ArcObjects Library Reference  (GeoDatabase)    

GeometryDef CoClass

ESRI Geometry Definition object.

Product Availability

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.

Supported Platforms

Windows, Solaris, Linux

Interfaces

Interfaces Description
IClone (esriSystem) Provides access to members that control cloning of objects.
IGeometryDef Provides access to members that return information about the geometry definition.
IGeometryDefEdit Provides access to members that modify the geometry definition.
IPersist Defines the single method GetClassID, which is designed to supply the CLSID of an object that can be stored persistently in the system. IPersist is the base interface for three other interfaces: IPersistStorage, IPersistStream, and IPersistFile.
IPersistStream (esriSystem)
IXMLSerialize (esriSystem) Provides access to members that XML serialize and deserialize an object to/from XML.

Remarks

The GeometryDef object defines the spatial qualities of a feature class. The most fundmental spatial quality is the Geometry type, for example, point, line, and polygon. Other information necessary to define the feature class includes the spatial referencing system, whether the vertices have height or measure data, and, for geodatabases, the spatial index parameters.

The GeometryDef can be accessed from a shape field, that is a field of type esriFieldTypeGeometry. The actual geometry type is defined by the esriGeometryType enumeration, though currently only four values are acceptable with respect to GeometryDef objects: esriGeometryPoint, esriGeometryMultipoint, esriGeometryPolyline, and esriGeometryPolygon.

Beware of the confusion between the esriGeometryType enumeration and the similarly named esriFeatureType and esriShapeType. The following table shows the different roles of those enumerations.

ArcObjects Enumeration Values Interfaces that use the enumeration
esriGeometryType

Type of geometry in a geodatabase. Those in bold are valid for feature classes, others are component geometry objects.
esriGeometryPoint
esriGeometryMultipoint
esriGeometryPolygon
esriGeometryPolyline
esriGeometryLine

esriGeometryCircularArc
esriGeometryEllipticArc
esriGeometryBezier3Curve
esriGeometryPath
esriGeometryNull
esriGeometryRing
esriGeometryEnvelope
esriGeometryAny
esriGeometryBag
esriGeometryMultiPatch
esriGeometryTriangleStrip
esriGeometryTriangleFan
esriGeometryRay
esriGeometrySphere
esriGeometryTriangles
IFeatureClass::ShapeType
IGeometry::GeometryType
IGeometryDef::GeometryType

also
IGeometryDefEdit,
IGeometryFactory,
IEditSketchExtension,
IGridConversionOp,
IDimensionConstructor
esriFeatureType

Feature types defined by
feature class extensions
esriFTSimple
esriFTSimpleJunction
esriFTSimpleEdge
esriFTComplexJunction
esriFTComplexEdge
esriFTAnnotation
esriFTCoverageAnnotation
esriFTDimension
esriFTRasterCatalogItem
IFeature::FeatureType
IFeatureClass::FeatureType
IFeatureClassDescription::FeatureType
IFeatureWorkspace::CreateFeatureClass
IFeatureDataset::CreateFeatureClass

also, IGeometricNetwork and
INetworkLoader
esriShapeType

Type of geometry in a
shapefile
See the help for esriShapeType
for a full list
IFeature::FeatureType
IFeatureClass::FeatureType
IFeatureClassDescription::FeatureType
IFeatureWorkspace::CreateFeatureClass
IFeatureDataset::CreateFeatureClass

also, IGeometricNetwork and
INetworkLoader

See Also

IField Interface