• Adobe After Effects Expressions

  X scale by time

  Posted by Harald Weist on December 20, 2019 at 12:01 pm

  Hi there
  i´m a newbee and have a question. i try to tweak an expression i found here.
  It works fine but it scales in both directions. it should only scale in x direction but never under 100%. tnx in advance
  *h

  segMin = 1; //minimum segment duration
segMax = 5; //maximum segment duration
minVal = 100;
maxVal = 130;

  end = 0;
j = 0;
while ( time >= end){
j += 1;
seedRandom(j,true);
start = end;
end += random(segMin,segMax);
}
s = random(minVal,maxVal);
endVal = [s,s];
seedRandom(j-1,true);
dummy=random(); //this is a throw-away value
s = random(minVal,maxVal);
startVal = [s,s]
ease(time,start,end,startVal,endVal)

  Harald Weist replied 6 years, 9 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  December 20, 2019 at 5:25 pm

  Try it this way:

  
segMin = 1; //minimum segment duration
segMax = 5; //maximum segment duration
minVal = 100;
maxVal = 130;

  end = 0;
j = 0;
while ( time >= end){
j += 1;
seedRandom(j,true);
start = end;
end += random(segMin,segMax);
}
endVal = random(minVal,maxVal);
seedRandom(j-1,true);
dummy=random(); //this is a throw-away value
startVal = random(minVal,maxVal);
s = ease(time,start,end,startVal,endVal);
[s,value[1]]


  Dan
• 

  Harald Weist

  December 20, 2019 at 5:52 pm

  Hey Dan
  you nailed it !! Works perfect,
  tnx *h

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