[Dan Ebberts]

2D? If so, try this:

p = position;
n = p.numKeys;
if (n > 0){
  if (time < p.key(1).time){
    v = p.velocityAtTime(p.key(1).time);
  }else if (time > p.key(n).time){
    v = p.velocityAtTime(p.key(n).time);
  }else{
    v = p.velocity;
  }
}else{
  v = p.velocity;
}
radiansToDegrees(Math.atan2(v[1],v[0]))

[Dan Ebberts]

I don’t remember where I got that formula (I don’t think I derived it), but this might help with the math:

https://stackoverflow.com/questions/1734745/how-to-create-circle-with-b%C3%A9zier-curves

[Dan Ebberts]

I think the actual formula for the “magic number” is:

(4/3)*(Math.SQRT2 - 1)

which comes out to about .5523. You were pretty close!

[Dan Ebberts]

In most cases, the result of the expression replaces the static/keyframed value of the property, but wiggle() is a special case. The pre-expression value is included in the result, with the wiggle amount (+ or -) being added to it. So if you’re just interested in the wiggle part, you need to subtract value to isolate the wiggle.

[Dan Ebberts]

I haven’t tested this, but you might just need to separate the wiggle from the original value by changing this:

w= wiggle(f,a);

to this:

w= wiggle(f,a) - value;

[Dan Ebberts]

Does it make any difference if instead of this:

myFrame=time/thisComp.frameDuration+1;

you use this:

myFrame=timeToFrames(time)+1;

[Dan Ebberts]

That's exactly what it is. It's the JavaScript ternary (or conditional) operator. So if cb is true (1 in this case) the result is 90, otherwise it's 77.7.

[Dan Ebberts]

What is it that you’re trying to do?

[Dan Ebberts]

I’m not sure what you want to do with the result, but this expression will fill the frames array with all the frames where a close encounter first occurs. However, on each frame, this expression has to examine the entire comp, so you might want to consider converting the expression to keyframes at some point if processing time becomes an issue:

var rangeMin = 100;
var posDistance = effect("Shortest Distance")("Slider"); 
frames = [];
inRange = false;
for (i = 0; i <= timeToFrames(thisComp.duration); i++) {
  if (inRange){
    if (posDistance.valueAtTime(framesToTime(i)) > rangeMin){
      inRange = false;
    }
  }else{
    if (posDistance.valueAtTime(framesToTime(i)) <= rangeMin){
      frames.push(i);
      inRange = true;
    }
  }
}

[Dan Ebberts]

I think that will look something like this:

cb = thisComp.layer("Expression_Ctrls").effect("Checkbox Control")("Checkbox").value;
leading = cb ? 90 : 77.7;
text.sourceText.style
	.setFontSize(thisComp.layer("Expression_Ctrls").effect("SLIDER-3_REGELS")("Slider"))
	.setAutoLeading(false)
	.setLeading(thisComp.layer("Expression_Ctrls").effect("SLIDER-3_REGELS")("Slider")/100*leading)
	.setAllCaps(true);