Bar Chart: Rotating the Category Expression

By: rwdenney5 - rwdenney5

Bar Chart: Rotating the Category Expression

2006-06-14 14:21

I've created a simple 3D bar chart but the category labels are being truncated because they are too long.

Some of JFreeChart's demos show the category lables rotated at a 45 degree angle... any idea how to do that in iReport?

Thanks,

Ryan

By: Marcelo Fernandes - mcf-rocha

RE: Bar Chart: Rotating the Category Expressi

2006-06-15 13:06

Ryan,

I think it's impossible nowadays with iReport. Although it's possible to be done using the JFreeChart in your application, there isn't such option in iReport's GUI.

You will have to create your JFreeChart outside iReport and pass it as a parameter for JasperReport to be displayed as an image.

Finally, about rotating the labels, try this on JasperReports:

final JFreeChart chart = ChartFactory.createBarChart3D(

"blablabla", // chart title

"domain", // domain axis label

"range", // range axis label

dataset, // data

PlotOrientation.HORIZONTAL, // orientation

true, // include legend

true, // tooltips

false // urls

);

final CategoryPlot plot = chart.getCategoryPlot();

final CategoryAxis axis = plot.getDomainAxis();

axis.setCategoryLabelPositions(

CategoryLabelPositions.createUpRotationLabelPositions(2*Math.PI)

);

I've been trying to find a way to fix the range axis of a a simple 3D bar chart in iReport but it's only possible in the same way.

Marcelo Carvalho Fernandes

By: rwdenney5 - rwdenney5

RE: Bar Chart: Rotating the Category Expression

2006-06-19 11:33

Thanks Marcelo. I kind of figured as much. I'm wondering though if I could use a customizer class to extend the functionality of iReport's charting. I'm assuming that the customizer class would allow access to the entire jfreechart api, but I've not been able to implement it. I'm not sure of the classpath.

Anyone have any ideas?

Thanks,

Ryan

By: Marcelo Fernandes - mcf-rocha

RE: Bar Chart: Rotating the Category Expressi

2006-06-19 11:39

You're welcome Ryan,

I have no idea about using the Customizer Class. Can you send to me the source-code of your class so that I can make some tests?

Marcelo

By: rwdenney5 - rwdenney5

RE: Bar Chart: Rotating the Category Expression

2006-06-19 13:52

I was actually just trying to test one of the samples included in the jasperreports download... jasperreports-1.2.2demosampleschartsBarChartCustomizer.java

If I can figure out how to get my chart to compile using the customizer class then I should be all set because I think I'll be able to customize the charts using the jfreechart api.

Thanks,

Ryan

Here is a Chart Customizer class that rotates 3DBarChart labels:

import java.awt.Font;

import net.sf.jasperreports.engine.JRChart;
import net.sf.jasperreports.engine.JRChartCustomizer;

import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.CategoryLabelPositions;
import org.jfree.chart.labels.ItemLabelAnchor;
import org.jfree.chart.labels.ItemLabelPosition;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.renderer.category.BarRenderer3D;
import org.jfree.ui.TextAnchor;

public class ItemStatusBarChartCustomizer implements JRChartCustomizer{

    public void customize(JFreeChart jfc, JRChart jrchart) {
        
        CategoryPlot plot = jfc.getCategoryPlot();
        CategoryAxis axis = plot.getDomainAxis();
        axis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);
        axis.setLabelFont(new Font("Verdana",Font.PLAIN, 7));
        axis.setTickLabelFont(new Font("Verdana",Font.PLAIN, 7));
        
        BarRenderer3D renderer = (BarRenderer3D) plot.getRenderer();
        renderer.setItemLabelsVisible(true);
        renderer.setPositiveItemLabelPositionFallback( 
                new ItemLabelPosition(ItemLabelAnchor.OUTSIDE10, TextAnchor.TOP_CENTER));
        renderer.setNegativeItemLabelPositionFallback( 
                new ItemLabelPosition(ItemLabelAnchor.OUTSIDE10, TextAnchor.TOP_CENTER));

        
    }
        
}

 New solution:

See labelRotation> 

http://jasperreports.sourceforge.net/schema.reference.html#plot_labelRotation

Usage: Edit in xml mode, and add the "plot" tag with labelRotation attribute. Example: