Class SweepLineEvent

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.index.sweepline;
16
17	/**
18	* @version 1.7
19	*/
20	public class SweepLineEvent
21	implements Comparable
22	{
23	public static final int INSERT = 1;
24	public static final int DELETE = 2;
25
26	private double xValue;
27	private int eventType;
28	private SweepLineEvent insertEvent; // null if this is an INSERT event
29	private int deleteEventIndex;
30
31	SweepLineInterval sweepInt;
32	public SweepLineEvent(double x, SweepLineEvent insertEvent, SweepLineInterval sweepInt)
33	{
34	xValue = x;
35	this.insertEvent = insertEvent;
36	this.eventType = INSERT;
37	if (insertEvent != null)
38	eventType = DELETE;
39	this.sweepInt = sweepInt;
40	}
41
42	public boolean isInsert() { return insertEvent == null; }
43	public boolean isDelete() { return insertEvent != null; }
44	public SweepLineEvent getInsertEvent() { return insertEvent; }
45	public int getDeleteEventIndex() { return deleteEventIndex; }
46	public void setDeleteEventIndex(int deleteEventIndex) { this.deleteEventIndex = deleteEventIndex; }
47
48	SweepLineInterval getInterval() { return sweepInt; }
49
50	/**
51	* ProjectionEvents are ordered first by their x-value, and then by their eventType.
52	* It is important that Insert events are sorted before Delete events, so that
53	* items whose Insert and Delete events occur at the same x-value will be
54	* correctly handled.
55	*/
56	public int compareTo(Object o) {
57	SweepLineEvent pe = (SweepLineEvent) o;
58	if (xValue < pe.xValue) return -1;
59	if (xValue > pe.xValue) return 1;
60	if (eventType < pe.eventType) return -1;
61	if (eventType > pe.eventType) return 1;
62	return 0;
63	}
64
65
66	}
67