Provides access to members that modify the geometry definition.
Product Availability
Members
| Description | ||
|---|---|---|
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AvgNumPoints | The estimated average number of points per feature. |
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AvgNumPoints | The estimated average number of points per feature. |
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GeometryType | The enumerated geometry type. |
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GeometryType | The geometry type. |
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GridCount | The number of spatial index grids. |
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GridCount | The number of spatial index grids. |
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GridSize | The size of a spatial index grid. |
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GridSize | The size of a spatial index grid. |
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HasM | Indicates if the feature class has measure (M) values. |
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HasM | Indicates if the feature class will support M values. |
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HasZ | Indicates if the feature class will support Z values. |
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HasZ | Indicates if the featureClass has Z values. |
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SpatialReference | The spatial reference for the dataset. |
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SpatialReference | The spatial reference of the dataset. |
Inherited Interfaces
| Interfaces | Description |
|---|---|
| IGeometryDef | Provides access to members that return information about the geometry definition. |
CoClasses that implement IGeometryDefEdit
| CoClasses and Classes | Description |
|---|---|
| GeometryDef | ESRI Geometry Definition object. |
Remarks
The IGeometryDefEdit interface is used when creating a GeometryDef object. You would normally use this interface when defining a new feature class. You cannot use IGeometryDefEdit to modify an existing GeometryDef which is attached to a feature class; the same restrictions apply when using the standard ArcGIS user interface. For example, you cannot change the spatial reference of an existing feature class.
The following are valid Geometry types for a new feature class (from esriGeometryType):
esriGeometryPoint
esriGeometryMultipoint
esriGeometryPolyline
esriGeometryPolygon
esriGeometryMultiPatch
The SpatialReference property should always be set when creating a new GeometryDef. If a GeometryDef without a spatial reference is used to create a stand-alone feature class, an error will occur.
If a feature class is created in a feature dataset, and the SpatialReference property does not match the spatial reference of the feature dataset, the property will be modified to match that of the feature dataset.
The code below shows how to create a geometry field, assuming a spatial reference has already been created:
// Create the GeometryDef and set its spatial reference and geometry type.
IGeometryDef geometryDef = new GeometryDefClass();
IGeometryDefEdit geometryDefEdit = (IGeometryDefEdit)geometryDef;
geometryDefEdit.SpatialReference_2 = spatialReference;
geometryDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPolyline;
// Set the grid count to 1 and the grid size to 0 to allow ArcGIS to
// determine a valid grid size.
geometryDefEdit.GridCount_2 = 1;
geometryDefEdit.set_GridSize(0, 0);
// Create a geometry field and assign the GeometryDef to it.
IField field = new FieldClass();
IFieldEdit fieldEdit = (IFieldEdit)field;
fieldEdit.Name_2 = "SHAPE";
fieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry;
fieldEdit.GeometryDef_2 = geometryDef;
The code below shows how to create a geometry field, assuming a spatial reference has already been created:
' Create the GeometryDef and set its spatial reference and geometry type.
Dim geometryDef As IGeometryDef = New GeometryDefClass()
Dim geometryDefEdit As IGeometryDefEdit = CType(geometryDef, IGeometryDefEdit)
geometryDefEdit.SpatialReference_2 = spatialReference
geometryDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPolyline
' Set the grid count to 1 and the grid size to 0 to allow ArcGIS to
' determine a valid grid size.
geometryDefEdit.GridCount_2 = 1
geometryDefEdit.GridSize_2(0) = 0
' Create a geometry field and assign the GeometryDef to it.
Dim field As IField = New FieldClass()
Dim fieldEdit As IFieldEdit = CType(field, IFieldEdit)
fieldEdit.Name_2 = "SHAPE"
fieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry
fieldEdit.GeometryDef_2 = geometryDef