Resize Composition to Layers Scale

[fabianmoronzirfas]

Hi AEScripters,

could someone tell me why my script doesen't center all my layers?

(I'm trying to build a tiny crop tool)

thnx a lot

:F

Here is my code:

// written by fabiantheblind

// http://www.the-moron.net

function fitCompToLayer()

{

app.beginUndoGroup("fit Comp To Layer");

var activeComp = app.project.activeItem;
var selection = app.project.activeItem.selectedLayers[0];

var myScale = selection.scale.valueAtTime(0.0,false);
var myScaleW = myScale[0];
var myScaleH = myScale[1];

activeComp.width  = Math.floor((activeComp.width/100)*myScaleW);
activeComp.height = Math.floor((activeComp.height/100)*myScaleH);

// this doesn't work. but why?
var newWidth = app.project.activeItem.width;
var newHeight = app.project.activeItem.height;

var myLayers = activeComp.layers;
for(var i = 1; i< myLayers.length;i++){
myLayers.position[0] =   newWidth / 2;
     myLayers.position[1] =   newHeight / 2;
    }

app.endUndoGroup();
}

fitCompToLayer();

[Dan Ebberts · Accepted solution]

To change the position, you need to use setValue(), like this:

var newWidth = app.project.activeItem.width;
var newHeight = app.project.activeItem.height;

for(var i = 1; i<= activeComp.numLayers;i++){
  activeComp.layer(i).position.setValue([newWidth / 2, newHeight / 2]);
}

Dan

[fabianmoronzirfas]

Yeeeeessss.

Thanx Dan.

[fabianmoronzirfas]

haha. Or you make this the easy way like this:

To crop the composition to the region of interest, choose Composition > Crop Comp To Region Of Interest.

http://help.adobe.com/en_US/aftereffects/cs/using/WS3878526689cb91655866c1103906c6dea-7f05a.html