• Adobe After Effects Expressions

  Scale based on location/position

  Posted by Mike Olson on April 13, 2012 at 5:02 pm

  Help , please…

  I have a horizontal row of images, all attached to a null. I need to move the position of the null horizontally and as each image gets to the center of the comp, it needs to scale up by a small percentage.

  I’m not finding exactly what I need on this forum so any help would be greatly appreciated.

  Dan Ebberts replied 6 years, 2 months ago 3 Members · 4 Replies
• 4 Replies

• 

  Dan Ebberts

  April 13, 2012 at 5:43 pm

  This will increase the scale by 25% as the layer approaches the horizontal center of the comp:

  pct = .25; // increase by 25%
  r = 100; // distance to being increasing scale
  center = thisComp.width/2;
  p = toWorld(anchorPoint);
  d = length(p,[center,p[1]]);
  mult = ease(d,0,r,pct,0);
  value*(1+mult)

  Dan
• 

  Mike Olson

  April 13, 2012 at 6:17 pm

  Brilliant!

  Thank you!
• 

  Lizzy Rowlatt

  July 16, 2020 at 7:28 am

  Hi Dan, how would I adjust this to scale as it approaches the vertical?
• 

  Dan Ebberts

  July 16, 2020 at 5:47 pm

  I haven’t tested it, but it should be like this:

  pct = .25; // increase by 25%
  r = 100; // distance to begin increasing scale
  center = thisComp.height/2;
  p = toWorld(anchorPoint);
  d = length(p,[p[0],center]);
  mult = ease(d,0,r,pct,0);
  value*(1+mult)

  Dan

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