/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2007, 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.]
 *
 * ------------------
 * GanttRenderer.java
 * ------------------
 * (C) Copyright 2003-2007, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 16-Sep-2003 : Version 1 (DG);
 * 23-Sep-2003 : Fixed Checkstyle issues (DG);
 * 21-Oct-2003 : Bar width moved into CategoryItemRendererState (DG);
 * 03-Feb-2004 : Added get/set methods for attributes (DG);
 * 12-Aug-2004 : Fixed rendering problem with maxBarWidth attribute (DG);
 * 05-Nov-2004 : Modified drawItem() signature (DG);
 * 20-Apr-2005 : Renamed CategoryLabelGenerator 
 *               --> CategoryItemLabelGenerator (DG);
 * 01-Dec-2005 : Fix for bug 1369954, drawBarOutline flag ignored (DG);
 * ------------- JFREECHART 1.0.x --------------------------------------------
 * 17-Jan-2006 : Set includeBaseInRange flag to false (DG);
 * 20-Mar-2007 : Implemented equals() and fixed serialization (DG);
 * 
 */

package org.jfree.chart.renderer.category;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Stroke;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
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.event.RendererChangeEvent;
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.data.gantt.GanttCategoryDataset;
import org.jfree.io.SerialUtilities;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.PaintUtilities;

/**
 * A renderer for simple Gantt charts.
 */
public class GanttRenderer extends IntervalBarRenderer
                           implements Serializable {
    
    /** For serialization. */
    private static final long serialVersionUID = -4010349116350119512L;
    
    /** The paint for displaying the percentage complete. */
    private transient Paint completePaint;
    
    /** The paint for displaying the incomplete part of a task. */
    private transient Paint incompletePaint;
    
    /** 
     * Controls the starting edge of the progress indicator (expressed as a 
     * percentage of the overall bar width).
     */
    private double startPercent;
    
    /**
     * Controls the ending edge of the progress indicator (expressed as a 
     * percentage of the overall bar width). 
     */
    private double endPercent;
    
    /**
     * Creates a new renderer.
     */
    public GanttRenderer() {
        super();
        setIncludeBaseInRange(false);
        this.completePaint = Color.green;
        this.incompletePaint = Color.red;
        this.startPercent = 0.35;
        this.endPercent = 0.65;
    }
    
    /**
     * Returns the paint used to show the percentage complete.
     * 
     * @return The paint (never <code>null</code>.
     * 
     * @see #setCompletePaint(Paint)
     */
    public Paint getCompletePaint() {
        return this.completePaint;
    }
    
    /**
     * Sets the paint used to show the percentage complete and sends a 
     * {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param paint  the paint (<code>null</code> not permitted).
     * 
     * @see #getCompletePaint()
     */
    public void setCompletePaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");
        }
        this.completePaint = paint;
        notifyListeners(new RendererChangeEvent(this));
    }
    
    /**
     * Returns the paint used to show the percentage incomplete.
     * 
     * @return The paint (never <code>null</code>).
     * 
     * @see #setCompletePaint(Paint)
     */
    public Paint getIncompletePaint() {
        return this.incompletePaint;
    }
    
    /**
     * Sets the paint used to show the percentage incomplete and sends a 
     * {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param paint  the paint (<code>null</code> not permitted).
     * 
     * @see #getIncompletePaint()
     */
    public void setIncompletePaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");
        }
        this.incompletePaint = paint;
        notifyListeners(new RendererChangeEvent(this));
    }
    
    /**
     * Returns the position of the start of the progress indicator, as a 
     * percentage of the bar width.
     * 
     * @return The start percent.
     * 
     * @see #setStartPercent(double)
     */
    public double getStartPercent() {
        return this.startPercent;
    }
    
    /**
     * Sets the position of the start of the progress indicator, as a 
     * percentage of the bar width.
     * 
     * @param percent  the percent.
     * 
     * @see #getStartPercent()
     */
    public void setStartPercent(double percent) {
        this.startPercent = percent;
        notifyListeners(new RendererChangeEvent(this));
    }
    
    /**
     * Returns the position of the end of the progress indicator, as a 
     * percentage of the bar width.
     * 
     * @return The end percent.
     * 
     * @see #setEndPercent(double)
     */
    public double getEndPercent() {
        return this.endPercent;
    }
    
    /**
     * Sets the position of the end of the progress indicator, as a percentage 
     * of the bar width.
     * 
     * @param percent  the percent.
     * 
     * @see #getEndPercent()
     */
    public void setEndPercent(double percent) {
        this.endPercent = percent;
        notifyListeners(new RendererChangeEvent(this));
    }
    
    /**
     * 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 dataset  the dataset.
     * @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 dataset,
                         int row,
                         int column,
                         int pass) {

         if (dataset instanceof GanttCategoryDataset) {
             GanttCategoryDataset gcd = (GanttCategoryDataset) dataset;
             drawTasks(g2, state, dataArea, plot, domainAxis, rangeAxis, gcd, 
                     row, column);
         }
         else {  // let the superclass handle it...
             super.drawItem(g2, state, dataArea, plot, domainAxis, rangeAxis, 
                     dataset, row, column, pass);
         }
 
     }
                          
    /**
     * Draws the tasks/subtasks for one item.
     *
     * @param g2  the graphics device.
     * @param state  the renderer state.
     * @param dataArea  the data plot area.
     * @param plot  the plot.
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range axis.
     * @param dataset  the data.
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     */
    protected void drawTasks(Graphics2D g2,
                             CategoryItemRendererState state,
                             Rectangle2D dataArea,
                             CategoryPlot plot,
                             CategoryAxis domainAxis,
                             ValueAxis rangeAxis,
                             GanttCategoryDataset dataset,
                             int row,
                             int column) {

        int count = dataset.getSubIntervalCount(row, column);
        if (count == 0) {
            drawTask(g2, state, dataArea, plot, domainAxis, rangeAxis, 
                    dataset, row, column);
        }

        for (int subinterval = 0; subinterval < count; subinterval++) {
            
            RectangleEdge rangeAxisLocation = plot.getRangeAxisEdge();

            // value 0
            Number value0 = dataset.getStartValue(row, column, subinterval);
            if (value0 == null) {
                return;
            }
            double translatedValue0 = rangeAxis.valueToJava2D(
                    value0.doubleValue(), dataArea, rangeAxisLocation);
    
            // value 1
            Number value1 = dataset.getEndValue(row, column, subinterval);
            if (value1 == null) {
                return;
            }
            double translatedValue1 = rangeAxis.valueToJava2D(
                    value1.doubleValue(), dataArea, rangeAxisLocation);
    
            if (translatedValue1 < translatedValue0) {
                double temp = translatedValue1;
                translatedValue1 = translatedValue0;
                translatedValue0 = temp;
            }
    
            double rectStart = calculateBarW0(plot, plot.getOrientation(), 
                    dataArea, domainAxis, state, row, column);
            double rectLength = Math.abs(translatedValue1 - translatedValue0);
            double rectBreadth = state.getBarWidth();
    
            // DRAW THE BARS...
            Rectangle2D bar = null;
            
            if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
                bar = new Rectangle2D.Double(translatedValue0, rectStart, 
                        rectLength, rectBreadth);
            }
            else if (plot.getOrientation() == PlotOrientation.VERTICAL) {
                bar = new Rectangle2D.Double(rectStart, translatedValue0, 
                        rectBreadth, rectLength);
            }
    
            Rectangle2D completeBar = null;
            Rectangle2D incompleteBar = null;
            Number percent = dataset.getPercentComplete(row, column, 
                    subinterval);
            double start = getStartPercent();
            double end = getEndPercent();
            if (percent != null) {
                double p = percent.doubleValue();
                if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
                    completeBar = new Rectangle2D.Double(translatedValue0, 
                            rectStart + start * rectBreadth, rectLength * p, 
                            rectBreadth * (end - start));
                    incompleteBar = new Rectangle2D.Double(translatedValue0 
                            + rectLength * p, rectStart + start * rectBreadth, 
                            rectLength * (1 - p), rectBreadth * (end - start));
                }
                else if (plot.getOrientation() == PlotOrientation.VERTICAL) {
                    completeBar = new Rectangle2D.Double(rectStart + start 
                            * rectBreadth, translatedValue0 + rectLength 
                            * (1 - p), rectBreadth * (end - start), 
                            rectLength * p);
                    incompleteBar = new Rectangle2D.Double(rectStart + start 
                            * rectBreadth, translatedValue0, rectBreadth 
                            * (end - start), rectLength * (1 - p));
                }
                
            }

            Paint seriesPaint = getItemPaint(row, column);
            g2.setPaint(seriesPaint);
            g2.fill(bar);
            if (completeBar != null) {
                g2.setPaint(getCompletePaint());
                g2.fill(completeBar);
            }
            if (incompleteBar != null) {
                g2.setPaint(getIncompletePaint());
                g2.fill(incompleteBar);
            }
            if (isDrawBarOutline() 
                    && state.getBarWidth() > BAR_OUTLINE_WIDTH_THRESHOLD) {
                g2.setStroke(getItemStroke(row, column));
                g2.setPaint(getItemOutlinePaint(row, column));
                g2.draw(bar);
            }
    
            // collect entity and tool tip information...
            if (state.getInfo() != null) {
                EntityCollection entities = state.getEntityCollection();
                if (entities != null) {
                    String tip = null;
                    if (getToolTipGenerator(row, column) != null) {
                        tip = getToolTipGenerator(row, column).generateToolTip(
                                dataset, row, column);
                    }
                    String url = null;
                    if (getItemURLGenerator(row, column) != null) {
                        url = getItemURLGenerator(row, column).generateURL(
                                dataset, row, column);
                    }
                    CategoryItemEntity entity = new CategoryItemEntity(
                            bar, tip, url, dataset, dataset.getRowKey(row), 
                            dataset.getColumnKey(column));
                    entities.add(entity);
                }
            }
        }
    }
    
    /**
     * Draws a single task.
     *
     * @param g2  the graphics device.
     * @param state  the renderer state.
     * @param dataArea  the data plot area.
     * @param plot  the plot.
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range axis.
     * @param dataset  the data.
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     */
    protected void drawTask(Graphics2D g2,
                            CategoryItemRendererState state,
                            Rectangle2D dataArea,
                            CategoryPlot plot,
                            CategoryAxis domainAxis,
                            ValueAxis rangeAxis,
                            GanttCategoryDataset dataset,
                            int row,
                            int column) {

        PlotOrientation orientation = plot.getOrientation();

        RectangleEdge rangeAxisLocation = plot.getRangeAxisEdge();
        
        // Y0
        Number value0 = dataset.getEndValue(row, column);
        if (value0 == null) {
            return;
        }
        double java2dValue0 = rangeAxis.valueToJava2D(value0.doubleValue(), 
                dataArea, rangeAxisLocation);

        // Y1
        Number value1 = dataset.getStartValue(row, column);
        if (value1 == null) {
            return;
        }
        double java2dValue1 = rangeAxis.valueToJava2D(value1.doubleValue(), 
                dataArea, rangeAxisLocation);

        if (java2dValue1 < java2dValue0) {
            double temp = java2dValue1;
            java2dValue1 = java2dValue0;
            java2dValue0 = temp;
            Number tempNum = value1;
            value1 = value0;
            value0 = tempNum;
        }

        double rectStart = calculateBarW0(plot, orientation, dataArea, 
                domainAxis, state, row, column);
        double rectBreadth = state.getBarWidth();
        double rectLength = Math.abs(java2dValue1 - java2dValue0);
        
        Rectangle2D bar = null;
        if (orientation == PlotOrientation.HORIZONTAL) {
            bar = new Rectangle2D.Double(java2dValue0, rectStart, rectLength, 
                    rectBreadth);
        }
        else if (orientation == PlotOrientation.VERTICAL) {
            bar = new Rectangle2D.Double(rectStart, java2dValue1, rectBreadth, 
                    rectLength);
        }

        Rectangle2D completeBar = null;
        Rectangle2D incompleteBar = null;
        Number percent = dataset.getPercentComplete(row, column);
        double start = getStartPercent();
        double end = getEndPercent();
        if (percent != null) {
            double p = percent.doubleValue();
            if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
                completeBar = new Rectangle2D.Double(java2dValue0, 
                        rectStart + start * rectBreadth, rectLength * p, 
                        rectBreadth * (end - start));
                incompleteBar = new Rectangle2D.Double(java2dValue0 
                        + rectLength * p, rectStart + start * rectBreadth, 
                        rectLength * (1 - p), rectBreadth * (end - start));
            }
            else if (plot.getOrientation() == PlotOrientation.VERTICAL) {
                completeBar = new Rectangle2D.Double(rectStart + start 
                        * rectBreadth, java2dValue1 + rectLength * (1 - p), 
                        rectBreadth * (end - start), rectLength * p);
                incompleteBar = new Rectangle2D.Double(rectStart + start 
                        * rectBreadth, java2dValue1, rectBreadth * (end 
                        - start), rectLength * (1 - p));
            }
                
        }

        Paint seriesPaint = getItemPaint(row, column);
        g2.setPaint(seriesPaint);
        g2.fill(bar);

        if (completeBar != null) {
            g2.setPaint(getCompletePaint());
            g2.fill(completeBar);
        }
        if (incompleteBar != null) {
            g2.setPaint(getIncompletePaint());
            g2.fill(incompleteBar);
        }
        
        // draw the outline...
        if (isDrawBarOutline() 
                && state.getBarWidth() > BAR_OUTLINE_WIDTH_THRESHOLD) {
            Stroke stroke = getItemOutlineStroke(row, column);
            Paint paint = getItemOutlinePaint(row, column);
            if (stroke != null && paint != null) {
                g2.setStroke(stroke);
                g2.setPaint(paint);
                g2.draw(bar);
            }
        }
        
        CategoryItemLabelGenerator generator = getItemLabelGenerator(row, 
                column);
        if (generator != null && isItemLabelVisible(row, column)) {
            drawItemLabel(g2, dataset, row, column, plot, generator, bar, 
                    false);
        }        

        // collect entity and tool tip information...
        if (state.getInfo() != null) {
            EntityCollection entities = state.getEntityCollection();
            if (entities != null) {
                String tip = null;
                CategoryToolTipGenerator tipster = getToolTipGenerator(row, 
                        column);
                if (tipster != null) {
                    tip = tipster.generateToolTip(dataset, row, column);
                }
                String url = null;
                if (getItemURLGenerator(row, column) != null) {
                    url = getItemURLGenerator(row, column).generateURL(
                            dataset, row, column);
                }
                CategoryItemEntity entity = new CategoryItemEntity(bar, tip, 
                        url, dataset, dataset.getRowKey(row), 
                        dataset.getColumnKey(column));
                entities.add(entity);
            }
        }

    }
    
    /**
     * Tests this renderer for equality with an arbitrary object.
     * 
     * @param obj  the object (<code>null</code> permitted).
     * 
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof GanttRenderer)) {
            return false;
        }
        GanttRenderer that = (GanttRenderer) obj;
        if (!PaintUtilities.equal(this.completePaint, that.completePaint)) {
            return false;
        }
        if (!PaintUtilities.equal(this.incompletePaint, that.incompletePaint)) {
            return false;
        }
        if (this.startPercent != that.startPercent) {
            return false;
        }
        if (this.endPercent != that.endPercent) {
            return false;
        }
        return super.equals(obj);
    }
    
    /**
     * 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.completePaint, stream);
        SerialUtilities.writePaint(this.incompletePaint, 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.completePaint = SerialUtilities.readPaint(stream);
        this.incompletePaint = SerialUtilities.readPaint(stream);
    }
    
}