I assumed this could be solved with a simple command, such as in ActionScript, where you can write "scaleX= -1", but after peeking through the docs, I couldn't find any "scale" properties on the objects.
I found the answer in the matrix object (found on page 99 of the CS5 Javascript scripting reference)
For convenience, here's an example code to flip every object in your document along the 'y' axis: (reflect x)
if ( app.documents.length > 0 ) { // here's the "flip horizontal" magic: var totalMatrix = app.getScaleMatrix(-100,100); // apply the transformation to all art in the document var doc = app.activeDocument; for ( i = 0; i < doc.pageItems.length; i++ ) { doc.pageItems[i].transform( totalMatrix ); } }
cheers,
-J