AT_ERRCOUNT ART_mark_rotate (
        HIGEAR hIGear, 
        ART_MARK_INDEX hMarkIndex, 
        DOUBLE dblRotate
);

HIGEAR               hIGear;       /* HIGEAR handle of image  */
AT_ERRCOUNT          nErrcount;     /* tally of IG errors on  */
/* stack    */
ART_MARK_INDEX       hMarkIndex;    /* index to current mark  */
ART_MARK_ATTRIBUTES ma;    /* structures for  */
/* attributes of current  */
/* mark  */
nErrcount = ART_mark_query(hIGear, hMarkIndex, &ma);
if ((ma.dwType == ART_MARK_IMAGE_EMBEDDED) || 
   (ma.dwType == ART_MARK_IMAGE_REFERENCE))
{               /* if mark is an embedded image or image reference*/
                nErrcount = ART_mark_rotate(hIGear, hMarkIndex, 45.0);
}