Re: Odd behavior of "set border" and "splot"

On Saturday, 25 January 2020 12:54:50 PST Dima Kogan wrote:
> Hans-Bernhard Bröker <HBB...@t-...> writes:
> >> On the other hand, looking up the bits one by one is inconvenient.
> >> It might be more user-friendly to add a keyword
> >> 
> >>      set border <bitmask> {{no} somethingdescriptive}
> > 
> > I would tend to call them 'corner poles', as they're meant to appear be
> > holding up the otherwise free-floating plotted surface at the corners, a
> > bit like the tent poles.
> 
> Yeah, I like that name; was thinking something along the same lines,
> actually.

That's better then anything I came up with.
OK.  I have added
	{un}set cornerpoles

It controls an on/off TBOOLEAN that is tested in exactly one place,
just before these vertical lines are drawn in draw_3d_graphbox.

	Ethan


> 
> > The syntax could be extended by a keyworded optional argument
> > 
> > 	set border
> > 	...
> > 	{{cornerpoles | cp} {default | <corners>}}
> > 
> > where the 'default' restores the current default: all four corner poles
> > are drawn, if applicable.  The corresponding bit mask value <corners>
> > would be 240, from 128+64+32+16.  I.e. for clarity it would use the same
> > bit positions as in the existing <integer> parameter for the full
> > 
> > Or 'cornerpoles' could become a new 'set' command of its own, or an
> > optional argument to 'set surface', given as it only applies if 'set
> > surface' is on.
> 
> I think it would be nice to manage two separate bit masks that use the
> same bit meanings:
> 
> - the current "border" bitmask
> - a new "cornerpoles" bitmask
> 
> I think this is what you're suggesting. If the "cornerpoles" bitmask
> isn't managed with a new "set cornerpoles", but uses an extension to
> "set border", what syntax are you proposing? How would you set a
> "border" mask A and a "cornerpoles" mask B? Like this?
> 
>   set border A cp B
> 
> Or with two separate calls?
> 
>   set border A
>   set border cp B
> 
> Not sure if one of these is what you had in mind. I think a separate
> "set" would be clearer:
> 
>   set border A
>   set cornerpoles B
> 
> 
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