Drawing a dotted circle.

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
project.org] On Behalf Of Rui Barradas
Sent: Saturday, January 12, 2013 1:21 PM
To: Ben Bolker
Cc: r-help at stat.math.ethz.ch; vedsharma at gmail.com
Subject: Re: [R] Drawing a dotted circle.

Hello,

In Windows it's

.Internal(symbols(x, y, type, data, inches, bg, fg, ...))

And this is what I've found:
file r-2.15.2\src\main\graphics.c
function GSymbol

     /*
      * Force line type LTY_SOLID
      * i.e., current par(lty) is ignored when drawing symbols
      */
     gc.lty = LTY_SOLID;


So, the op is out of luck, lty solid is hard-coded in the C source.
Maybe plotrix::draw.circle, like Jose suggested.

Rui Barradas
Em 12-01-2013 18:53, Ben Bolker escreveu:

   A wild guess which I can't check right now, but: is there

something

funny/different with the Windows graphics driver that draws the

result

of a dashed line based on many closely spaced points as a solid line?
i.e., it draws a dash for the beginning of every segment within the
line, even if they are close together, resulting in overlapping

dashes

-> a solid line?  Don't have time to dig into

.External.graphics(C_symbols, x, y, type, data,
         inches, bg, fg, ...)

  right now ...


On 13-01-12 01:41 PM, Rui Barradas wrote:

Hello,

Checks ok on Ubuntu 12.04 but not on Windows 7, where it plots a

solid

line circle.

symbols(0, 0, circles = 1, inches = FALSE, fg = 'gray', lty=2)
sessionInfo()
R version 2.15.2 (2012-10-26)
Platform: x86_64-w64-mingw32/x64 (64-bit)

locale:
[1] LC_COLLATE=Portuguese_Portugal.1252

LC_CTYPE=Portuguese_Portugal.1252

[3] LC_MONETARY=Portuguese_Portugal.1252 LC_NUMERIC=C
[5] LC_TIME=Portuguese_Portugal.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods base

loaded via a namespace (and not attached):
[1] tools_2.15.2


Hope this helps,

Rui Barradas
Em 12-01-2013 17:02, Ben Bolker escreveu:

Ved P. Sharma <vedsharma <at> gmail.com> writes:

I am trying to draw a dotted circle by using symbols command:

symbols(0, 0, circles = 1, inches = FALSE, fg = 'gray', lty=2)

But it gives me a solid line. I was just wondering whether am I

making a

mistake?

    Works for me (although it's a dashed line; lty=3 gives a dotted
line) on Ubuntu 10.04, R-devel.  Results of sessionInfo() please?