Additional option to tween by speed

[marcusx2]

It would be nice if we could pass a speed parameter for tweening instead of duration. It would be useful if you want to move from point x to point y at a constant speed regardless of the distance of said points. With only the duration, a movement tween can happen faster or slower depending on the distance between point x and point y.

[yaustar]

Going at a constant speed isn't a tween. Tweening in animation is a short for inbetweening and it's the process of generating images that go between keyframes.

Keyframes are on a timeline so having an option to tween by speed doesn't make sense for a tweening library.

It's sounds like you want something like Unity's MoveTowards function. If so, you can get the code from the Unity GitHub repo where they've made their C# code public.

[marcusx2]

Well I've seen plenty of tweening libraries with this option before, even if it's not technically tweening.

[yaustar]

Can you link to them please? It will help with working out what API people are used to if we do implement something like this.

[marcusx2]

Well if the user provides the speed you can get the time with time = (distance / speed) * dt; right? The distance variable will change based on what you are trying to tween. If it's a movement tween distance is really the distance between two vectors, but if you are trying to tween, idk, the color of something, distance will be something else. But that's the gist of it.

Hm let's see an example http://dotween.demigiant.com/documentation.php. Search for Tweener-specific settings and options and then look into the SetSpeedBased option.

[yaustar]

Yeah, this is the part where I feel like it doesn't belong in a tween library:

It basically becomes a standard lerp as it the easing option are basically ignored which is the main feature.

I can see a case for it all that said so consideration will be given to add this or consider a PR

[marcusx2]

as it the easing option are basically ignored which is the main feature.

Only if the interpolator is linear.