How to properly override generateToolTip() ?

[alexpgh]

I am trying to override generateToolTip() of StandardCategoryToolTipGenerator class (the code below). But, when I try to use it, it seems like parent class's generateToolTip() is called (i.e. my System.out.println statement is never executed).
Anyone seen this problem before?
Thanks!

//Here is how I use it:
final BarRenderer renderer = new BarRenderer();
renderer.setToolTipGenerator(new MyTooltipGenerator());

//Here is my implementation
class MyTooltipGenerator extends StandardCategoryToolTipGenerator
{


public String generateToolTip(CategoryDataset dataset,
int series,
int category) {

System.out.println("Calling generateToolTip");
String result = null;
Number value = dataset.getValue(series, category);
if (value != null) {
result = "Alex Test";
}
return result;

}


};

[david.gilbert]

It looks OK. Are you sure the renderer has been 'set' on the plot?

[alexpgh]

here's the complete code how is renderer set on the plot:

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.ArrayList;


import org.jfree.chart.ChartColor;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartRenderingInfo;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.labels.StandardCategoryToolTipGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.BarRenderer;
import org.jfree.chart.renderer.category.CategoryItemRenderer;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.data.time.Day;
import org.jfree.date.SerialDate;
import org.jfree.chart.labels.CustomXYToolTipGenerator;

import org.jfree.chart.urls.StandardCategoryURLGenerator;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.general.DatasetUtilities;

/**
* A demo showing how to create an HTML image map for a bar chart.
*/
public class ImageMapDemo1 {

/**
* Default constructor.
*/
public ImageMapDemo1() {
super();
}

/**
* Starting point for the demo.
*
* @param args ignored.
*/
public static void main(final String[] args) {



// initialise the data...
final DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.setValue(new Long(1), "Inspection", "German");
dataset.setValue(new Long(1), "Inspection", "Japanese");
dataset.setValue(new Long(1), "Inspection", "Italian");
dataset.setValue(new Long(2), "Editing", "German");
dataset.setValue(new Long(2), "Editing", "Japanese");
dataset.setValue(new Long(2), "Editing", "Italian");
dataset.setValue(new Long(3), "Proofreading", "Italian");




JFreeChart chart = null;


final CategoryAxis categoryAxis = new CategoryAxis("Category");
final ValueAxis valueAxis = new NumberAxis("Value");
final BarRenderer renderer = new BarRenderer();
//renderer.setToolTipGenerator(new StandardCategoryToolTipGenerator());
renderer.setToolTipGenerator(new MyTooltipGenerator());


renderer.setItemURLGenerator(new StandardCategoryURLGenerator("bar_chart_detail.jsp"));

final CategoryPlot plot = new CategoryPlot(dataset, categoryAxis, valueAxis, renderer);
plot.setOrientation(PlotOrientation.VERTICAL);




// chart = new JFreeChart("Bar Chart", JFreeChart.DEFAULT_TITLE_FONT, plot, true);
chart = ChartFactory.createStackedBarChart3D(
"Vertical Bar Chart", // chart title
"Category", // domain axis label
"Value", // range axis label
dataset, // data
PlotOrientation.HORIZONTAL,
true, // include legend
true,
true
);

chart.setBackgroundPaint(java.awt.Color.white);

// ****************************************************************************
// * JFREECHART DEVELOPER GUIDE *
// * The JFreeChart Developer Guide, written by David Gilbert, is available *
// * to purchase from Object Refinery Limited: *
// * *
*
// * Sales are used to provide funding for the JFreeChart project - please *
// * support us so that we can continue developing free software. *
// ****************************************************************************

// save it to an image
try {
final ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
final File file1 = new File("barchart100.jpg");
ChartUtilities.saveChartAsJPEG(file1, chart, 600, 400, info);

// write an HTML page incorporating the image with an image map
final File file2 = new File("barchart100.html");
final OutputStream out = new BufferedOutputStream(new FileOutputStream(file2));
final PrintWriter writer = new PrintWriter(out);
writer.println("<HTML>");
writer.println("<HEAD><TITLE>JFreeChart Image Map Demo</TITLE></HEAD>");
writer.println("<BODY>");
ChartUtilities.writeImageMap(writer, "chart", info, false);
writer.println("<IMG SRC=\"barchart100.jpg\" "
+ "WIDTH=\"600\" HEIGHT=\"400\" BORDER=\"0\" USEMAP=\"#chart\">");
writer.println("</BODY>");
writer.println("</HTML>");
writer.close();

}
catch (IOException e) {
System.out.println(e.toString());
}

}

}

[david.gilbert]

The renderer you've customised is not part of the chart you end up drawing.

[alexpgh]

thanks, that fixed it. But, I still have a problem. Now, my customized method is being called, but the tooltip is not being showed on the JPG created....

Here's the changed code:

/* ===========================================================
* 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.]
*
* ------------------
* ImageMapDemo1.java
* ------------------
* (C) Copyright 2002-2004, by Object Refinery Limited and Contributors.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): Richard Atkinson (richard_c_atkinson@ntlworld.com);
*
* $Id: ImageMapDemo1.java,v 1.26 2004/05/10 16:45:23 mungady Exp $
*
* Changes
* -------
* 26-Jun-2002 : Version 1 (DG);
* 05-Aug-2002 : Modified to demonstrate hrefs and alt tags in image map (RA);
* 10-Oct-2002 : Fixed errors reported by Checkstyle (DG);
*
*/


import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.ArrayList;


import org.jfree.chart.ChartColor;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartRenderingInfo;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.labels.StandardCategoryToolTipGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.StackedBarRenderer3D;
import org.jfree.chart.renderer.category.CategoryItemRenderer;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.data.time.Day;
import org.jfree.date.SerialDate;
import org.jfree.chart.labels.CustomXYToolTipGenerator;

import org.jfree.chart.urls.StandardCategoryURLGenerator;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.general.DatasetUtilities;

/**
* A demo showing how to create an HTML image map for a bar chart.
*/
public class ImageMapDemo1 {

/**
* Default constructor.
*/
public ImageMapDemo1() {
super();
}

/**
* Starting point for the demo.
*
* @param args ignored.
*/
public static void main(final String[] args) {

// create a chart
/* final double[][] data = new double[][] {
{56.0, 5, 34.0, 76.0, 56.0, 100.0, 67.0, 45.0},
{37.0, 45.0, 67.0, 25.0, 34.0, 34.0, 100.0, 53.0},
{43.0, 54.0, 34.0, 34.0, 87.0, 64.0, 73.0, 12.0}
};*/

// initialise the data...
final DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.setValue(new Long(1), "Inspection", "German");
dataset.setValue(new Long(1), "Inspection", "Japanese");
dataset.setValue(new Long(1), "Inspection", "Italian");
dataset.setValue(new Long(2), "Editing", "German");
dataset.setValue(new Long(2), "Editing", "Japanese");
dataset.setValue(new Long(2), "Editing", "Italian");
dataset.setValue(new Long(3), "Proofreading", "Italian");


/*final CategoryDataset dataset = DatasetUtilities.createCategoryDataset(
xLabels, yLabels, data
);*/

JFreeChart chart = null;


final CategoryAxis categoryAxis = new CategoryAxis("Category");
final ValueAxis valueAxis = new NumberAxis("Value");

//renderer.setToolTipGenerator(new StandardCategoryToolTipGenerator());
// renderer.setToolTipGenerator(new MyTooltipGenerator());

//renderer.setItemLabelGenerator(new MyCategoryItemLabelGenerator());

// renderer.setItemURLGenerator(new StandardCategoryURLGenerator("bar_chart_detail.jsp"));

// final CategoryPlot plot = new CategoryPlot(dataset, categoryAxis, valueAxis, renderer);
// plot.setOrientation(PlotOrientation.HORIZONTAL);




// chart = new JFreeChart("Bar Chart", JFreeChart.DEFAULT_TITLE_FONT, plot, true);
chart = ChartFactory.createStackedBarChart3D(
"Vertical Bar Chart", // chart title
"Category", // domain axis label
"Value", // range axis label
dataset, // data
PlotOrientation.HORIZONTAL,
true, // include legend
true,
true
);

final CategoryPlot plot = chart.getCategoryPlot();
final StackedBarRenderer3D renderer = new StackedBarRenderer3D();
renderer.setToolTipGenerator(new MyTooltipGenerator());
renderer.setItemLabelGenerator(new MyCategoryItemLabelGenerator());
renderer.setItemURLGenerator(new StandardCategoryURLGenerator(""));
plot.setRenderer(renderer);

chart.setBackgroundPaint(java.awt.Color.white);

// ****************************************************************************
// * JFREECHART DEVELOPER GUIDE *
// * The JFreeChart Developer Guide, written by David Gilbert, is available *
// * to purchase from Object Refinery Limited: *
// * *
// * http://www.object-refinery.com/jfreechart/guide.html *
// * *
// * Sales are used to provide funding for the JFreeChart project - please *
// * support us so that we can continue developing free software. *
// ****************************************************************************

// save it to an image
try {
final ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
final File file1 = new File("barchart100.jpg");
ChartUtilities.saveChartAsJPEG(file1, chart, 600, 400, info);

// write an HTML page incorporating the image with an image map
final File file2 = new File("barchart100.html");
final OutputStream out = new BufferedOutputStream(new FileOutputStream(file2));
final PrintWriter writer = new PrintWriter(out);
writer.println("<HTML>");
writer.println("<HEAD><TITLE>JFreeChart Image Map Demo</TITLE></HEAD>");
writer.println("<BODY>");



/*writeImageMap(writer,
"chart",
info,
ToolTipTagFragmentGenerator toolTipTagFragmentGenerator,
URLTagFragmentGenerator urlTagFragmentGenerator)
*/
//ChartUtilities.writeImageMap(writer, "chart", info, false);
writer.println("<IMG SRC=\"barchart100.jpg\" "
+ "WIDTH=\"600\" HEIGHT=\"400\" BORDER=\"0\" USEMAP=\"#chart\">");
writer.println("</BODY>");
writer.println("</HTML>");
writer.close();

}
catch (IOException e) {
System.out.println(e.toString());
}

}




}

[alexpgh]

Ignore my previous message, my ImageMap write() method was commented out.

Thanks, this fixed my problem.