Normally there is a consistent gap between the bars, but when there is a 2D view with a lot of bars the gap is gone and it looks ugly with some dark lines and some light. Is there anything we can do to improve the appearance of the 2D chart ?
The ClusterWidth property is not set to 100 percent.
To have the bars use all space that is available you will need to set the ClusterWidth property of the JCBarChartFormat object to 100 percent. This will determine the percentage of available space that will be occupied by the bars. Please see the attached example that demonstrates.