/* ===========================================================
* 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.]
*
* -----------------------
* StackedBarRenderer.java
* -----------------------
* (C) Copyright 2000-2004, by Object Refinery Limited and Contributors.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): Richard Atkinson;
* Thierry Saura;
* Christian W. Zuckschwerdt;
*
* $Id: StackedBarRenderer.java,v 1.1 2004/08/31 14:47:49 mungady Exp $
*
* Changes
* -------
* 19-Oct-2001 : Version 1 (DG);
* 22-Oct-2001 : Renamed DataSource.java --> Dataset.java etc. (DG);
* 23-Oct-2001 : Changed intro and trail gaps on bar plots to use percentage of available space
* rather than a fixed number of units (DG);
* 15-Nov-2001 : Modified to allow for null data values (DG);
* 22-Nov-2001 : Modified to allow for negative data values (DG);
* 13-Dec-2001 : Added tooltips (DG);
* 16-Jan-2002 : Fixed bug for single category datasets (DG);
* 15-Feb-2002 : Added isStacked() method (DG);
* 14-Mar-2002 : Modified to implement the CategoryItemRenderer interface (DG);
* 24-May-2002 : Incorporated tooltips into chart entities (DG);
* 11-Jun-2002 : Added check for (permitted) null info object, bug and fix reported by David
* Basten. Also updated Javadocs. (DG);
* 25-Jun-2002 : Removed redundant import (DG);
* 26-Jun-2002 : Small change to entity (DG);
* 05-Aug-2002 : Small modification to drawCategoryItem method to support URLs for HTML image
* maps (RA);
* 08-Aug-2002 : Added optional linking lines, contributed by Thierry Saura (DG);
* 26-Sep-2002 : Fixed errors reported by Checkstyle (DG);
* 24-Oct-2002 : Amendments for changes in CategoryDataset interface and CategoryToolTipGenerator
* interface (DG);
* 05-Nov-2002 : Replaced references to CategoryDataset with TableDataset (DG);
* 26-Nov-2002 : Replaced isStacked() method with getRangeType() method (DG);
* 17-Jan-2003 : Moved plot classes to a separate package (DG);
* 25-Mar-2003 : Implemented Serializable (DG);
* 12-May-2003 : Merged horizontal and vertical stacked bar renderers (DG);
* 30-Jul-2003 : Modified entity constructor (CZ);
* 08-Sep-2003 : Fixed bug 799668 (isBarOutlineDrawn() ignored) (DG);
* 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
* 21-Oct-2003 : Moved bar width into renderer state (DG);
* 26-Nov-2003 : Added code to respect maxBarWidth attribute (DG);
*
*/
package org.jfree.chart.renderer.category;
import java.awt.Graphics2D;
import java.awt.Paint;
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.CategoryLabelGenerator;
import org.jfree.chart.labels.CategoryToolTipGenerator;
import org.jfree.chart.labels.ItemLabelAnchor;
import org.jfree.chart.labels.ItemLabelPosition;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
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.ui.TextAnchor;
import org.jfree.util.PublicCloneable;
/**
* A stacked bar renderer for use with the {@link org.jfree.chart.plot.CategoryPlot} class.
*
*/
public class StackedBarRenderer extends BarRenderer
implements Cloneable, PublicCloneable, Serializable {
/**
* Creates a new renderer with no tool tip generator and no URL generator.
* <P>
* The defaults (no tool tip or URL generators) have been chosen to minimise the processing
* required to generate a default chart. If you require tool tips or URLs, then you can
* easily add the required generators.
*/
public StackedBarRenderer() {
super();
// set the default item label positions, which will only be used if the user
// requests visible item labels...
ItemLabelPosition p = new ItemLabelPosition(
ItemLabelAnchor.CENTER, TextAnchor.CENTER
);
setBasePositiveItemLabelPosition(p);
setBaseNegativeItemLabelPosition(p);
setPositiveItemLabelPositionFallback(null);
setNegativeItemLabelPositionFallback(null);
}
/**
* 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 empty).
*/
public Range getRangeExtent(CategoryDataset dataset) {
return DatasetUtilities.findStackedRangeExtent(dataset);
}
/**
* 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 columns = data.getColumnCount();
double categoryMargin = 0.0;
if (columns > 1) {
categoryMargin = xAxis.getCategoryMargin();
}
double used = space * (1 - xAxis.getLowerMargin() - xAxis.getUpperMargin()
- categoryMargin);
if (columns > 0) {
state.setBarWidth(Math.min(used / columns, maxWidth));
}
else {
state.setBarWidth(Math.min(used, maxWidth));
}
}
}
/**
* 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();
PlotOrientation orientation = plot.getOrientation();
double barW0 = domainAxis.getCategoryMiddle(
column, getColumnCount(), dataArea, plot.getDomainAxisEdge()
) - state.getBarWidth() / 2.0;
double positiveBase = 0.0;
double negativeBase = 0.0;
for (int i = 0; i < row; 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 seriesPaint = getItemPaint(row, column);
g2.setPaint(seriesPaint);
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);
}
}
}
}