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Java > Open Source Codes > org > jfree > chart > axis > CompassFormat


1 /* ===========================================================
2  * JFreeChart : a free chart library for the Java(tm) platform
3  * ===========================================================
4  *
5  * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
6  *
7  * Project Info: http://www.jfree.org/jfreechart/index.html
8  *
9  * This library is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU Lesser General Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17  * License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22  * USA.
23  *
24  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
25  * in the United States and other countries.]
26  *
27  * ------------------
28  * CompassFormat.java
29  * ------------------
30  * (C) Copyright 2003, 2004, by Sylvain Vieujot and Contributors.
31  *
32  * Original Author: Sylvain Vieujot;
33  * Contributor(s): David Gilbert (for Object Refinery Limited);
34  *
35  * $Id: CompassFormat.java,v 1.3.2.1 2005/10/25 20:37:34 mungady Exp $
36  *
37  * Changes
38  * -------
39  * 18-Feb-2004 : Version 1 contributed by Sylvain Vieujot (DG);
40  *
41  */
42
43 package org.jfree.chart.axis;
44
45 import java.text.FieldPosition JavaDoc;
46 import java.text.NumberFormat JavaDoc;
47 import java.text.ParsePosition JavaDoc;
48
49 /**
50  * A formatter that displays numbers as directions.
51  */
52 public class CompassFormat extends NumberFormat JavaDoc {
53     
54     /** North. */
55     private static final String JavaDoc N = "N";
56     
57     /** East. */
58     private static final String JavaDoc E = "E";
59     
60     /** South. */
61     private static final String JavaDoc S = "S";
62     
63     /** West. */
64     private static final String JavaDoc W = "W";
65     
66     /** The directions. */
67     public static final String JavaDoc[] DIRECTIONS = {
68         N, N + N + E, N + E, E + N + E, E, E + S + E, S + E, S + S + E, S,
69         S + S + W, S + W, W + S + W, W, W + N + W, N + W, N + N + W, N
70     };
71     
72     /**
73      * Creates a new formatter.
74      */
75     public CompassFormat() {
76         super();
77     }
78     
79     /**
80      * Returns a string representing the direction.
81      *
82      * @param direction the direction.
83      *
84      * @return A string.
85      */
86     public String JavaDoc getDirectionCode(double direction) {
87         
88         direction = direction % 360;
89         if (direction < 0.0) {
90             direction = direction + 360.0;
91         }
92         int index = ((int) Math.floor(direction / 11.25) + 1) / 2;
93         return DIRECTIONS[index];
94         
95     }
96
97     /* (non-Javadoc)
98      * @see java.text.NumberFormat#format(double, java.lang.StringBuffer,
99      * java.text.FieldPosition)
100      */
101     public StringBuffer JavaDoc format(double number, StringBuffer JavaDoc toAppendTo,
102                                FieldPosition JavaDoc pos) {
103         return toAppendTo.append(getDirectionCode(number));
104     }
105
106     /* (non-Javadoc)
107      * @see java.text.NumberFormat#format(long, java.lang.StringBuffer,
108      * java.text.FieldPosition)
109      */
110     public StringBuffer JavaDoc format(long number, StringBuffer JavaDoc toAppendTo,
111                                FieldPosition JavaDoc pos) {
112         return toAppendTo.append(getDirectionCode(number));
113     }
114
115     /**
116      * This method returns <code>null</code> for all inputs. This class cannot
117      * be used for parsing.
118      *
119      * @param source the source string.
120      * @param parsePosition the parse position.
121      *
122      * @return <code>null</code>.
123      */
124     public Number JavaDoc parse(String JavaDoc source, ParsePosition JavaDoc parsePosition) {
125         return null;
126     }
127     
128 }
129
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