This expression will move a vertical bar back and forth across the screen randomly. Create a thin, rectangular solid. Apply the following expression to the position property. tMin and tMax are the minimum and maximum time it takes for the line to mak

random-lines.js

/* This expression will move a vertical bar back and forth across the screen randomly. 
Create a thin, rectangular solid. Apply the following expression to the position property. 
tMin and tMax are the minimum and maximum time it takes for the line to make one movement. 
Adjust them to your needs.
Duplicate the solid a bunch of times to generate a lot of motion. */

tMin = .5; //minimum segment duration 
tMax = 2;  //maximum segment duration

end = 0; 
j = 0; 
while (time >= end){ 
  j++; 
  seedRandom(j,true); 
  start = end; 
  end += random(tMin,tMax); 
} 
endVal = random(thisComp.width); 
seedRandom(j - 1,true); 
x = random(); //this is a throw-away value 
startVal = random()*this_comp.width;
x = ease(time,start,end,startVal,endVal);
[x,value[1]]