQNQ> .