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1: /* =========================================================== 2: * JFreeChart : a free chart library for the Java(tm) platform 3: * =========================================================== 4: * 5: * (C) Copyright 2000-2007, 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: * Vector.java 29: * ----------- 30: * (C) Copyright 2007, by Object Refinery Limited. 31: * 32: * Original Author: David Gilbert (for Object Refinery Limited); 33: * Contributor(s): -; 34: * 35: * Changes 36: * ------- 37: * 30-Jan-2007 : Version 1 (DG); 38: * 24-May-2007 : Added getLength() and getAngle() methods, thanks to 39: * matinh (DG); 40: * 25-May-2007 : Moved from experimental to the main source tree (DG); 41: * 42: */ 43: 44: package org.jfree.data.xy; 45: 46: import java.io.Serializable; 47: 48: /** 49: * A vector. 50: * 51: * @since 1.0.6 52: */ 53: public class Vector implements Serializable { 54: 55: /** The vector x. */ 56: private double x; 57: 58: /** The vector y. */ 59: private double y; 60: 61: /** 62: * Creates a new instance of <code>Vector</code>. 63: * 64: * @param x the x-component. 65: * @param y the y-component. 66: */ 67: public Vector(double x, double y) { 68: this.x = x; 69: this.y = y; 70: } 71: 72: /** 73: * Returns the x-value. 74: * 75: * @return The x-value. 76: */ 77: public double getX() { 78: return this.x; 79: } 80: 81: /** 82: * Returns the y-value. 83: * 84: * @return The y-value. 85: */ 86: public double getY() { 87: return this.y; 88: } 89: 90: /** 91: * Returns the length of the vector. 92: * 93: * @return The vector length. 94: */ 95: public double getLength() { 96: return Math.sqrt((this.x * this.x) + (this.y * this.y)); 97: } 98: 99: /** 100: * Returns the angle of the vector. 101: * 102: * @return The angle of the vector. 103: */ 104: public double getAngle() { 105: return Math.atan2(this.y, this.x); 106: } 107: 108: /** 109: * Tests this vector for equality with an arbitrary object. 110: * 111: * @param obj the object (<code>null</code> not permitted). 112: * 113: * @return A boolean. 114: */ 115: public boolean equals(Object obj) { 116: if (obj == this) { 117: return true; 118: } 119: if (!(obj instanceof Vector)) { 120: return false; 121: } 122: Vector that = (Vector) obj; 123: if (this.x != that.x) { 124: return false; 125: } 126: if (this.y != that.y) { 127: return false; 128: } 129: return true; 130: } 131: 132: /** 133: * Returns a hash code for this instance. 134: * 135: * @return A hash code. 136: */ 137: public int hashCode() { 138: int result = 193; 139: long temp = Double.doubleToLongBits(this.x); 140: result = 37 * result + (int) (temp ^ (temp >>> 32)); 141: temp = Double.doubleToLongBits(this.y); 142: result = 37 * result + (int) (temp ^ (temp >>> 32)); 143: return result; 144: } 145: 146: }