Change range of y-axis

[akhanh]

Hi,

 

i tried to change the range y-axis of a bar-chart.

i create a

'class customizer implements JRChartCustomizer'

a i tried to use it with

' // getchart

JRDesignChart i = (JRDesignChart) (jdesgn.getSummary().getElements()[0]);

i.setCustomizerClass(new customizer().toString());

'

but it do not work.

 

What i should write in

i.setCustomizerClass(new customizer().toString());

 

Thanks

Ali Baba

[svenn]

Here two links that might help you out

 

JFreeChart API

 

http://www.jfree.org/jfreechart/api/javadoc/index.html

 

forum

 

http://www.jfree.org/phpBB2/index.php

[akhanh]

Hi,

 

my problem is to find the interface to get a jfreechart from JR.

Do you know how i get it?

[svenn]

I'm not sure how you get the particular properties that you are looking to modify. I've modified different properties. I've posted the class and method that I used. Hopefully this will give you a starting point to work from.

 

Code:

public class JasperChartCustomizer extends JRAbstractChartCustomizer
{

    public void customize(JFreeChart chart, JRChart jasperChart)
    {
    	//Chart is a bar chart
    	if(jasperChart.getChartType() == JRChart.CHART_TYPE_BAR)
    	{    	}
        
    }
}

[akhanh]

HI,

this could work, but my problem is to set the customizer class.

I have a custumizer extends JRAbstractChartCustomizer

and i try to use it with

JRDesignChart i = (JRDesignChart) (jdesgn.getSummary().getElements()[0]);

i.setCustomizerClass("customizer");

but i get

Exception in thread "main" net.sf.jasperreports.engine.JRRuntimeException: Could not create chart customizer instance.

 

i dont know i set the customizer class...

[svenn]

To point to your customizer go to your chart under Chart Properties. There is a box called Customizer class. You point to your class here.

[akhanh]

Hi,

that works very fine.

 

For all a summary:

1.

create:

package tests;

 

import net.sf.jasperreports.engine.JRAbstractChartCustomizer;

import net.sf.jasperreports.engine.JRChart;

import net.sf.jasperreports.engine.JRChartCustomizer;

 

import org.jfree.chart.JFreeChart;

import org.jfree.chart.axis.NumberAxis;

import org.jfree.chart.plot.CategoryPlot;

import org.jfree.data.Range;

 

public class customizer extends JRAbstractChartCustomizer{

 

public void customize(JFreeChart jfreechart, JRChart arg1) {

// Get the plot

CategoryPlot plot = jfreechart.getCategoryPlot();

plot.getRangeAxis().setRange(10, 100);

}

 

}

 

2.: set it (see last post) in the chart the customizer class.

In my example you must write tests.customize

tests is the package name.

 

Thats all and you get a y-axis range from 10 to 100.

With the methods of plot (see above) you can change

different values of the chart

 

Ali Baba

[akhanh]

Hi,

that works very fine.

 

For all a summary:

1.

create:

package tests;

 

import net.sf.jasperreports.engine.JRAbstractChartCustomizer;

import net.sf.jasperreports.engine.JRChart;

import net.sf.jasperreports.engine.JRChartCustomizer;

 

import org.jfree.chart.JFreeChart;

import org.jfree.chart.axis.NumberAxis;

import org.jfree.chart.plot.CategoryPlot;

import org.jfree.data.Range;

 

public class customizer extends JRAbstractChartCustomizer{

 

public void customize(JFreeChart jfreechart, JRChart arg1) {

// Get the plot

CategoryPlot plot = jfreechart.getCategoryPlot();

plot.getRangeAxis().setRange(10, 100);

}

 

}

 

2.: set it (see last post) in the chart the customizer class.

In my example you must write tests.customize

tests is the package name.

 

Thats all and you get a y-axis range from 10 to 100.

With the methods of plot (see above) you can change

different values of the chart

 

Ali Baba

[akhanh]

For an administrator:

i dont know why:

if i post something one time, it create two posts.

in my last posts it create four times, but i press the submit button only one time...