ILine Interface

Provides access to members that identify a straight line segment and defines its properties.

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 This method is obsolete.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.

ILine.Angle Property

The angle between this line and the positive x-axis.

Public ReadOnly Property Angle As Double

public double Angle {get;}

Remarks

The following Visual Basic example gets the angle of a line and converts it to degrees :

dAngleDegree = (180 * pLine.Angle) / Pi

Where Pi = 4 * Atn(1)

ILine.PutCoords Method

Sets this line's endpoints to be 'from' and 'to'.

Public Sub PutCoords ( _
    ByVal from As IPoint, _
    ByVal to As IPoint _
)

public void PutCoords (
    IPoint from,
    IPoint to
);

Description

The PutCoords method sets the From Point and To Point for a line object. If the From Point and To Point are identical, it creates a zero Length line with the same start and endpoint.

Remarks

ILine.QueryCoords Method

Copies the endpoints of this line to 'from' and 'to'.

Public Sub QueryCoords ( _
    ByVal from As IPoint, _
    ByVal to As IPoint _
)

public void QueryCoords (
    IPoint from,
    IPoint to
);

Description

Queries the From and To Points of the Line. These are the only parameters necessary to create a well-defined line.

Remarks

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.

Classes that implement ILine

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.

// 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);

     }