[mapguide-users] Maestro API 5 - GetLegendImage fails

[Jackie Ng]

Maestro's previews are off of a session-based copy of the Layer Definition,
but the idea is still the same.

The scale you specify must match a given VectorScaleRange in the Layer
Definition (the scale you specify lies between the min/max scales of the
VectorScaleRange)
    The VectorScaleRange must have a [Point/Line/Area/Composite]TypeStyle of
the given type
         The [Point/Line/Area/Composite]Rule must exist at the specified
zero-based theme index
              The preview is generated off of this particular rule.

If that root condition isn't satisified, that's where a NULL MgByteReader
seems to be returned based on my glance at the server code.

- Jackie



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