astBBufastBBuf - Begin a new graphical buffering context

Description:
This function starts a new graphics buffering context. A matching call to the function astEBufastEBuf should be used to end the context.
Synopsis:
void astBBuf( AstPlot $*$this )
Parameters:
this
Pointer to the PlotPlot.
Notes:
  • The nature of the buffering is determined by the underlying graphics system (as defined by the current grf module). Each call to this function to this function simply invokes the astGBBuf function in the grf module.