Proportions distortion when using motion tweens

[Sketch_Turner]

I have a question about motion tweens. Let's say I have a rectangle and I want it rotating. If I rotate it just by altering the angle of the object, there's this weird little effect: the object becomes smaller during the movement, but regains original proportions before coming to a stop. Is there a way to avoid this kind of bouncy distortion? I realise this problem can be avoided if you rotate the object using a bone, but is that the only solution?

[obtusity]

Ah, you think you have rotated the object, but Moho (Anime Studio) only knows "at the start, the nodes are here, and at the ends, the nodes are here", and moves them linearly from one keyframe to the next - apparently shrinking the object.

For example, let the red rectangle indicate the starting keyframe, the green rectangle indicate the ending keyframe, the cyan lines indicate the path the nodes take, and the black rectangle shows the resulting intermediate object, reduced in size.

Apart from bones, you can reduce this by creating more intermediate keyframes, so the nodes do not follow a linear path.

[hayasidist]

You can also use Bezier interpolation to change the actual shape of the path that the point will follow.

[Víctor Paredes]

And you can also rotate and translate the entire layer instead of the points.

[Sketch_Turner]

Thanks for clarification. It's just that I've never run into this type of problem when using motion tweens in Adobe Animate, so with Moho I initially thought maybe I'm just doing something wrong.

[Greenlaw]

Or you can just bind the shape to a bone and spin the bone. So many choices...

[chucky]

Thanks for clarification. It's just that I've never run into this type of problem when using motion tweens in Adobe Animate, so with Moho I initially thought maybe I'm just doing something wrong.

Yeah you were...