feature: Add anticipation to the animation

[ColinKennedy]

Currently, the cursor moves from point A to point B in a straight line. To make the cursor feel more organic and alive, it'd be awesome to add some anticipation to the transition animation.

Here's a visual to explain: https://www.youtube.com/watch?v=7KRjpIkMw2k

Before any movement, there is a period of "gathering energy" where the subject actually has to move in the opposite direction, at least a little bit.

Before:

                1
    A ----------------------> B

After:

 1              2
<-- A ----------------------> B

It also increases the "impact" on the viewer because the cursor would travel further in less time.

It'd be cool if this is customizable in smear-cursor's settings. e.g. opts = { movement = { anticipation = 0.05 } } as in "for every movement, move 5% in the other direction first"

[sphamba]

Interesting! We could also have overshooting, or even allow to set a custom function for the path from A to B. I'll keep that in mind

[ColinKennedy]

True, that'd also be a nice addition too!