• Adobe After Effects Expressions

  Trim path end to position of a null

  Posted by Pontus Danielsson on January 16, 2020 at 1:34 pm

  Hi!
  I’m making a graph that get its data from a json file.

  This is the setup:
  I have a shape layer in a straight line that consists of 100 points.
  Each point is attached to a null object.
  Each null object’s Y position is driven by a json file:
  eval("var SoMe=" + footage("SoMe_total.json").sourceText);

  followers = SoMe[0].jan20;

  min = 0;
  max = 3000000;

  max_movement= -1300;

  newBaseline = 1836;

  y = ((followers-min)/max)*max_movement + newBaseline;

  [y]

  For each month, a new number is added to the json file and the graph therefore continues.

  As for now I have animated a trim path to the shape layer that is controlled by a slider.
  min = 0;
max = comp("Main").layer("GRAPH CTRL").effect("FOLLOWERS GRAPH 2020-2028")("Slider");
if(numKeys > 1){ ease(time,key(1).time,key(2).time,min,max); }else{ max; }

  Here is my question. Since there are 100 null objects (100 points on the shape layer) and the slider goes from 0-100, is there a way to map the slider value (the trim path end) to go to the next null layer?
  So if I type in 53 in the slider, the trim path end would go to the position of null 53…

  I hope i makes sense…

  best regards,
  Pontus

  Pontus Danielsson replied 6 years, 6 months ago 1 Member · 0 Replies
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