• Adobe After Effects Expressions

  graph style color change and position change

  Posted by Andy Engelkemier on June 20, 2011 at 6:25 pm

  I’ve got 9 bars where I want a few lines to travel up and down and change to red at the top and green at the bottom.

  I created a null object [index 1] for all of my controls.

  each indicator bar has a ColorBalance HLS, so I could script on the Hue section. It ended up being simple calculations, so I got lucky there.

  I create these expressions, but was hoping there might be a better way, like being able to do it by making the slider name equal to the layer name or something so I could just duplicate the layer?

  For now I have to rename each expression.
  Notice in the example, “height 9” is the slider which goes from 0-100

  Is there a way to do this so I don’t have to go through and change the expression on each layer manually?

  Note: I’m asking this for Learning purposes only. I’m just trying to learn new things so in the future I can create things in more efficient ways, and maybe help a few other people with similar issues. I know this might be dumb for only 9 layers, so give me a break just this once forum troll.
  Thanks

  example for height bar #9 of 9
________________________________
Expression: Hue
control = thisComp.layer("controls").effect("height 9")("Slider");
-1 * control;

  Expression: Position
  X = transform.position[0];
  timesMe = 2.9 ;
  control = thisComp.layer("controls").effect("height 9")("Slider");
  Y = transform.position[1] + 1*-( control *timesMe );
  [X,Y];

  Andy Engelkemier replied 15 years, 2 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  June 20, 2011 at 7:40 pm

  If you make the bar layer names the same as the control names, you should be able to just do this:

  control = thisComp.layer(“controls”).effect(name)(“Slider”);

  Dan
• 

  Andy Engelkemier

  June 20, 2011 at 7:50 pm

  Thanks Dan.

  I knew it was something simple like that which I just didn’t know.

  That would have saved me some time had I known that sooner.
  I’m going to go back and edit that portion tomorrow just to ensure it sinks in for next time.

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