Re: x11: border lw 0 vs lw 1 for lt -1

[Petr M. <mi...@ph...>]

> > It seems to me that X11 is having thick linewidth 1 for the border:
> > 	set border 4095 lw 0; splot x
> > 	set term x11 2
> > 	set border 4095 lw 1; splot x
> > For other terminals (ps, png, windows), the border thicknesses 0 and 1 are 
> > both thin.
> > 
> > Try
> > 	plot sin(x) w l lt 0 lw 0, sin(x)+0.1 w l lt -1 lw 1
> > on different terminals. It seems that only the X11 produces a thick line for 
> > linetype -1. Is there a reason for this?
>
> The default has been that way since at least version 3.7
> The relevant X resource is:
> 
>   gnuplot*borderWidth: 2

Looking to the source code ([bB]order[wW]idth] appears in gplt_x11.c, 
x11.trm and be.trm), I wonder how this option is implemented... I don't see 
that it sets any global variable in the gnuplot core. Further it seems that 
this is actually a multiplicate constant, not a line width in pixels as 
"help x11 line" describes. Is this right?

Additionally, this indicates:

src/gplt_x11.c:    {"-borderwidth", ".borderwidth", XrmoptionSepArg, 
(XPointer) NULL},
src/gplt_x11.c:    {"-bw", ".borderwidth", XrmoptionSepArg, (XPointer) 
NULL},

that
	gnuplot -bw 5
would set the default border to the number indicated, but it does nothing.

Further, there are
    { "-iconic", hasNoArg}, { "-rv", hasNoArg},
   { "-selectionTimeout", hasArg}, 
    { "-name", hasArg},
and other potential command line options which are not documented
in "help x11 line".

---
PM