Synfig Issue Tracker ~ [OPEN] #45 - Moving keyframe produces unneeded waypoints

Synfig Issue Tracker

OPEN Bug report #45 - Moving keyframe produces unneeded waypoints

Posted Dec 14, 2012 - updated Jan 05, 2019

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Issue description

Konstantin Dmitriev:

When I moving keyframe, it sometimes places unneeded waypoints.

I attached an example file which could help reproduce this behavior.

Steps to reproduce this issue

Open file Eyes03.sifz
In "Canvas Browser" panel double click on exported canvas named "eyes" to open it's window
In the "eyes" canvas window zoom to eyes image to see them better :)
On Layers panel: select "eye outline" layer inside the "right eye" paste canvas.
On Timetrack panel you could see, that there is no waypoints for selected layer for "n1", "n2", "n3" keyframes.
Now select the "n2" keyframe on Keyframes Paneland change it's time from '3s 12f' to '3s 13f'
You will see what waypoints will be placed for keyframes "n1", "n2", "n3". Those waypoints contain equal values and not really needed. But because the TCB interpolation type this result in fluctuation near the "n1" keyframe.

NOTE: you will get unneeded waypoints even if "Lock keyframes" is in "No keyframes locked" state, but only for "n2" keyframe.

NOTE2: Only way I found to prevent fluctuations which have place because of unnecessary waypoints, is to set "Default interpolation" to "Constant" just before do moving keyframe.