ArcObjects Library Reference (Geometry)

IGeometry Interface

Provides access to members that describe properties and behavior of all geometric objects. Note: the IGeometry interface has been superseded byIGeometry5. Please consider using the more recent version.

Product Availability

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

Description

Common properties and methods shared by all geometric objects. Geometries are objects that define a spatial location and an associated geometric shape.

Members

		Description
	Dimension	The topological dimension of this geometry.
	Envelope	Creates a copy of this geometry's envelope and returns it.
	GeometryType	The type of this geometry.
	GeoNormalize	Shifts longitudes, if need be, into a continuous range of 360 degrees.
	GeoNormalizeFromLongitude	Normalizes longitudes into a continuous range containing the longitude. This method is obsolete.
	IsEmpty	Indicates whether this geometry contains any points.
	Project	Projects this geometry into a new spatial reference.
	QueryEnvelope	Copies this geometry's envelope properties into the specified envelope.
	SetEmpty	Removes all points from this geometry.
	SnapToSpatialReference	Moves points of this geometry so that they can be represented in the precision of the geometry's associated spatial reference system.
	SpatialReference	The spatial reference associated with this geometry.

CoClasses that implement IGeometry

CoClasses and Classes	Description
BezierCurve	A cubic Bezier curve defined between two points; optionally has measure, height and ID attributes at each endpoint.
CircularArc	A portion of a circle that connects two points optionally has measure, height and ID attributes at each endpoint.
EllipticArc	A portion of the boundary of a 2D ellipse that connects two points; optionally has measure, height and ID attributes at each endpoint.
Envelope	A rectangle with sides parallel to a coordinate system defining the extent of another geometry; optionally has min and max measure, height and ID attributes.
GeometryBag	An ordered collection of objects that support the IGeometry interface.
Line	A 2D straight line between a pair of 2D endpoints; can optionally have height, measure and ID attributes at each endpoint.
MultiPatch	A collection of surface patches.
Multipoint	An ordered collection of points; optionally has measure, height and ID attributes.
Path	A sequence of connected segments.
Point	A two dimensional point, optionally with measure, height, and ID attributes.
Polygon	A collection of rings ordered by their containment relationship; optionally has measure, height and ID attributes.
Polyline	An ordered collection of paths; optionally has measure, height and ID attributes.
Ray	A 3D ray that begins at a point and extends infinitely along a line in one direction only.
Ring	An area bounded by one, closed sequence of connected segments; optionally has measure, height and ID attributes at each vertex.
Sphere	A complete sphere.
TriangleFan	A continuous 3D fan of triangles, where each triangle after the first shares an edge with the preceding triangle, and all triangles share a common pivot point.
Triangles	A collection of 3D triangles, where each consecutive triplet of vertices defines a new triangle
TriangleStrip	A continuous 3D strip of triangles, where each triangle after the first shares an edge with the preceding triangle.

Remarks

Every Geometry created within ArcGIS should be assigned a spatial reference. Always attach well-defined spatial references to new geometries. This improves processing efficiency, in particular, when using ITopologicalOperator on geometries that contain curved segments (circular arcs, bezier curves, elliptical arcs). New geometries include any geometry that is created in memory. It does not matter whether it will be stored in a feature class or not. Well-defined as applied to a spatial reference means that it not only has its coordinate system (projection) defined, but also its coordinate grid. The coordinate grid consists of the xy domain, xy resolution, and xy cluster tolerance properties of a spatial reference. If the Geometry includes z or m values, the z or m domains, z or m resolutions, and z or m cluster tolerance properties must also be defined. The cluster tolerance and resolutions can be quickly and easily set using SetDefault methods on ISpatialReferenceResolution and ISpatialReferenceTolerance interfaces.

.NET Snippets

.NET Samples

Convert part to feature command (Code Files: ConvertPart) | 3D multipatch examples (Code Files: CompositeExamples DrawUtilities ElementUtilities ExtrusionExamples GeometryUtilities GraphicsLayer3DUtilities MultiPatchExamples RingExamples RingGroupExamples Transform3DExamples TriangleFanExamples TrianglesExamples TriangleStripExamples Vector3DExamples) | Cut polygons without selection edit task (Code Files: CutPolygonsWithoutSelectionEditTask) | Editing using a custom form (Code Files: EditorForm) | Custom reshape polyline edit task (Code Files: ReshapePolylineEditTask) | Implementing a schematic layout algorithm and its layout property page (Code Files: TranslateTree) | Custom map selection commands (Code Files: SelectFeatures) | Custom UI elements using add-ins (Code Files: AddGraphicsTool) | Create a custom raster type from the ground up for DMCII data (Code Files: DMCIIRasterType) | Implementing a schematic digitizing tool (Code Files: DigitTool) | Brushing to create a selection (Code Files: BrushingVB) | Custom vertex editing commands (Code Files: CustomVertexCommands) | Calculate area geoprocessing function tool (Code Files: CalculateAreaFunction) | Move a graphic along a path in ArcMap (Code Files: AnimationUtils cmdMoveGraphicAlongPath frmCreateGraphicTrackOptions MapGraphicKeyframe) | ArcGIS Network Analyst extension barrier location editor (Code Files: EditorForm) | Create custom move, rotate, and scale GeometricEffects within a single project (Code Files: clsGE_Transform_Move clsGE_Transform_Rotate clsGE_Transform_Scale) | Bind a geodatabase table to a .NET control (Code Files: FieldPropertyDescriptor) | Creating a toolbar of globe tools (Code Files: PointElement PointGeometry PolygonElement PolygonGeometry PolylineElement PolylineGeometry StyleElement TextElement) | Buffer snap agent (Code Files: BufferSnap) | Subset network evaluators (Code Files: AutoUpdateNetworkElementArrayParametersCommand SubsetHelperUI) | StreetMap routing (Code Files: RoutingForm) | RSS weather layer (Code Files: RSSWeatherLayerClass) | Create a custom tool (Code Files: DrawGraphicLine) | Create camera flyby from path (Code Files: frmCameraPath) | RubberBand zoom (Code Files: RubberBandZoom) | Create a custom marker placement for placing markers around a point (Code Files: AroundPoint) | Reducing schematic nodes and computing a cumulative attribute via a schematic rule (Code Files: NodeReductionRule)

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