IGeometry4 Interface

Provides access to methods that indicate if a geometry has been changed (edited, projected, etc).

Members

	Name	Description
	Changed	Indicates if a geometry has been changed (edited, projected, etc).
	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 This method is obsolete.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.
	ProjectEx	Projects a geometry, optionally applies a GeoTransformation, and optionally densifies the geometry.
	QueryEnvelope	Copies this geometry's envelope properties into the specified envelope.
	QueryWKSEnvelope	Defines the specified wksenvelope to be the current extent of this geometry in the x-y plane.
	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.

IGeometry4.Changed Property

Indicates if a geometry has been changed (edited, projected, etc).

Public Property Changed As Boolean

public bool Changed {get; set;}

Description

The Changed method returns whether or not the geometry has been modified. If the geometry always stays in memory that method only returns 'false' immediately after its creation. However if the shape came from disk the Changed method will return 'false' until de geometry is modified in memory.

//This example demonstrates how to use the Changed method

    private void Changed_Example()

    {

        IEnvelope envelope = new EnvelopeClass();

        envelope.PutCoords(0, 0, 20, 20);

        ISegmentCollection segmentCollection = new PolygonClass();

        segmentCollection.SetRectangle(envelope);

        IGeometry4 geometry = segmentCollection as IGeometry4;

        System.Windows.Forms.MessageBox.Show("Just after creation : " + geometry.Changed);

        segmentCollection.SetRectangle(envelope);

        System.Windows.Forms.MessageBox.Show("Just after modification : " + geometry.Changed);

    }

Inherited Interfaces

Interfaces	Description
IGeometry3	Provides rapid access to a geometry's extent in the x-y plane.
IGeometry2	Provides access to members that extend the IGeometry interface with a more sophisticated projection method.
IGeometry	Provides access to members that describe properties and behavior of all geometric objects.

Classes that implement IGeometry4

Classes	Description
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.
MultiPatch	A collection of surface patches.
Multipoint	An ordered collection of points; optionally has measure, height and ID attributes.
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.