Class CubicBezierCurve

Creates a curved geometry by replacing the segments of the input with Cubic Bezier Curves.

Inheritance

object

CubicBezierCurve

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: NetTopologySuite.Shape

Assembly: NetTopologySuite.dll

Syntax

public class CubicBezierCurve

Remarks

The Bezier control points are determined from the segments of the geometry and the alpha control parameter controlling curvedness, and the optional skew parameter controlling the shape of the curve at vertices. The Bezier Curves are created to be C2-continuous (smooth) at each input vertex.

Alternatively, the Bezier control points can be supplied explicitly.

The result is not guaranteed to be valid, since large alpha values may cause self-intersections.

Methods

Create(Geometry, Geometry)

Creates a geometry of linearized Cubic Bezier Curves defined by the segments of the input and a list (or lists) of control points.

Declaration

public static Geometry Create(Geometry geom, Geometry controlPoints)

Parameters

Type	Name	Description
Geometry	geom	The geometry defining the curve
Geometry	controlPoints	A geometry containing the control point elements.

Returns

Type	Description
Geometry	The linearized curved geometry

Remarks

Typically the control point geometry is a LineString or MultiLineString containing an element for each line or ring in the input geometry. The list of control points for each linear element must contain two vertices for each segment (and thus

2 * npts - 2

).

Create(Geometry, double)

Creates a geometry of linearized Cubic Bezier Curves defined by the segments of the input and a parameter controlling how curved the result should be.

Declaration

public static Geometry Create(Geometry geom, double alpha)

Parameters

Type	Name	Description
Geometry	geom	The geometry defining the curve
double	alpha	A curvedness parameter (0 is linear, 1 is round, >1 is increasingly curved)

Returns

Type	Description
Geometry	The linearized curved geometry

Create(Geometry, double, double)

Creates a geometry of linearized Cubic Bezier Curves defined by the segments of the inputand a parameter controlling how curved the result should be, with a skew factor affecting the curve shape at each vertex.

Declaration

public static Geometry Create(Geometry geom, double alpha, double skew)

Parameters

Type	Name	Description
Geometry	geom	The geometry defining the curve
double	alpha	The curvedness parameter (0 is linear, 1 is round, >1 is increasingly curved)
double	skew	The skew parameter (0 is none, positive skews towards longer side, negative towards shorter

Returns

Type	Description
Geometry	The linearized curved geometry

GetResult()

Gets the computed Bezier curve geometry

Declaration

public Geometry GetResult()

Returns

Type	Description
Geometry	The curved geometry