I am creating a custom map with linear projection and I would like
GScaleControl to work with it.  The sample code is available at
http://evonymap.com .  The GScaleControl does not determine scales in
any rational fashion from my GProjection implementation, but it works
fine if my instance was replaced with a GMercatorProjection, which the
map doesn't use.  Does anyone have an idea what specifically ties up
the GScaleControl to GMercatorProjection to make it work?

I was following up on an old thread at
http://groups.google.ca/group/Google-Maps-API/browse_thread/thread/d75fc4e46659b4e7/76d66453184f1e0f?lnk=gst&q=gscalecontrol#76d66453184f1e0f
and was hoping there is a solution by now.

A more specific question is which coordinates does GScaleControl use
with GLatLng.distanceFrom(a) to figure out the scale?  What "a" and
"this" are being used?  I doubt it will help, but it's worth a try.  I
think this control is very useful.

Thank you.
- Novi

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