Question

How do I go about changing an icon height & width based on the Google Maps zoom level?

I’m using Google Maps api v3.

Answer 1

You should be able to add a listener on the zoom change per the docs. It doesnt get passed anything, but you can get the property via the api.

google.maps.event.addListener(map, 'zoom_changed', function() {
    zoomLevel = map.getZoom();
    //this is where you will do your icon height and width change.     
  });