Default device instead of ``No graphics device is active''

[Thomas Lumley]

On Mon, 12 Jan 1998, Martin Maechler wrote:

> in RHOME/src/ :
> 	grep DevInit */*.[ch]
> reveals only a few calls such as
> 
> 	if(!DevInit) error("No graphics device is active\n");
> 
> (in graphics/graphics.c  and  main/par.c).
> 
> Couldn't we startup a default device instead of having the error message?

yes, though I think the default device for batch processing should do
nothing or just emit warnings -- if postscript() is the default then you
might overwrite the previous contents of an output file. At least if it is
going to be postscript() it should use a unique file name. 

It should be relatively easy to define a none() device that does
absolutely nothing (a simple but inefficient one would be
postscript("/dev/null") under Unix)

	-thomas

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