problem with symbol function

Based on your solution, could we not fix this issue for the symbol  
function?
  

Le 27 avr. 09 ? 23:47, Duncan Murdoch a ?crit :

  

On 27/04/2009 5:23 PM, Christophe Dutang wrote:
    

so it could be a limitation of graphics on windows?
      

It's not graphics on Windows, but it appears to be a limitation of  
the windows() graphics device in R.  It is used for bitmap plots as  
well as on-screen plots, which is why you saw the same effect in  
jpeg, but different devices are used for Postscript and PDF.

When drawing lines, R handles the dash style itself, rather than  
using the built-in dashes.  But it doesn't do so for circles, and  
doesn't make use of the Windows line styles.

If you really need the dashes onscreen, you can draw the circle  
yourself.  Assuming the scales are equal on both axes that's easy,  
just use

    

theta <- seq(0,2*pi, len=256)
lines(x+r*cos(theta), y+r*sin(theta), lty="dashed")
      

(where (x,y) is the center and r is the radius).  It's more work if  
you want things to appear as circles when the scales are unequal,  
but I think this works:

circle <- function(x, y, inches=1, ...) {
 theta <- seq(0, 2*pi, len=256)
 lines(x + grconvertX(inches*cos(theta), "inches", "user") -  
grconvertX(0, "inches", "user"),
       y + grconvertY(inches*sin(theta), "inches", "user") -
grconvertY(0, "inches", "user"),
       ...)
}

so you'd get the plot you wanted using

circle(0, 0, inches = 1.5, fg="black",lty="dashed")

The circle function is not vectorized, so it's not as useful as  
symbols, but it could be improved.

Duncan Murdoch


    

It also appears with "long dash" lines.
x <- -4:4
y <- -4:4
plot(x,y,type="n")
symbols(0, 0, add = TRUE, circles = 1, inches = 1, fg="black",   
lty="solid")
symbols(0, 0, add = TRUE, circles = 1, inches = 2,   
fg="black",lty="dashed")
symbols(0, 0, add = TRUE, circles = 1, inches = 3,   
fg="black",lty="longdash", lwd=2)
Le 27 avr. 09 ? 23:07, Joshua Wiley a ?crit :
      

I read that the lty=2 argument does not work on all graphics   
devices. You might double check that since it works on mac.


Joshua Wiley



---- Original message ----
        

Date: Mon, 27 Apr 2009 22:58:11 +0200
From: Christophe Dutang <dutangc at gmail.com>
Subject: Re: [R] problem with symbol function
To: Joshua Wiley <jwile004 at ucr.edu>
Cc: r-help at r-project.org

This point is ok if I download R from the Austrian mirror. R is
properly install on both computers. I also get this strange  
behavior
with R 2.7.2. There is something I'm missing...


Le 27 avr. 09 ? 22:54, Joshua Wiley a ?crit :

          

I am running SP3. You said earlier that you were having trouble
downloading 2.9.0, are you sure everything downloaded and  
installed
properly? There have been some questions about transitioning to  
the
new build going around.

Joshua Wiley



---- Original message ----
            

Date: Mon, 27 Apr 2009 22:45:26 +0200
From: Christophe Dutang <dutangc at gmail.com>
Subject: Re: [R] problem with symbol function
To: Joshua Wiley <jwile004 at ucr.edu>
Cc: r-help at r-project.org

what is your service pack version?

at home I use the SP2 version.

Le 27 avr. 09 ? 22:29, Joshua Wiley a ?crit :

              

Hi Christophe,

I am able to plot dashed circles on Windows. I'm afraid I do not
have any suggestions for you. What happens when you try to  
plot it
on Windows?


Joshua Wiley


---- Original message ----
                

Date: Mon, 27 Apr 2009 22:15:53 +0200
From: r-help-bounces at r-project.org (on behalf of Christophe
Dutang <dutangc at gmail.com
                  

)
                    

Subject: [R] problem with symbol function
To: r-help at r-project.org

Hi all,

I use the symbol functions to draw circles. But the argument  
lty
does
not work on windows but works correctly on my macbook:

x <- -4:4
y <- -4:4

plot(x,y,type="n")

symbols(0, 0, add = TRUE, circles = 1, inches = 1, fg="black",
lty="solid")

symbols(0, 0, add = TRUE, circles = 1, inches = 2, fg="black",
lty="dashed")


The second circle should be drawn with dash... it works on my
macbook
but on my PC.

I use R 2.9.0 on windows xp home and mac os 10.5.

Does anyone have this problem? is it a limitation of windows?

thanks in advance


Christophe

--
Christophe Dutang
Ph. D. student at ISFA, Lyon, France
website: http://dutangc.free.fr





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--
Christophe Dutang
Ph. D. student at ISFA, Lyon, France
website: http://dutangc.free.fr




              

--
Christophe Dutang
Ph. D. student at ISFA, Lyon, France
website: http://dutangc.free.fr




          

--
Christophe Dutang
Ph. D. student at ISFA, Lyon, France
website: http://dutangc.free.fr
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------------------------------------------------------------------------

--
Christophe Dutang
Ph. D. student at ISFA, Lyon, France
website: http://dutangc.free.fr