Class OffsetCurveBuilder

Computes the raw offset curve for a single Geometry component (ring, line or point). A raw offset curve line is not noded - it may contain self-intersections (and usually will).g The final buffer polygon is computed by forming a topological graph of all the noded raw curves and tracing outside contours. The points in the raw curve are rounded to a given PrecisionModel.

Note: this may not produce correct results if the input contains repeated or invalid points. Repeated points should be removed before calling. RemoveRepeatedOrInvalidPoints(Coordinate[]).

Inheritance

object

OffsetCurveBuilder

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: NetTopologySuite.Operation.Buffer

Assembly: NetTopologySuite.dll

Syntax

public class OffsetCurveBuilder

Constructors

OffsetCurveBuilder(PrecisionModel, ElevationModel, BufferParameters)

Declaration

public OffsetCurveBuilder(PrecisionModel precisionModel, ElevationModel em, BufferParameters bufParams)

Parameters

Type	Name	Description
PrecisionModel	precisionModel
ElevationModel	em
BufferParameters	bufParams

OffsetCurveBuilder(PrecisionModel, BufferParameters)

Declaration

public OffsetCurveBuilder(PrecisionModel precisionModel, BufferParameters bufParams)

Parameters

Type	Name	Description
PrecisionModel	precisionModel
BufferParameters	bufParams

Properties

BufferParameters

Gets the buffer parameters being used to generate the curve.

Declaration

public BufferParameters BufferParameters { get; }

Property Value

Type	Description
BufferParameters

Methods

GetLineCurve(Coordinate[], double)

This method handles single points as well as LineStrings. LineStrings are assumed not to be closed (the function will not fail for closed lines, but will generate superfluous line caps).

Declaration

public Coordinate[] GetLineCurve(Coordinate[] inputPts, double distance)

Parameters

Type	Name	Description
Coordinate[]	inputPts	The vertices of the line to offset
double	distance	The offset distance

Returns

Type	Description
Coordinate[]	A Coordinate array representing the curve or null if the curve is empty

GetOffsetCurve(Coordinate[], double)

Declaration

public Coordinate[] GetOffsetCurve(Coordinate[] inputPts, double distance)

Parameters

Type	Name	Description
Coordinate[]	inputPts
double	distance

Returns

Type	Description
Coordinate[]

GetRingCurve(Coordinate[], Position, double)

This method handles the degenerate cases of single points and lines, as well as rings.

Declaration

public Coordinate[] GetRingCurve(Coordinate[] inputPts, Position side, double distance)

Parameters

Type	Name	Description
Coordinate[]	inputPts
Position	side
double	distance

Returns

Type	Description
Coordinate[]	A Coordinate array representing the curve or null if the curve is empty

GetRingCurve(Coordinate[], Positions, double)

This method handles the degenerate cases of single points and lines, as well as rings.

Declaration

[Obsolete("Use GetRingCurve(Coordinate[], Geometries.Position, double)")]
public Coordinate[] GetRingCurve(Coordinate[] inputPts, Positions side, double distance)

Parameters

Type	Name	Description
Coordinate[]	inputPts
Positions	side
double	distance

Returns

Type	Description
Coordinate[]	A Coordinate array representing the curve or null if the curve is empty

IsLineOffsetEmpty(double)

Tests whether the offset curve for line or point geometries at the given offset distance is empty (does not exist). This is the case if:

• the distance is zero
• the distance is negative, except for the case of singled-sided buffers

Declaration

public bool IsLineOffsetEmpty(double distance)

Parameters

Type	Name	Description
double	distance	The offset curve distance

Returns

Type	Description
bool	true if the offset curve is empty