Min width of bars in bar graph

[j3grewal]

Hi,

Is there a way to set minimum width of bars in a bar graph (3D) in iReport? My bar graph will always have only three bars. I want to increase the width of bars so that the bars use up more of the chart area than apprearing far apart.

Also can I control the tranparency of the bars within chart properties?

Regards,
-jas

[svenn]

Welcome to chart heck /tools/fckeditor/editor/images/smiley/msn/teeth_smile.gif

Jasper only exposes a small part of the JFreechart API. To access any properties outside of these you can write a chart customizer class.

 

This may not do exactly want you want but it will be enough to get you started. This assume that you have some Java programming skills.

public class <Your Class> extends JRAbstractChartCustomizer

{

 

    public void customize(JFreeChart chart, JRChart jasperChart) {

          

     //Chart is a bar chart

     if(jasperChart.getChartType() == JRChart.CHART_TYPE_BAR) {

           

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

                       

            //Remove shadow effect from bar

            renderer.setShadowVisible(false);

           

            //Set maximum bar width

            renderer.setMaximumBarWidth(0.10);

           

           //Create no data message

            CategoryPlot categoryplot = (CategoryPlot) chart.getCategoryPlot();

           

            categoryplot.setNoDataMessage("No data available");

            categoryplot.setNoDataMessageFont(new Font("SansSerif",Font.BOLD,14));

            categoryplot.setNoDataMessagePaint(Color.WHITE);

           

            //Set background as transparent

            categoryplot.setBackgroundPaint(null);

                                   

            //Set left margin before first bar and right margin after last bar

            categoryAxis .setLowerMargin(0.02f);

            categoryAxis .setUpperMargin(0.02f);

                                   

     }         

    }

}