Pixel distance in Google Map (API V3) to avoid overlapping labels / overlays

Question

What is the best way to calculate the pixel distance between to coordinates (lat/lon) in a Google Map. I am not asking about the distance in km/miles (therefore I have a library), but pixels on the screen considering the current zoom factor.

Background: I want to draw overlays without overlapping them. So I need to calculate the offset for these positions. So in a lower zoom factor a distance of 500 km can mean the overlays do overlap, while at 50km they don't.

Of course, any other algorithm to avoid overlaps not based on the pixel distance would be appreciated.

-- Update --

Guess is is going in the direction of clustering, will check this:

-- Update --

Most likely I can use this here: http://code.google.com/apis/maps/documentation/javascript/reference.html

google.maps.MapCanvasProjection.fromLatLngToDivPixel

To get the projection I will use the answers here:

Absolutely, will do this as soon everything is settled, minor details missing. I try always to update questions when I find out something by myself in order not to waste somebody's else time. — Horst Walter, Aug 18 '11 at 09:44

score 9 · Accepted Answer · edited May 23 '17 at 10:29

First I found that what I am looking for is subject of the clustering libraries / examples:

The examples showed me a method google.maps.MapCanvasProjection.fromLatLngToDivPixel, which required a projection of the map. Eventually the following topics revealed how to get this projection:

Pixel distance in Google Map (API V3) to avoid overlapping labels / overlays

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