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/*
* The JTS Topology Suite is a collection of Java classes that
* implement the fundamental operations required to validate a given
* geo-spatial data set to a known topological specification.
*
* Copyright (C) 2001 Vivid Solutions
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* For more information, contact:
*
* Vivid Solutions
* Suite #1A
* 2328 Government Street
* Victoria BC V8T 5G5
* Canada
*
* (250)385-6040
* www.vividsolutions.com
*/
package com.vividsolutions.jts.noding;
import java.util.*;
import com.vividsolutions.jts.algorithm.LineIntersector;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.impl.CoordinateArraySequence;
import com.vividsolutions.jts.io.WKTWriter;
/**
* Represents a list of contiguous line segments,
* and supports noding the segments.
* The line segments are represented by an array of {@link Coordinate}s.
* Intended to optimize the noding of contiguous segments by
* reducing the number of allocated objects.
* SegmentStrings can carry a context object, which is useful
* for preserving topological or parentage information.
* All noded substrings are initialized with the same context object.
*
* @version 1.7
*/
public class BasicSegmentString
implements SegmentString
{
private Coordinate[] pts;
private Object data;
/**
* Creates a new segment string from a list of vertices.
*
* @param pts the vertices of the segment string
* @param data the user-defined data of this segment string (may be null)
*/
public BasicSegmentString(Coordinate[] pts, Object data)
{
this.pts = pts;
this.data = data;
}
/**
* Gets the user-defined data for this segment string.
*
* @return the user-defined data
*/
public Object getData() { return data; }
/**
* Sets the user-defined data for this segment string.
*
* @param data an Object containing user-defined data
*/
public void setData(Object data) { this.data = data; }
public int size() { return pts.length; }
public Coordinate getCoordinate(int i) { return pts[i]; }
public Coordinate[] getCoordinates() { return pts; }
public boolean isClosed()
{
return pts[0].equals(pts[pts.length - 1]);
}
/**
* Gets the octant of the segment starting at vertex index
.
*
* @param index the index of the vertex starting the segment. Must not be
* the last index in the vertex list
* @return the octant of the segment at the vertex
*/
public int getSegmentOctant(int index)
{
if (index == pts.length - 1) return -1;
return Octant.octant(getCoordinate(index), getCoordinate(index + 1));
}
public String toString()
{
return WKTWriter.toLineString(new CoordinateArraySequence(pts));
}
}