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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: * VectorDataItem.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 getVector(), renamed getDeltaX() --> getVectorX(), 39: * and likewise for getDeltaY() (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 org.jfree.data.ComparableObjectItem; 47: 48: /** 49: * A data item representing data in the form (x, y, deltaX, deltaY), intended 50: * for use by the {@link VectorSeries} class. 51: * 52: * @since 1.0.6 53: */ 54: public class VectorDataItem extends ComparableObjectItem { 55: 56: /** 57: * Creates a new instance of <code>YIntervalItem</code>. 58: * 59: * @param x the x-value. 60: * @param y the y-value. 61: * @param deltaX the vector x. 62: * @param deltaY the vector y. 63: */ 64: public VectorDataItem(double x, double y, double deltaX, double deltaY) { 65: super(new XYCoordinate(x, y), new Vector(deltaX, deltaY)); 66: } 67: 68: /** 69: * Returns the x-value. 70: * 71: * @return The x-value (never <code>null</code>). 72: */ 73: public double getXValue() { 74: XYCoordinate xy = (XYCoordinate) getComparable(); 75: return xy.getX(); 76: } 77: 78: /** 79: * Returns the y-value. 80: * 81: * @return The y-value. 82: */ 83: public double getYValue() { 84: XYCoordinate xy = (XYCoordinate) getComparable(); 85: return xy.getY(); 86: } 87: 88: /** 89: * Returns the vector. 90: * 91: * @return The vector (possibly <code>null</code>). 92: */ 93: public Vector getVector() { 94: return (Vector) getObject(); 95: } 96: 97: /** 98: * Returns the x-component for the vector. 99: * 100: * @return The x-component. 101: */ 102: public double getVectorX() { 103: Vector vi = (Vector) getObject(); 104: if (vi != null) { 105: return vi.getX(); 106: } 107: else { 108: return Double.NaN; 109: } 110: } 111: 112: /** 113: * Returns the y-component for the vector. 114: * 115: * @return The y-component. 116: */ 117: public double getVectorY() { 118: Vector vi = (Vector) getObject(); 119: if (vi != null) { 120: return vi.getY(); 121: } 122: else { 123: return Double.NaN; 124: } 125: } 126: 127: }