Is this Font Size Expression possible?

[Daniel30221866kgrp]

I want to set up an expression where I can control the font size, but I want to limit how small/big that font size can go to using the slider. Is this possible?

For example.... If I want to limit the user to a range between 20 and 50 using the slider.

Appreciate any insight that could be provided!

[Mylenium]

A simple linear(slider value, min, max) will do or alternatively a JS math clamp().

Mylenium 

[Daniel30221866kgrp]

So something like this would work?

clamp(value, min=20, max=20)

[Daniel30221866kgrp]

I'm also reading that connecting the font size to a slider expression isn't possible.... just the font scale is possible.

My attempts so far have given errors. If it is possible, how should the coding look?

[Dan Ebberts]

Something like this for source text should do it:

sl = effect("Slider Control")("Slider");
style.setFontSize(clamp(sl,20,50))

[Daniel30221866kgrp]

Sorry.... still new to the coding aspect of expressions...

If I pickwhip the source text to the slide expression on a Null layer, I get this as a result - 

thisComp.layer("Slider").effect("Slider Control")("Slider")

I'm assuming that I have to do something like this to connect it all together - 

thisComp.layer("Slider");
sl = effect("Slider Control")("Slider");
style.setFontSize(clamp(sl,20,50))

Unfortunately, I'm getting an error and I'm unsure what is throwing it. Thank you again for this help. I want to learn this better and understand it better.

[Dan Ebberts · Accepted solution]

In that case, it would be like this:

sl = thisComp.layer("Slider").effect("Slider Control")("Slider");
style.setFontSize(clamp(sl,20,50))

[Daniel30221866kgrp]

Now it's working. I thought I tried a version like that, but I kept getting an error. Thank you very much!