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jfreechart example source code file (XYItemRendererState.java)

This example jfreechart source code file (XYItemRendererState.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

awt, geometry, line2d, line2d, rendererstate, rendererstate, xyitemrendererstate, xyitemrendererstate

The jfreechart XYItemRendererState.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, 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.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * ------------------------
 * 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.
     *
     * @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
    }

}

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