[R] [FORGED] Re: draw stripes in a circle in R

[Jeff Newmiller]

Sigh. I never load packages in .Rprofile to avoid the irreproducibility trap. Might seem drastic to some, but I don't feel much pain because I almost always edit my code in a file rather than on the fly at the console, and re-run it frequently from a fresh R process to check my progress. 
-- 
Sent from my phone. Please excuse my brevity.

On June 14, 2017 3:27:15 PM PDT, David Winsemius <dwinsemius at comcast.net> wrote:
>
>> On Jun 14, 2017, at 1:53 PM, Rolf Turner <r.turner at auckland.ac.nz>
>wrote:
>> 
>> On 15/06/17 05:29, David Winsemius wrote:
>>>> On Jun 14, 2017, at 10:18 AM, David Winsemius
><dwinsemius at comcast.net> wrote:
>>>> 
>>>> 
>>>>> On Jun 14, 2017, at 9:46 AM, Jeff Newmiller
><jdnewmil at dcn.davis.ca.us> wrote:
>>>>> 
>>>>> I don't see a question. If your question is whether R supports
>pattern fills, AFAIK it does not. If that is not your question, ask
>one.
>>>>> -- 
>>>>> Sent from my phone. Please excuse my brevity.
>>>>> 
>>>>> On June 14, 2017 7:57:41 AM PDT, jean-philippe
><jeanphilippe.fontaine at gssi.infn.it> wrote:
>>>>>> dear R users,
>>>>>> 
>>>>>> I would like to fill a circle with yellow stripes instead of a
>uniform
>>>>>> yellow color. To draw the circle I used the following command
>after
>>>>>> having loaded the (very nice !) plotrix library :
>>> I finally understood the question and it needs a hack to the
>draw.circle function in plotrix since the angle and density arguments
>don't get passed in:
>>> First get code for draw.circle:
>>> ------
>>> draw.circle   # then copy to console and edit
>>> draw.circle2  <- function (x, y, radius, nv = 100, border = NULL,
>col = NA, lty = 1,
>>>                            density=NA, angle=45,  lwd = 1 )
>>> {
>>>     xylim <- par("usr")
>>>     plotdim <- par("pin")
>>>     ymult <- getYmult()
>>>     angle.inc <- 2 * pi/nv
>>>     angles <- seq(0, 2 * pi - angle.inc, by = angle.inc)
>>>     if (length(col) < length(radius))
>>>         col <- rep(col, length.out = length(radius))
>>>     for (circle in 1:length(radius)) {
>>>         xv <- cos(angles) * radius[circle] + x
>>>         yv <- sin(angles) * radius[circle] * ymult + y
>>>         polygon(xv, yv, border = border, col = col, lty = lty,
>density=density, angle=angle,
>>>                 lwd = lwd)
>>>     }
>>>     invisible(list(x = xv, y = yv))
>>> }
>>> Now run your call to pdf with draw.circle2 instead of draw.circle.
>> 
>> This is just idle curiosity, since I'm not really able to contribute
>anything useful, but I can't resist asking:  When I try to run the OP's
>code I get an error:
>> 
>>> Error in alpha("red", 0.4) : could not find function "alpha".
>> 
>> Why does this (apparently) not happen to anyone else?  Why does the
>universe pick on *me*?  What is the function "alpha()"?  Where is it to
>be found?
>
>I discovered some time ago that I no longer needed to load the ggplot2
>package. I wasn't entirely happy to make this discovery since I stilll
>cling to the old lattice style. Eventually I figgured out that it was
>because one of packages that I load in my .Rprofile-file had changed
>its imports. The `alpha` function I see is from ggplot2. Resistance is
>futile. I've now been partially assimilated.
>
>
>> 
>> Searching on "alpha" is of course completely unproductive; there are
>far too many (totally irrelevant) instances.
>
>
>> 
>> cheers,
>> 
>> Rolf
>> 
>> -- 
>> Technical Editor ANZJS
>> Department of Statistics
>> University of Auckland
>> Phone: +64-9-373-7599 ext. 88276
>
>David Winsemius
>Alameda, CA, USA