ArcObjects Library Reference (Geometry)

ILine Interface

Provides access to members that identify a straight line segment and defines its properties. Note: the ILine interface has been superseded byILine2. Please consider using the more recent version.

Product Availability

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

Members

	Name	Description
	Angle	The angle between this line and the positive x-axis.
	Dimension	The topological dimension of this geometry.
	Envelope	Creates a copy of this geometry's envelope and returns it.
	FromPoint	The 'from' point of the curve.
	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 This method is obsolete.
	GetSubcurve	Extracts a portion of this curve into a new curve.
	IsClosed	Indicates if 'from' and 'to' points (of each part) are identical.
	IsEmpty	Indicates whether this geometry contains any points.
	Length	The length of the curve.
	Project	Projects this geometry into a new spatial reference.
	PutCoords	Sets this line's endpoints to be 'from' and 'to'.
	QueryCoords	Copies the endpoints of this line to 'from' and 'to'.
	QueryEnvelope	Copies this geometry's envelope properties into the specified envelope.
	QueryFromPoint	Copies this curve's 'from' point to the input point.
	QueryNormal	Constructs a line normal to a curve from a point at a specified distance along the curve.
	QueryPoint	Copies to outPoint the properties of a point on the curve at a specified distance from the beginning of the curve.
	QueryPointAndDistance	Finds the point on the curve closest to inPoint, then copies that point to outPoint; optionally calculates related items.
	QueryTangent	Constructs a line tangent to a curve from a point at a specified distance along the curve.
	QueryToPoint	Copies the curve's 'to' point into the input point.
	ReverseOrientation	Reverses the parameterization of the curve ('from' point becomes 'to' point, first segment becomes last segment, etc).
	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.
	ToPoint	The 'to' point of the curve.

Inherited Interfaces

Interfaces	Description
ICurve	Provides access to properties and methods of all 1 dimensional curves (polylines, segments, boundaries of polygons, etc.).
IGeometry	Provides access to members that describe properties and behavior of all geometric objects.

CoClasses that implement ILine

CoClasses and Classes	Description
Line	A 2D straight line between a pair of 2D endpoints; can optionally have height, measure and ID attributes at each endpoint.

Remarks

The PutCoords method requires 2 Point objects to construct the line segment.

Line Example

[C#]

    // This example creates a simple line and gets the angle
    // and the start and endpoint.
    public void ShowLineAngle()
    {
        IPoint fromPoint=new PointClass();
        fromPoint.PutCoords(100, 100);

IPoint toPoint=new PointClass();
toPoint.PutCoords(150, 150);

        ILine line=new LineClass();
        line.PutCoords(fromPoint, toPoint);
        double angle=line.Angle;

        //query Coordinats
        IPoint outFromPoint=new PointClass();
        IPoint outToPoint=new PointClass();
        line.QueryCoords(outFromPoint, outToPoint);

        System.Windows.Forms.MessageBox.Show("From X=" + outFromPoint.X +
                                             ", From Y=" + outFromPoint.Y + "\n" +
                                             "To X=" + outToPoint.X +
                                             ", To Y=" + outToPoint.Y + "\n" +
                                             "Angle=" + angle);
    }

.NET Samples

3D multipatch examples (Code Files: ExtrusionExamples) | Triangle graphic element (Code Files: TriangleElementClass) | Custom feedback tool and font drop-down list tool control (Code Files: ToolSample)

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