こんな感じかな。
var doc = fl.getDocumentDOM();
for (var i in doc.selection) {
doc.selection[i].x = Math.round(doc.selection[i].x);
doc.selection[i].y = Math.round(doc.selection[i].y);
}
![Flash Math & Physics Design:ActionScript 3.0による数学・物理学表現[入門編]](http://ecx.images-amazon.com/images/I/617sNhK9P9L._SL160_.jpg)
