PS+AE icon表达式初玩（附3个常用表达式）

以下分享几个搜集来的好用的表达式

1.门牌秋千摇晃一样嗒表达式：

n = 0;

if (numKeys > 0){

n = nearestKey(time).index;

if (key(n).time > time){

n--;

}

}

if (n == 0){

t = 0;

}else{

t = time - key(n).time;

}

if (n > 0){

v = velocityAtTime(key(n).time - thisComp.frameDuration/10);

amp = .3;

freq = 1.0;

decay = 2.0;

value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);

}else{

value;

}

2.旋转出现嗒表达式：

bla = 0;

if (numKeys > 0) {bla = nearestKey(time).index;if (key(bla).time > time){bla--;}}if (bla == 0) {t = 0;} else {t = time - key(bla).time;}

if (bla > 0){v = velocityAtTime(key(bla).time - thisComp.frameDuration/10);

amp = 8;freq = 1.0;decay = 2.0;value + (v/100)*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);}else{value;}

3.弹性果冻一样嗒表达式：

amp = .1;

freq = 2.0;

decay = 2.0;

n = 0;

if (numKeys > 0){

n = nearestKey(time).index;

if (key(n).time > time){n--;}

  }

if (n == 0){ t = 0;}

else{t = time - key(n).time;}

if (n > 0){

v = velocityAtTime(key(n).time - thisComp.frameDuration/10);

value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);

   }

else{value}

以上～