Class SnapRoundingIntersectionAdder

Finds intersections between line segments which will be snap-rounded, and adds them as nodes to the segments.

Intersections are detected and computed using full precision. Snapping takes place in a subsequent phase.

The intersection points are recorded, so that HotPixels can be created for them.

To avoid robustness issues with vertices which lie very close to line segments a heuristic is used: nodes are created if a vertex lies within a tolerance distance of the interior of a segment. The tolerance distance is chosen to be significantly below the snap-rounding grid size. This has empirically proven to eliminate noding failures.

Inheritance

object

SnapRoundingIntersectionAdder

Implements

ISegmentIntersector

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: NetTopologySuite.Noding.Snapround

Assembly: NetTopologySuite.dll

Syntax

public sealed class SnapRoundingIntersectionAdder : ISegmentIntersector

Constructors

SnapRoundingIntersectionAdder(PrecisionModel)

Creates an intersector which finds all snapped interior intersections, and adds them as nodes.

Declaration

[Obsolete]
public SnapRoundingIntersectionAdder(PrecisionModel pm)

Parameters

Type	Name	Description
PrecisionModel	pm	The precision model to use

SnapRoundingIntersectionAdder(double)

Creates an intersector which finds all snapped interior intersections, and adds them as nodes.

Declaration

public SnapRoundingIntersectionAdder(double nearnessTol)

Parameters

Type	Name	Description
double	nearnessTol	the intersection distance tolerance

SnapRoundingIntersectionAdder(double, ElevationModel)

Creates an intersector which finds all snapped interior intersections, and adds them as nodes.

Declaration

public SnapRoundingIntersectionAdder(double nearnessTol, ElevationModel em)

Parameters

Type	Name	Description
double	nearnessTol	the intersection distance tolerance
ElevationModel	em	An elevation model. May be null

Properties

Intersections

Gets the created intersection nodes, so they can be processed as hot pixels.

Declaration

public Collection<Coordinate> Intersections { get; }

Property Value

Type	Description
Collection<Coordinate>	A list of intersection points

IsDone

Always process all intersections

Declaration

public bool IsDone { get; }

Property Value

Type	Description
bool	Always false

Methods

ProcessIntersections(ISegmentString, int, ISegmentString, int)

This method is called by clients of the ISegmentIntersector class to process intersections for two segments of the ISegmentString s being intersected. Note that some clients (such as MonotoneChain s) may optimize away this call for segment pairs which they have determined do not intersect (e.g.by an disjoint envelope test).

Declaration

public void ProcessIntersections(ISegmentString e0, int segIndex0, ISegmentString e1, int segIndex1)

Parameters

Type	Name	Description
ISegmentString	e0
int	segIndex0
ISegmentString	e1
int	segIndex1

Implements

ISegmentIntersector