[Dan Ebberts]

I don’t know of a way to access the mask mode from an expression. If you find out that there is a way, please come back and post it!

[Dan Ebberts]

This example will ramp from the number in layer “Text 1” to the number in layer “Text 2” (both formatted with commas) over the period defined by variable dur, starting at the time defined by variable tStart and format the result with commas:

dur = 5;
txt1 = thisComp.layer("Text 1").text.sourceText;
n1 = parseFloat(txt1.replace(/,/g, ''));
txt2 = thisComp.layer("Text 2").text.sourceText;
n2 = parseFloat(txt2.replace(/,/g, ''));
tStart = inPoint;
tEnd = tStart + dur;
n = linear(time,tStart,tEnd,n1,n2);
parseInt(n,10).toLocaleString()

[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?