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Left to right, easy swap the black and white prototype clips (A & C) and animate the other way i.e. 4.5 -> 1.5! Up and down is just as easy, use a StackVertical and buzz the vertical crop parameters of the resizer instead of the horizontal .
Compact function, with parameters, very do-able. The structure of the script reflects how I wrote it. I first threw together the sliding mask clip without any reference to a supplied clip, hence the Hi and Wi. In a practicle script I would have used Height(clip) and Width(clip) and the X and Y would have been real loaded from real files not coloured BlankClips with text.
As I said hack the rough scripts Wilbert and I composed and build them into something more flexible and polished. You can't break anything, worst that happens is you get a script that doesn't quite do what you want. So you modify it some more.
If you make a genuine effort to put together and polish a general script I will help you.
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