BarOverLapPercent and BarWidthPercent
RadChart has been replaced by RadHtmlChart, Telerik's client-side charting component. If you are considering RadChart for new development, examine the RadHtmlChart documentation and online demos first to see if it will fit your development needs. If you are already using RadChart in your projects, you can migrate to RadHtmlChart by following these articles: Migrating Series, Migrating Axes, Migrating Date Axes, Migrating Databinding, Features parity. Support for RadChart is discontinued as of Q3 2014, but the control will remain in the assembly so it can still be used. We encourage you to use RadHtmlChart for new development.
In bar charts with multiple series BarOverLapPercent governs to what degree the bars will overlap the preceding bar series. If you enter a negative value for BarOverLapPercent, a gap appears between the bars of different series. Overlapping is especially useful when a long series of items needs to fit in a small-size chart.
BarWidthPercent controls how much space each bar takes up so that a BarWidthPercent of 100 will have all the bars in the chart taking exactly all the available width.
The maximum bar width is calculated as follows: bar width = axislength / bars count .
See the examples below to see how these two properties work together.