SimpleSnapRounder

com.vividsolutions.jts.noding.snapround

Class SimpleSnapRounder

java.lang.Object
- com.vividsolutions.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.

Constructor Summary

Constructors

Constructor and Description
`SimpleSnapRounder(PrecisionModel pm)`

Method Summary

All Methods

Instance Methods

Concrete Methods
Modifier and Type	Method and Description
`void`	`computeNodes(Collection inputSegmentStrings)` Computes the noding for a collection of `SegmentString`s.
`void`	`computeVertexSnaps(Collection edges)` Computes nodes introduced as a result of snapping segments to vertices of other segments
`Collection`	`getNodedSubstrings()` Returns a `Collection` of fully noded `SegmentString`s.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - SimpleSnapRounder
```
public SimpleSnapRounder(PrecisionModel pm)
```
- Method Detail
  - 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 NodedSegmentStrings representing the substrings
  - computeNodes
```
public void computeNodes(Collection 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