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# Thread: Constraining a Line Based Family

1. ## Constraining a Line Based Family

The attached file is a line-based generic family.

Anyone know how to change the 'width' property without it pulling off the origin?

https://www.dropbox.com/s/tv1c2kl5d9tfq4u/test.rfa?dl=0

I've reached a dead end. :|

Basically want the width parameter to drive the 'Length' and 'Reporting' parameter.

2. You need to constrain the right end of the line to the reference plane on the right.
The rest is a case of trigonometry, that you can solve using Munkholm's diagrams for triangles in the Revit Formulas for every day thread.
First, you need to find distance "c". You know angle "A" and you know distance "b" (your Width).
Once you find "c", make the built-in Length parameter equal to "c".
Now "c" (your Width), can drive "Length".

3. Hi Alfredo,
Unfortunately it still breaks for me.
https://www.dropbox.com/s/8bzue8ghzk...test2.rfa?dl=0

4. Originally Posted by theoryshaw
The attached file is a line-based generic family.

Anyone know how to change the 'width' property without it pulling off the origin?

https://www.dropbox.com/s/tv1c2kl5d9tfq4u/test.rfa?dl=0

I've reached a dead end. :|

Basically want the width parameter to drive the 'Length' and 'Reporting' parameter.
Haven't downloaded it. For for a LBGM there are too many constraints there. You can constrain that angle, or that width. No need to do both. And reporting isn't needed either.

Sent from my Pixel 3 XL using Tapatalk

5. Phew, got it.

Thanks Aaron and Alfredo.

Video on how it was done: https://www.dropbox.com/s/mobxdbf6rr...Array.mp4?dl=0

Angled parking family that was created: https://github.com/OpeningDesign/BIM...20Improvements

Didn't necessary need a LBGM either.

Cheers, Ryan

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