! \internal Places the raw data points needed for a normal linearly connected graph in \a linePixelData. As for all plot data retrieval functions, \a scatterData just contains all unaltered data (scatter) points that are visible for drawing scatter points, if necessary. If drawing scatter points is disabled (i.e. the scatter style's shape is \ref QCPScatterStyle::ssNone), pass 0 as \a
source not stored for this graph (policy: none)
nothing calls this directly
no test coverage detected