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Adding function to an expression
Hi!
So, i’ve been using the following expression (pasting a “short version” of it) to add automatic behaviors to the start/end of a layer, at properties such as opacity.
Now, I had this idea of applying the same expression to the “end” property of a trim path animation. And it does work. Except that… For some properties (e.g. position), I like to shape my speed like this:
And the built in “ease out” function produces nothing of the sort. So, researching over the internet I came across this magnificent site:
http://gizma.com/easing/#expo3
And, in it, I found the following function to be added to my expression:
Math.easeInOutExpo = function (t, b, c, d) {
t /= d/2;
if (t < 1) return c/2 * Math.pow( 2, 10 * (t – 1) ) + b;
t–;
return c/2 * ( -Math.pow( 2, -10 * t) + 2 ) + b;
};The question is: how can I integrate this function to my already working expression?
dur = Math.round(effect("Slider Control")("Slider"));StartIn = inPoint;
StartOut = inPoint + dur;EndIn = outPoint - dur;
EndOut = outPoint;if (time>=StartIn && time <= StartOut)
ease(time,StartIn,StartOut,0,100);
else if (time>=EndIn && time <= EndOut)
ease(time,EndIn,EndOut,100,0);
else
value; -
2 Replies
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I’m not sure if this is what your looking for, but it might be like this:
myEase = function (t, b, c, d) {
t /= d/2;
if (t < 1)
return c/2 * Math.pow( 2, 10 * (t - 1) ) + b;
t--;
return c/2 * ( -Math.pow( 2, -10 * t) + 2 ) + b;
};dur = Math.round(effect("Slider Control")("Slider"));
if (time < (inPoint+outPoint)/2)
myEase(time-inPoint,0,100,dur)
else
myEase(time-(outPoint-dur),100,-100,dur)
Dan
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Man, I love this forum ?
Ended up with my own combined function, to ease cubic in and exponential out. Turns out all I really needed was to get this function thing right. Never used it before.
I’ll share my final result in a simplified version, case anyone desires to make good use of it.
Thanks a lot for your help =)
myEase = function (t, b, c, d) {
t /= d/2;
if (t < 1) return c/2*t*t*t + b;
t --;
return c/2 * ( -Math.pow( 2, -10 * t) + 2 ) + b;
};dur = 1
myEase(time-inPoint,1,100,dur)
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