[fdo-users] Using CircularArc in NEN1878 provider

[Gavin Cramer]

Hello, Piet.

Arcs can only appear as curve segments.  They do not actually derive
from FdoIGeometry.  To get an FdoIGeometry from an arc, add the
FdoICircularArcSegment to an FdoCurveSegmentCollection and then create a
FdoICurveString.  FdoICurveString is derived from FdoIGeometry.  The
unit tests have some examples of this, e.g. see CreateCurveString() in
GeometryTest.cpp.

If you are trying to involve the arc in a polygon rather than a curve,
you can use the FdoCurveSegmentCollection to create an FdoIRing instead.
One or more FdoIRing values can be use to create an FdoICurvePolygon.

Gavin



-----Original Message-----
From: fdo-users-bounces at lists.osgeo.org
[mailto:fdo-users-bounces at lists.osgeo.org] On Behalf Of Piet Bibber
Sent: Monday, October 01, 2007 7:37 AM
To: fdo-users at lists.osgeo.org
Subject: [fdo-users] Using CircularArc in NEN1878 provider


Hey,

The NEN1878 provides info as a CircularArc. I'm capabale of creating a
FdoICircularArcSegment, but have difficulties returning the IGeometry*
for
it (or the FdoByteArray*).

Question: How do I convert a FdoICircularArcSegment into a FdoIGeometry*
or
FdoByteArray*? (for usage in the readers GetGeometry function)

Note: Turning the FdoICircularArcSegment into Geometry via Envelope
doesn't
seem to work; or returning the 3 points as part of a CurveString. (But I
might be overlooking something)

Thanks in advance
Piet
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