001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2008, 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 * XYCoordinate.java
029 * -----------------
030 * (C) Copyright 2007, 2008, by Object Refinery Limited and Contributors.
031 *
032 * Original Author: David Gilbert (for Object Refinery Limited);
033 * Contributor(s): -;
034 *
035 * Changes
036 * -------
037 * 30-Jan-2007 : Version 1 (DG);
038 * 25-May-2007 : Moved from experimental to the main source tree (DG);
039 *
040 */
041
042 package org.jfree.data.xy;
043
044 import java.io.Serializable;
045
046 /**
047 * Represents an (x, y) coordinate.
048 *
049 * @since 1.0.6
050 */
051 public class XYCoordinate implements Comparable, Serializable {
052
053 /** The x-coordinate. */
054 private double x;
055
056 /** The y-coordinate. */
057 private double y;
058
059 /**
060 * Creates a new coordinate for the point (0.0, 0.0).
061 */
062 public XYCoordinate() {
063 this(0.0, 0.0);
064 }
065
066 /**
067 * Creates a new coordinate for the point (x, y).
068 *
069 * @param x the x-coordinate.
070 * @param y the y-coordinate.
071 */
072 public XYCoordinate(double x, double y) {
073 this.x = x;
074 this.y = y;
075 }
076
077 /**
078 * Returns the x-coordinate.
079 *
080 * @return The x-coordinate.
081 */
082 public double getX() {
083 return this.x;
084 }
085
086 /**
087 * Returns the y-coordinate.
088 *
089 * @return The y-coordinate.
090 */
091 public double getY() {
092 return this.y;
093 }
094
095 /**
096 * Tests this coordinate for equality with an arbitrary object.
097 *
098 * @param obj the object (<code>null</code> permitted).
099 *
100 * @return A boolean.
101 */
102 public boolean equals(Object obj) {
103 if (obj == this) {
104 return true;
105 }
106 if (!(obj instanceof XYCoordinate)) {
107 return false;
108 }
109 XYCoordinate that = (XYCoordinate) obj;
110 if (this.x != that.x) {
111 return false;
112 }
113 if (this.y != that.y) {
114 return false;
115 }
116 return true;
117 }
118
119 /**
120 * Returns a hash code for this instance.
121 *
122 * @return A hash code.
123 */
124 public int hashCode() {
125 int result = 193;
126 long temp = Double.doubleToLongBits(this.x);
127 result = 37 * result + (int) (temp ^ (temp >>> 32));
128 temp = Double.doubleToLongBits(this.y);
129 result = 37 * result + (int) (temp ^ (temp >>> 32));
130 return result;
131 }
132
133 /**
134 * Returns a string representation of this instance, primarily for
135 * debugging purposes.
136 *
137 * @return A string.
138 */
139 public String toString() {
140 return "(" + this.x + ", " + this.y + ")";
141 }
142
143 /**
144 * Compares this instance against an arbitrary object.
145 *
146 * @param obj the object (<code>null</code> not permitted).
147 *
148 * @return An integer indicating the relative order of the items.
149 */
150 public int compareTo(Object obj) {
151 if (!(obj instanceof XYCoordinate)) {
152 throw new IllegalArgumentException("Incomparable object.");
153 }
154 XYCoordinate that = (XYCoordinate) obj;
155 if (this.x > that.x) {
156 return 1;
157 }
158 else if (this.x < that.x) {
159 return -1;
160 }
161 else {
162 if (this.y > that.y) {
163 return 1;
164 }
165 else if (this.y < that.y) {
166 return -1;
167 }
168 }
169 return 0;
170 }
171
172 }