how to write expression in such case -15 (trim path looping randomly)

Question

Hi,

I want to loop the start and end of trim path but randomly for each line.. like line 1 start it's loop at 2 second, line 3 at 4 second. and none of them will overlap with one another's animation timing, I mean suddenly line 2 start its loop and line 3 and line 1 are not looping, again when line 1 looping line 2 and 3 not animating. . they will happen solo at their own time. And I want this to continue for as long as the main comp goining on, say 20 second, each line will be in a loop but different timing... . How can I write the expression? Thank you.

Dan Ebberts · Accepted Answer

Here's an example. It's probably not exactly what you're after, but it might be close enough to get you started. Add a null, name it "Controls" and add a Point Control named "Line and Percent". Add this expression to the Point Control:

minLine = 1; // minimum line number participating
maxLine = 3;  // maximum line number participating
runDur = 1; // duration of animation time

seed = Math.floor((time-inPoint)/runDur);
seedRandom(seed,true);
curLine = Math.floor(random(minLine,maxLine + 1));
curPct = (((time-inPoint)%runDur)/runDur)*100;
[curLine,curPct]

For each of the line shape layers (named in the format "Line n") add this expression for the Trim Path's Start parameter:

ctrl = thisComp.layer("Controls").effect("Line and Percent")("Point");
curLine = parseInt(ctrl.value[0],10);
curPct = ctrl.value[1];
if (curLine == index){
  ease(curPct,20,100,0,100)
}else
0

and this for the End parameter:

ctrl = thisComp.layer("Controls").effect("Line and Percent")("Point");
curLine = parseInt(ctrl.value[0],10);
curPct = ctrl.value[1];
if (curLine == index){
  ease(curPct,0,30,0,100)
}else
0

You may need to fiddle with the numbers.

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