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jfreechart example source code file (ChartRenderingInfo.java)

This example jfreechart source code file (ChartRenderingInfo.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, chartrenderinginfo, chartrenderinginfo, classnotfoundexception, clonenotsupportedexception, entitycollection, geometry, io, ioexception, plotrenderinginfo, plotrenderinginfo, publiccloneable, publiccloneable, rectangle2d, rectangle2d, serializable, standardentitycollection

The jfreechart ChartRenderingInfo.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.]
 *
 * -----------------------
 * ChartRenderingInfo.java
 * -----------------------
 * (C) Copyright 2002-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 22-Jan-2002 : Version 1 (DG);
 * 05-Feb-2002 : Added a new constructor, completed Javadoc comments (DG);
 * 05-Mar-2002 : Added a clear() method (DG);
 * 23-May-2002 : Renamed DrawInfo --> ChartRenderingInfo (DG);
 * 26-Sep-2002 : Fixed errors reported by Checkstyle (DG);
 * 17-Sep-2003 : Added PlotRenderingInfo (DG);
 * 01-Nov-2005 : Updated equals() method (DG);
 * 30-Nov-2005 : Removed get/setPlotArea() (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 01-Dec-2006 : Fixed equals() and clone() (DG);
 *
 */

package org.jfree.chart;

import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.io.SerialUtilities;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PublicCloneable;

/**
 * A structure for storing rendering information from one call to the
 * JFreeChart.draw() method.
 * <P>
 * An instance of the {@link JFreeChart} class can draw itself within an
 * arbitrary rectangle on any <code>Graphics2D.  It is assumed that
 * client code will sometimes render the same chart in more than one view, so
 * the {@link JFreeChart} instance does not retain any information about its
 * rendered dimensions.  This information can be useful sometimes, so you have
 * the option to collect the information at each call to
 * <code>JFreeChart.draw(), by passing an instance of this
 * <code>ChartRenderingInfo class.
 */
public class ChartRenderingInfo implements Cloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 2751952018173406822L;

    /** The area in which the chart is drawn. */
    private transient Rectangle2D chartArea;

    /** Rendering info for the chart's plot (and subplots, if any). */
    private PlotRenderingInfo plotInfo;

    /**
     * Storage for the chart entities.  Since retaining entity information for
     * charts with a large number of data points consumes a lot of memory, it
     * is intended that you can set this to <code>null to prevent the
     * information being collected.
     */
    private EntityCollection entities;

    /**
     * Constructs a new ChartRenderingInfo structure that can be used to
     * collect information about the dimensions of a rendered chart.
     */
    public ChartRenderingInfo() {
        this(new StandardEntityCollection());
    }

    /**
     * Constructs a new instance. If an entity collection is supplied, it will
     * be populated with information about the entities in a chart.  If it is
     * <code>null, no entity information (including tool tips) will
     * be collected.
     *
     * @param entities  an entity collection (<code>null permitted).
     */
    public ChartRenderingInfo(EntityCollection entities) {
        this.chartArea = new Rectangle2D.Double();
        this.plotInfo = new PlotRenderingInfo(this);
        this.entities = entities;
    }

    /**
     * Returns the area in which the chart was drawn.
     *
     * @return The area in which the chart was drawn.
     *
     * @see #setChartArea(Rectangle2D)
     */
    public Rectangle2D getChartArea() {
        return this.chartArea;
    }

    /**
     * Sets the area in which the chart was drawn.
     *
     * @param area  the chart area.
     *
     * @see #getChartArea()
     */
    public void setChartArea(Rectangle2D area) {
        this.chartArea.setRect(area);
    }

    /**
     * Returns the collection of entities maintained by this instance.
     *
     * @return The entity collection (possibly <code>null).
     *
     * @see #setEntityCollection(EntityCollection)
     */
    public EntityCollection getEntityCollection() {
        return this.entities;
    }

    /**
     * Sets the entity collection.
     *
     * @param entities  the entity collection (<code>null permitted).
     *
     * @see #getEntityCollection()
     */
    public void setEntityCollection(EntityCollection entities) {
        this.entities = entities;
    }

    /**
     * Clears the information recorded by this object.
     */
    public void clear() {
        this.chartArea.setRect(0.0, 0.0, 0.0, 0.0);
        this.plotInfo = new PlotRenderingInfo(this);
        if (this.entities != null) {
            this.entities.clear();
        }
    }

    /**
     * Returns the rendering info for the chart's plot.
     *
     * @return The rendering info for the plot.
     */
    public PlotRenderingInfo getPlotInfo() {
        return this.plotInfo;
    }

    /**
     * Tests this object for equality with an arbitrary object.
     *
     * @param obj  the object to test against (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof ChartRenderingInfo)) {
            return false;
        }
        ChartRenderingInfo that = (ChartRenderingInfo) obj;
        if (!ObjectUtilities.equal(this.chartArea, that.chartArea)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.plotInfo, that.plotInfo)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.entities, that.entities)) {
            return false;
        }
        return true;
    }

    /**
     * Returns a clone of this object.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException if the object cannot be cloned.
     */
    public Object clone() throws CloneNotSupportedException {
        ChartRenderingInfo clone = (ChartRenderingInfo) super.clone();
        if (this.chartArea != null) {
            clone.chartArea = (Rectangle2D) this.chartArea.clone();
        }
        if (this.entities instanceof PublicCloneable) {
            PublicCloneable pc = (PublicCloneable) this.entities;
            clone.entities = (EntityCollection) pc.clone();
        }
        return clone;
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the output stream.
     *
     * @throws IOException  if there is an I/O error.
     */
    private void writeObject(ObjectOutputStream stream) throws IOException {
        stream.defaultWriteObject();
        SerialUtilities.writeShape(this.chartArea, stream);
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the input stream.
     *
     * @throws IOException  if there is an I/O error.
     * @throws ClassNotFoundException  if there is a classpath problem.
     */
    private void readObject(ObjectInputStream stream)
        throws IOException, ClassNotFoundException {
        stream.defaultReadObject();
        this.chartArea = (Rectangle2D) SerialUtilities.readShape(stream);
    }

}

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