How to create an annotation with respect to zoom?

Hi,

Does anyone know how to create an annotation withrespect to the zoom of the pageview?

I already tried this:

ASFixed zoom = AVPageViewGetZoom(pageView);

rect->top += ANNOT_HEIGHT;

rect->top *= zoom;

rect->bottom = rect->top - ANNOT_HEIGHT;

rect->bottom *= zoom;

rect->right += ANNOT_WIDTH;

rect->right *= zoom;

rect->left = rect->right - ANNOT_WIDTH;

rect->left *= zoom;

This does not work correctly and the annotation is not drawn at all.