How to control the width of a rectangle with control of cursor by using expression

I have a simple rectangle shape layer I want to control (only the width) with slider control by using expression. How do I do that?

Thanks in advance.

You can try something like this for an anchor:

w = content("Rectangle_1").content ("mapped Rectangle 1") .size [0];

[w/2, value [1]]

Dan

Tags: After Effects

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