[R-sig-Geo] linewidth of polygon
Roger Bivand
Roger.Bivand at nhh.no
Fri Sep 9 13:26:09 CEST 2005
On Fri, 9 Sep 2005, Michael Sumner wrote:
> Hello,
>
> >My at hoc solution is to edit output eps file with emacs, and change
> >the value of linewidth directory. It is, however, troublesome job.
> >
> >
> >
> You might try this (here lwd is being passed to lower level plot functions)
>
> pl <- read.shape("pl.shp")
>
> plot(pl, lwd = 0.5)
>
> However ?par reveals
> ...
> 'lwd' The line width, a _positive_ number, defaulting to '1'. The
> interpretation is device-specific, and some devices do not
> implement line widths less than one.
>
> and I certainly don't see a difference with either postscript() or pdf()
> - Windows XP.
No, I believe 1 is the lowest you get. I think that the visual effect can
be varied by increasing the plot area or other fiddling around when
opening a device. As far as I know, plot.Map() does not successfully pass
lwd= either, I'll add the ... to plot.Map calls to polygon(), which will
permit thicker borders, will be in 0.5-2.
>
> I don't know enough about the various devices - eps() etc. - to know if
> this is likely to be helpful.
>
> >It is very nice if we can assign the value of linewidth when we use
> >plot.Map. Or even option to remove boundary itself.
> >
> >
>
> This will plot no boundary at all ("ol" is an argument of plot.Map):
>
> plot(pl, ol = NA)
>
Or plot(pl, ol = "transparent").
Both lwd= and setting border= to transprent do work in the plot methods
for classes in the sp package, and maptools from 0.5-1 depends on sp.
Getting thinner than 1 is open, though.
> I hope that helps.
>
> Cheers, Mike.
>
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--
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no
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