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jfreechart example source code file (MultiplePiePlot.java)

This example jfreechart source code file (MultiplePiePlot.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, comparable, comparable, geometry, illegalargumentexception, io, jfreechart, legenditemcollection, multiplepieplot, multiplepieplot, null, paint, paint, pieplot, pieplot, rectangle, string, util

The jfreechart MultiplePiePlot.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.]
 *
 * --------------------
 * MultiplePiePlot.java
 * --------------------
 * (C) Copyright 2004-2009, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Brian Cabana (patch 1943021);
 *
 * Changes
 * -------
 * 29-Jan-2004 : Version 1 (DG);
 * 31-Mar-2004 : Added setPieIndex() call during drawing (DG);
 * 20-Apr-2005 : Small change for update to LegendItem constructors (DG);
 * 05-May-2005 : Updated draw() method parameters (DG);
 * 16-Jun-2005 : Added get/setDataset() and equals() methods (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 06-Apr-2006 : Fixed bug 1190647 - legend and section colors not consistent
 *               when aggregation limit is specified (DG);
 * 27-Sep-2006 : Updated draw() method for deprecated code (DG);
 * 17-Jan-2007 : Updated prefetchSectionPaints() to check settings in
 *               underlying PiePlot (DG);
 * 17-May-2007 : Added argument check to setPieChart() (DG);
 * 18-May-2007 : Set dataset for LegendItem (DG);
 * 18-Apr-2008 : In the constructor, register the plot as a dataset listener -
 *               see patch 1943021 from Brian Cabana (DG);
 * 30-Dec-2008 : Added legendItemShape field, and fixed cloning bug (DG);
 * 09-Jan-2009 : See ignoreNullValues to true for sub-chart (DG);
 *
 */

package org.jfree.chart.plot;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Rectangle;
import java.awt.Shape;
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 java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.jfree.chart.ChartRenderingInfo;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.LegendItem;
import org.jfree.chart.LegendItemCollection;
import org.jfree.chart.event.PlotChangeEvent;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.CategoryToPieDataset;
import org.jfree.data.general.DatasetChangeEvent;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.data.general.PieDataset;
import org.jfree.io.SerialUtilities;
import org.jfree.ui.RectangleEdge;
import org.jfree.ui.RectangleInsets;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PaintUtilities;
import org.jfree.util.ShapeUtilities;
import org.jfree.util.TableOrder;

/**
 * A plot that displays multiple pie plots using data from a
 * {@link CategoryDataset}.
 */
public class MultiplePiePlot extends Plot implements Cloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -355377800470807389L;

    /** The chart object that draws the individual pie charts. */
    private JFreeChart pieChart;

    /** The dataset. */
    private CategoryDataset dataset;

    /** The data extract order (by row or by column). */
    private TableOrder dataExtractOrder;

    /** The pie section limit percentage. */
    private double limit = 0.0;

    /**
     * The key for the aggregated items.
     *
     * @since 1.0.2
     */
    private Comparable aggregatedItemsKey;

    /**
     * The paint for the aggregated items.
     *
     * @since 1.0.2
     */
    private transient Paint aggregatedItemsPaint;

    /**
     * The colors to use for each section.
     *
     * @since 1.0.2
     */
    private transient Map sectionPaints;

    /**
     * The legend item shape (never null).
     *
     * @since 1.0.12
     */
    private transient Shape legendItemShape;

    /**
     * Creates a new plot with no data.
     */
    public MultiplePiePlot() {
        this(null);
    }

    /**
     * Creates a new plot.
     *
     * @param dataset  the dataset (<code>null permitted).
     */
    public MultiplePiePlot(CategoryDataset dataset) {
        super();
        setDataset(dataset);
        PiePlot piePlot = new PiePlot(null);
        piePlot.setIgnoreNullValues(true);
        this.pieChart = new JFreeChart(piePlot);
        this.pieChart.removeLegend();
        this.dataExtractOrder = TableOrder.BY_COLUMN;
        this.pieChart.setBackgroundPaint(null);
        TextTitle seriesTitle = new TextTitle("Series Title",
                new Font("SansSerif", Font.BOLD, 12));
        seriesTitle.setPosition(RectangleEdge.BOTTOM);
        this.pieChart.setTitle(seriesTitle);
        this.aggregatedItemsKey = "Other";
        this.aggregatedItemsPaint = Color.lightGray;
        this.sectionPaints = new HashMap();
        this.legendItemShape = new Ellipse2D.Double(-4.0, -4.0, 8.0, 8.0);
    }

    /**
     * Returns the dataset used by the plot.
     *
     * @return The dataset (possibly <code>null).
     */
    public CategoryDataset getDataset() {
        return this.dataset;
    }

    /**
     * Sets the dataset used by the plot and sends a {@link PlotChangeEvent}
     * to all registered listeners.
     *
     * @param dataset  the dataset (<code>null permitted).
     */
    public void setDataset(CategoryDataset dataset) {
        // if there is an existing dataset, remove the plot from the list of
        // change listeners...
        if (this.dataset != null) {
            this.dataset.removeChangeListener(this);
        }

        // set the new dataset, and register the chart as a change listener...
        this.dataset = dataset;
        if (dataset != null) {
            setDatasetGroup(dataset.getGroup());
            dataset.addChangeListener(this);
        }

        // send a dataset change event to self to trigger plot change event
        datasetChanged(new DatasetChangeEvent(this, dataset));
    }

    /**
     * Returns the pie chart that is used to draw the individual pie plots.
     * Note that there are some attributes on this chart instance that will
     * be ignored at rendering time (for example, legend item settings).
     *
     * @return The pie chart (never <code>null).
     *
     * @see #setPieChart(JFreeChart)
     */
    public JFreeChart getPieChart() {
        return this.pieChart;
    }

    /**
     * Sets the chart that is used to draw the individual pie plots.  The
     * chart's plot must be an instance of {@link PiePlot}.
     *
     * @param pieChart  the pie chart (<code>null not permitted).
     *
     * @see #getPieChart()
     */
    public void setPieChart(JFreeChart pieChart) {
        if (pieChart == null) {
            throw new IllegalArgumentException("Null 'pieChart' argument.");
        }
        if (!(pieChart.getPlot() instanceof PiePlot)) {
            throw new IllegalArgumentException("The 'pieChart' argument must "
                    + "be a chart based on a PiePlot.");
        }
        this.pieChart = pieChart;
        fireChangeEvent();
    }

    /**
     * Returns the data extract order (by row or by column).
     *
     * @return The data extract order (never <code>null).
     */
    public TableOrder getDataExtractOrder() {
        return this.dataExtractOrder;
    }

    /**
     * Sets the data extract order (by row or by column) and sends a
     * {@link PlotChangeEvent} to all registered listeners.
     *
     * @param order  the order (<code>null not permitted).
     */
    public void setDataExtractOrder(TableOrder order) {
        if (order == null) {
            throw new IllegalArgumentException("Null 'order' argument");
        }
        this.dataExtractOrder = order;
        fireChangeEvent();
    }

    /**
     * Returns the limit (as a percentage) below which small pie sections are
     * aggregated.
     *
     * @return The limit percentage.
     */
    public double getLimit() {
        return this.limit;
    }

    /**
     * Sets the limit below which pie sections are aggregated.
     * Set this to 0.0 if you don't want any aggregation to occur.
     *
     * @param limit  the limit percent.
     */
    public void setLimit(double limit) {
        this.limit = limit;
        fireChangeEvent();
    }

    /**
     * Returns the key for aggregated items in the pie plots, if there are any.
     * The default value is "Other".
     *
     * @return The aggregated items key.
     *
     * @since 1.0.2
     */
    public Comparable getAggregatedItemsKey() {
        return this.aggregatedItemsKey;
    }

    /**
     * Sets the key for aggregated items in the pie plots.  You must ensure
     * that this doesn't clash with any keys in the dataset.
     *
     * @param key  the key (<code>null not permitted).
     *
     * @since 1.0.2
     */
    public void setAggregatedItemsKey(Comparable key) {
        if (key == null) {
            throw new IllegalArgumentException("Null 'key' argument.");
        }
        this.aggregatedItemsKey = key;
        fireChangeEvent();
    }

    /**
     * Returns the paint used to draw the pie section representing the
     * aggregated items.  The default value is <code>Color.lightGray.
     *
     * @return The paint.
     *
     * @since 1.0.2
     */
    public Paint getAggregatedItemsPaint() {
        return this.aggregatedItemsPaint;
    }

    /**
     * Sets the paint used to draw the pie section representing the aggregated
     * items and sends a {@link PlotChangeEvent} to all registered listeners.
     *
     * @param paint  the paint (<code>null not permitted).
     *
     * @since 1.0.2
     */
    public void setAggregatedItemsPaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");
        }
        this.aggregatedItemsPaint = paint;
        fireChangeEvent();
    }

    /**
     * Returns a short string describing the type of plot.
     *
     * @return The plot type.
     */
    public String getPlotType() {
        return "Multiple Pie Plot";
         // TODO: need to fetch this from localised resources
    }

    /**
     * Returns the shape used for legend items.
     *
     * @return The shape (never <code>null).
     *
     * @see #setLegendItemShape(Shape)
     *
     * @since 1.0.12
     */
    public Shape getLegendItemShape() {
        return this.legendItemShape;
    }

    /**
     * Sets the shape used for legend items and sends a {@link PlotChangeEvent}
     * to all registered listeners.
     *
     * @param shape  the shape (<code>null not permitted).
     *
     * @see #getLegendItemShape()
     *
     * @since 1.0.12
     */
    public void setLegendItemShape(Shape shape) {
        if (shape == null) {
            throw new IllegalArgumentException("Null 'shape' argument.");
        }
        this.legendItemShape = shape;
        fireChangeEvent();
    }

    /**
     * Draws the plot on a Java 2D graphics device (such as the screen or a
     * printer).
     *
     * @param g2  the graphics device.
     * @param area  the area within which the plot should be drawn.
     * @param anchor  the anchor point (<code>null permitted).
     * @param parentState  the state from the parent plot, if there is one.
     * @param info  collects info about the drawing.
     */
    public void draw(Graphics2D g2,
                     Rectangle2D area,
                     Point2D anchor,
                     PlotState parentState,
                     PlotRenderingInfo info) {


        // adjust the drawing area for the plot insets (if any)...
        RectangleInsets insets = getInsets();
        insets.trim(area);
        drawBackground(g2, area);
        drawOutline(g2, area);

        // check that there is some data to display...
        if (DatasetUtilities.isEmptyOrNull(this.dataset)) {
            drawNoDataMessage(g2, area);
            return;
        }

        int pieCount = 0;
        if (this.dataExtractOrder == TableOrder.BY_ROW) {
            pieCount = this.dataset.getRowCount();
        }
        else {
            pieCount = this.dataset.getColumnCount();
        }

        // the columns variable is always >= rows
        int displayCols = (int) Math.ceil(Math.sqrt(pieCount));
        int displayRows
            = (int) Math.ceil((double) pieCount / (double) displayCols);

        // swap rows and columns to match plotArea shape
        if (displayCols > displayRows && area.getWidth() < area.getHeight()) {
            int temp = displayCols;
            displayCols = displayRows;
            displayRows = temp;
        }

        prefetchSectionPaints();

        int x = (int) area.getX();
        int y = (int) area.getY();
        int width = ((int) area.getWidth()) / displayCols;
        int height = ((int) area.getHeight()) / displayRows;
        int row = 0;
        int column = 0;
        int diff = (displayRows * displayCols) - pieCount;
        int xoffset = 0;
        Rectangle rect = new Rectangle();

        for (int pieIndex = 0; pieIndex < pieCount; pieIndex++) {
            rect.setBounds(x + xoffset + (width * column), y + (height * row),
                    width, height);

            String title = null;
            if (this.dataExtractOrder == TableOrder.BY_ROW) {
                title = this.dataset.getRowKey(pieIndex).toString();
            }
            else {
                title = this.dataset.getColumnKey(pieIndex).toString();
            }
            this.pieChart.setTitle(title);

            PieDataset piedataset = null;
            PieDataset dd = new CategoryToPieDataset(this.dataset,
                    this.dataExtractOrder, pieIndex);
            if (this.limit > 0.0) {
                piedataset = DatasetUtilities.createConsolidatedPieDataset(
                        dd, this.aggregatedItemsKey, this.limit);
            }
            else {
                piedataset = dd;
            }
            PiePlot piePlot = (PiePlot) this.pieChart.getPlot();
            piePlot.setDataset(piedataset);
            piePlot.setPieIndex(pieIndex);

            // update the section colors to match the global colors...
            for (int i = 0; i < piedataset.getItemCount(); i++) {
                Comparable key = piedataset.getKey(i);
                Paint p;
                if (key.equals(this.aggregatedItemsKey)) {
                    p = this.aggregatedItemsPaint;
                }
                else {
                    p = (Paint) this.sectionPaints.get(key);
                }
                piePlot.setSectionPaint(key, p);
            }

            ChartRenderingInfo subinfo = null;
            if (info != null) {
                subinfo = new ChartRenderingInfo();
            }
            this.pieChart.draw(g2, rect, subinfo);
            if (info != null) {
                info.getOwner().getEntityCollection().addAll(
                        subinfo.getEntityCollection());
                info.addSubplotInfo(subinfo.getPlotInfo());
            }

            ++column;
            if (column == displayCols) {
                column = 0;
                ++row;

                if (row == displayRows - 1 && diff != 0) {
                    xoffset = (diff * width) / 2;
                }
            }
        }

    }

    /**
     * For each key in the dataset, check the <code>sectionPaints
     * cache to see if a paint is associated with that key and, if not,
     * fetch one from the drawing supplier.  These colors are cached so that
     * the legend and all the subplots use consistent colors.
     */
    private void prefetchSectionPaints() {

        // pre-fetch the colors for each key...this is because the subplots
        // may not display every key, but we need the coloring to be
        // consistent...

        PiePlot piePlot = (PiePlot) getPieChart().getPlot();

        if (this.dataExtractOrder == TableOrder.BY_ROW) {
            // column keys provide potential keys for individual pies
            for (int c = 0; c < this.dataset.getColumnCount(); c++) {
                Comparable key = this.dataset.getColumnKey(c);
                Paint p = piePlot.getSectionPaint(key);
                if (p == null) {
                    p = (Paint) this.sectionPaints.get(key);
                    if (p == null) {
                        p = getDrawingSupplier().getNextPaint();
                    }
                }
                this.sectionPaints.put(key, p);
            }
        }
        else {
            // row keys provide potential keys for individual pies
            for (int r = 0; r < this.dataset.getRowCount(); r++) {
                Comparable key = this.dataset.getRowKey(r);
                Paint p = piePlot.getSectionPaint(key);
                if (p == null) {
                    p = (Paint) this.sectionPaints.get(key);
                    if (p == null) {
                        p = getDrawingSupplier().getNextPaint();
                    }
                }
                this.sectionPaints.put(key, p);
            }
        }

    }

    /**
     * Returns a collection of legend items for the pie chart.
     *
     * @return The legend items.
     */
    public LegendItemCollection getLegendItems() {

        LegendItemCollection result = new LegendItemCollection();
        if (this.dataset == null) {
            return result;
        }

        List keys = null;
        prefetchSectionPaints();
        if (this.dataExtractOrder == TableOrder.BY_ROW) {
            keys = this.dataset.getColumnKeys();
        }
        else if (this.dataExtractOrder == TableOrder.BY_COLUMN) {
            keys = this.dataset.getRowKeys();
        }

        if (keys != null) {
            int section = 0;
            Iterator iterator = keys.iterator();
            while (iterator.hasNext()) {
                Comparable key = (Comparable) iterator.next();
                String label = key.toString();  // TODO: use a generator here
                String description = label;
                Paint paint = (Paint) this.sectionPaints.get(key);
                LegendItem item = new LegendItem(label, description, null,
                        null, getLegendItemShape(), paint,
                        Plot.DEFAULT_OUTLINE_STROKE, paint);
                item.setDataset(getDataset());
                result.add(item);
                section++;
            }
        }
        if (this.limit > 0.0) {
            result.add(new LegendItem(this.aggregatedItemsKey.toString(),
                    this.aggregatedItemsKey.toString(), null, null,
                    getLegendItemShape(), this.aggregatedItemsPaint,
                    Plot.DEFAULT_OUTLINE_STROKE, this.aggregatedItemsPaint));
        }
        return result;
    }

    /**
     * Tests this plot for equality with an arbitrary object.  Note that the
     * plot's dataset is not considered in the equality test.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return <code>true if this plot is equal to obj, and
     *     <code>false otherwise.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof MultiplePiePlot)) {
            return false;
        }
        MultiplePiePlot that = (MultiplePiePlot) obj;
        if (this.dataExtractOrder != that.dataExtractOrder) {
            return false;
        }
        if (this.limit != that.limit) {
            return false;
        }
        if (!this.aggregatedItemsKey.equals(that.aggregatedItemsKey)) {
            return false;
        }
        if (!PaintUtilities.equal(this.aggregatedItemsPaint,
                that.aggregatedItemsPaint)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.pieChart, that.pieChart)) {
            return false;
        }
        if (!ShapeUtilities.equal(this.legendItemShape, that.legendItemShape)) {
            return false;
        }
        if (!super.equals(obj)) {
            return false;
        }
        return true;
    }

    /**
     * Returns 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 {
        MultiplePiePlot clone = (MultiplePiePlot) super.clone();
        clone.pieChart = (JFreeChart) this.pieChart.clone();
        clone.sectionPaints = new HashMap(this.sectionPaints);
        clone.legendItemShape = ShapeUtilities.clone(this.legendItemShape);
        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.aggregatedItemsPaint, stream);
        SerialUtilities.writeShape(this.legendItemShape, 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.aggregatedItemsPaint = SerialUtilities.readPaint(stream);
        this.legendItemShape = SerialUtilities.readShape(stream);
        this.sectionPaints = new HashMap();
    }

}

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