public void bottomOn(final Actor object) {
object.setLocation(getWidth() / 2 - object.getWidth() / 2, getHeight() - object.getHeight());
}
public void leftOn(final Actor object) {
object.setLocation(0, getHeight() / 2 - object.getHeight() / 2);
}
public void rightOn(final Actor object) {
object.setLocation(getWidth() - object.getWidth(), getHeight() / 2 - object.getHeight() / 2);
}
public void centerOn(final Actor object) {
object.setLocation(
getWidth() / 2 - object.getWidth() / 2, getHeight() / 2 - object.getHeight() / 2);
}