Changing Scale of Child relative to Parents H/W

[Philip Neves]

That’s a cool effect and I want to steal it. ☺

I played with it and put something together that might be similar what you want. (You may have to adapt things for your project layout though — mostly because I didn’t understand what your slider was doing.)

In a comp with a 1920×1920 (or other square) solid and a centered text layer as a child:

1. Add two Slider controls to the solid named “h” and “w” with values of 100.
2. Add this expression to the solid’s scale:


h = effect("h")("Slider");
w = effect("w")("Slider");
[w,h]


3. Add this expression to the text layer’s scale:


w = parent.scale[0];
h = parent.scale[1];
xfac = (w)/100;
yfac = (h)/100;
q = Math.min(xfac,yfac)

s1 = 100*value[0]/w*q;
s2 = 100*value[1]/h*q;

[s1,s2]


The text layer will scale uniformly with the smallest dimension of the solid and retain its position relative to the solid. You can shift the solid’s anchor point to have it scale from a side instead of the center.

Helpful, or missing the point?

[Philip Neves]

Missed the cross-post, anyway.

Dan Ebbert’s solution is probably better (not a huge surprise)… mine has issues when you animate and it crosses over from scaling based off one dimension to scaling based on the other.

https://forums.creativecow.net/thread/227/36108

[Sean Dunn]

Sorry about that, but thank you so much for the help!