BCGControlBar Pro for MFC
void CBCGPChartSeries::SetDataLabelAngle ( double  dblAngle,
int  nDataPointIndex = -1 

Sets angle of data point's data label.

A wrapper for formatting options. Call this method to set an angle, in degrees, between data label position and vertical axis. If nDataPointIndex is -1 this option is set for a series. For "get" operation use CBCGPChartSeries::GetDataPointFormat(nDataPointIndex, FALSE); and the use the returned formatting structure to access the required fields.

dblAngleSpecifies the new angle.
nDataPointIndexSpecifies a data point index. Use -1 to set the option for a series.