spiderwebplot.java

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/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2005, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 * 
 * ------------------
 * SpiderWebPlot.java
 * ------------------
 * (C) Copyright 2005, by Heaps of Flavour Pty Ltd.
 *
 * Company Info:  http://www.i4-talent.com
 *
 * Original Author:  Don Elliott;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: SpiderWebPlot.java,v 1.11 2005/05/19 14:03:40 mungady Exp $
 *
 * Changes (from 28-Jan-2005)
 * --------------------------
 * 28-Jan-2005 : First cut - missing a few features - still to do:
 *                           - needs tooltips/URL/label generator functions
 *                           - ticks on axes / background grid?
 * 31-Jan-2005 : Renamed SpiderWebPlot, added label generator support, and 
 *               reformatted for consistency with other source files in 
 *               JFreeChart (DG);
 * 20-Apr-2005 : Renamed CategoryLabelGenerator 
 *               --> CategoryItemLabelGenerator (DG);
 * 05-May-2005 : Updated draw() method parameters (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.Graphics2D;
import java.awt.Paint;
import java.awt.Polygon;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.font.FontRenderContext;
import java.awt.font.LineMetrics;
import java.awt.geom.Arc2D;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;
import java.util.Iterator;
import java.util.List;

import org.jfree.chart.LegendItem;
import org.jfree.chart.LegendItemCollection;
import org.jfree.chart.event.PlotChangeEvent;
import org.jfree.chart.labels.CategoryItemLabelGenerator;
import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.ui.RectangleInsets;
import org.jfree.util.PaintList;
import org.jfree.util.Rotation;
import org.jfree.util.StrokeList;
import org.jfree.util.TableOrder;

/**
 * A plot that displays data from a {@link CategoryDataset} in the form of a 
 * "spider web".  Multiple series can be plotted on the same axis to allow 
 * easy comparison.
 */
public class SpiderWebPlot extends Plot implements Cloneable, Serializable {
    
    /** For serialization. */
    private static final long serialVersionUID = -5376340422031599463L;
    
    /** The default head radius percent (currently 1%). */
    public static final double DEFAULT_HEAD = 0.01;

    /** The default axis label gap (currently 10%). */
    public static final double DEFAULT_AXIS_LABEL_GAP = 0.10;
 
    /** The default interior gap. */
    public static final double DEFAULT_INTERIOR_GAP = 0.25;

    /** The maximum interior gap (currently 40%). */
    public static final double MAX_INTERIOR_GAP = 0.40;

    /** The default starting angle for the radar chart axes. */
    public static final double DEFAULT_START_ANGLE = 90.0;

    /** The default series label font. */
    public static final Font   DEFAULT_LABEL_FONT = new Font(
        "SansSerif", Font.PLAIN, 10
    );
    
    /** The default series label paint. */
    public static final Paint  DEFAULT_LABEL_PAINT = Color.black;

    /** The default series label background paint. */
    public static final Paint  DEFAULT_LABEL_BACKGROUND_PAINT 
        = new Color(255, 255, 192);

    /** The default series label outline paint. */
    public static final Paint  DEFAULT_LABEL_OUTLINE_PAINT = Color.black;

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

    /** The default series label shadow paint. */
    public static final Paint  DEFAULT_LABEL_SHADOW_PAINT = Color.lightGray;

    /** 
     * The default maximum value plotted - forces the plot to evaluate
     *  the maximum from the data passed in
     */
    public static final double DEFAULT_MAX_VALUE = -1.0;

    /** The head radius as a percentage of the available drawing area. */
    protected double headPercent;

    /** The space left around the outside of the plot as a percentage. */
    private double interiorGap;

    /** The gap between the labels and the axes as a %age of the radius. */
    private double axisLabelGap;

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

    /** The maximum value we are plotting against on each category axis */
    private double maxValue;
  
    /** 
     * The data extract order (BY_ROW or BY_COLUMN). This denotes whether
     * the data series are stored in rows (in which case the category names are
     * derived from the column keys) or in columns (in which case the category
     * names are derived from the row keys).
     */
    private TableOrder dataExtractOrder;

    /** The starting angle. */
    private double startAngle;

    /** The direction for drawing the radar axis & plots. */
    private Rotation direction;

    /** The legend item shape. */
    private transient Shape legendItemShape;

    /** The paint for ALL series (overrides list). */
    private transient Paint seriesPaint;

    /** The series paint list. */
    private PaintList seriesPaintList;

    /** The base series paint (fallback). */
    private transient Paint baseSeriesPaint;

    /** The outline paint for ALL series (overrides list). */
    private transient Paint seriesOutlinePaint;

    /** The series outline paint list. */
    private PaintList seriesOutlinePaintList;

    /** The base series outline paint (fallback). */
    private transient Paint baseSeriesOutlinePaint;

    /** The outline stroke for ALL series (overrides list). */
    private transient Stroke seriesOutlineStroke;

    /** The series outline stroke list. */
    private StrokeList seriesOutlineStrokeList;

    /** The base series outline stroke (fallback). */
    private transient Stroke baseSeriesOutlineStroke;

    /** The font used to display the category labels. */
    private Font labelFont;

    /** The color used to draw the category labels. */
    private transient Paint labelPaint;
    
    /** The label generator. */
    private CategoryItemLabelGenerator labelGenerator;

    /** controls if the web polygons are filled or not */
    private boolean webFilled = true;
  
    /**
     * Creates a new radar plot with default attributes.
     * 
     * @param dataset  the dataset.
     */
    public SpiderWebPlot(CategoryDataset dataset) {
        super();
        this.dataset = dataset;
    
        if (dataset != null) {
            dataset.addChangeListener(this);
        }

        this.dataExtractOrder = TableOrder.BY_ROW;
        this.headPercent = DEFAULT_HEAD;
        this.axisLabelGap = DEFAULT_AXIS_LABEL_GAP;

        this.interiorGap = DEFAULT_INTERIOR_GAP;
        this.startAngle = DEFAULT_START_ANGLE;
        this.direction = Rotation.CLOCKWISE;
        this.maxValue = DEFAULT_MAX_VALUE;

        this.seriesPaint = null;
        this.seriesPaintList = new PaintList();
        this.baseSeriesPaint = null;

        this.seriesOutlinePaint = null;
        this.seriesOutlinePaintList = new PaintList();
        this.baseSeriesOutlinePaint = DEFAULT_OUTLINE_PAINT;

        this.seriesOutlineStroke = null;
        this.seriesOutlineStrokeList = new StrokeList();
        this.baseSeriesOutlineStroke = DEFAULT_OUTLINE_STROKE;

        this.labelFont = DEFAULT_LABEL_FONT;
        this.labelPaint = DEFAULT_LABEL_PAINT;
        this.labelGenerator = new StandardCategoryItemLabelGenerator();
        
        this.legendItemShape = DEFAULT_LEGEND_ITEM_CIRCLE;
    }

    /**
     * Creates a new radar plot overriding the data extraction order.
     * 
     * @param data  the data.
     * @param type  controls how radar data is extracted (BY_ROW or BY_COLUMN).
     */
    public SpiderWebPlot(CategoryDataset data, TableOrder type) {
        this(data);
        this.dataExtractOrder = type;
    }

    /**
     * Returns a short string describing the type of plot.
     * 
     * @return The plot type.
     */
    public String getPlotType() {
        // return localizationResources.getString("Radar_Plot");
        return ("Radar Plot");
    }
    
    /**
     * Method to determine if the web chart is to be filled.
     * 
     * @return A boolean.
     */
    public boolean isWebFilled() {
        return this.webFilled;
    }

    /**
     * Sets the webFilled flag and sends a
     * {@link PlotChangeEvent} to all registered listeners.
     * 
     * @param flag  the flag.
     */
    public void setWebFilled(boolean flag) {
        this.webFilled = flag;
        notifyListeners(new PlotChangeEvent(this));
    }
  
    /**
     * Returns the data extract order (by row or by column).
     * 
     * @return The data extract order (never <code>null</code>).
     */
    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</code> not permitted).
     */
    public void setDataExtractOrder(TableOrder order) {
        if (order == null) {
            throw new IllegalArgumentException("Null 'order' argument");
        }
        this.dataExtractOrder = order;
        notifyListeners(new PlotChangeEvent(this));
    }

    /**
     * Returns the start angle for the first radar axis.
     * <BR>
     * This is measured in degrees starting from 3 o'clock (Java Arc2D default)
     * and measuring anti-clockwise.
     * 
     * @return The start angle.
     */
    public double getStartAngle() {
        return this.startAngle;
    }

    /**
     * Sets the starting angle and sends a {@link PlotChangeEvent} to all
     * registered listeners.
     * <P>
     * The initial default value is 90 degrees, which corresponds to 12 o'clock.
     * A value of zero corresponds to 3 o'clock... this is the encoding used by
     * Java's Arc2D class.
     * 
     * @param angle  the angle (in degrees).
     */
    public void setStartAngle(double angle) {
        this.startAngle = angle;
        notifyListeners(new PlotChangeEvent(this));
    }

    /**
     * Returns the maximum value any category axis can take.
     * 
     * @return The maximum value.
     */
    public double getMaxValue() {
        return this.maxValue;
    }

    /**
     * Sets the maximum value any category axis can take and sends 
     * a {@link PlotChangeEvent} to all registered listeners.
     * 
     * @param value  the maximum value.
     */
    public void setMaxValue(double value) {
        this.maxValue = value;
        notifyListeners(new PlotChangeEvent(this));
    }

    /**
     * Returns the direction in which the radar axes are drawn
     * (clockwise or anti-clockwise).
     * 
     * @return The direction (never <code>null</code>).
     */
    public Rotation getDirection() {
        return this.direction;
    }

    /**
     * Sets the direction in which the radar axes are drawn and sends a
     * {@link PlotChangeEvent} to all registered listeners.
     * 
     * @param direction  the direction (<code>null</code> not permitted).
     */
    public void setDirection(Rotation direction) {
        if (direction == null) {
            throw new IllegalArgumentException("Null 'direction' argument.");
        }
        this.direction = direction;