Dang. They fooled be by designing the GObliqueMercator() interface to 
only have one visible parameter. It turns out that it sort of has to do 
that in order to subclass GProjection(), but then it peeks around the 
side to read the second parameter.

So it turns out that you can simply write
   new GObliqueMercator(31,90)
as the projection for your maptype, and you don't actually need to add 
{header:90} to your GMapType() like the G_OBLIQUE_* maptypes do.

The first parameter of GObliqueMercator() is the number of zoom levels 
(remember to make it at least 31 if you're going to use polys) and the 
second parameter is the rotation which must be 0, 90, 180 or 270.

-- 
Mike Williams
http://econym.org.uk/gmap


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