JTS Topology Suite - v 1.12

com.vividsolutions.jts.geomgraph.index
Class MonotoneChainEdge

java.lang.Object
  extended by com.vividsolutions.jts.geomgraph.index.MonotoneChainEdge

public class MonotoneChainEdge
extends java.lang.Object

MonotoneChains are a way of partitioning the segments of an edge to allow for fast searching of intersections. They have the following properties:

  1. the segments within a monotone chain will never intersect each other
  2. the envelope of any contiguous subset of the segments in a monotone chain is simply the envelope of the endpoints of the subset.
Property 1 means that there is no need to test pairs of segments from within the same monotone chain for intersection. Property 2 allows binary search to be used to find the intersection points of two monotone chains. For many types of real-world data, these properties eliminate a large number of segment comparisons, producing substantial speed gains.

Version:
1.7

Constructor Summary
MonotoneChainEdge(Edge e)
           
 
Method Summary
 void computeIntersects(MonotoneChainEdge mce, SegmentIntersector si)
           
 void computeIntersectsForChain(int chainIndex0, MonotoneChainEdge mce, int chainIndex1, SegmentIntersector si)
           
 Coordinate[] getCoordinates()
           
 double getMaxX(int chainIndex)
           
 double getMinX(int chainIndex)
           
 int[] getStartIndexes()
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

MonotoneChainEdge

public MonotoneChainEdge(Edge e)
Method Detail

getCoordinates

public Coordinate[] getCoordinates()

getStartIndexes

public int[] getStartIndexes()

getMinX

public double getMinX(int chainIndex)

getMaxX

public double getMaxX(int chainIndex)

computeIntersects

public void computeIntersects(MonotoneChainEdge mce,
                              SegmentIntersector si)

computeIntersectsForChain

public void computeIntersectsForChain(int chainIndex0,
                                      MonotoneChainEdge mce,
                                      int chainIndex1,
                                      SegmentIntersector si)

JTS Topology Suite - v 1.12