astGetGrfContextastGetGrfContext - Return the KeyMap that describes a Plot's graphics context

Description:
This function returns a reference to a KeyMapKeyMap that will be passed to any drawing functions registered using astGrfSetastGrfSet. This KeyMap can be used by an application to pass information to the drawing functions about the context in which they are being called. The contents of the KeyMap are never accessed byt the PlotPlot class itself.
Synopsis:
AstKeyMap $*$astGetGrfContext( AstPlot $*$this )
Parameters:
this
Pointer to the Plot.
Returned Value:
astGetGrfContext()
A pointer to the graphics context KeyMap. The returned pointer should be annulled when it is no longer needed.