home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

jfreechart example source code file (Plot.java)

This example jfreechart source code file (Plot.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, event, eventlistenerlist, geometry, gradientpaint, gui, illegalargumentexception, illegalargumentexception, io, null, null, paint, paint, plot, plot, plotchangeevent, rectangle2d, rectangleedge, string, swing

The jfreechart Plot.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2009, 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.]
 *
 * ---------
 * Plot.java
 * ---------
 * (C) Copyright 2000-2009, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Sylvain Vieujot;
 *                   Jeremy Bowman;
 *                   Andreas Schneider;
 *                   Gideon Krause;
 *                   Nicolas Brodu;
 *                   Michal Krause;
 *                   Richard West, Advanced Micro Devices, Inc.;
 *                   Peter Kolb - patch 2603321;
 *
 * Changes
 * -------
 * 21-Jun-2001 : Removed redundant JFreeChart parameter from constructors (DG);
 * 18-Sep-2001 : Updated header info and fixed DOS encoding problem (DG);
 * 19-Oct-2001 : Moved series paint and stroke methods from JFreeChart
 *               class (DG);
 * 23-Oct-2001 : Created renderer for LinePlot class (DG);
 * 07-Nov-2001 : Changed type names for ChartChangeEvent (DG);
 *               Tidied up some Javadoc comments (DG);
 * 13-Nov-2001 : Changes to allow for null axes on plots such as PiePlot (DG);
 *               Added plot/axis compatibility checks (DG);
 * 12-Dec-2001 : Changed constructors to protected, and removed unnecessary
 *               'throws' clauses (DG);
 * 13-Dec-2001 : Added tooltips (DG);
 * 22-Jan-2002 : Added handleClick() method, as part of implementation for
 *               crosshairs (DG);
 *               Moved tooltips reference into ChartInfo class (DG);
 * 23-Jan-2002 : Added test for null axes in chartChanged() method, thanks
 *               to Barry Evans for the bug report (number 506979 on
 *               SourceForge) (DG);
 *               Added a zoom() method (DG);
 * 05-Feb-2002 : Updated setBackgroundPaint(), setOutlineStroke() and
 *               setOutlinePaint() to better handle null values, as suggested
 *               by Sylvain Vieujot (DG);
 * 06-Feb-2002 : Added background image, plus alpha transparency for background
 *               and foreground (DG);
 * 06-Mar-2002 : Added AxisConstants interface (DG);
 * 26-Mar-2002 : Changed zoom method from empty to abstract (DG);
 * 23-Apr-2002 : Moved dataset from JFreeChart class (DG);
 * 11-May-2002 : Added ShapeFactory interface for getShape() methods,
 *               contributed by Jeremy Bowman (DG);
 * 28-May-2002 : Fixed bug in setSeriesPaint(int, Paint) for subplots (AS);
 * 25-Jun-2002 : Removed redundant imports (DG);
 * 30-Jul-2002 : Added 'no data' message for charts with null or empty
 *               datasets (DG);
 * 21-Aug-2002 : Added code to extend series array if necessary (refer to
 *               SourceForge bug id 594547 for details) (DG);
 * 17-Sep-2002 : Fixed bug in getSeriesOutlineStroke() method, reported by
 *               Andreas Schroeder (DG);
 * 23-Sep-2002 : Added getLegendItems() abstract method (DG);
 * 24-Sep-2002 : Removed firstSeriesIndex, subplots now use their own paint
 *               settings, there is a new mechanism for the legend to collect
 *               the legend items (DG);
 * 27-Sep-2002 : Added dataset group (DG);
 * 14-Oct-2002 : Moved listener storage into EventListenerList.  Changed some
 *               abstract methods to empty implementations (DG);
 * 28-Oct-2002 : Added a getBackgroundImage() method (DG);
 * 21-Nov-2002 : Added a plot index for identifying subplots in combined and
 *               overlaid charts (DG);
 * 22-Nov-2002 : Changed all attributes from 'protected' to 'private'.  Added
 *               dataAreaRatio attribute from David M O'Donnell's code (DG);
 * 09-Jan-2003 : Integrated fix for plot border contributed by Gideon
 *               Krause (DG);
 * 17-Jan-2003 : Moved to com.jrefinery.chart.plot (DG);
 * 23-Jan-2003 : Removed one constructor (DG);
 * 26-Mar-2003 : Implemented Serializable (DG);
 * 14-Jul-2003 : Moved the dataset and secondaryDataset attributes to the
 *               CategoryPlot and XYPlot classes (DG);
 * 21-Jul-2003 : Moved DrawingSupplier from CategoryPlot and XYPlot up to this
 *               class (DG);
 * 20-Aug-2003 : Implemented Cloneable (DG);
 * 11-Sep-2003 : Listeners and clone (NB);
 * 29-Oct-2003 : Added workaround for font alignment in PDF output (DG);
 * 03-Dec-2003 : Modified draw method to accept anchor (DG);
 * 12-Mar-2004 : Fixed clipping bug in drawNoDataMessage() method (DG);
 * 07-Apr-2004 : Modified string bounds calculation (DG);
 * 04-Nov-2004 : Added default shapes for legend items (DG);
 * 25-Nov-2004 : Some changes to the clone() method implementation (DG);
 * 23-Feb-2005 : Implemented new LegendItemSource interface (and also
 *               PublicCloneable) (DG);
 * 21-Apr-2005 : Replaced Insets with RectangleInsets (DG);
 * 05-May-2005 : Removed unused draw() method (DG);
 * 06-Jun-2005 : Fixed bugs in equals() method (DG);
 * 01-Sep-2005 : Moved dataAreaRatio from here to ContourPlot (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 30-Jun-2006 : Added background image alpha - see bug report 1514904 (DG);
 * 05-Sep-2006 : Implemented the MarkerChangeListener interface (DG);
 * 11-Jan-2007 : Added some argument checks, event notifications, and many
 *               API doc updates (DG);
 * 03-Apr-2007 : Made drawBackgroundImage() public (DG);
 * 07-Jun-2007 : Added new fillBackground() method to handle GradientPaint
 *               taking into account orientation (DG);
 * 25-Mar-2008 : Added fireChangeEvent() method - see patch 1914411 (DG);
 * 15-Aug-2008 : Added setDrawingSupplier() method with notify flag (DG);
 * 13-Jan-2009 : Added notify flag (DG);
 * 19-Mar-2009 : Added entity support - see patch 2603321 by Peter Kolb (DG);
 *
 */

package org.jfree.chart.plot;

import java.awt.AlphaComposite;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Composite;
import java.awt.Font;
import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

import javax.swing.event.EventListenerList;

import org.jfree.chart.JFreeChart;
import org.jfree.chart.LegendItemCollection;
import org.jfree.chart.LegendItemSource;
import org.jfree.chart.axis.AxisLocation;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.entity.PlotEntity;
import org.jfree.chart.event.AxisChangeEvent;
import org.jfree.chart.event.AxisChangeListener;
import org.jfree.chart.event.ChartChangeEventType;
import org.jfree.chart.event.MarkerChangeEvent;
import org.jfree.chart.event.MarkerChangeListener;
import org.jfree.chart.event.PlotChangeEvent;
import org.jfree.chart.event.PlotChangeListener;
import org.jfree.data.general.DatasetChangeEvent;
import org.jfree.data.general.DatasetChangeListener;
import org.jfree.data.general.DatasetGroup;
import org.jfree.io.SerialUtilities;
import org.jfree.text.G2TextMeasurer;
import org.jfree.text.TextBlock;
import org.jfree.text.TextBlockAnchor;
import org.jfree.text.TextUtilities;
import org.jfree.ui.Align;
import org.jfree.ui.RectangleEdge;
import org.jfree.ui.RectangleInsets;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PaintUtilities;
import org.jfree.util.PublicCloneable;

/**
 * The base class for all plots in JFreeChart.  The {@link JFreeChart} class
 * delegates the drawing of axes and data to the plot.  This base class
 * provides facilities common to most plot types.
 */
public abstract class Plot implements AxisChangeListener,
        DatasetChangeListener, MarkerChangeListener, LegendItemSource,
        PublicCloneable, Cloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -8831571430103671324L;

    /** Useful constant representing zero. */
    public static final Number ZERO = new Integer(0);

    /** The default insets. */
    public static final RectangleInsets DEFAULT_INSETS
            = new RectangleInsets(4.0, 8.0, 4.0, 8.0);

    /** The default outline stroke. */
    public static final Stroke DEFAULT_OUTLINE_STROKE = new BasicStroke(0.5f);

    /** The default outline color. */
    public static final Paint DEFAULT_OUTLINE_PAINT = Color.gray;

    /** The default foreground alpha transparency. */
    public static final float DEFAULT_FOREGROUND_ALPHA = 1.0f;

    /** The default background alpha transparency. */
    public static final float DEFAULT_BACKGROUND_ALPHA = 1.0f;

    /** The default background color. */
    public static final Paint DEFAULT_BACKGROUND_PAINT = Color.white;

    /** The minimum width at which the plot should be drawn. */
    public static final int MINIMUM_WIDTH_TO_DRAW = 10;

    /** The minimum height at which the plot should be drawn. */
    public static final int MINIMUM_HEIGHT_TO_DRAW = 10;

    /** A default box shape for legend items. */
    public static final Shape DEFAULT_LEGEND_ITEM_BOX
            = new Rectangle2D.Double(-4.0, -4.0, 8.0, 8.0);

    /** A default circle shape for legend items. */
    public static final Shape DEFAULT_LEGEND_ITEM_CIRCLE
            = new Ellipse2D.Double(-4.0, -4.0, 8.0, 8.0);

    /** The parent plot (<code>null if this is the root plot). */
    private Plot parent;

    /** The dataset group (to be used for thread synchronisation). */
    private DatasetGroup datasetGroup;

    /** The message to display if no data is available. */
    private String noDataMessage;

    /** The font used to display the 'no data' message. */
    private Font noDataMessageFont;

    /** The paint used to draw the 'no data' message. */
    private transient Paint noDataMessagePaint;

    /** Amount of blank space around the plot area. */
    private RectangleInsets insets;

    /**
     * A flag that controls whether or not the plot outline is drawn.
     *
     * @since 1.0.6
     */
    private boolean outlineVisible;

    /** The Stroke used to draw an outline around the plot. */
    private transient Stroke outlineStroke;

    /** The Paint used to draw an outline around the plot. */
    private transient Paint outlinePaint;

    /** An optional color used to fill the plot background. */
    private transient Paint backgroundPaint;

    /** An optional image for the plot background. */
    private transient Image backgroundImage;  // not currently serialized

    /** The alignment for the background image. */
    private int backgroundImageAlignment = Align.FIT;

    /** The alpha value used to draw the background image. */
    private float backgroundImageAlpha = 0.5f;

    /** The alpha-transparency for the plot. */
    private float foregroundAlpha;

    /** The alpha transparency for the background paint. */
    private float backgroundAlpha;

    /** The drawing supplier. */
    private DrawingSupplier drawingSupplier;

    /** Storage for registered change listeners. */
    private transient EventListenerList listenerList;

    /**
     * A flag that controls whether or not the plot will notify listeners
     * of changes (defaults to true, but sometimes it is useful to disable
     * this).
     *
     * @since 1.0.13
     */
    private boolean notify;

    /**
     * Creates a new plot.
     */
    protected Plot() {

        this.parent = null;
        this.insets = DEFAULT_INSETS;
        this.backgroundPaint = DEFAULT_BACKGROUND_PAINT;
        this.backgroundAlpha = DEFAULT_BACKGROUND_ALPHA;
        this.backgroundImage = null;
        this.outlineVisible = true;
        this.outlineStroke = DEFAULT_OUTLINE_STROKE;
        this.outlinePaint = DEFAULT_OUTLINE_PAINT;
        this.foregroundAlpha = DEFAULT_FOREGROUND_ALPHA;

        this.noDataMessage = null;
        this.noDataMessageFont = new Font("SansSerif", Font.PLAIN, 12);
        this.noDataMessagePaint = Color.black;

        this.drawingSupplier = new DefaultDrawingSupplier();

        this.notify = true;
        this.listenerList = new EventListenerList();

    }

    /**
     * Returns the dataset group for the plot (not currently used).
     *
     * @return The dataset group.
     *
     * @see #setDatasetGroup(DatasetGroup)
     */
    public DatasetGroup getDatasetGroup() {
        return this.datasetGroup;
    }

    /**
     * Sets the dataset group (not currently used).
     *
     * @param group  the dataset group (<code>null permitted).
     *
     * @see #getDatasetGroup()
     */
    protected void setDatasetGroup(DatasetGroup group) {
        this.datasetGroup = group;
    }

    /**
     * Returns the string that is displayed when the dataset is empty or
     * <code>null.
     *
     * @return The 'no data' message (<code>null possible).
     *
     * @see #setNoDataMessage(String)
     * @see #getNoDataMessageFont()
     * @see #getNoDataMessagePaint()
     */
    public String getNoDataMessage() {
        return this.noDataMessage;
    }

    /**
     * Sets the message that is displayed when the dataset is empty or
     * <code>null, and sends a {@link PlotChangeEvent} to all registered
     * listeners.
     *
     * @param message  the message (<code>null permitted).
     *
     * @see #getNoDataMessage()
     */
    public void setNoDataMessage(String message) {
        this.noDataMessage = message;
        fireChangeEvent();
    }

    /**
     * Returns the font used to display the 'no data' message.
     *
     * @return The font (never <code>null).
     *
     * @see #setNoDataMessageFont(Font)
     * @see #getNoDataMessage()
     */
    public Font getNoDataMessageFont() {
        return this.noDataMessageFont;
    }

    /**
     * Sets the font used to display the 'no data' message and sends a
     * {@link PlotChangeEvent} to all registered listeners.
     *
     * @param font  the font (<code>null not permitted).
     *
     * @see #getNoDataMessageFont()
     */
    public void setNoDataMessageFont(Font font) {
        if (font == null) {
            throw new IllegalArgumentException("Null 'font' argument.");
        }
        this.noDataMessageFont = font;
        fireChangeEvent();
    }

    /**
     * Returns the paint used to display the 'no data' message.
     *
     * @return The paint (never <code>null).
     *
     * @see #setNoDataMessagePaint(Paint)
     * @see #getNoDataMessage()
     */
    public Paint getNoDataMessagePaint() {
        return this.noDataMessagePaint;
    }

    /**
     * Sets the paint used to display the 'no data' message and sends a
     * {@link PlotChangeEvent} to all registered listeners.
     *
     * @param paint  the paint (<code>null not permitted).
     *
     * @see #getNoDataMessagePaint()
     */
    public void setNoDataMessagePaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");
        }
        this.noDataMessagePaint = paint;
        fireChangeEvent();
    }

    /**
     * Returns a short string describing the plot type.
     * <P>
     * Note: this gets used in the chart property editing user interface,
     * but there needs to be a better mechanism for identifying the plot type.
     *
     * @return A short string describing the plot type (never
     *     <code>null).
     */
    public abstract String getPlotType();

    /**
     * Returns the parent plot (or <code>null if this plot is not part
     * of a combined plot).
     *
     * @return The parent plot.
     *
     * @see #setParent(Plot)
     * @see #getRootPlot()
     */
    public Plot getParent() {
        return this.parent;
    }

    /**
     * Sets the parent plot.  This method is intended for internal use, you
     * shouldn't need to call it directly.
     *
     * @param parent  the parent plot (<code>null permitted).
     *
     * @see #getParent()
     */
    public void setParent(Plot parent) {
        this.parent = parent;
    }

    /**
     * Returns the root plot.
     *
     * @return The root plot.
     *
     * @see #getParent()
     */
    public Plot getRootPlot() {

        Plot p = getParent();
        if (p == null) {
            return this;
        }
        else {
            return p.getRootPlot();
        }

    }

    /**
     * Returns <code>true if this plot is part of a combined plot
     * structure (that is, {@link #getParent()} returns a non-<code>null
     * value), and <code>false otherwise.
     *
     * @return <code>true if this plot is part of a combined plot
     *         structure.
     *
     * @see #getParent()
     */
    public boolean isSubplot() {
        return (getParent() != null);
    }

    /**
     * Returns the insets for the plot area.
     *
     * @return The insets (never <code>null).
     *
     * @see #setInsets(RectangleInsets)
     */
    public RectangleInsets getInsets() {
        return this.insets;
    }

    /**
     * Sets the insets for the plot and sends a {@link PlotChangeEvent} to
     * all registered listeners.
     *
     * @param insets  the new insets (<code>null not permitted).
     *
     * @see #getInsets()
     * @see #setInsets(RectangleInsets, boolean)
     */
    public void setInsets(RectangleInsets insets) {
        setInsets(insets, true);
    }

    /**
     * Sets the insets for the plot and, if requested,  and sends a
     * {@link PlotChangeEvent} to all registered listeners.
     *
     * @param insets  the new insets (<code>null not permitted).
     * @param notify  a flag that controls whether the registered listeners are
     *                notified.
     *
     * @see #getInsets()
     * @see #setInsets(RectangleInsets)
     */
    public void setInsets(RectangleInsets insets, boolean notify) {
        if (insets == null) {
            throw new IllegalArgumentException("Null 'insets' argument.");
        }
        if (!this.insets.equals(insets)) {
            this.insets = insets;
            if (notify) {
                fireChangeEvent();
            }
        }

    }

    /**
     * Returns the background color of the plot area.
     *
     * @return The paint (possibly <code>null).
     *
     * @see #setBackgroundPaint(Paint)
     */
    public Paint getBackgroundPaint() {
        return this.backgroundPaint;
    }

    /**
     * Sets the background color of the plot area and sends a
     * {@link PlotChangeEvent} to all registered listeners.
     *
     * @param paint  the paint (<code>null permitted).
     *
     * @see #getBackgroundPaint()
     */
    public void setBackgroundPaint(Paint paint) {

        if (paint == null) {
            if (this.backgroundPaint != null) {
                this.backgroundPaint = null;
                fireChangeEvent();
            }
        }
        else {
            if (this.backgroundPaint != null) {
                if (this.backgroundPaint.equals(paint)) {
                    return;  // nothing to do
                }
            }
            this.backgroundPaint = paint;
            fireChangeEvent();
        }

    }

    /**
     * Returns the alpha transparency of the plot area background.
     *
     * @return The alpha transparency.
     *
     * @see #setBackgroundAlpha(float)
     */
    public float getBackgroundAlpha() {
        return this.backgroundAlpha;
    }

    /**
     * Sets the alpha transparency of the plot area background, and notifies
     * registered listeners that the plot has been modified.
     *
     * @param alpha the new alpha value (in the range 0.0f to 1.0f).
     *
     * @see #getBackgroundAlpha()
     */
    public void setBackgroundAlpha(float alpha) {
        if (this.backgroundAlpha != alpha) {
            this.backgroundAlpha = alpha;
            fireChangeEvent();
        }
    }

    /**
     * Returns the drawing supplier for the plot.
     *
     * @return The drawing supplier (possibly <code>null).
     *
     * @see #setDrawingSupplier(DrawingSupplier)
     */
    public DrawingSupplier getDrawingSupplier() {
        DrawingSupplier result = null;
        Plot p = getParent();
        if (p != null) {
            result = p.getDrawingSupplier();
        }
        else {
            result = this.drawingSupplier;
        }
        return result;
    }

    /**
     * Sets the drawing supplier for the plot and sends a
     * {@link PlotChangeEvent} to all registered listeners.  The drawing
     * supplier is responsible for supplying a limitless (possibly repeating)
     * sequence of <code>Paint, Stroke and
     * <code>Shape objects that the plot's renderer(s) can use to
     * populate its (their) tables.
     *
     * @param supplier  the new supplier.
     *
     * @see #getDrawingSupplier()
     */
    public void setDrawingSupplier(DrawingSupplier supplier) {
        this.drawingSupplier = supplier;
        fireChangeEvent();
    }

    /**
     * Sets the drawing supplier for the plot and, if requested, sends a
     * {@link PlotChangeEvent} to all registered listeners.  The drawing
     * supplier is responsible for supplying a limitless (possibly repeating)
     * sequence of <code>Paint, Stroke and
     * <code>Shape objects that the plot's renderer(s) can use to
     * populate its (their) tables.
     *
     * @param supplier  the new supplier.
     * @param notify  notify listeners?
     *
     * @see #getDrawingSupplier()
     *
     * @since 1.0.11
     */
    public void setDrawingSupplier(DrawingSupplier supplier, boolean notify) {
        this.drawingSupplier = supplier;
        if (notify) {
            fireChangeEvent();
        }
    }

    /**
     * Returns the background image that is used to fill the plot's background
     * area.
     *
     * @return The image (possibly <code>null).
     *
     * @see #setBackgroundImage(Image)
     */
    public Image getBackgroundImage() {
        return this.backgroundImage;
    }

    /**
     * Sets the background image for the plot and sends a
     * {@link PlotChangeEvent} to all registered listeners.
     *
     * @param image  the image (<code>null permitted).
     *
     * @see #getBackgroundImage()
     */
    public void setBackgroundImage(Image image) {
        this.backgroundImage = image;
        fireChangeEvent();
    }

    /**
     * Returns the background image alignment. Alignment constants are defined
     * in the <code>org.jfree.ui.Align class in the JCommon class
     * library.
     *
     * @return The alignment.
     *
     * @see #setBackgroundImageAlignment(int)
     */
    public int getBackgroundImageAlignment() {
        return this.backgroundImageAlignment;
    }

    /**
     * Sets the alignment for the background image and sends a
     * {@link PlotChangeEvent} to all registered listeners.  Alignment options
     * are defined by the {@link org.jfree.ui.Align} class in the JCommon
     * class library.
     *
     * @param alignment  the alignment.
     *
     * @see #getBackgroundImageAlignment()
     */
    public void setBackgroundImageAlignment(int alignment) {
        if (this.backgroundImageAlignment != alignment) {
            this.backgroundImageAlignment = alignment;
            fireChangeEvent();
        }
    }

    /**
     * Returns the alpha transparency used to draw the background image.  This
     * is a value in the range 0.0f to 1.0f, where 0.0f is fully transparent
     * and 1.0f is fully opaque.
     *
     * @return The alpha transparency.
     *
     * @see #setBackgroundImageAlpha(float)
     */
    public float getBackgroundImageAlpha() {
        return this.backgroundImageAlpha;
    }

    /**
     * Sets the alpha transparency used when drawing the background image.
     *
     * @param alpha  the alpha transparency (in the range 0.0f to 1.0f, where
     *     0.0f is fully transparent, and 1.0f is fully opaque).
     *
     * @throws IllegalArgumentException if <code>alpha is not within
     *     the specified range.
     *
     * @see #getBackgroundImageAlpha()
     */
    public void setBackgroundImageAlpha(float alpha) {
        if (alpha < 0.0f || alpha > 1.0f)
            throw new IllegalArgumentException(
                    "The 'alpha' value must be in the range 0.0f to 1.0f.");
        if (this.backgroundImageAlpha != alpha) {
            this.backgroundImageAlpha = alpha;
            fireChangeEvent();
        }
    }

    /**
     * Returns the flag that controls whether or not the plot outline is
     * drawn.  The default value is <code>true.  Note that for
     * historical reasons, the plot's outline paint and stroke can take on
     * <code>null values, in which case the outline will not be drawn
     * even if this flag is set to <code>true.
     *
     * @return The outline visibility flag.
     *
     * @since 1.0.6
     *
     * @see #setOutlineVisible(boolean)
     */
    public boolean isOutlineVisible() {
        return this.outlineVisible;
    }

    /**
     * Sets the flag that controls whether or not the plot's outline is
     * drawn, and sends a {@link PlotChangeEvent} to all registered listeners.
     *
     * @param visible  the new flag value.
     *
     * @since 1.0.6
     *
     * @see #isOutlineVisible()
     */
    public void setOutlineVisible(boolean visible) {
        this.outlineVisible = visible;
        fireChangeEvent();
    }

    /**
     * Returns the stroke used to outline the plot area.
     *
     * @return The stroke (possibly <code>null).
     *
     * @see #setOutlineStroke(Stroke)
     */
    public Stroke getOutlineStroke() {
        return this.outlineStroke;
    }

    /**
     * Sets the stroke used to outline the plot area and sends a
     * {@link PlotChangeEvent} to all registered listeners. If you set this
     * attribute to <code>null, no outline will be drawn.
     *
     * @param stroke  the stroke (<code>null permitted).
     *
     * @see #getOutlineStroke()
     */
    public void setOutlineStroke(Stroke stroke) {
        if (stroke == null) {
            if (this.outlineStroke != null) {
                this.outlineStroke = null;
                fireChangeEvent();
            }
        }
        else {
            if (this.outlineStroke != null) {
                if (this.outlineStroke.equals(stroke)) {
                    return;  // nothing to do
                }
            }
            this.outlineStroke = stroke;
            fireChangeEvent();
        }
    }

    /**
     * Returns the color used to draw the outline of the plot area.
     *
     * @return The color (possibly <code>null).
     *
     * @see #setOutlinePaint(Paint)
     */
    public Paint getOutlinePaint() {
        return this.outlinePaint;
    }

    /**
     * Sets the paint used to draw the outline of the plot area and sends a
     * {@link PlotChangeEvent} to all registered listeners.  If you set this
     * attribute to <code>null, no outline will be drawn.
     *
     * @param paint  the paint (<code>null permitted).
     *
     * @see #getOutlinePaint()
     */
    public void setOutlinePaint(Paint paint) {
        if (paint == null) {
            if (this.outlinePaint != null) {
                this.outlinePaint = null;
                fireChangeEvent();
            }
        }
        else {
            if (this.outlinePaint != null) {
                if (this.outlinePaint.equals(paint)) {
                    return;  // nothing to do
                }
            }
            this.outlinePaint = paint;
            fireChangeEvent();
        }
    }

    /**
     * Returns the alpha-transparency for the plot foreground.
     *
     * @return The alpha-transparency.
     *
     * @see #setForegroundAlpha(float)
     */
    public float getForegroundAlpha() {
        return this.foregroundAlpha;
    }

    /**
     * Sets the alpha-transparency for the plot and sends a
     * {@link PlotChangeEvent} to all registered listeners.
     *
     * @param alpha  the new alpha transparency.
     *
     * @see #getForegroundAlpha()
     */
    public void setForegroundAlpha(float alpha) {
        if (this.foregroundAlpha != alpha) {
            this.foregroundAlpha = alpha;
            fireChangeEvent();
        }
    }

    /**
     * Returns the legend items for the plot.  By default, this method returns
     * <code>null.  Subclasses should override to return a
     * {@link LegendItemCollection}.
     *
     * @return The legend items for the plot (possibly <code>null).
     */
    public LegendItemCollection getLegendItems() {
        return null;
    }

    /**
     * Returns a flag that controls whether or not change events are sent to
     * registered listeners.
     *
     * @return A boolean.
     *
     * @see #setNotify(boolean)
     *
     * @since 1.0.13
     */
    public boolean isNotify() {
        return this.notify;
    }

    /**
     * Sets a flag that controls whether or not listeners receive
     * {@link PlotChangeEvent} notifications.
     *
     * @param notify  a boolean.
     *
     * @see #isNotify()
     *
     * @since 1.0.13
     */
    public void setNotify(boolean notify) {
        this.notify = notify;
        // if the flag is being set to true, there may be queued up changes...
        if (notify) {
            notifyListeners(new PlotChangeEvent(this));
        }
    }

    /**
     * Registers an object for notification of changes to the plot.
     *
     * @param listener  the object to be registered.
     *
     * @see #removeChangeListener(PlotChangeListener)
     */
    public void addChangeListener(PlotChangeListener listener) {
        this.listenerList.add(PlotChangeListener.class, listener);
    }

    /**
     * Unregisters an object for notification of changes to the plot.
     *
     * @param listener  the object to be unregistered.
     *
     * @see #addChangeListener(PlotChangeListener)
     */
    public void removeChangeListener(PlotChangeListener listener) {
        this.listenerList.remove(PlotChangeListener.class, listener);
    }

    /**
     * Notifies all registered listeners that the plot has been modified.
     *
     * @param event  information about the change event.
     */
    public void notifyListeners(PlotChangeEvent event) {
        // if the 'notify' flag has been switched to false, we don't notify
        // the listeners
        if (!this.notify) {
            return;
        }
        Object[] listeners = this.listenerList.getListenerList();
        for (int i = listeners.length - 2; i >= 0; i -= 2) {
            if (listeners[i] == PlotChangeListener.class) {
                ((PlotChangeListener) listeners[i + 1]).plotChanged(event);
            }
        }
    }

    /**
     * Sends a {@link PlotChangeEvent} to all registered listeners.
     *
     * @since 1.0.10
     */
    protected void fireChangeEvent() {
        notifyListeners(new PlotChangeEvent(this));
    }

    /**
     * Draws the plot within the specified area.  The anchor is a point on the
     * chart that is specified externally (for instance, it may be the last
     * point of the last mouse click performed by the user) - plots can use or
     * ignore this value as they see fit.
     * <br>
* Subclasses need to provide an implementation of this method, obviously. * * @param g2 the graphics device. * @param area the plot area. * @param anchor the anchor point (<code>null permitted). * @param parentState the parent state (if any). * @param info carries back plot rendering info. */ public abstract void draw(Graphics2D g2, Rectangle2D area, Point2D anchor, PlotState parentState, PlotRenderingInfo info); /** * Draws the plot background (the background color and/or image). * <P> * This method will be called during the chart drawing process and is * declared public so that it can be accessed by the renderers used by * certain subclasses. You shouldn't need to call this method directly. * * @param g2 the graphics device. * @param area the area within which the plot should be drawn. */ public void drawBackground(Graphics2D g2, Rectangle2D area) { // some subclasses override this method completely, so don't put // anything here that *must* be done fillBackground(g2, area); drawBackgroundImage(g2, area); } /** * Fills the specified area with the background paint. * * @param g2 the graphics device. * @param area the area. * * @see #getBackgroundPaint() * @see #getBackgroundAlpha() * @see #fillBackground(Graphics2D, Rectangle2D, PlotOrientation) */ protected void fillBackground(Graphics2D g2, Rectangle2D area) { fillBackground(g2, area, PlotOrientation.VERTICAL); } /** * Fills the specified area with the background paint. If the background * paint is an instance of <code>GradientPaint, the gradient will * run in the direction suggested by the plot's orientation. * * @param g2 the graphics target. * @param area the plot area. * @param orientation the plot orientation (<code>null not * permitted). * * @since 1.0.6 */ protected void fillBackground(Graphics2D g2, Rectangle2D area, PlotOrientation orientation) { if (orientation == null) { throw new IllegalArgumentException("Null 'orientation' argument."); } if (this.backgroundPaint == null) { return; } Paint p = this.backgroundPaint; if (p instanceof GradientPaint) { GradientPaint gp = (GradientPaint) p; if (orientation == PlotOrientation.VERTICAL) { p = new GradientPaint((float) area.getCenterX(), (float) area.getMaxY(), gp.getColor1(), (float) area.getCenterX(), (float) area.getMinY(), gp.getColor2()); } else if (orientation == PlotOrientation.HORIZONTAL) { p = new GradientPaint((float) area.getMinX(), (float) area.getCenterY(), gp.getColor1(), (float) area.getMaxX(), (float) area.getCenterY(), gp.getColor2()); } } Composite originalComposite = g2.getComposite(); g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, this.backgroundAlpha)); g2.setPaint(p); g2.fill(area); g2.setComposite(originalComposite); } /** * Draws the background image (if there is one) aligned within the * specified area. * * @param g2 the graphics device. * @param area the area. * * @see #getBackgroundImage() * @see #getBackgroundImageAlignment() * @see #getBackgroundImageAlpha() */ public void drawBackgroundImage(Graphics2D g2, Rectangle2D area) { if (this.backgroundImage != null) { Composite originalComposite = g2.getComposite(); g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, this.backgroundImageAlpha)); Rectangle2D dest = new Rectangle2D.Double(0.0, 0.0, this.backgroundImage.getWidth(null), this.backgroundImage.getHeight(null)); Align.align(dest, area, this.backgroundImageAlignment); g2.drawImage(this.backgroundImage, (int) dest.getX(), (int) dest.getY(), (int) dest.getWidth() + 1, (int) dest.getHeight() + 1, null); g2.setComposite(originalComposite); } } /** * Draws the plot outline. This method will be called during the chart * drawing process and is declared public so that it can be accessed by the * renderers used by certain subclasses. You shouldn't need to call this * method directly. * * @param g2 the graphics device. * @param area the area within which the plot should be drawn. */ public void drawOutline(Graphics2D g2, Rectangle2D area) { if (!this.outlineVisible) { return; } if ((this.outlineStroke != null) && (this.outlinePaint != null)) { g2.setStroke(this.outlineStroke); g2.setPaint(this.outlinePaint); g2.draw(area); } } /** * Draws a message to state that there is no data to plot. * * @param g2 the graphics device. * @param area the area within which the plot should be drawn. */ protected void drawNoDataMessage(Graphics2D g2, Rectangle2D area) { Shape savedClip = g2.getClip(); g2.clip(area); String message = this.noDataMessage; if (message != null) { g2.setFont(this.noDataMessageFont); g2.setPaint(this.noDataMessagePaint); TextBlock block = TextUtilities.createTextBlock( this.noDataMessage, this.noDataMessageFont, this.noDataMessagePaint, 0.9f * (float) area.getWidth(), new G2TextMeasurer(g2)); block.draw(g2, (float) area.getCenterX(), (float) area.getCenterY(), TextBlockAnchor.CENTER); } g2.setClip(savedClip); } /** * Creates a plot entity that contains a reference to the plot and the * data area as shape. * * @param dataArea the data area used as hot spot for the entity. * @param plotState the plot rendering info containing a reference to the * EntityCollection. * @param toolTip the tool tip (defined in the respective Plot * subclass) (<code>null permitted). * @param urlText the url (defined in the respective Plot subclass) * (<code>null permitted). * * @since 1.0.13 */ protected void createAndAddEntity(Rectangle2D dataArea, PlotRenderingInfo plotState, String toolTip, String urlText){ if (plotState != null && plotState.getOwner() != null) { EntityCollection e = plotState.getOwner().getEntityCollection(); if (e != null) { e.add(new PlotEntity(dataArea, this, toolTip, urlText)); } } } /** * Handles a 'click' on the plot. Since the plot does not maintain any * information about where it has been drawn, the plot rendering info is * supplied as an argument so that the plot dimensions can be determined. * * @param x the x coordinate (in Java2D space). * @param y the y coordinate (in Java2D space). * @param info an object containing information about the dimensions of * the plot. */ public void handleClick(int x, int y, PlotRenderingInfo info) { // provides a 'no action' default } /** * Performs a zoom on the plot. Subclasses should override if zooming is * appropriate for the type of plot. * * @param percent the zoom percentage. */ public void zoom(double percent) { // do nothing by default. } /** * Receives notification of a change to one of the plot's axes. * * @param event information about the event (not used here). */ public void axisChanged(AxisChangeEvent event) { fireChangeEvent(); } /** * Receives notification of a change to the plot's dataset. * <P> * The plot reacts by passing on a plot change event to all registered * listeners. * * @param event information about the event (not used here). */ public void datasetChanged(DatasetChangeEvent event) { PlotChangeEvent newEvent = new PlotChangeEvent(this); newEvent.setType(ChartChangeEventType.DATASET_UPDATED); notifyListeners(newEvent); } /** * Receives notification of a change to a marker that is assigned to the * plot. * * @param event the event. * * @since 1.0.3 */ public void markerChanged(MarkerChangeEvent event) { fireChangeEvent(); } /** * Adjusts the supplied x-value. * * @param x the x-value. * @param w1 width 1. * @param w2 width 2. * @param edge the edge (left or right). * * @return The adjusted x-value. */ protected double getRectX(double x, double w1, double w2, RectangleEdge edge) { double result = x; if (edge == RectangleEdge.LEFT) { result = result + w1; } else if (edge == RectangleEdge.RIGHT) { result = result + w2; } return result; } /** * Adjusts the supplied y-value. * * @param y the x-value. * @param h1 height 1. * @param h2 height 2. * @param edge the edge (top or bottom). * * @return The adjusted y-value. */ protected double getRectY(double y, double h1, double h2, RectangleEdge edge) { double result = y; if (edge == RectangleEdge.TOP) { result = result + h1; } else if (edge == RectangleEdge.BOTTOM) { result = result + h2; } return result; } /** * Tests this plot for equality with another object. * * @param obj the object (<code>null permitted). * * @return <code>true or false. */ public boolean equals(Object obj) { if (obj == this) { return true; } if (!(obj instanceof Plot)) { return false; } Plot that = (Plot) obj; if (!ObjectUtilities.equal(this.noDataMessage, that.noDataMessage)) { return false; } if (!ObjectUtilities.equal( this.noDataMessageFont, that.noDataMessageFont )) { return false; } if (!PaintUtilities.equal(this.noDataMessagePaint, that.noDataMessagePaint)) { return false; } if (!ObjectUtilities.equal(this.insets, that.insets)) { return false; } if (this.outlineVisible != that.outlineVisible) { return false; } if (!ObjectUtilities.equal(this.outlineStroke, that.outlineStroke)) { return false; } if (!PaintUtilities.equal(this.outlinePaint, that.outlinePaint)) { return false; } if (!PaintUtilities.equal(this.backgroundPaint, that.backgroundPaint)) { return false; } if (!ObjectUtilities.equal(this.backgroundImage, that.backgroundImage)) { return false; } if (this.backgroundImageAlignment != that.backgroundImageAlignment) { return false; } if (this.backgroundImageAlpha != that.backgroundImageAlpha) { return false; } if (this.foregroundAlpha != that.foregroundAlpha) { return false; } if (this.backgroundAlpha != that.backgroundAlpha) { return false; } if (!this.drawingSupplier.equals(that.drawingSupplier)) { return false; } if (this.notify != that.notify) { return false; } return true; } /** * Creates a clone of the plot. * * @return A clone. * * @throws CloneNotSupportedException if some component of the plot does not * support cloning. */ public Object clone() throws CloneNotSupportedException { Plot clone = (Plot) super.clone(); // private Plot parent <-- don't clone the parent plot, but take care // childs in combined plots instead if (this.datasetGroup != null) { clone.datasetGroup = (DatasetGroup) ObjectUtilities.clone(this.datasetGroup); } clone.drawingSupplier = (DrawingSupplier) ObjectUtilities.clone(this.drawingSupplier); clone.listenerList = new EventListenerList(); 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.writePaint(this.noDataMessagePaint, stream); SerialUtilities.writeStroke(this.outlineStroke, stream); SerialUtilities.writePaint(this.outlinePaint, stream); // backgroundImage SerialUtilities.writePaint(this.backgroundPaint, 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.noDataMessagePaint = SerialUtilities.readPaint(stream); this.outlineStroke = SerialUtilities.readStroke(stream); this.outlinePaint = SerialUtilities.readPaint(stream); // backgroundImage this.backgroundPaint = SerialUtilities.readPaint(stream); this.listenerList = new EventListenerList(); } /** * Resolves a domain axis location for a given plot orientation. * * @param location the location (<code>null not permitted). * @param orientation the orientation (<code>null not permitted). * * @return The edge (never <code>null). */ public static RectangleEdge resolveDomainAxisLocation( AxisLocation location, PlotOrientation orientation) { if (location == null) { throw new IllegalArgumentException("Null 'location' argument."); } if (orientation == null) { throw new IllegalArgumentException("Null 'orientation' argument."); } RectangleEdge result = null; if (location == AxisLocation.TOP_OR_RIGHT) { if (orientation == PlotOrientation.HORIZONTAL) { result = RectangleEdge.RIGHT; } else if (orientation == PlotOrientation.VERTICAL) { result = RectangleEdge.TOP; } } else if (location == AxisLocation.TOP_OR_LEFT) { if (orientation == PlotOrientation.HORIZONTAL) { result = RectangleEdge.LEFT; } else if (orientation == PlotOrientation.VERTICAL) { result = RectangleEdge.TOP; } } else if (location == AxisLocation.BOTTOM_OR_RIGHT) { if (orientation == PlotOrientation.HORIZONTAL) { result = RectangleEdge.RIGHT; } else if (orientation == PlotOrientation.VERTICAL) { result = RectangleEdge.BOTTOM; } } else if (location == AxisLocation.BOTTOM_OR_LEFT) { if (orientation == PlotOrientation.HORIZONTAL) { result = RectangleEdge.LEFT; } else if (orientation == PlotOrientation.VERTICAL) { result = RectangleEdge.BOTTOM; } } // the above should cover all the options... if (result == null) { throw new IllegalStateException("resolveDomainAxisLocation()"); } return result; } /** * Resolves a range axis location for a given plot orientation. * * @param location the location (<code>null not permitted). * @param orientation the orientation (<code>null not permitted). * * @return The edge (never <code>null). */ public static RectangleEdge resolveRangeAxisLocation( AxisLocation location, PlotOrientation orientation) { if (location == null) { throw new IllegalArgumentException("Null 'location' argument."); } if (orientation == null) { throw new IllegalArgumentException("Null 'orientation' argument."); } RectangleEdge result = null; if (location == AxisLocation.TOP_OR_RIGHT) { if (orientation == PlotOrientation.HORIZONTAL) { result = RectangleEdge.TOP; } else if (orientation == PlotOrientation.VERTICAL) { result = RectangleEdge.RIGHT; } } else if (location == AxisLocation.TOP_OR_LEFT) { if (orientation == PlotOrientation.HORIZONTAL) { result = RectangleEdge.TOP; } else if (orientation == PlotOrientation.VERTICAL) { result = RectangleEdge.LEFT; } } else if (location == AxisLocation.BOTTOM_OR_RIGHT) { if (orientation == PlotOrientation.HORIZONTAL) { result = RectangleEdge.BOTTOM; } else if (orientation == PlotOrientation.VERTICAL) { result = RectangleEdge.RIGHT; } } else if (location == AxisLocation.BOTTOM_OR_LEFT) { if (orientation == PlotOrientation.HORIZONTAL) { result = RectangleEdge.BOTTOM; } else if (orientation == PlotOrientation.VERTICAL) { result = RectangleEdge.LEFT; } } // the above should cover all the options... if (result == null) { throw new IllegalStateException("resolveRangeAxisLocation()"); } return result; } }

Other jfreechart examples (source code examples)

Here is a short list of links related to this jfreechart Plot.java source code file:



my book on functional programming

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.