Class ConstraintVertex

1	/*
2	* Copyright (c) 2016 Vivid Solutions.
3	*
4	* All rights reserved. This program and the accompanying materials
5	* are made available under the terms of the Eclipse Public License 2.0
6	* and Eclipse Distribution License v. 1.0 which accompanies this distribution.
7	* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v20.html
8	* and the Eclipse Distribution License is available at
9	*
10	* http://www.eclipse.org/org/documents/edl-v10.php.
11	*/
12	package org.locationtech.jts.triangulate;
13
14
15	import org.locationtech.jts.geom.Coordinate;
16	import org.locationtech.jts.triangulate.quadedge.Vertex;
17
18	/**
19	* A vertex in a Constrained Delaunay Triangulation.
20	* The vertex may or may not lie on a constraint.
21	* If it does it may carry extra information about the original constraint.
22	*
23	* @author Martin Davis
24	*/
25	public class ConstraintVertex extends Vertex {
26	private boolean isOnConstraint;
27	private Object constraint = null;
28
29	/**
30	* Creates a new constraint vertex
31	*
32	* @param p the location of the vertex
33	*/
34	public ConstraintVertex(Coordinate p) {
35	super(p);
36	}
37
38	/**
39	* Sets whether this vertex lies on a constraint.
40	*
41	* @param isOnConstraint true if this vertex lies on a constraint
42	*/
43	public void setOnConstraint(boolean isOnConstraint) {
44	this.isOnConstraint = isOnConstraint;
45	}
46
47	/**
48	* Tests whether this vertex lies on a constraint.
49	*
50	* @return true if the vertex lies on a constraint
51	*/
52	public boolean isOnConstraint() {
53	return isOnConstraint;
54	}
55
56	/**
57	* Sets the external constraint information
58	*
59	* @param constraint an object which carries information about the constraint this vertex lies on
60	*/
61	public void setConstraint(Object constraint) {
62	isOnConstraint = true;
63	this.constraint = constraint;
64	}
65
66	/**
67	* Gets the external constraint object
68	*
69	* @return the external constraint object
70	*/
71	public Object getConstraint() {
72	return constraint;
73	}
74
75	/**
76	* Merges the constraint data in the vertex <tt>other</tt> into this vertex.
77	* This method is called when an inserted vertex is
78	* very close to an existing vertex in the triangulation.
79	*
80	* @param other the constraint vertex to merge
81	*/
82	protected void merge(ConstraintVertex other) {
83	if (other.isOnConstraint) {
84	isOnConstraint = true;
85	constraint = other.constraint;
86	}
87	}
88	}
89