Determine drawn Rect from Canvas (Determine position of OverlayItem)

Question

I'm trying to just draw visible OverlayItems, thats why I determine the maps visible rect but I'm not able to determine the Rect where the Canvas will draw the OverlayItem.

Thats what I did till now (method in itemized overlay).. but the getClipBounds() doesn't return the correct Rect

@Override
    public void draw(Canvas canvas, MapView map, boolean shadow) {
        if (getMapBounds().intersect(canvas.getClipBounds())) {
            super.draw(canvas, map, false);
        }
    }

I don't want to draw other OverlayItems, i want to know if my canvas draw something within the visible rects of the map view Because if not i don't draw this canvas This is done to speed up the mapview that has nearly 2000 overlay items

Answer 1

I now did this by iterating over the items and checking wether they are on the map or not Just like this:

@Override
    public void draw(Canvas canvas, MapView map, boolean shadow) {
        for (int i = 0; i < mOverlays.size(); i++) {
            if (isLocationVisible(mOverlays.get(i).getPoint())) {
                super.draw(canvas, map, false);
            }
        }       
    }