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int CBCGPChartVisualObject::AddChartEmptyData ( int  nSeries = 0,
DWORD_PTR  dwUserData = 0,
BCGPChartFormatSeries pFormatDataPoint = NULL,
BCGPChartFormatSeries pFormatSeries = 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.

nSeriesA zero-based series index.
dwUserDataUser-defined data associated with a data point.
pFormatDataPointNot used.
pFormatSeriesA pointer to series formatting options.