how can i parent a layer movement to a slider control?

[DanonDogg]

i want a layer to move from a specific point A to point B

and i want it to be controlled (parent) by a slider control, so when i key-frame the slide control to lets say 10 its at the end of the movement

and 0 is the begging of the movement

hope u understand

[Szalam · Accepted solution]

You would want to use a linear() expression. That should be enough to get you started in the right direction! Once you learn how to use it, it is very powerful. Have fun!

[DanonDogg]

thank u, it is really helpful

but i'm still stuck

i wrote

x=thisComp.layer("Layer 19").transform.position[1];

faceMove=linear(x,-207,-197,0,10);

faceMove

the 207 and 197 is the location range

and 0-10 is my slider range

but the problem is that only when i changing the location values the slider values changes

but when i try to change the slide values, the software wont let me

[Szalam]

What did you apply that expression to?

[DanonDogg]

null object with a slider control

[Szalam]

Okay. That's not how to do it. The expression needs to be applied to the value that you want to change.

Here is an example project: Linear to drive position with slider

(I don't know what version you are using, so I saved it back to version 12 of AE. If you need me to save it back to CS6, let me know.)

[Szalam]

In the expression, I pointed the x value to be its own regular value (that's the value[0] part) and then the y is set to be the linear result. X and Y are an array, so they have to be displayed as [x,y]. Thus the value in x and the expression variable in y.

[DanonDogg]

man, thank u so much! im still not controlling the expression 100 percent but i did succeed to do the thing i tried with your code, and i will work on it and learn it well. thanks!!!