/* ===========================================================
 * 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., 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.]
 *
 * -----------------------
 * LayeredBarRenderer.java
 * -----------------------
 * (C) Copyright 2003-2005, by Arnaud Lelievre and Contributors.
 *
 * Original Author:  Arnaud Lelievre (for Garden);
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * Changes
 * -------
 * 28-Aug-2003 : Version 1 (AL);
 * 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
 * 07-Oct-2003 : Added renderer state (DG);
 * 21-Oct-2003 : Bar width moved to renderer state (DG);
 * 05-Nov-2004 : Modified drawItem() signature (DG);
 * 20-Apr-2005 : Renamed CategoryLabelGenerator 
 *               --> CategoryItemLabelGenerator (DG);
 * 17-Nov-2005 : Added support for gradient paint (DG);
 *
 */

package org.jfree.chart.renderer.category;

import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Stroke;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;

import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.CategoryItemEntity;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.labels.CategoryItemLabelGenerator;
import org.jfree.chart.labels.CategoryToolTipGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.CategoryDataset;
import org.jfree.ui.GradientPaintTransformer;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.ObjectList;

/**
 * A {@link CategoryItemRenderer} that represents data using bars which are 
 * superimposed.
 *
 * @author Arnaud Lelievre
 */
public class LayeredBarRenderer extends BarRenderer 
                                implements Serializable {
    
    /** For serialization. */
    private static final long serialVersionUID = -8716572894780469487L;

    /** A list of the width of each series bar. */
    protected ObjectList seriesBarWidthList;

    /**
     * Default constructor.
     */
    public LayeredBarRenderer() {
        super();
        this.seriesBarWidthList = new ObjectList();
    }

    /**
     * Returns the bar width for a series, or <code>Double.NaN</code> if no
     * width has been set.
     *
     * @param series  the series index (zero based).
     *
     * @return The width for the series (1.0=100%, it is the maximum).
     */
    public double getSeriesBarWidth(int series) {
        double result = Double.NaN;
        Number n = (Number) this.seriesBarWidthList.get(series);
        if (n != null) {
            result = n.doubleValue();
        }
        return result;
    }

    /**
     * Sets the width of the bars of a series.
     *
     * @param series  the series index (zero based).
     * @param width  the width of the series bar in percentage (1.0=100%, it is 
     *               the maximum).
     */ 
    public void setSeriesBarWidth(int series, double width) {
        this.seriesBarWidthList.set(series, new Double(width));
    }

    /**
     * Calculates the bar width and stores it in the renderer state.
     * 
     * @param plot  the plot.
     * @param dataArea  the data area.
     * @param rendererIndex  the renderer index.
     * @param state  the renderer state.
     */
    protected void calculateBarWidth(CategoryPlot plot, 
                                     Rectangle2D dataArea, 
                                     int rendererIndex,
                                     CategoryItemRendererState state) {

        // calculate the bar width
        CategoryAxis domainAxis = getDomainAxis(plot, rendererIndex);
        CategoryDataset dataset = plot.getDataset(rendererIndex);
        if (dataset != null) {
            int columns = dataset.getColumnCount();
            int rows = dataset.getRowCount();
            double space = 0.0;
            PlotOrientation orientation = plot.getOrientation();
            if (orientation == PlotOrientation.HORIZONTAL) {
                space = dataArea.getHeight();
            }
            else if (orientation == PlotOrientation.VERTICAL) {
                space = dataArea.getWidth();
            }
            double categoryMargin = 0.0;
            if (columns > 1) {
                categoryMargin = domainAxis.getCategoryMargin();
            }
            double used = space * (1 - domainAxis.getLowerMargin() 
                - domainAxis.getUpperMargin() - categoryMargin);
            if ((rows * columns) > 0) {
                state.setBarWidth(used / (dataset.getColumnCount()));
            } 
            else {
                state.setBarWidth(used);
            }
        }
    }

    /**
     * Draws the bar for one item in the dataset.
     *
     * @param g2  the graphics device.
     * @param state  the renderer state.
     * @param dataArea  the plot area.
     * @param plot  the plot.
     * @param domainAxis  the domain (category) axis.
     * @param rangeAxis  the range (value) axis.
     * @param data  the data.
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     * @param pass  the pass index.
     */
    public void drawItem(Graphics2D g2,
                         CategoryItemRendererState state,
                         Rectangle2D dataArea,
                         CategoryPlot plot,
                         CategoryAxis domainAxis,
                         ValueAxis rangeAxis,
                         CategoryDataset data,
                         int row,
                         int column,
                         int pass) {

        PlotOrientation orientation = plot.getOrientation();
        if (orientation == PlotOrientation.HORIZONTAL) {
            drawHorizontalItem(g2, state, dataArea, plot, domainAxis, rangeAxis, 
                data, row, column);
        }
        else if (orientation == PlotOrientation.VERTICAL) {
            drawVerticalItem(g2, state, dataArea, plot, domainAxis, rangeAxis, 
                data, row, column);
        }

    }

    /**
     * Draws the bar for a single (series, category) data item.
     *
     * @param g2  the graphics device.
     * @param state  the renderer state.
     * @param dataArea  the data area.
     * @param plot  the plot.
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range axis.
     * @param data  the data.
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     */
    protected void drawHorizontalItem(Graphics2D g2,
                                      CategoryItemRendererState state,
                                      Rectangle2D dataArea,
                                      CategoryPlot plot,
                                      CategoryAxis domainAxis,
                                      ValueAxis rangeAxis,
                                      CategoryDataset data,
                                      int row,
                                      int column) {

        // nothing is drawn for null values...
        Number dataValue = data.getValue(row, column);
        if (dataValue == null) {
            return;
        }

        // X
        double value = dataValue.doubleValue();
        double base = 0.0;
        double lclip = getLowerClip();
        double uclip = getUpperClip();
        if (uclip <= 0.0) {  // cases 1, 2, 3 and 4
            if (value >= uclip) {
                return; // bar is not visible
            }
            base = uclip;
            if (value <= lclip) {
                value = lclip;
            }
        }
        else if (lclip <= 0.0) { // cases 5, 6, 7 and 8
            if (value >= uclip) {
                value = uclip;
            }