Class BufferInputLineSimplifier

Namespace

NetTopologySuite.Operation.Buffer

Assembly

NetTopologySuite.dll

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

public class BufferInputLineSimplifier

Inheritance

object

BufferInputLineSimplifier

Inherited Members

object.GetType()

object.MemberwiseClone()

object.ToString()

object.Equals(object)

object.Equals(object, object)

object.ReferenceEquals(object, object)

object.GetHashCode()

Remarks

The most important benefit of doing this is to reduce the number of points and the complexity of shape which will be buffered. It also reduces the risk of gores created by the quantized fillet arcs (although this issue should be eliminated in any case 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 the input are never simplified. This ensures that the client buffer code is able to generate end caps faithfully.

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[])

public BufferInputLineSimplifier(Coordinate[] inputLine)

Parameters

inputLine Coordinate[]

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.

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

Parameters

inputLine Coordinate[]

The coordinate list to simplify

distanceTol double

simplification distance tolerance to use

Returns

Coordinate[]

The simplified coordinate list

Simplify(double)

Simplify the input coordinate list.

public Coordinate[] Simplify(double distanceTol)

Parameters

distanceTol double

Simplification distance tolerance to use

Returns

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.