position expression

[Dan Ebberts]

Just a guess, but one of your Math.exp() calculations may be overflowing. That will happen if kx*t or ky*t becomes greater than 710 or so.

Dan

[Ivan Semchuk]

Thank you for reply.
Just fore note: added this expression to text layer.
sx starting from 1st second to 5th gives “NaN” result.
sy is OK always!

[George Goodman]

the thing that is causing your error is this line:

S=100/comp(“MapLayers”).layer(layer).scale[0];

Just tack on a -1 so you don’t divide 100/00

I’m not exactly sure what you’re trying to do with it, but I hope that helps.

S=100/comp("MapLayers").layer(layer).scale[0] - 1;

“|_ (°_0) _|”

Sincerely,

George

http://www.vimeo.com/georgegoodman
http://www.linkedin.com/in/georgefranklingoodman

[Ivan Semchuk]

Thank you. But it doesn’t work(
I understood that “sy” works, but not “sx”!
So I separated coorinates to see less code)
Still no guess what is vrong with divide by zero!

layer = "17";
S=100/comp("MapLayers").layer(layer).scale[0];
x1=640;
x2=x1+S*(comp("MapLayers").layer("1").position[0]-comp("MapLayers").layer(layer).position[0]);
t1=1;
t2=5;

if (time <= t1){
sx = x1;
}else if (time > t1 && time < t2){
t = time - t1;
T = t2 - t1;
kx = Math.log(x2/x1)/T;
sx = x1*Math.exp(kx*t);
}else{
sx = x2;
}
sx

[George Goodman]

I didn’t get the error after I tacked on the -1, however, you didn’t define lt in the variables so I removed it when I tried it.

“|_ (°_0) _|”

Sincerely,

George

http://www.vimeo.com/georgegoodman
http://www.linkedin.com/in/georgefranklingoodman

[Ivan Semchuk]

Here is the code with clear variables: still no luck!

S=65536;
x1=640;
x2=-3428578.8
t1=1;
t2=5;

if (time <= t1){
sx = x1;
}else if (time > t1 && time < t2){
t = time - t1;
T = t2 - t1;
kx = Math.log(x2/x1)/T;
sx = x1*Math.exp(kx*t);
}else{
sx = x2;
}
sx

[George Goodman]

Sorry, forgot I did a little other clean up. See if this does what you want.

layer = "17";
S=100/comp("MapLayers").layer(layer).scale[0]-1;
x1=640;
y1=360;
x2=x1+S*(comp("MapLayers").layer("1").position[0]-comp("MapLayers").layer("17").position[0]);
y2=y1+S*(comp("MapLayers").layer("1").position[1]-comp("MapLayers").layer("17").position[1]);
t1=1;
t2=5;

if (time == t1){
sx = x1;
sy = y1;
}else if (time > t1 && time == t2){
t = time - t1;
T = t2 - t1;
kx = Math.log(x2/x1)/T;
ky = Math.log(y2/y1)/T;
sx = x1*Math.exp(kx*t);
sy = y1*Math.exp(ky*t);
}else{
sx = x2;
sy = y2;
}
[sx,sy]

“|_ (°_0) _|”

Sincerely,

George

http://www.vimeo.com/georgegoodman
http://www.linkedin.com/in/georgefranklingoodman

[Ivan Semchuk]

Tried it, however “sx” shows -3428526.47427368.
And only in 1st second it show 640. Strange…
Did you try with a simple variables I sent earlier?

[George Goodman]

No sorry, don’t think I can be of help on this one. I think I jumped out of my league here.

Maybe upload a project file and give a little more detail of what you’re trying to do. Someone else may be able to jump in.

“|_ (°_0) _|”

Sincerely,

George

http://www.vimeo.com/georgegoodman
http://www.linkedin.com/in/georgefranklingoodman

[Ivan Semchuk]

Thank you anway! Still working on it.
I’m trying to match a scale of a map with its position.
So i have 17 layers. Scale works perfect. Y coorinates aswell. Just X coorinate fdoes not work.
So I have this code that can be just pasted into TEXT source to see that something is wrong.
The code doe not refering anything so the project file does not need to bee uploaded.

S=65536;
x1=640;
x2=-3428578.8
t1=1;
t2=5;

if (time <= t1){
sx = x1;
}else if (time > t1 && time < t2){
t = time - t1;
T = t2 - t1;
kx = Math.log(x2/x1)/T;
sx = x1*Math.exp(kx*t);
}else{
sx = x2;
}
sx