[mapguide-users] Calculating map meters per unit without MgCoordinateSystem

[Jackie Ng]

Hi All,

I've been playing around with the Maestro 3.0 API backend trying to port
over the existing Runtime Map functionality. In particular, I've been trying
to see if I can use existing Rendering Service APIs with my
purely-client-side-created runtime map. The results were a bit strange:

A 1024 x 1024 map image request returns a 1024 x 1024 image but with only
several pixels actually rendered at the center of the image.

After some sleuthing around, it turns out my default meters-per-unit was way
off. Putting in the correct meters-per-unit value returns a fully-rendered
1024 x 1024 image. So here's the problem:

The meters-per-unit value is calculated by: 

MgCoordinateSystem.ConvertCoordinateSystemUnitsToMeters(1.0) (as seen in the
mapframe.aspx/php/jsp of the AJAX viewer)

Unfortunately, the code being purely client-side (and Maestro API being 100%
managed), I do not have access to the official MapGuide API and thus the
MgCoordinateSystem class.

So is there a purely managed way to calculate this value?

- Jackie
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