[mapguide][MG419][New] Calling MgRing->GetArea generates assertion

[Walt Welton-Lair]

You can view the artifact detail at the following URL:

    https://mapguide.osgeo.org/servlets/Scarab/id/MG419

Type
 Defect

Artifact ID
 MG419 (Calling MgRing->GetArea generates assertion)

Reported by
 Walt Welton-Lair
 waltweltonlair (walt.welton-lair at autodesk.com)

New artifact details:
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- Version set to new value
  1.0.1
- Subcomponent set to new value
  Core
- Target milestone set to new value
  1.1.0
- Platform set to new value
  All
- Artifact Status set to new value
  New
- Artifact created
- Summary set to new value
  Calling MgRing->GetArea generates assertion
- Steps to Reproduce set to new value
  Create an MgLinearRing and call GetArea on it.

- Description set to new value
  GetArea is published API, and it doesn't work correctly for linear and curve rings.

- Operating system set to new value
  All
- Defect Severity set to new value
  High
- Developer Notes set to new value
  The problem is that the strings returned by MgLinearRing::ToAWkt and MgCurveRing::ToAwkt are not valid in the context of GEOS, which is what's used to compute the area.  Linear ring, for example, is missing "LINEARRING" at the beginning of the string.

Fixing this is not as simple as updating the two ToAWkt methods.  That's because these are called from other methods which expect them to work as they do now.  For example, MgPolygon::ToAwkt calls ToAwkt on its outer ring and (via MgLinearRingCollection) on its inner rings.

Since GEOS expects a WKT string, maybe we should add a new MgGeometricEntity::ToWkt method...
- Priority set to new value
  P2

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