There is draw.arc in the plotrix package.

On Wed, Apr 7, 2010 at 10:20 AM, baptiste auguie
<baptiste.aug...@googlemail.com> wrote:
> Hi,
>
> Barry suggested a way to place the text labels; I would like to point
> out the grid.curve() function that might help in connecting the labels
> with nice-looking curves. I don't know of a base graphics equivalent
> (xspline() might come close) so it might be best to opt for Grid.
>
> HTH,
>
> baptiste
>
>
> On 7 April 2010 15:46, Barry Rowlingson <b.rowling...@lancaster.ac.uk> wrote:
>> On Wed, Apr 7, 2010 at 2:28 PM, Brock Tibert <btibe...@yahoo.com> wrote:
>>> Hi All,
>>>
>>> I am new to R, but it has been a lot of fun learning as I go and have been 
>>> blow away by what it can do.  Came across this example and wanted to see if 
>>> ggplot2 or some other visualization package could make this sort of graphic.
>>>
>>> http://www.visualcomplexity.com/vc/project.cfm?id=717&utm_source=feedburner&utm_medium=feed&utm_campaign=Feed:+visualcomplexity+(visualcomplexity.com)&utm_content=Google+Reader
>>>
>>> Thanks in advance!
>>
>>  Not quite out-of-the box, but you can draw text with the text()
>> function setting the angle with the 'srt' parameter, and you can draw
>> lines using 'lines'. You can compute angles using 'pi'. You'll need a
>> bit of trig to work out the angle that the lines start and end at.
>> That's about all you need to know.
>>
>>  Some of the subtleties of the typesetting of that specific piece may
>> be tricky, but it's easy to write a function that takes a vector of
>> strings and an adjacency matrix and plots something like it.
>>
>>  Give R-help another hour and I reckon something will turn up. Not
>> from me, I'm watching the IPL cricket.
>>
>> Barry
>>
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>>
>
> ______________________________________________
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>

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