Class BufferInputLineSimplifier

Simplifies a buffer input line to remove concavities with shallow depth.

Inheritance

object

BufferInputLineSimplifier

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 BufferInputLineSimplifier

Remarks

The major benefit of doing this is to reduce the number of points and the complexity of shape which will be buffered. This improves performance and robustness. It also reduces the risk of gores created by the quantized fillet arcs (although this issue should be eliminated by the offset curve generation logic).

A key aspect of the simplification is that it affects inside (concave or inward) corners only. Convex (outward) corners are preserved, since they are required to ensure that the generated buffer curve lies at the correct distance from the input geometry.

Another important heuristic used is that the end segments of linear inputs are never simplified. This ensures that the client buffer code is able to generate end caps faithfully. Ring inputs can have end segments removed by simplification.

No attempt is made to avoid self-intersections in the output. This is acceptable for use for generating a buffer offset curve, since the buffer algorithm is insensitive to invalid polygonal geometry. However, this means that this algorithm cannot be used as a general-purpose polygon simplification technique.

Constructors

BufferInputLineSimplifier(Coordinate[])

Declaration

public BufferInputLineSimplifier(Coordinate[] inputLine)

Parameters

Type	Name	Description
Coordinate[]	inputLine

Methods

Simplify(Coordinate[], double)

Simplify the input coordinate list. If the distance tolerance is positive, concavities on the LEFT side of the line are simplified. If the supplied distance tolerance is negative, concavities on the RIGHT side of the line are simplified.

Declaration

public static Coordinate[] Simplify(Coordinate[] inputLine, double distanceTol)

Parameters

Type	Name	Description
Coordinate[]	inputLine	The coordinate list to simplify
double	distanceTol	simplification distance tolerance to use

Returns

Type	Description
Coordinate[]	The simplified coordinate list

Simplify(double)

Simplify the input coordinate list.

Declaration

public Coordinate[] Simplify(double distanceTol)

Parameters

Type	Name	Description
double	distanceTol	Simplification distance tolerance to use

Returns

Type	Description
Coordinate[]	The simplified coordinates list

Remarks

If the distance tolerance is positive, concavities on the LEFT side of the line are simplified. If the supplied distance tolerance is negative, concavities on the RIGHT side of the line are simplified.