Resize path!

Use action manager code to transform the path. It easy to get the documents width and height.  However the Path bounds is a different story.  You will most  likely need that to calculate the vales need to be used with transform.  You can create a selection for the path and get the bounds of that selection. You can get the control points in the path however a path cam be any shape and have many  points.  I would think its the path bounds you need to work from.

The X and y delta of the path center point move to the center of the canvas and the  width and height resize in percentage.

// =======================================================
transform(631, 202.5, 929.166667, 450.520833);
function transform(horizontal, vertical, width, height) {
var descriptor = new ActionDescriptor();
var descriptor2 = new ActionDescriptor();
var reference = new ActionReference();
reference.putEnumerated( stringIDToTypeID( "path" ), stringIDToTypeID( "ordinal" ), stringIDToTypeID( "targetEnum" ));
descriptor.putReference( charIDToTypeID( "null" ), reference );
descriptor.putEnumerated( stringIDToTypeID( "freeTransformCenterState" ), stringIDToTypeID( "quadCenterState" ), stringIDToTypeID( "QCSAverage" ));
descriptor2.putUnitDouble( stringIDToTypeID( "horizontal" ), stringIDToTypeID( "pixelsUnit" ), horizontal );
descriptor2.putUnitDouble( stringIDToTypeID( "vertical" ), stringIDToTypeID( "pixelsUnit" ), vertical );
descriptor.putObject( stringIDToTypeID( "offset" ), stringIDToTypeID( "offset" ), descriptor2 );
descriptor.putUnitDouble( stringIDToTypeID( "width" ), stringIDToTypeID( "percentUnit" ), width );
descriptor.putUnitDouble( stringIDToTypeID( "height" ), stringIDToTypeID( "percentUnit" ), height );
executeAction( stringIDToTypeID( "transform" ), descriptor, DialogModes.NO );
}

That action manager corde was for this transform