groupedstackedbarrenderer.java

这是一个segy数据显示程序

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2004, 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.]
 *
 * ------------------------------
 * GroupedStackedBarRenderer.java
 * ------------------------------
 * (C) Copyright 2004, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: GroupedStackedBarRenderer.java,v 1.3 2004/05/10 16:49:02 mungady Exp $
 *
 * Changes
 * -------
 * 29-Apr-2004 : Version 1 (DG);
 * 
 */
package org.jfree.chart.renderer;

import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.geom.Rectangle2D;

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.CategoryLabelGenerator;
import org.jfree.chart.labels.CategoryToolTipGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.CategoryDataset;
import org.jfree.data.DatasetUtilities;
import org.jfree.data.KeyToGroupMap;
import org.jfree.data.Range;
import org.jfree.ui.RectangleEdge;

/**
 * A renderer that draws stacked bars within groups.  This will probably be merged with 
 * the {@link StackedBarRenderer} class at some point.
 */
public class GroupedStackedBarRenderer extends StackedBarRenderer {
    
    /** A map used to assign each series to a group. */
    private KeyToGroupMap seriesToGroupMap;
    
    /**
     * Creates a new renderer.
     */
    public GroupedStackedBarRenderer() {
        super();
        this.seriesToGroupMap = new KeyToGroupMap();
    }
    
    /**
     * Updates the map used to assign each series to a group.
     * 
     * @param map  the map (<code>null</code> not permitted).
     */
    public void setSeriesToGroupMap(KeyToGroupMap map) {
        if (map == null) {
            throw new IllegalArgumentException("Null 'map' argument.");   
        }
        this.seriesToGroupMap = map;   
        notifyListeners(new RendererChangeEvent(this));
    }
    
    /**
     * 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 (or <code>null</code> if the dataset is <code>null</code> or empty).
     */
    public Range getRangeExtent(CategoryDataset dataset) {
        Range r =  DatasetUtilities.getStackedRangeExtent(dataset, this.seriesToGroupMap);
        return r;
    }

    /**
     * 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 xAxis = plot.getDomainAxisForDataset(rendererIndex);
        CategoryDataset data = plot.getDataset(rendererIndex);
        if (data != null) {
            PlotOrientation orientation = plot.getOrientation();
            double space = 0.0;
            if (orientation == PlotOrientation.HORIZONTAL) {
                space = dataArea.getHeight();
            }
            else if (orientation == PlotOrientation.VERTICAL) {
                space = dataArea.getWidth();
            }
            double maxWidth = space * getMaxBarWidth();
            int groups = this.seriesToGroupMap.getGroupCount();
            int categories = data.getColumnCount();
            int columns = groups * categories;
            double categoryMargin = 0.0;
            double itemMargin = 0.0;
            if (categories > 1) {
                categoryMargin = xAxis.getCategoryMargin();
            }
            if (groups > 1) {
                itemMargin = getItemMargin();   
            }

            double used = space * (1 - xAxis.getLowerMargin() - xAxis.getUpperMargin()
                                     - categoryMargin - itemMargin);
            if (columns > 0) {
                state.setBarWidth(Math.min(used / columns, maxWidth));
            }
            else {
                state.setBarWidth(Math.min(used, maxWidth));
            }
        }

    }

    /**
     * Calculates the coordinate of the first "side" of a bar.  This will be the minimum 
     * x-coordinate for a vertical bar, and the minimum y-coordinate for a horizontal bar.
     * 
     * @param plot  the plot.
     * @param orientation  the plot orientation.
     * @param dataArea  the data area.
     * @param domainAxis  the domain axis.
     * @param state  the renderer state (has the bar width precalculated).
     * @param row  the row index.
     * @param column  the column index.
     * 
     * @return the coordinate.
     */
    protected double calculateBarW0(CategoryPlot plot, 
                                    PlotOrientation orientation, 
                                    Rectangle2D dataArea,
                                    CategoryAxis domainAxis,
                                    CategoryItemRendererState state,
                                    int row,
                                    int column) {
        // calculate bar width...
        double space = 0.0;
        if (orientation == PlotOrientation.HORIZONTAL) {
            space = dataArea.getHeight();
        }
        else {
            space = dataArea.getWidth();
        }
        double barW0 = domainAxis.getCategoryStart(
            column, getColumnCount(), dataArea, plot.getDomainAxisEdge()
        );
        int groupCount = this.seriesToGroupMap.getGroupCount();
        int groupIndex = this.seriesToGroupMap.getGroupIndex(
            this.seriesToGroupMap.getGroup(plot.getDataset().getRowKey(row))
        );
        int categoryCount = getColumnCount();
        if (groupCount > 1) {
            double groupGap = space * getItemMargin() / (categoryCount * (groupCount - 1));
            double groupW = calculateSeriesWidth(space, domainAxis, categoryCount, groupCount);
            barW0 = barW0 + groupIndex * (groupW + groupGap) 
                          + (groupW / 2.0) - (state.getBarWidth() / 2.0);
        }
        else {
            barW0 = domainAxis.getCategoryMiddle(
                column, getColumnCount(), dataArea, plot.getDomainAxisEdge()
            ) - state.getBarWidth() / 2.0;
        }
        return barW0;
    }
    
    /**
     * Draws a stacked bar for a specific item.
     *
     * @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 dataset  the data.
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     */
    public void drawItem(Graphics2D g2,
                         CategoryItemRendererState state,
                         Rectangle2D dataArea,
                         CategoryPlot plot,
                         CategoryAxis domainAxis,
                         ValueAxis rangeAxis,
                         CategoryDataset dataset,
                         int row,
                         int column) {
     
        // nothing is drawn for null values...
        Number dataValue = dataset.getValue(row, column);
        if (dataValue == null) {
            return;
        }
        
        double value = dataValue.doubleValue();
        Comparable group = this.seriesToGroupMap.getGroup(dataset.getRowKey(row));
        PlotOrientation orientation = plot.getOrientation();
        double barW0 = calculateBarW0(plot, orientation, dataArea, domainAxis, state, row, column);
        
//        = domainAxis.getCategoryMiddle(
//            column * this.seriesToGroupMap.getGroupCount() 
//            + this.seriesToGroupMap.getGroupIndex(group), 
//            columnCount, dataArea, plot.getDomainAxisEdge()
//        ) - state.getBarWidth() / 2.0;

        double positiveBase = 0.0;
        double negativeBase = 0.0;

        for (int i = 0; i < row; i++) {
            if (group.equals(this.seriesToGroupMap.getGroup(dataset.getRowKey(i)))) {
                Number v = dataset.getValue(i, column);
                if (v != null) {
                    double d = v.doubleValue();
                    if (d > 0) {
                        positiveBase = positiveBase + d;
                    }
                    else {
                        negativeBase = negativeBase + d;
                    }
                }
            }
        }

        double translatedBase;
        double translatedValue;
        RectangleEdge location = plot.getRangeAxisEdge();
        if (value > 0.0) {
            translatedBase = rangeAxis.valueToJava2D(positiveBase, dataArea, location);
            translatedValue = rangeAxis.valueToJava2D(positiveBase + value, dataArea, location);
        }
        else {
            translatedBase = rangeAxis.valueToJava2D(negativeBase, dataArea, location);
            translatedValue = rangeAxis.valueToJava2D(negativeBase + value, dataArea, location);
        }
        double barL0 = Math.min(translatedBase, translatedValue);
        double barLength = Math.max(
            Math.abs(translatedValue - translatedBase), getMinimumBarLength()
        );

        Rectangle2D bar = null;
        if (orientation == PlotOrientation.HORIZONTAL) {
            bar = new Rectangle2D.Double(barL0, barW0, barLength, state.getBarWidth());
        }
        else {
            bar = new Rectangle2D.Double(barW0, barL0, state.getBarWidth(), barLength);
        }
        Paint itemPaint = getItemPaint(row, column);
        if (getGradientPaintTransformer() != null && itemPaint instanceof GradientPaint) {
            GradientPaint gp = (GradientPaint) itemPaint;
            itemPaint = getGradientPaintTransformer().transform(gp, bar);
        }
        g2.setPaint(itemPaint);
        g2.fill(bar);
        if (isDrawBarOutline() && state.getBarWidth() > BAR_OUTLINE_WIDTH_THRESHOLD) {
            g2.setStroke(getItemStroke(row, column));
            g2.setPaint(getItemOutlinePaint(row, column));
            g2.draw(bar);
        }

        CategoryLabelGenerator generator = getLabelGenerator(row, column);
        if (generator != null && isItemLabelVisible(row, column)) {
            drawItemLabel(g2, dataset, row, column, plot, generator, bar, (value < 0.0));
        }        
                
        // collect entity and tool tip information...
        if (state.getInfo() != null) {
            EntityCollection entities = state.getInfo().getOwner().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, row, dataset.getColumnKey(column), column
                );
                entities.addEntity(entity);
            }
        }
        
    }
   
}