ICurve2 Interface

Provides access to members that extend the functionality of one dimensional curves.

Description

ICurve2 extends Segment functionality to allow both endpoints to be set simultaneously. This allows the segment parameterization to be maintained when relocating both the From Point and the To Point.

Members

	Name	Description
	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 This method is obsolete.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.
	PutCoordsEx	Sets this segment's endpoints 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.

ICurve2.PutCoordsEx Method

Sets this segment's endpoints to 'from' and 'to'.

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

public void PutCoordsEx (
    IPoint from,
    IPoint to
);

Description

PutCoordsEx allows both the fromPoint and the toPoint to be set simultaneously.A Conformal Transformation based on the original points and the new pointsis applied to the curve.

//This example demonstrates how to use the PutCoordsEx method

static void PutCoordsEx_Example()

{

    //Create a new CircularArc

    IPoint fromPoint = new PointClass();

    fromPoint.PutCoords(0, 0);

    IPoint centerPoint = new PointClass();

    centerPoint.PutCoords(5, 0);

    IPoint toPoint = new PointClass();

    toPoint.PutCoords(10, 0);

    ICircularArc circularArc = new CircularArcClass();

    circularArc.PutCoords(centerPoint, fromPoint, toPoint, esriArcOrientation.esriArcClockwise);

    ICurve2 curve = circularArc as ICurve2;

    //Create new points

    IPoint newFromPoint = new PointClass();

    newFromPoint.PutCoords(-5, 0);

    IPoint newToPoint = new PointClass();

    newToPoint.PutCoords(15, 10);

    //Use the new points to modify the end points

    //of the CircularArc. The method will perform a conformal

    //transformation on the curves to adjust the end points

    String report = "Curves before PutCoordsEx \n";

    report = report + printCircularArcProperties(curve as ICircularArc);

    curve.PutCoordsEx(newFromPoint, newToPoint);

    report = report + "Curves after PutCoordsEx \n";

    report = report + printCircularArcProperties(curve as ICircularArc);

    System.Windows.Forms.MessageBox.Show(report);

}

static String printCircularArcProperties(ICircularArc circularArc)

{

    String report = "Radius : " + circularArc.Radius + "\n" +

                    "Chord Height : " + circularArc.ChordHeight + "\n" +

                    "Central Angle (Rad) : " + circularArc.CentralAngle + "\n" +

                    "From Angle (Rad) : " + circularArc.FromAngle + "\n" +

                    "To Angle (Rad) : " + circularArc.ToAngle + "\n" +

                    "Center Point : " + circularArc.CenterPoint.X + " , " + circularArc.CenterPoint.Y;

    return report;

}

'This example demonstrates how to use the PutCoordsEx method

    Sub PutCoordsEx_Example()

        Dim pCarc As ICircularArc, pCurve As ICurve2

        Dim ptc As IPoint, pfr As IPoint, pto As IPoint

        Dim pNewFr As IPoint, pNewTo As IPoint

        'Create a new CircularArc

        pCarc = New CircularArc

        ptc = New Point

        ptc.PutCoords(5, 0)

        pfr = New Point

        pfr.PutCoords(0, 0)

        pto = New Point

        pto.PutCoords(10, 0)

        pCarc.PutCoords(ptc, pfr, pto, esriArcOrientation.esriArcClockwise)

        pCurve = pCarc 'QI

        'Create new points

        pNewFr = New Point

        pNewFr.PutCoords(-5, 0)

        pNewTo = New Point

        pNewTo.PutCoords(15, 10)

        'Use the new points to modify the end points

        'of the CircularArc. The method will perform a conformal

        'transformation on the curves to adjust the end points

        Debug.Print("*** Curves before PutCoordsEx ***")

        printCArcProp(pCurve)

        pCurve.PutCoordsEx(pNewFr, pNewTo)

        Debug.Print("*** Curves after PutCoordsEx ***")

        printCArcProp(pCurve)

    End Sub

    Sub printCArcProp(ByVal pCarc As ICircularArc)

        Debug.Print("Radius : " & pCarc.Radius)

        Debug.Print("Chord Height : " & pCarc.ChordHeight)

        Debug.Print("Central Angle (Rad) : " & pCarc.CentralAngle)

        Debug.Print("From Angle (Rad) : " & pCarc.FromAngle)

        Debug.Print("To Angle (Rad) : " & pCarc.ToAngle)

        Debug.Print("Center Point : " & pCarc.CenterPoint.X & " , " & pCarc.CenterPoint.Y)

    End Sub

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 ICurve2

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.
Line	A 2D straight line between a pair of 2D endpoints; can optionally have height, measure and ID attributes at each endpoint.
Polyline	An ordered collection of paths; optionally has measure, height and ID attributes.