BCGControlBar Pro for MFC
void CBCGPChartAreaSeries::SetAreaOrigin ( double  dblValue,
BOOL  bRedraw = FALSE 

Sets the area origin.

Call this method to set the area origin. Once the origin is set, the area chart treats it as a base value, which also affects minimum and maximum values on related Y axis.

dblValueSpecifies the new area origin.
bRedrawTells whether to redraw the chart, or not.