How to find the bounding box of a shape?

Forum|Forum|1 year ago
January 31, 2025
2 replies
1013 views

I have a layer with multiple shapes in it.
How to find the bounding box of a shape made out of bezier curves, like this one:

I can see vertices and tangents info inside value property, but nothing similar to

sourceRectAtTime for a layer.
Computing bounding box of a concave shape is rather difficult.

H

Hani ElTiby

Inspiring

if you can't find a method to it, then you may write a function do do so
- get the specific shape
- get all it's points positions
- get the min and max of all the x values
- get the min and max of all the y values
- lastly the min x and y is the the top left corner of the bounding box, and the max x and y is the bottom right

S

sergey_1079Author

Participating Frequently

That will only work for convex shapes, not for concave ones, as you see on the image.

H

Hani ElTiby

Inspiring

Honestly I didn't try it, but I believe logically it would get the bounding box of the shape even if it's a flat line. Unless ae scripting has limitations to prevent this logic from happening.

I'll give it a try.

ShiveringCactus

Community Expert

Just to check, but are you saying you can't use SourceRectAtTime().width:

thisComp.layer("Shape Layer 1").sourceRectAtTime().width

Because I just did a quick check using expressions, and it worked for me. So I think I might be misunderstanding.

S

sergey_1079Author

Participating Frequently

That works for a layer bounding box, I'm asking about an individual shape bounding box

S

sergey_1079Author

Participating Frequently

and I looking for JSX API solution to put the code into an extension, rather that an expression

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