BCGControlBar Pro for MFC
void CBCGPChartBarSeries::SetColumnOverlapPercent ( int  nPercent = 0)

Sets the distance between column/bars.

The distance is measured in percents from a column/bar size. It specifies a gap between columns/bars in a group (a "group" means a couple of data points of distinct series having the same X coordinate and therefore placed on the same major unit).

This setting has the same effect for all series displayed on the same axis, e.g. it's enough to call this method for one series. For example:

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pSeries1->SetColumnOverlapPercent(-50);
pSeries2->SetColumnOverlapPercent(-25);

"Series1" and "Series2" will be displayed with distance -25%.

Negative value specifies separation, positive - overlapping.

Parameters
nPercentSpecifies the overlap percent and should be in range [-100, 100].