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1: /* =========================================================== 2: * JFreeChart : a free chart library for the Java(tm) platform 3: * =========================================================== 4: * 5: * (C) Copyright 2000-2006, 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: * XYBarDataset.java 29: * ----------------- 30: * (C) Copyright 2004-2006, by Object Refinery Limited and Contributors. 31: * 32: * Original Author: David Gilbert (for Object Refinery Limited); 33: * Contributor(s): -; 34: * 35: * $Id: XYBarDataset.java,v 1.4.2.2 2006/08/03 16:22:40 mungady Exp $ 36: * 37: * Changes 38: * ------- 39: * 02-Mar-2004 : Version 1 (DG); 40: * 05-May-2004 : Now extends AbstractIntervalXYDataset (DG); 41: * 15-Jul-2004 : Switched getX() with getXValue() and getY() with 42: * getYValue() (DG); 43: * 44: */ 45: 46: package org.jfree.data.xy; 47: 48: import org.jfree.data.general.DatasetChangeEvent; 49: import org.jfree.data.general.DatasetChangeListener; 50: 51: /** 52: * A dataset wrapper class that converts a standard {@link XYDataset} into an 53: * {@link IntervalXYDataset} suitable for use in creating XY bar charts. 54: */ 55: public class XYBarDataset extends AbstractIntervalXYDataset 56: implements IntervalXYDataset, DatasetChangeListener { 57: 58: /** The underlying dataset. */ 59: private XYDataset underlying; 60: 61: /** The bar width. */ 62: private double barWidth; 63: 64: /** 65: * Creates a new dataset. 66: * 67: * @param underlying the underlying dataset. 68: * @param barWidth the width of the bars. 69: */ 70: public XYBarDataset(XYDataset underlying, double barWidth) { 71: this.underlying = underlying; 72: this.underlying.addChangeListener(this); 73: this.barWidth = barWidth; 74: } 75: 76: /** 77: * Returns the number of series in the dataset. 78: * 79: * @return The series count. 80: */ 81: public int getSeriesCount() { 82: return this.underlying.getSeriesCount(); 83: } 84: 85: /** 86: * Returns the key for a series. 87: * 88: * @param series the series index (in the range <code>0</code> to 89: * <code>getSeriesCount() - 1</code>). 90: * 91: * @return The series key. 92: */ 93: public Comparable getSeriesKey(int series) { 94: return this.underlying.getSeriesKey(series); 95: } 96: 97: /** 98: * Returns the number of items in a series. 99: * 100: * @param series the series index (zero-based). 101: * 102: * @return The item count. 103: */ 104: public int getItemCount(int series) { 105: return this.underlying.getItemCount(series); 106: } 107: 108: /** 109: * Returns the x-value for an item within a series. The x-values may or 110: * may not be returned in ascending order, that is up to the class 111: * implementing the interface. 112: * 113: * @param series the series index (zero-based). 114: * @param item the item index (zero-based). 115: * 116: * @return The x-value. 117: */ 118: public Number getX(int series, int item) { 119: return this.underlying.getX(series, item); 120: } 121: 122: /** 123: * Returns the y-value for an item within a series. 124: * 125: * @param series the series index (zero-based). 126: * @param item the item index (zero-based). 127: * 128: * @return The y-value (possibly <code>null</code>). 129: */ 130: public Number getY(int series, int item) { 131: return this.underlying.getY(series, item); 132: } 133: 134: /** 135: * Returns the starting X value for the specified series and item. 136: * 137: * @param series the series index (zero-based). 138: * @param item the item index (zero-based). 139: * 140: * @return The value. 141: */ 142: public Number getStartX(int series, int item) { 143: Number result = null; 144: Number xnum = this.underlying.getX(series, item); 145: if (xnum != null) { 146: result = new Double(xnum.doubleValue() - this.barWidth / 2.0); 147: } 148: return result; 149: } 150: 151: /** 152: * Returns the ending X value for the specified series and item. 153: * 154: * @param series the series index (zero-based). 155: * @param item the item index (zero-based). 156: * 157: * @return The value. 158: */ 159: public Number getEndX(int series, int item) { 160: Number result = null; 161: Number xnum = this.underlying.getX(series, item); 162: if (xnum != null) { 163: result = new Double(xnum.doubleValue() + this.barWidth / 2.0); 164: } 165: return result; 166: } 167: 168: /** 169: * Returns the starting Y value for the specified series and item. 170: * 171: * @param series the series index (zero-based). 172: * @param item the item index (zero-based). 173: * 174: * @return The value. 175: */ 176: public Number getStartY(int series, int item) { 177: return this.underlying.getY(series, item); 178: } 179: 180: /** 181: * Returns the ending Y value for the specified series and item. 182: * 183: * @param series the series index (zero-based). 184: * @param item the item index (zero-based). 185: * 186: * @return The value. 187: */ 188: public Number getEndY(int series, int item) { 189: return this.underlying.getY(series, item); 190: } 191: 192: /** 193: * Receives notification of an dataset change event. 194: * 195: * @param event information about the event. 196: */ 197: public void datasetChanged(DatasetChangeEvent event) { 198: this.notifyListeners(event); 199: } 200: 201: }