BCGControlBar Pro for MFC
void CBCGPChartSurfaceSeries::SetDrawFlat ( BOOL  bSet = FALSE,
double  dblFlatLevel = -0.9 
)

Sets "draw flat" option.

Call this method to set the "draw flat" option. When this option is TRUE, the series calculates all surface colors according to the real Y values, but draws all surface cells at the specified by dblFlatLevel Y value simulating projection on a horizontal plane.

dblFlatLevel is specified in Y axis coordinates and clamped to minimum and maximum axis values.

Parameters
bSetTRUE - draw flat surface; FALSE - draw regular surface.
dblFlatLevelY value of flat level.