Here's the situation: I'm not new to After Effects. I've been using it for a while and I could say I'm an intermediate user. My knowledge is limited to everything but expressions.
So, I have a white solid and a red solid. As the white solid increases width (scale), I want it to push the red solid. I'm not a newbie into programming, however, I'm either an advanced user. My guess on how to do it is the following one: get white's solid left and width properties from anchor point and add them to the X position of the red solid (
red.xPosition = whiteWidth + whiteAnchorLeft). Here's the actual code of my evil creation:
var white = thisComp.layer("white"); var whiteAnchorLeft = white.sourceRectAtTime(time-white.inPoint,true).left var whiteWidth = white.sourceRectAtTime(time-white.inPoint,true).width //[whiteAnchorLeft,whiteWidth] transform.xPosition = whiteWidth + whiteAnchorLeft
This expression is inside of
red > transform > x dimension.
When I try to make this work, I get 1920 as X and it doesn't move. What am I doing wrong? Thanks in advance!
[whiteAnchorLeft,whiteWidth] is commented because After Effects is such an amazing software and it throws an error saying this "method is undefined" (???) althoug I've seen tutorials writing this down in the code.