Java tutorial
/* =========================================================== * JFreeChart : a free chart library for the Java(tm) platform * =========================================================== * * (C) Copyright 2000-2004, by Object Refinery Limited and Contributors. * * Project Info: http://www.jfree.org/jfreechart/index.html * * This library is free software; you can redistribute it and/or modify it under the terms * of the GNU Lesser General Public License as published by the Free Software Foundation; * either version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * See the GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License along with this * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, * Boston, MA 02111-1307, USA. * * [Java is a trademark or registered trademark of Sun Microsystems, Inc. * in the United States and other countries.] * * ---------------------------- * SimpleIntervalXYDataset.java * ---------------------------- * (C) Copyright 2002-2004, by Object Refinery Limited and Contributors. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * * $Id: SimpleIntervalXYDataset.java,v 1.10 2004/05/06 08:38:54 mungady Exp $ * * Changes (since 11-Oct-2002) * --------------------------- * 11-Oct-2002 : Fixed errors reported by Checkstyle (DG); * 05-May-2004 : Now extends AbstractIntervalXYDataset (DG); * */ package org.jfree.chart.demo; import org.jfree.data.general.DatasetChangeListener; import org.jfree.data.xy.AbstractIntervalXYDataset; import org.jfree.data.xy.IntervalXYDataset; /** * A quick and dirty sample dataset. */ public class SimpleIntervalXYDataset extends AbstractIntervalXYDataset implements IntervalXYDataset { /** The start values. */ private Double[] xStart = new Double[3]; /** The end values. */ private Double[] xEnd = new Double[3]; /** The y values. */ private Double[] yValues = new Double[3]; /** * Creates a new dataset. */ public SimpleIntervalXYDataset() { this.xStart[0] = new Double(0.0); this.xStart[1] = new Double(2.0); this.xStart[2] = new Double(3.5); this.xEnd[0] = new Double(2.0); this.xEnd[1] = new Double(3.5); this.xEnd[2] = new Double(4.0); this.yValues[0] = new Double(3.0); this.yValues[1] = new Double(4.5); this.yValues[2] = new Double(2.5); } /** * Returns the number of series in the dataset. * * @return the number of series in the dataset. */ public int getSeriesCount() { return 1; } /** * Returns the name of a series. * * @param series the series (zero-based index). * * @return the series name. */ public String getSeriesName(final int series) { return "Series 1"; } /** * Returns the number of items in a series. * * @param series the series (zero-based index). * * @return the number of items within a series. */ public int getItemCount(final int series) { return 3; } /** * Returns the x-value for an item within a series. * <P> * The implementation is responsible for ensuring that the x-values are presented in ascending * order. * * @param series the series (zero-based index). * @param item the item (zero-based index). * * @return the x-value for an item within a series. */ public double getXValue(final int series, final int item) { return this.xStart[item].doubleValue(); } /** * Returns the y-value for an item within a series. * * @param series the series (zero-based index). * @param item the item (zero-based index). * * @return the y-value for an item within a series. */ public double getYValue(final int series, final int item) { return this.yValues[item].doubleValue(); } /** * Returns the starting X value for the specified series and item. * * @param series the series (zero-based index). * @param item the item within a series (zero-based index). * * @return the start x value. */ public double getStartXValue(final int series, final int item) { return this.xStart[item].doubleValue(); } /** * Returns the ending X value for the specified series and item. * * @param series the series (zero-based index). * @param item the item within a series (zero-based index). * * @return the end x value. */ public double getEndXValue(final int series, final int item) { return this.xEnd[item].doubleValue(); } /** * Returns the starting Y value for the specified series and item. * * @param series the series (zero-based index). * @param item the item within a series (zero-based index). * * @return the start y value. */ public double getStartYValue(final int series, final int item) { return this.yValues[item].doubleValue(); } /** * Returns the ending Y value for the specified series and item. * * @param series the series (zero-based index). * @param item the item within a series (zero-based index). * * @return the end y value. */ public double getEndYValue(final int series, final int item) { return this.yValues[item].doubleValue(); } /** * Registers an object for notification of changes to the dataset. * * @param listener the object to register. */ public void addChangeListener(final DatasetChangeListener listener) { // ignored } /** * Deregisters an object for notification of changes to the dataset. * * @param listener the object to deregister. */ public void removeChangeListener(final DatasetChangeListener listener) { // ignored } /* (non-Javadoc) * @see org.jfree.data.general.AbstractSeriesDataset#getSeriesKey(int) */ public Comparable getSeriesKey(int series) { // TODO Auto-generated method stub return null; } /* (non-Javadoc) * @see org.jfree.data.xy.IntervalXYDataset#getStartX(int, int) */ public Number getStartX(int series, int item) { // TODO Auto-generated method stub return null; } /* (non-Javadoc) * @see org.jfree.data.xy.IntervalXYDataset#getEndX(int, int) */ public Number getEndX(int series, int item) { // TODO Auto-generated method stub return null; } /* (non-Javadoc) * @see org.jfree.data.xy.IntervalXYDataset#getStartY(int, int) */ public Number getStartY(int series, int item) { // TODO Auto-generated method stub return null; } /* (non-Javadoc) * @see org.jfree.data.xy.IntervalXYDataset#getEndY(int, int) */ public Number getEndY(int series, int item) { // TODO Auto-generated method stub return null; } /* (non-Javadoc) * @see org.jfree.data.xy.XYDataset#getX(int, int) */ public Number getX(int series, int item) { // TODO Auto-generated method stub return null; } /* (non-Javadoc) * @see org.jfree.data.xy.XYDataset#getY(int, int) */ public Number getY(int series, int item) { // TODO Auto-generated method stub return null; } }