How to link opacity with trim path speed

Question

Hi,

I am experimenting expressions. so I have done bar animation with digits. Suddenly I feel like why not making the digits start animating from invisible to visible. I mean when the bar animation will start the digits will come into existance. then I link the opacity of the digits with trim path 'end'. But the opacity is not producing what I imagined. Then I realized opacity is taking trim path's movement exactly on same increment. I mean when trim path end value is 10 the digit's last opacity percentage will mimic that. because both range from 0-100.

then I multiply the opacity expression *10. beacuse I knwo I can apply basic math on expression.

Am I thinking right? or totally miscalculate it? or there is some other way I can pull what i imagined. Please guide me. I want the opacity of digits to start from 0 - 100 as the trim bar progresses, both (opacity speed and trim path's speed need to be same).

Dan Ebberts · Answer

I think I'd try something like this for Source Text:

thisComp.layer("42").content("Trim Paths 1").end.key(2).value

and this for Opacity:

val = thisComp.layer("42").content("Trim Paths 1").end;
linear(val,0,val.key(2).value,0,100)

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