    001    /* ===========================================================
    002     * JFreeChart : a free chart library for the Java(tm) platform
    003     * ===========================================================
    004     *
    005     * (C) Copyright 2000-2011, by Object Refinery Limited and Contributors.
    006     *
    007     * Project Info:  http://www.jfree.org/jfreechart/index.html
    008     *
    009     * This library is free software; you can redistribute it and/or modify it
    010     * under the terms of the GNU Lesser General Public License as published by
    011     * the Free Software Foundation; either version 2.1 of the License, or
    012     * (at your option) any later version.
    013     *
    014     * This library is distributed in the hope that it will be useful, but
    015     * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    016     * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
    017     * License for more details.
    018     *
    019     * You should have received a copy of the GNU Lesser General Public
    020     * License along with this library; if not, write to the Free Software
    021     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
    022     * USA.
    023     *
    024     * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
    025     * Other names may be trademarks of their respective owners.]
    026     *
    027     * ----------------
    028     * LegendTitle.java
    029     * ----------------
    030     * (C) Copyright 2002-2009, by Object Refinery Limited.
    031     *
    032     * Original Author:  David Gilbert (for Object Refinery Limited);
    033     * Contributor(s):   Pierre-Marie Le Biot;
    034     *
    035     * Changes
    036     * -------
    037     * 25-Nov-2004 : First working version (DG);
    038     * 11-Jan-2005 : Removed deprecated code in preparation for 1.0.0 release (DG);
    039     * 08-Feb-2005 : Updated for changes in RectangleConstraint class (DG);
    040     * 11-Feb-2005 : Implemented PublicCloneable (DG);
    041     * 23-Feb-2005 : Replaced chart reference with LegendItemSource (DG);
    042     * 16-Mar-2005 : Added itemFont attribute (DG);
    043     * 17-Mar-2005 : Fixed missing fillShape setting (DG);
    044     * 20-Apr-2005 : Added new draw() method (DG);
    045     * 03-May-2005 : Modified equals() method to ignore sources (DG);
    046     * 13-May-2005 : Added settings for legend item label and graphic padding (DG);
    047     * 09-Jun-2005 : Fixed serialization bug (DG);
    048     * 01-Sep-2005 : Added itemPaint attribute (PMLB);
    049     * ------------- JFREECHART 1.0.x ---------------------------------------------
    050     * 20-Jul-2006 : Use new LegendItemBlockContainer to restore support for
    051     *               LegendItemEntities (DG);
    052     * 06-Oct-2006 : Add tooltip and URL text to legend item (DG);
    053     * 13-Dec-2006 : Added support for GradientPaint in legend items (DG);
    054     * 16-Mar-2007 : Updated border drawing for changes in AbstractBlock (DG);
    055     * 18-May-2007 : Pass seriesKey and dataset to legend item block (DG);
    056     * 15-Aug-2008 : Added getWrapper() method (DG);
    057     * 19-Mar-2009 : Added entity support - see patch 2603321 by Peter Kolb (DG);
    058     *
    059     */
    060
    061    package org.jfree.chart.title;
    062
    063    import java.awt.Color;
    064    import java.awt.Font;
    065    import java.awt.Graphics2D;
    066    import java.awt.Paint;
    067    import java.awt.geom.Rectangle2D;
    068    import java.io.IOException;
    069    import java.io.ObjectInputStream;
    070    import java.io.ObjectOutputStream;
    071    import java.io.Serializable;
    072
    073    import org.jfree.chart.LegendItem;
    074    import org.jfree.chart.LegendItemCollection;
    075    import org.jfree.chart.LegendItemSource;
    076    import org.jfree.chart.block.Arrangement;
    077    import org.jfree.chart.block.Block;
    078    import org.jfree.chart.block.BlockContainer;
    079    import org.jfree.chart.block.BlockFrame;
    080    import org.jfree.chart.block.BlockResult;
    081    import org.jfree.chart.block.BorderArrangement;
    082    import org.jfree.chart.block.CenterArrangement;
    083    import org.jfree.chart.block.ColumnArrangement;
    084    import org.jfree.chart.block.EntityBlockParams;
    085    import org.jfree.chart.block.FlowArrangement;
    086    import org.jfree.chart.block.LabelBlock;
    087    import org.jfree.chart.block.RectangleConstraint;
    088    import org.jfree.chart.entity.EntityCollection;
    089    import org.jfree.chart.entity.StandardEntityCollection;
    090    import org.jfree.chart.entity.TitleEntity;
    091    import org.jfree.chart.event.TitleChangeEvent;
    092    import org.jfree.io.SerialUtilities;
    093    import org.jfree.ui.RectangleAnchor;
    094    import org.jfree.ui.RectangleEdge;
    095    import org.jfree.ui.RectangleInsets;
    096    import org.jfree.ui.Size2D;
    097    import org.jfree.util.PaintUtilities;
    098    import org.jfree.util.PublicCloneable;
    099
    100    /**
    101     * A chart title that displays a legend for the data in the chart.
    102     * <P>
    103     * The title can be populated with legend items manually, or you can assign a
    104     * reference to the plot, in which case the legend items will be automatically
    105     * created to match the dataset(s).
    106     */
    107    public class LegendTitle extends Title
    108            implements Cloneable, PublicCloneable, Serializable {
    109
    110        /** For serialization. */
    111        private static final long serialVersionUID = 2644010518533854633L;
    112
    113        /** The default item font. */
    114        public static final Font DEFAULT_ITEM_FONT
    115                = new Font("SansSerif", Font.PLAIN, 12);
    116
    117        /** The default item paint. */
    118        public static final Paint DEFAULT_ITEM_PAINT = Color.black;
    119
    120        /** The sources for legend items. */
    121        private LegendItemSource[] sources;
    122
    123        /** The background paint (possibly <code>null</code>). */
    124        private transient Paint backgroundPaint;
    125
    126        /** The edge for the legend item graphic relative to the text. */
    127        private RectangleEdge legendItemGraphicEdge;
    128
    129        /** The anchor point for the legend item graphic. */
    130        private RectangleAnchor legendItemGraphicAnchor;
    131
    132        /** The legend item graphic location. */
    133        private RectangleAnchor legendItemGraphicLocation;
    134
    135        /** The padding for the legend item graphic. */
    136        private RectangleInsets legendItemGraphicPadding;
    137
    138        /** The item font. */
    139        private Font itemFont;
    140
    141        /** The item paint. */
    142        private transient Paint itemPaint;
    143
    144        /** The padding for the item labels. */
    145        private RectangleInsets itemLabelPadding;
    146
    147        /**
    148         * A container that holds and displays the legend items.
    149         */
    150        private BlockContainer items;
    151
    152        /**
    153         * The layout for the legend when it is positioned at the top or bottom
    154         * of the chart.
    155         */
    156        private Arrangement hLayout;
    157
    158        /**
    159         * The layout for the legend when it is positioned at the left or right
    160         * of the chart.
    161         */
    162        private Arrangement vLayout;
    163
    164        /**
    165         * An optional container for wrapping the legend items (allows for adding
    166         * a title or other text to the legend).
    167         */
    168        private BlockContainer wrapper;
    169
    170        /**
    171         * Constructs a new (empty) legend for the specified source.
    172         *
    173         * @param source  the source.
    174         */
    175        public LegendTitle(LegendItemSource source) {
    176            this(source, new FlowArrangement(), new ColumnArrangement());
    177        }
    178
    179        /**
    180         * Creates a new legend title with the specified arrangement.
    181         *
    182         * @param source  the source.
    183         * @param hLayout  the horizontal item arrangement (<code>null</code> not
    184         *                 permitted).
    185         * @param vLayout  the vertical item arrangement (<code>null</code> not
    186         *                 permitted).
    187         */
    188        public LegendTitle(LegendItemSource source,
    189                           Arrangement hLayout, Arrangement vLayout) {
    190            this.sources = new LegendItemSource[] {source};
    191            this.items = new BlockContainer(hLayout);
    192            this.hLayout = hLayout;
    193            this.vLayout = vLayout;
    194            this.backgroundPaint = null;
    195            this.legendItemGraphicEdge = RectangleEdge.LEFT;
    196            this.legendItemGraphicAnchor = RectangleAnchor.CENTER;
    197            this.legendItemGraphicLocation = RectangleAnchor.CENTER;
    198            this.legendItemGraphicPadding = new RectangleInsets(2.0, 2.0, 2.0, 2.0);
    199            this.itemFont = DEFAULT_ITEM_FONT;
    200            this.itemPaint = DEFAULT_ITEM_PAINT;
    201            this.itemLabelPadding = new RectangleInsets(2.0, 2.0, 2.0, 2.0);
    202        }
    203
    204        /**
    205         * Returns the legend item sources.
    206         *
    207         * @return The sources.
    208         */
    209        public LegendItemSource[] getSources() {
    210            return this.sources;
    211        }
    212
    213        /**
    214         * Sets the legend item sources and sends a {@link TitleChangeEvent} to
    215         * all registered listeners.
    216         *
    217         * @param sources  the sources (<code>null</code> not permitted).
    218         */
    219        public void setSources(LegendItemSource[] sources) {
    220            if (sources == null) {
    221                throw new IllegalArgumentException("Null 'sources' argument.");
    222            }
    223            this.sources = sources;
    224            notifyListeners(new TitleChangeEvent(this));
    225        }
    226
    227        /**
    228         * Returns the background paint.
    229         *
    230         * @return The background paint (possibly <code>null</code>).
    231         */
    232        public Paint getBackgroundPaint() {
    233            return this.backgroundPaint;
    234        }
    235
    236        /**
    237         * Sets the background paint for the legend and sends a
    238         * {@link TitleChangeEvent} to all registered listeners.
    239         *
    240         * @param paint  the paint (<code>null</code> permitted).
    241         */
    242        public void setBackgroundPaint(Paint paint) {
    243            this.backgroundPaint = paint;
    244            notifyListeners(new TitleChangeEvent(this));
    245        }
    246
    247        /**
    248         * Returns the location of the shape within each legend item.
    249         *
    250         * @return The location (never <code>null</code>).
    251         */
    252        public RectangleEdge getLegendItemGraphicEdge() {
    253            return this.legendItemGraphicEdge;
    254        }
    255
    256        /**
    257         * Sets the location of the shape within each legend item.
    258         *
    259         * @param edge  the edge (<code>null</code> not permitted).
    260         */
    261        public void setLegendItemGraphicEdge(RectangleEdge edge) {
    262            if (edge == null) {
    263                throw new IllegalArgumentException("Null 'edge' argument.");
    264            }
    265            this.legendItemGraphicEdge = edge;
    266            notifyListeners(new TitleChangeEvent(this));
    267        }
    268
    269        /**
    270         * Returns the legend item graphic anchor.
    271         *
    272         * @return The graphic anchor (never <code>null</code>).
    273         */
    274        public RectangleAnchor getLegendItemGraphicAnchor() {
    275            return this.legendItemGraphicAnchor;
    276        }
    277
    278        /**
    279         * Sets the anchor point used for the graphic in each legend item.
    280         *
    281         * @param anchor  the anchor point (<code>null</code> not permitted).
    282         */
    283        public void setLegendItemGraphicAnchor(RectangleAnchor anchor) {
    284            if (anchor == null) {
    285                throw new IllegalArgumentException("Null 'anchor' point.");
    286            }
    287            this.legendItemGraphicAnchor = anchor;
    288        }
    289
    290        /**
    291         * Returns the legend item graphic location.
    292         *
    293         * @return The location (never <code>null</code>).
    294         */
    295        public RectangleAnchor getLegendItemGraphicLocation() {
    296            return this.legendItemGraphicLocation;
    297        }
    298
    299        /**
    300         * Sets the legend item graphic location.
    301         *
    302         * @param anchor  the anchor (<code>null</code> not permitted).
    303         */
    304        public void setLegendItemGraphicLocation(RectangleAnchor anchor) {
    305            this.legendItemGraphicLocation = anchor;
    306        }
    307
    308        /**
    309         * Returns the padding that will be applied to each item graphic.
    310         *
    311         * @return The padding (never <code>null</code>).
    312         */
    313        public RectangleInsets getLegendItemGraphicPadding() {
    314            return this.legendItemGraphicPadding;
    315        }
    316
    317        /**
    318         * Sets the padding that will be applied to each item graphic in the
    319         * legend and sends a {@link TitleChangeEvent} to all registered listeners.
    320         *
    321         * @param padding  the padding (<code>null</code> not permitted).
    322         */
    323        public void setLegendItemGraphicPadding(RectangleInsets padding) {
    324            if (padding == null) {
    325                throw new IllegalArgumentException("Null 'padding' argument.");
    326            }
    327            this.legendItemGraphicPadding = padding;
    328            notifyListeners(new TitleChangeEvent(this));
    329        }
    330
    331        /**
    332         * Returns the item font.
    333         *
    334         * @return The font (never <code>null</code>).
    335         */
    336        public Font getItemFont() {
    337            return this.itemFont;
    338        }
    339
    340        /**
    341         * Sets the item font and sends a {@link TitleChangeEvent} to
    342         * all registered listeners.
    343         *
    344         * @param font  the font (<code>null</code> not permitted).
    345         */
    346        public void setItemFont(Font font) {
    347            if (font == null) {
    348                throw new IllegalArgumentException("Null 'font' argument.");
    349            }
    350            this.itemFont = font;
    351            notifyListeners(new TitleChangeEvent(this));
    352        }
    353
    354        /**
    355         * Returns the item paint.
    356         *
    357         * @return The paint (never <code>null</code>).
    358         */
    359        public Paint getItemPaint() {
    360            return this.itemPaint;
    361        }
    362
    363        /**
    364         * Sets the item paint.
    365         *
    366         * @param paint  the paint (<code>null</code> not permitted).
    367         */
    368        public void setItemPaint(Paint paint) {
    369            if (paint == null) {
    370                throw new IllegalArgumentException("Null 'paint' argument.");
    371            }
    372            this.itemPaint = paint;
    373            notifyListeners(new TitleChangeEvent(this));
    374        }
    375
    376        /**
    377         * Returns the padding used for the items labels.
    378         *
    379         * @return The padding (never <code>null</code>).
    380         */
    381        public RectangleInsets getItemLabelPadding() {
    382            return this.itemLabelPadding;
    383        }
    384
    385        /**
    386         * Sets the padding used for the item labels in the legend.
    387         *
    388         * @param padding  the padding (<code>null</code> not permitted).
    389         */
    390        public void setItemLabelPadding(RectangleInsets padding) {
    391            if (padding == null) {
    392                throw new IllegalArgumentException("Null 'padding' argument.");
    393            }
    394            this.itemLabelPadding = padding;
    395            notifyListeners(new TitleChangeEvent(this));
    396        }
    397
    398        /**
    399         * Fetches the latest legend items.
    400         */
    401        protected void fetchLegendItems() {
    402            this.items.clear();
    403            RectangleEdge p = getPosition();
    404            if (RectangleEdge.isTopOrBottom(p)) {
    405                this.items.setArrangement(this.hLayout);
    406            }
    407            else {
    408                this.items.setArrangement(this.vLayout);
    409            }
    410            for (int s = 0; s < this.sources.length; s++) {
    411                LegendItemCollection legendItems = this.sources[s].getLegendItems();
    412                if (legendItems != null) {
    413                    for (int i = 0; i < legendItems.getItemCount(); i++) {
    414                        LegendItem item = legendItems.get(i);
    415                        Block block = createLegendItemBlock(item);
    416                        this.items.add(block);
    417                    }
    418                }
    419            }
    420        }
    421
    422        /**
    423         * Creates a legend item block.
    424         *
    425         * @param item  the legend item.
    426         *
    427         * @return The block.
    428         */
    429        protected Block createLegendItemBlock(LegendItem item) {
    430            BlockContainer result = null;
    431            LegendGraphic lg = new LegendGraphic(item.getShape(),
    432                    item.getFillPaint());
    433            lg.setFillPaintTransformer(item.getFillPaintTransformer());
    434            lg.setShapeFilled(item.isShapeFilled());
    435            lg.setLine(item.getLine());
    436            lg.setLineStroke(item.getLineStroke());
    437            lg.setLinePaint(item.getLinePaint());
    438            lg.setLineVisible(item.isLineVisible());
    439            lg.setShapeVisible(item.isShapeVisible());
    440            lg.setShapeOutlineVisible(item.isShapeOutlineVisible());
    441            lg.setOutlinePaint(item.getOutlinePaint());
    442            lg.setOutlineStroke(item.getOutlineStroke());
    443            lg.setPadding(this.legendItemGraphicPadding);
    444
    445            LegendItemBlockContainer legendItem = new LegendItemBlockContainer(
    446                    new BorderArrangement(), item.getDataset(),
    447                    item.getSeriesKey());
    448            lg.setShapeAnchor(getLegendItemGraphicAnchor());
    449            lg.setShapeLocation(getLegendItemGraphicLocation());
    450            legendItem.add(lg, this.legendItemGraphicEdge);
    451            Font textFont = item.getLabelFont();
    452            if (textFont == null) {
    453                textFont = this.itemFont;
    454            }
    455            Paint textPaint = item.getLabelPaint();
    456            if (textPaint == null) {
    457                textPaint = this.itemPaint;
    458            }
    459            LabelBlock labelBlock = new LabelBlock(item.getLabel(), textFont,
    460                    textPaint);
    461            labelBlock.setPadding(this.itemLabelPadding);
    462            legendItem.add(labelBlock);
    463            legendItem.setToolTipText(item.getToolTipText());
    464            legendItem.setURLText(item.getURLText());
    465
    466            result = new BlockContainer(new CenterArrangement());
    467            result.add(legendItem);
    468
    469            return result;
    470        }
    471
    472        /**
    473         * Returns the container that holds the legend items.
    474         *
    475         * @return The container for the legend items.
    476         */
    477        public BlockContainer getItemContainer() {
    478            return this.items;
    479        }
    480
    481        /**
    482         * Arranges the contents of the block, within the given constraints, and
    483         * returns the block size.
    484         *
    485         * @param g2  the graphics device.
    486         * @param constraint  the constraint (<code>null</code> not permitted).
    487         *
    488         * @return The block size (in Java2D units, never <code>null</code>).
    489         */
    490        public Size2D arrange(Graphics2D g2, RectangleConstraint constraint) {
    491            Size2D result = new Size2D();
    492            fetchLegendItems();
    493            if (this.items.isEmpty()) {
    494                return result;
    495            }
    496            BlockContainer container = this.wrapper;
    497            if (container == null) {
    498                container = this.items;
    499            }
    500            RectangleConstraint c = toContentConstraint(constraint);
    501            Size2D size = container.arrange(g2, c);
    502            result.height = calculateTotalHeight(size.height);
    503            result.width = calculateTotalWidth(size.width);
    504            return result;
    505        }
    506
    507        /**
    508         * Draws the title on a Java 2D graphics device (such as the screen or a
    509         * printer).
    510         *
    511         * @param g2  the graphics device.
    512         * @param area  the available area for the title.
    513         */
    514        public void draw(Graphics2D g2, Rectangle2D area) {
    515            draw(g2, area, null);
    516        }
    517
    518        /**
    519         * Draws the block within the specified area.
    520         *
    521         * @param g2  the graphics device.
    522         * @param area  the area.
    523         * @param params  ignored (<code>null</code> permitted).
    524         *
    525         * @return An {@link org.jfree.chart.block.EntityBlockResult} or
    526         *         <code>null</code>.
    527         */
    528        public Object draw(Graphics2D g2, Rectangle2D area, Object params) {
    529            Rectangle2D target = (Rectangle2D) area.clone();
    530            Rectangle2D hotspot = (Rectangle2D) area.clone();
    531            StandardEntityCollection sec = null;
    532            if (params instanceof EntityBlockParams
    533                    && ((EntityBlockParams) params).getGenerateEntities()) {
    534                sec = new StandardEntityCollection();
    535                sec.add(new TitleEntity(hotspot, this));
    536            }
    537            target = trimMargin(target);
    538            if (this.backgroundPaint != null) {
    539                g2.setPaint(this.backgroundPaint);
    540                g2.fill(target);
    541            }
    542            BlockFrame border = getFrame();
    543            border.draw(g2, target);
    544            border.getInsets().trim(target);
    545            BlockContainer container = this.wrapper;
    546            if (container == null) {
    547                container = this.items;
    548            }
    549            target = trimPadding(target);
    550            Object val = container.draw(g2, target, params);
    551            if (val instanceof BlockResult) {
    552                EntityCollection ec = ((BlockResult) val).getEntityCollection();
    553                if (ec != null && sec != null) {
    554                    sec.addAll(ec);
    555                    ((BlockResult) val).setEntityCollection(sec);
    556                }
    557            }
    558            return val;
    559        }
    560
    561        /**
    562         * Returns the wrapper container, if any.
    563         *
    564         * @return The wrapper container (possibly <code>null</code>).
    565         *
    566         * @since 1.0.11
    567         */
    568        public BlockContainer getWrapper() {
    569            return this.wrapper;
    570        }
    571
    572        /**
    573         * Sets the wrapper container for the legend.
    574         *
    575         * @param wrapper  the wrapper container.
    576         */
    577        public void setWrapper(BlockContainer wrapper) {
    578            this.wrapper = wrapper;
    579        }
    580
    581        /**
    582         * Tests this title for equality with an arbitrary object.
    583         *
    584         * @param obj  the object (<code>null</code> permitted).
    585         *
    586         * @return A boolean.
    587         */
    588        public boolean equals(Object obj) {
    589            if (obj == this) {
    590                return true;
    591            }
    592            if (!(obj instanceof LegendTitle)) {
    593                return false;
    594            }
    595            if (!super.equals(obj)) {
    596                return false;
    597            }
    598            LegendTitle that = (LegendTitle) obj;
    599            if (!PaintUtilities.equal(this.backgroundPaint, that.backgroundPaint)) {
    600                return false;
    601            }
    602            if (this.legendItemGraphicEdge != that.legendItemGraphicEdge) {
    603                return false;
    604            }
    605            if (this.legendItemGraphicAnchor != that.legendItemGraphicAnchor) {
    606                return false;
    607            }
    608            if (this.legendItemGraphicLocation != that.legendItemGraphicLocation) {
    609                return false;
    610            }
    611            if (!this.itemFont.equals(that.itemFont)) {
    612                return false;
    613            }
    614            if (!this.itemPaint.equals(that.itemPaint)) {
    615                return false;
    616            }
    617            if (!this.hLayout.equals(that.hLayout)) {
    618                return false;
    619            }
    620            if (!this.vLayout.equals(that.vLayout)) {
    621                return false;
    622            }
    623            return true;
    624        }
    625
    626        /**
    627         * Provides serialization support.
    628         *
    629         * @param stream  the output stream.
    630         *
    631         * @throws IOException  if there is an I/O error.
    632         */
    633        private void writeObject(ObjectOutputStream stream) throws IOException {
    634            stream.defaultWriteObject();
    635            SerialUtilities.writePaint(this.backgroundPaint, stream);
    636            SerialUtilities.writePaint(this.itemPaint, stream);
    637        }
    638
    639        /**
    640         * Provides serialization support.
    641         *
    642         * @param stream  the input stream.
    643         *
    644         * @throws IOException  if there is an I/O error.
    645         * @throws ClassNotFoundException  if there is a classpath problem.
    646         */
    647        private void readObject(ObjectInputStream stream)
    648            throws IOException, ClassNotFoundException {
    649            stream.defaultReadObject();
    650            this.backgroundPaint = SerialUtilities.readPaint(stream);
    651            this.itemPaint = SerialUtilities.readPaint(stream);
    652        }
    653
    654    }