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jfreechart example source code file (GroupedStackedBarRenderer.java)

This example jfreechart source code file (GroupedStackedBarRenderer.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

awt, categoryaxis, categoryaxis, categorydataset, categoryitemrendererstate, geometry, groupedstackedbarrenderer, groupedstackedbarrenderer, io, keytogroupmap, number, plotorientation, plotorientation, range, rectangle2d, rectangle2d, rectangleedge

The jfreechart GroupedStackedBarRenderer.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, 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.]
 *
 * ------------------------------
 * GroupedStackedBarRenderer.java
 * ------------------------------
 * (C) Copyright 2004-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 29-Apr-2004 : Version 1 (DG);
 * 08-Jul-2004 : Added equals() method (DG);
 * 05-Nov-2004 : Modified drawItem() signature (DG);
 * 07-Jan-2005 : Renamed getRangeExtent() --> findRangeBounds (DG);
 * 20-Apr-2005 : Renamed CategoryLabelGenerator
 *               --> CategoryItemLabelGenerator (DG);
 * 22-Sep-2005 : Renamed getMaxBarWidth() --> getMaximumBarWidth() (DG);
 * 20-Dec-2007 : Fix for bug 1848961 (DG);
 * 24-Jun-2008 : Added new barPainter mechanism (DG);
 *
 */

package org.jfree.chart.renderer.category;

import java.awt.Graphics2D;
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.EntityCollection;
import org.jfree.chart.event.RendererChangeEvent;
import org.jfree.chart.labels.CategoryItemLabelGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.KeyToGroupMap;
import org.jfree.data.Range;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.PublicCloneable;

/**
 * A renderer that draws stacked bars within groups.  This will probably be
 * merged with the {@link StackedBarRenderer} class at some point.  The example
 * shown here is generated by the <code>StackedBarChartDemo4.java
 * program included in the JFreeChart Demo Collection:
 * <br>
* <img src="../../../../../images/GroupedStackedBarRendererSample.png" * alt="GroupedStackedBarRendererSample.png" /> */ public class GroupedStackedBarRenderer extends StackedBarRenderer implements Cloneable, PublicCloneable, Serializable { /** For serialization. */ private static final long serialVersionUID = -2725921399005922939L; /** 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, and sends a * {@link RendererChangeEvent} to all registered listeners. * * @param map the map (<code>null not permitted). */ public void setSeriesToGroupMap(KeyToGroupMap map) { if (map == null) { throw new IllegalArgumentException("Null 'map' argument."); } this.seriesToGroupMap = map; fireChangeEvent(); } /** * Returns the range of values the renderer requires to display all the * items from the specified dataset. * * @param dataset the dataset (<code>null permitted). * * @return The range (or <code>null if the dataset is * <code>null or empty). */ public Range findRangeBounds(CategoryDataset dataset) { if (dataset == null) { return null; } Range r = DatasetUtilities.findStackedRangeBounds( dataset, this.seriesToGroupMap); return r; } /** * Calculates the bar width and stores it in the renderer state. We * override the method in the base class to take account of the * series-to-group mapping. * * @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 * getMaximumBarWidth(); 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( plot.getIndexOf(this)).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). * @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) { // 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); 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; boolean positive = (value > 0.0); boolean inverted = rangeAxis.isInverted(); RectangleEdge barBase; if (orientation == PlotOrientation.HORIZONTAL) { if (positive && inverted || !positive && !inverted) { barBase = RectangleEdge.RIGHT; } else { barBase = RectangleEdge.LEFT; } } else { if (positive && !inverted || !positive && inverted) { barBase = RectangleEdge.BOTTOM; } else { barBase = RectangleEdge.TOP; } } 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); } getBarPainter().paintBar(g2, this, row, column, bar, barBase); CategoryItemLabelGenerator generator = getItemLabelGenerator(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.getEntityCollection(); if (entities != null) { addItemEntity(entities, dataset, row, column, bar); } } } /** * Tests this renderer for equality with an arbitrary object. * * @param obj the object (<code>null permitted). * * @return A boolean. */ public boolean equals(Object obj) { if (obj == this) { return true; } if (!(obj instanceof GroupedStackedBarRenderer)) { return false; } GroupedStackedBarRenderer that = (GroupedStackedBarRenderer) obj; if (!this.seriesToGroupMap.equals(that.seriesToGroupMap)) { return false; } return super.equals(obj); } }

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