R › R help

Curved arrows

_‹ Previous Topic Next Topic _›

Classic

List

Threaded

4 messages Options

Paul Chatfield-3

Curved arrows

I'm trying to draw an arrow with a curved shaft on the graph as a straight one looks messy on a detailed graph. I've looked in arrows but it doesn't seem to give an option. larrows doesn't look much more promising. I had a look in the archive and couldn't find anything. Any thoughts?

Thanks

Paul

Gábor Csárdi-2

Re: Curved arrows

Paul,

there might be other solutions as well, but there is an internal
function in the igraph package that can draw curved arrows, it is
called igraph:::igraph.Arrows(). As it is an internal function, it is
not documented, but I think it is pretty straightforward to use. For
the 'curved' argument you can give a number, try values between 0 and
1, or (if I remember well) -1 and 0 if you want it to curve towards
the opposite side.

Best,
Gabor

On Thu, Apr 30, 2009 at 10:57 AM, Paul Chatfield
<[hidden email]> wrote:

>
> I'm trying to draw an arrow with a curved shaft on the graph as a straight
> one looks messy on a detailed graph. I've looked in arrows but it doesn't
> seem to give an option. larrows doesn't look much more promising. I had a
> look in the archive and couldn't find anything. Any thoughts?
>
> Thanks
>
> Paul
> --
> View this message in context: http://www.nabble.com/Curved-arrows-tp23312316p23312316.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> [hidden email] mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

--
Gabor Csardi <[hidden email]> UNIL DGM

______________________________________________
[hidden email] mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

Gábor Csárdi-2

Re: Curved arrows

In reply to this post by Paul Chatfield-3

On Thu, Apr 30, 2009 at 2:37 PM, <[hidden email]> wrote:
> Hey - I tried this without success. The igraph doesn't work with R 2.9.0,

That is strange, why not?

> so I'm using it with the 2.8.0 version which is the previous one I had. Can you write a simple code that would put an arrow with a curved shaft on, e.g
> plot(3,5)
> igraph.Arrows(3,4,4,5)

Exactly like this, but the function is not exported, and you need the
'curved' argument:

plot(3,5)
igraph:::igraph.Arrows(3,4,4,5)
igraph:::igraph.Arrows(3,4,4,5, curved=TRUE)
igraph:::igraph.Arrows(3,4,4,5, curved=-0.5)
igraph:::igraph.Arrows(3,4,4,5, curved=-1)
igraph:::igraph.Arrows(3,4,4,5, curved=1)

You need igraph version 0.5.2 for this I think. Type
head(igraph:::igraph.Arrows)
to see the other arguments to play with.

Gabor

> Thanks for your quick reply before that was much appreciated,
>
> Paul
>
> Gábor Csárdi-2 wrote:
>>
>> Paul,
>>
>> there might be other solutions as well, but there is an internal
>> function in the igraph package that can draw curved arrows, it is
>> called igraph:::igraph.Arrows(). As it is an internal function, it is
>> not documented, but I think it is pretty straightforward to use. For
>> the 'curved' argument you can give a number, try values between 0 and
>> 1, or (if I remember well) -1 and 0 if you want it to curve towards
>> the opposite side.
>>
>> Best,
>> Gabor
>>
>> On Thu, Apr 30, 2009 at 10:57 AM, Paul Chatfield
>> <[hidden email]> wrote:
>>>
>>> I'm trying to draw an arrow with a curved shaft on the graph as a
>>> straight
>>> one looks messy on a detailed graph. I've looked in arrows but it
>>> doesn't
>>> seem to give an option. larrows doesn't look much more promising. I had
>>> a
>>> look in the archive and couldn't find anything. Any thoughts?
>>>
>>> Thanks
>>>
>>> Paul
>>> --
>>> View this message in context:
>>> http://www.nabble.com/Curved-arrows-tp23312316p23312316.html
>>> Sent from the R help mailing list archive at Nabble.com.
>>>
>>> ______________________________________________
>>> [hidden email] mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>> PLEASE do read the posting guide
>>> http://www.R-project.org/posting-guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>>>
>>
>>
>>
>> --
>> Gabor Csardi <[hidden email]> UNIL DGM
>>
>> ______________________________________________
>> [hidden email] mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>>
> Quoted from: http://www.nabble.com/Curved-arrows-tp23312316p23312605.html
>
>

Greg Snow-2

Re: Curved arrows

In reply to this post by Paul Chatfield-3

?xspline for the shaft, do the head by hand (or using arrows with a very short shaft)

--
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
[hidden email]
801.408.8111

> -----Original Message-----
> From: [hidden email] [mailto:r-help-bounces@r-
> project.org] On Behalf Of Paul Chatfield
> Sent: Thursday, April 30, 2009 2:57 AM
> To: [hidden email]
> Subject: [R] Curved arrows
>
>
> I'm trying to draw an arrow with a curved shaft on the graph as a
> straight
> one looks messy on a detailed graph. I've looked in arrows but it
> doesn't
> seem to give an option. larrows doesn't look much more promising. I
> had a
> look in the archive and couldn't find anything. Any thoughts?
>
> Thanks
>
> Paul
> --
> View this message in context: http://www.nabble.com/Curved-arrows-
> tp23312316p23312316.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> [hidden email] mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-
> guide.html
> and provide commented, minimal, self-contained, reproducible code.

______________________________________________
[hidden email] mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.