001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
006 *
007 * Project Info: http://www.jfree.org/jfreechart/index.html
008 *
009 * This library is free software; you can redistribute it and/or modify it
010 * under the terms of the GNU Lesser General Public License as published by
011 * the Free Software Foundation; either version 2.1 of the License, or
012 * (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but
015 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
016 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
017 * License for more details.
018 *
019 * You should have received a copy of the GNU Lesser General Public
020 * License along with this library; if not, write to the Free Software
021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
022 * USA.
023 *
024 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
025 * in the United States and other countries.]
026 *
027 * ------------------
028 * CompassFormat.java
029 * ------------------
030 * (C) Copyright 2003, 2004, by Sylvain Vieujot and Contributors.
031 *
032 * Original Author: Sylvain Vieujot;
033 * Contributor(s): David Gilbert (for Object Refinery Limited);
034 *
035 * $Id: CompassFormat.java,v 1.3.2.1 2005/10/25 20:37:34 mungady Exp $
036 *
037 * Changes
038 * -------
039 * 18-Feb-2004 : Version 1 contributed by Sylvain Vieujot (DG);
040 *
041 */
042
043 package org.jfree.chart.axis;
044
045 import java.text.FieldPosition;
046 import java.text.NumberFormat;
047 import java.text.ParsePosition;
048
049 /**
050 * A formatter that displays numbers as directions.
051 */
052 public class CompassFormat extends NumberFormat {
053
054 /** North. */
055 private static final String N = "N";
056
057 /** East. */
058 private static final String E = "E";
059
060 /** South. */
061 private static final String S = "S";
062
063 /** West. */
064 private static final String W = "W";
065
066 /** The directions. */
067 public static final String[] DIRECTIONS = {
068 N, N + N + E, N + E, E + N + E, E, E + S + E, S + E, S + S + E, S,
069 S + S + W, S + W, W + S + W, W, W + N + W, N + W, N + N + W, N
070 };
071
072 /**
073 * Creates a new formatter.
074 */
075 public CompassFormat() {
076 super();
077 }
078
079 /**
080 * Returns a string representing the direction.
081 *
082 * @param direction the direction.
083 *
084 * @return A string.
085 */
086 public String getDirectionCode(double direction) {
087
088 direction = direction % 360;
089 if (direction < 0.0) {
090 direction = direction + 360.0;
091 }
092 int index = ((int) Math.floor(direction / 11.25) + 1) / 2;
093 return DIRECTIONS[index];
094
095 }
096
097 /* (non-Javadoc)
098 * @see java.text.NumberFormat#format(double, java.lang.StringBuffer,
099 * java.text.FieldPosition)
100 */
101 public StringBuffer format(double number, StringBuffer toAppendTo,
102 FieldPosition 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 format(long number, StringBuffer toAppendTo,
111 FieldPosition 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 parse(String source, ParsePosition parsePosition) {
125 return null;
126 }
127
128 }