Expression

[Marticus Kilverticus]

So long as youre only going between 2 keyframes, make a new slider somwhere with your width on it, then apply this to the strokes width:

width = (pickwhip to a new number slider);
linear(0,10,0,width)

That just replaces 10 with your new sliders value.

[Alex Printz]

I’ve posted code below; just make sure your 2nd key’s value is different than the first key’s value (0px vs 10px).

linear(value, key(1).value, key(2).value, key(1).value, effect("Slider Value")(1))

Alex Printz
Mograph Designer

[Saso Goricar]

Yes, you are both right, I used this linear expression
var y = comp("MOGRT").layer("MOGRT Controls").effect("Slider Control")("Slider")
linear(y,0,20,0,20);
I allowed max 20px of width.

Thanks both for the idea for using this expression, I didn’t know that I could use it this way.

[Saso Goricar]

No, It’s not working. The expression disable keyframes. I can control the width, but the width doesn’t animate from 0 to 20

[Alex Printz]

Use my expression above. The expression posted by the other user isn’t pulling anything from keyframes.

Alex Printz
Mograph Designer

[Saso Goricar]

Now I got it, it works perfectly. Thanks for the help with my problem, it works. Thanks again.