Class SegmentExtractingNoder

java.lang.Object

org.locationtech.jts.noding.SegmentExtractingNoder

All Implemented Interfaces:

Noder

public class SegmentExtractingNoder
extends Object
implements Noder

A noder which extracts all line segments as SegmentStrings. This enables fast overlay of geometries which are known to be already fully noded. In particular, it provides fast union of polygonal and linear coverages. Unioning a noded set of lines is an effective way to perform line merging and line dissolving.

No precision reduction is carried out. If that is required, another noder must be used (such as a snap-rounding noder), or the input must be precision-reduced beforehand.

Author:

Martin Davis

Constructor Summary

Constructors

Constructor	Description
SegmentExtractingNoder()	Creates a new segment-extracting noder.

Method Summary

Modifier and Type	Method	Description
void	computeNodes(Collection segStrings)	Computes the noding for a collection of SegmentStrings.
Collection	getNodedSubstrings()	Returns a Collection of fully noded SegmentStrings.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

SegmentExtractingNoder

public SegmentExtractingNoder()

Creates a new segment-extracting noder.

Method Details

computeNodes

public void computeNodes(Collection segStrings)

Description copied from interface: Noder

Computes the noding for a collection of SegmentStrings. Some Noders may add all these nodes to the input SegmentStrings; others may only add some or none at all.

Specified by:

computeNodes in interface Noder

Parameters:

segStrings - a collection of SegmentStrings to node

getNodedSubstrings

public Collection getNodedSubstrings()

Description copied from interface: Noder

Returns a Collection of fully noded SegmentStrings. The SegmentStrings have the same context as their parent.

Specified by:

getNodedSubstrings in interface Noder

Returns:

a Collection of SegmentStrings