Class EdgeIntersection

1
2
3
4	/*
5	* Copyright (c) 2016 Vivid Solutions.
6	*
7	* All rights reserved. This program and the accompanying materials
8	* are made available under the terms of the Eclipse Public License 2.0
9	* and Eclipse Distribution License v. 1.0 which accompanies this distribution.
10	* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v20.html
11	* and the Eclipse Distribution License is available at
12	*
13	* http://www.eclipse.org/org/documents/edl-v10.php.
14	*/
15	package org.locationtech.jts.geomgraph;
16
17	import java.io.PrintStream;
18
19	import org.locationtech.jts.geom.Coordinate;
20
21	/**
22	* Represents a point on an
23	* edge which intersects with another edge.
24	* <p>
25	* The intersection may either be a single point, or a line segment
26	* (in which case this point is the start of the line segment)
27	* The intersection point must be precise.
28	*
29	* @version 1.7
30	*/
31	public class EdgeIntersection
32	implements Comparable
33	{
34
35	public Coordinate coord; // the point of intersection
36	public int segmentIndex; // the index of the containing line segment in the parent edge
37	public double dist; // the edge distance of this point along the containing line segment
38
39	public EdgeIntersection(Coordinate coord, int segmentIndex, double dist) {
40	this.coord = new Coordinate(coord);
41	this.segmentIndex = segmentIndex;
42	this.dist = dist;
43	}
44
45	public Coordinate getCoordinate() { return coord; }
46
47	public int getSegmentIndex() { return segmentIndex; }
48
49	public double getDistance() { return dist; }
50
51	public int compareTo(Object obj)
52	{
53	EdgeIntersection other = (EdgeIntersection) obj;
54	return compare(other.segmentIndex, other.dist);
55	}
56	/**
57	* @return -1 this EdgeIntersection is located before the argument location
58	* @return 0 this EdgeIntersection is at the argument location
59	* @return 1 this EdgeIntersection is located after the argument location
60	*/
61	public int compare(int segmentIndex, double dist)
62	{
63	if (this.segmentIndex < segmentIndex) return -1;
64	if (this.segmentIndex > segmentIndex) return 1;
65	if (this.dist < dist) return -1;
66	if (this.dist > dist) return 1;
67	return 0;
68	}
69
70	public boolean isEndPoint(int maxSegmentIndex)
71	{
72	if (segmentIndex == 0 && dist == 0.0) return true;
73	if (segmentIndex == maxSegmentIndex) return true;
74	return false;
75	}
76
77	public void print(PrintStream out)
78	{
79	out.print(coord);
80	out.print(" seg # = " + segmentIndex);
81	out.println(" dist = " + dist);
82	}
83	public String toString()
84	{
85	return coord + " seg # = " + segmentIndex + " dist = " + dist;
86	}
87	}
88