anchor point, position, scale

Posted by Amit Zinman on October 29, 2008 at 10:09 am

position expression:
;seedRandom(index,true);
ry=thisComp.layer("controller").effect("randomize y")("Slider")
rx=thisComp.layer("controller").effect("randomize x")("Slider")
switch (index%4) {
case 0:
  y = random(transform.position[1],transform.position[1]+ry);
  x = random(transform.position[0],transform.position[0]+rx);
case 1:
  y = random(transform.position[1],transform.position[1]-ry);
  x = random(transform.position[0],transform.position[0]+rx);
case 2:
  y = random(transform.position[1],transform.position[1]+ry);
  x = random(transform.position[0],transform.position[0]-rx);
case 3:
  y = random(transform.position[1],transform.position[1]-ry);
  x = random(transform.position[0],transform.position[0]-rx);


}
x,y
ease(time, inPoint,outPoint, [x-100,y, (index/2)], [200+x,y,(index/2)]) 


scale expression:
fi =thisComp.layer("controller").effect("fade in")("Slider")
fo =thisComp.layer("controller").effect("fade out")("Slider")
si = thisComp.layer("controller").effect("size in")("Slider")
so = thisComp.layer("controller").effect("size out")("Slider")
sf = thisComp.layer("controller").effect("size fade out")("Slider")
if (time < (inPoint+fi)) {
s = ease(time,0,fi,0,si) 
}
else if (time >= fi && time <  (outPoint -fo)) {
  s = ease (time,fi, outPoint - fo,si,so)
}

else {
  s = ease(time,outPoint-fo,outPoint,so,sf) 
}
[s,s]

Hi,
I am animating a bunch text layers. I am trying to simulate 3d without actually using 3d layers, and instead use code to change scale and opacity as well as position.
However, for some reason, x position keeps shifting to the right or left, depending on the anchorpoint. If I switch the position expression off and position the anchorpoint in the middle of the layer everything works well.
Can I use an expression to keep the anchor point at the right place?

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anchor point, position, scale