int CBCGPChartVisualObject::AddChartEmptyData	(	const CString &	strCategoryName,
		int	nSeries = 0,
		DWORD_PTR	dwUserData = 0,
		BCGPChartFormatSeries *	pFormatDataPoint = NULL
	)

Adds empty data point.

Call this method to add empty data point. It can be used if particular data is missing or unknown. A series treats missing data according to "treat null" settings defined by CBCGPChartSeries::SetTreatNulls.

Parameters

strCategoryName	Specifies category name of missing data.
nSeries	A zero-based series index.
dwUserData	User-defined data associated with a data point.
pFormatDataPoint	Not used.