if( hot_point >= 0 && sz > 0 ) {
CriKeyPoint *pt = points[hot_point];
point_list->set_point(hot_point, PT_X, pt->x = output_x);
if( hot_point >= 0 && sz > 0 ) {
CriKeyPoint *pt = points[hot_point];
point_list->set_point(hot_point, PT_X, pt->x = output_x);