How can I adjust the font of the label of the bar?

[flhs]

Hi All

I'm using ireport to design a bar chart, I want to show the value above each bar, but the value of the tallest bar only can be displayed half, and if the value reach four digits, they will cover each other. I didn't find any parameter about it, who can help me?

The attachment is the issue pic.

 

Regards!

Samuel size=345]http://www.jasperforge.org/components/com_joomlaboard/uploaded/images/ireport1.GIF

[flhs]

The second pic:

size=340]http://www.jasperforge.org/components/com_joomlaboard/uploaded/images/ireport2.GIF

[flhs]

Can anybody help me?

[mmflynn]

I can set you in the right direction, but unfortunately I do not have a specific solution for you. JFreeChart is the chart engine used by JasperReports. iReport does not expose all the capabilities of JFreeChart yet, so you need to write a chart customizer class to get the functionality you need, specifically rendering the value labels differently.

These should get you started:

• Search this forum for JRChartCustomizer--this is what you need to implement in iReport
• I'm not positive, but I think this link will get you the methods you need: http://www.jfree.org/jfreechart/api/javadoc/org/jfree/chart/renderer/category/CategoryItemRenderer.html
  setSeriesItemLabelFont(int, Font) and setBaseItemLabelFont(Font).

And just as an example, this is what I did to make the pie chart labels smaller (credits--I used this forum to get started--thanks to jmaher plus JasperSoft support).

Code:

Getting it to compile was my big problem--I'm not a Java programmer, and it took me a while to figure out my classpath (yours will be different, but the point is that you need to include the paths to the jars that are included in the class, in my example, jasperreports, jfreechart including jcommon. ):

[root@mycentos root]# CLASSPATH=$CLASSPATH:/opt/tomcat/webapps/jasperserver/WEB-INF/lib/jfreechart-1.0.1.jar:/opt/tomcat/webapps/jasperserver/WEB-INF/lib/jasperreports-ver:/opt/tomcat/webapps/jasperserver/WEB-INF/lib/jcommon-1.0.0.jar;.;export CLASSPATH

I've pretty much exhausted what I can tell you. Good luck!!!

Mary

[svenn]

I did something simular today. Here's my code

Code:

Post edited by: svenn, at: 2007/08/02 20:00

[flhs]

org.jfree.chart.renderer.category.BarRenderer.setBaseItemLabelFont(new Font("Arial",Font.BOLD,8))

 

thanks your reply ,but i find the method not exist.

 

could you please tell me how to use this method.

 

thanks very much

[svenn]

You can not refer to the method setBaseItemLabelFont directly.

 

You need to get the render object using

 

BarRenderer renderer = (BarRenderer) chart.getCategoryPlot().getRenderer();

 

You can then apply the setBaseItemLabelFont method to the render object.

 

To get a better understanding you should look at the Jasper Reports API and JFreeChart API.

 

Jasper Reports API

 

http://jasperreports.sourceforge.net/api/index.html

 

JFreeChart API

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