Java tutorial
/* =========================================================== * JFreeChart : a free chart library for the Java(tm) platform * =========================================================== * * (C) Copyright 2000-2013, 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, * USA. * * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. * Other names may be trademarks of their respective owners.] * * ------------------------ * XYItemRendererState.java * ------------------------ * (C) Copyright 2003-2008, by Object Refinery Limited and Contributors. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): Ulrich Voigt; * Greg Darke; * * Changes: * -------- * 07-Oct-2003 : Version 1 (DG); * 27-Jan-2004 : Added workingLine attribute (DG); * ------------- JFREECHART 1.0.x --------------------------------------------- * 04-May-2007 : Added processVisibleItemsOnly flag (DG); * 09-Jul-2008 : Added start/endSeriesPass() methods - see patch 1997549 by * Ulrich Voigt (DG); * 19-Sep-2008 : Added first and last item indices, based on patch by Greg * Darke (DG); * */ package org.jfree.chart.renderer.xy; import java.awt.geom.Line2D; import org.jfree.chart.plot.PlotRenderingInfo; import org.jfree.chart.plot.XYPlot; import org.jfree.chart.renderer.RendererState; import org.jfree.data.xy.XYDataset; /** * The state for an {@link XYItemRenderer}. */ public class XYItemRendererState extends RendererState { /** * The first item in the series that will be displayed. * * @since 1.0.11 */ private int firstItemIndex; /** * The last item in the current series that will be displayed. * * @since 1.0.11 */ private int lastItemIndex; /** * A line object that the renderer can reuse to save instantiating a lot * of objects. */ public Line2D workingLine; /** * A flag that controls whether the plot should pass ALL data items to the * renderer, or just the items that will be visible. * * @since 1.0.6 */ private boolean processVisibleItemsOnly; /** * Creates a new state. * * @param info the plot rendering info. */ public XYItemRendererState(PlotRenderingInfo info) { super(info); this.workingLine = new Line2D.Double(); this.processVisibleItemsOnly = true; } /** * Returns the flag that controls whether the plot passes all data * items in each series to the renderer, or just the visible items. The * default value is <code>true</code>. * * @return A boolean. * * @since 1.0.6 * * @see #setProcessVisibleItemsOnly(boolean) */ public boolean getProcessVisibleItemsOnly() { return this.processVisibleItemsOnly; } /** * Sets the flag that controls whether the plot passes all data * items in each series to the renderer, or just the visible items. * * @param flag the new flag value. * * @since 1.0.6 */ public void setProcessVisibleItemsOnly(boolean flag) { this.processVisibleItemsOnly = flag; } /** * Returns the first item index (this is updated with each call to * {@link #startSeriesPass(XYDataset, int, int, int, int, int)}. * * @return The first item index. * * @since 1.0.11 */ public int getFirstItemIndex() { return this.firstItemIndex; } /** * Returns the last item index (this is updated with each call to * {@link #startSeriesPass(XYDataset, int, int, int, int, int)}. * * @return The last item index. * * @since 1.0.11 */ public int getLastItemIndex() { return this.lastItemIndex; } /** * This method is called by the {@link XYPlot} when it starts a pass * through the (visible) items in a series. The default implementation * records the first and last item indices - override this method to * implement additional specialised behaviour. * * @param dataset the dataset. * @param series the series index. * @param firstItem the index of the first item in the series. * @param lastItem the index of the last item in the series. * @param pass the pass index. * @param passCount the number of passes. * * @see #endSeriesPass(XYDataset, int, int, int, int, int) * * @since 1.0.11 */ public void startSeriesPass(XYDataset dataset, int series, int firstItem, int lastItem, int pass, int passCount) { this.firstItemIndex = firstItem; this.lastItemIndex = lastItem; } /** * This method is called by the {@link XYPlot} when it ends a pass * through the (visible) items in a series. The default implementation * does nothing, but you can override this method to implement specialised * behaviour. * * @param dataset the dataset. * @param series the series index. * @param firstItem the index of the first item in the series. * @param lastItem the index of the last item in the series. * @param pass the pass index. * @param passCount the number of passes. * * @see #startSeriesPass(XYDataset, int, int, int, int, int) * * @since 1.0.11 */ public void endSeriesPass(XYDataset dataset, int series, int firstItem, int lastItem, int pass, int passCount) { // do nothing...this is just a hook for subclasses } }