com.revolsys.jts.noding.snapround

Class SimpleSnapRounder

java.lang.Object

com.revolsys.jts.noding.snapround.SimpleSnapRounder

All Implemented Interfaces:

Noder

public class SimpleSnapRounder
extends Object
implements Noder

Uses Snap Rounding to compute a rounded, fully noded arrangement from a set of SegmentStrings. Implements the Snap Rounding technique described in the papers by Hobby, Guibas & Marimont, and Goodrich et al. Snap Rounding assumes that all vertices lie on a uniform grid; hence the precision model of the input must be fixed precision, and all the input vertices must be rounded to that precision.

This implementation uses simple iteration over the line segments. This is not the most efficient approach for large sets of segments.

This implementation appears to be fully robust using an integer precision model. It will function with non-integer precision models, but the results are not 100% guaranteed to be correctly noded.

Version:

1.7

Constructor Summary

Constructors

Constructor and Description
SimpleSnapRounder(double scale)

Method Summary

Methods

Modifier and Type	Method and Description
void	computeNodes(Collection<NodedSegmentString> inputSegmentStrings) Computes the noding for a collection of SegmentStrings.
void	computeVertexSnaps(Collection edges) Computes nodes introduced as a result of snapping segments to vertices of other segments
Collection<NodedSegmentString>	getNodedSubstrings() Returns a Collection of fully noded SegmentStrings.

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleSnapRounder

public SimpleSnapRounder(double scale)

Method Detail

computeNodes

public void computeNodes(Collection<NodedSegmentString> inputSegmentStrings)

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:

inputSegmentStrings - a Collection of NodedSegmentStrings

computeVertexSnaps

public void computeVertexSnaps(Collection edges)

Computes nodes introduced as a result of snapping segments to vertices of other segments

Parameters:

edges - the list of segment strings to snap together

getNodedSubstrings

public Collection<NodedSegmentString> 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 NodedSegmentStrings representing the substrings