stackedxyarearenderer.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.]
 *
 * --------------------------
 * StackedXYAreaRenderer.java
 * --------------------------
 * (C) Copyright 2003-2005, by Richard Atkinson and Contributors.
 *
 * Original Author:  Richard Atkinson;
 * Contributor(s):   Christian W. Zuckschwerdt;
 *                   David Gilbert (for Object Refinery Limited);
 *
 * $Id: StackedXYAreaRenderer.java,v 1.12 2005/06/02 09:11:52 mungady Exp $
 *
 * Changes:
 * --------
 * 27-Jul-2003 : Initial version (RA);
 * 30-Jul-2003 : Modified entity constructor (CZ);
 * 18-Aug-2003 : Now handles null values (RA);
 * 20-Aug-2003 : Implemented Cloneable, PublicCloneable and Serializable (DG);
 * 22-Sep-2003 : Changed to be a two pass renderer with optional shape Paint 
 *               and Stroke (RA);
 * 07-Oct-2003 : Added renderer state (DG);
 * 10-Feb-2004 : Updated state object and changed drawItem() method to make 
 *               overriding easier (DG);
 * 25-Feb-2004 : Replaced CrosshairInfo with CrosshairState.  Renamed 
 *               XYToolTipGenerator --> XYItemLabelGenerator (DG);
 * 15-Jul-2004 : Switched getX() with getXValue() and getY() with 
 *               getYValue() (DG);
 * 10-Sep-2004 : Removed getRangeType() method (DG);
 * 11-Nov-2004 : Now uses ShapeUtilities to translate shapes (DG);
 * 06-Jan-2005 : Override equals() (DG);
 * 07-Jan-2005 : Update for method name changes in DatasetUtilities (DG);
 * 28-Mar-2005 : Use getXValue() and getYValue() from dataset (DG);
 * 
 */

package org.jfree.chart.renderer.xy;

import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Point;
import java.awt.Polygon;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;
import java.util.Stack;

import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.entity.XYItemEntity;
import org.jfree.chart.labels.XYToolTipGenerator;
import org.jfree.chart.plot.CrosshairState;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.urls.XYURLGenerator;
import org.jfree.data.Range;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.data.xy.TableXYDataset;
import org.jfree.data.xy.XYDataset;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PublicCloneable;
import org.jfree.util.ShapeUtilities;

/**
 * A stacked area renderer for the {@link XYPlot} class.
 */
public class StackedXYAreaRenderer extends XYAreaRenderer 
                                   implements Cloneable, 
                                              PublicCloneable,
                                              Serializable {
    
    /** For serialization. */
    private static final long serialVersionUID = 5217394318178570889L;
     
     /**
     * A state object for use by this renderer.
     */
    static class StackedXYAreaRendererState extends XYItemRendererState {
        
        /** The area for the current series. */
        private Polygon seriesArea;
        
        /** The line. */
        private Line2D line;
        
        /** The points from the last series. */
        private Stack lastSeriesPoints;
        
        /** The points for the current series. */
        private Stack currentSeriesPoints;
        
        /**
         * Creates a new state for the renderer.
         * 
         * @param info  the plot rendering info.
         */
        public StackedXYAreaRendererState(PlotRenderingInfo info) {
            super(info);
            this.seriesArea = null;
            this.line = null;
            this.lastSeriesPoints = new Stack();
            this.currentSeriesPoints = null;
        }
        
        /**
         * Returns the series area.
         * 
         * @return The series area.
         */
        public Polygon getSeriesArea() {
            return this.seriesArea;
        }
        
        /**
         * Sets the series area.
         * 
         * @param area  the area.
         */
        public void setSeriesArea(Polygon area) {
            this.seriesArea = area;
        }
        
        /**
         * Returns the working line.
         * 
         * @return The working line.
         */
        public Line2D getLine() {
            return this.line;
        }
        
        /**
         * Returns the current series points.
         * 
         * @return The current series points.
         */
        public Stack getCurrentSeriesPoints() {
            return this.currentSeriesPoints;
        }
        
        /**
         * Sets the current series points.
         * 
         * @param points  the points.
         */
        public void setCurrentSeriesPoints(Stack points) {
            this.currentSeriesPoints = points;
        }
    
        /**
         * Returns the last series points.
         * 
         * @return The last series points.
         */
        public Stack getLastSeriesPoints() {
            return this.lastSeriesPoints;
        }
        
        /**
         * Sets the last series points.
         * 
         * @param points  the points.
         */
        public void setLastSeriesPoints(Stack points) {
            this.lastSeriesPoints = points;
        }
    
    }

    /** 
     * Custom Paint for drawing all shapes, if null defaults to series shapes 
     */
    private Paint shapePaint = null;

    /** 
     * Custom Stroke for drawing all shapes, if null defaults to series 
     * strokes.
     */
    private Stroke shapeStroke = null;

    /**
     * Creates a new renderer.
     */
    public StackedXYAreaRenderer() {
        this(AREA);
    }
    /**
     * Constructs a new renderer.
     *
     * @param type  the type of the renderer.
     */
    public StackedXYAreaRenderer(int type) {
        this(type, null, null);
    }

    /**
     * Constructs a new renderer.  To specify the type of renderer, use one of 
     * the constants: <code>SHAPES</code>, <code>LINES</code>, 
     * <code>SHAPES_AND_LINES</code>, <code>AREA</code> or 
     * <code>AREA_AND_SHAPES</code>.
     *
     * @param type  the type of renderer.
     * @param labelGenerator  the tool tip generator to use (<code>null</code> 
     *                        is none).
     * @param urlGenerator  the URL generator (<code>null</code> permitted).
     */
    public StackedXYAreaRenderer(int type,
                                 XYToolTipGenerator labelGenerator, 
                                 XYURLGenerator urlGenerator) {

        super(type, labelGenerator, urlGenerator);
    }

    /**
     * Returns the paint used for rendering shapes, or <code>null</code> if 
     * using series paints.
     *
     * @return The Paint.
     */
    public Paint getShapePaint() {
        return this.shapePaint;
    }

    /**
     * Returns the stroke used for rendering shapes, or <code>null</code> if 
     * using series strokes.
     *
     * @return The stroke.
     */
    public Stroke getShapeStroke() {
        return this.shapeStroke;
    }

    /**
     * Sets the paint for rendering shapes.
     *
     * @param shapePaint  the paint (<code>null</code> permitted).
     */
    public void setShapePaint(Paint shapePaint) {
        this.shapePaint = shapePaint;
    }

    /**
     * Sets the stroke for rendering shapes.
     *
     * @param shapeStroke  the stroke (<code>null</code> permitted).
     */
    public void setShapeStroke(Stroke shapeStroke) {
        this.shapeStroke = shapeStroke;
    }

    /**
     * Initialises the renderer. This method will be called before the first
     * item is rendered, giving the renderer an opportunity to initialise any 
     * state information it wants to maintain. The renderer can do nothing if 
     * it chooses.
     *
     * @param g2  the graphics device.
     * @param dataArea  the area inside the axes.
     * @param plot  the plot.
     * @param data  the data.
     * @param info  an optional info collection object to return data back to 
     *              the caller.
     *
     * @return A state object that should be passed to subsequent calls to the 
     *         drawItem() method.
     */
    public XYItemRendererState initialise(Graphics2D g2,
                                          Rectangle2D dataArea,
                                          XYPlot plot,
                                          XYDataset data,
                                          PlotRenderingInfo info) {

        return new StackedXYAreaRendererState(info);

    }

    /**
     * Returns the number of passes required by the renderer.
     * 
     * @return 2.
     */
    public int getPassCount() {
        return 2;
    }

    /**
     * Returns the range of values the renderer requires to display all the 
     * items from the specified dataset.
     * 
     * @param dataset  the dataset (<code>null</code> permitted).
     * 
     * @return The range (<code>null</code> if the dataset is <code>null</code> 
     *         or empty).
     */
    public Range findRangeBounds(XYDataset dataset) {
        if (dataset != null) {
            return DatasetUtilities.findStackedRangeBounds(