Re: [R] in axis() suppressing axis line but keeping tick marks

From: Andrew Yee <yee_at_post.harvard.edu>
Date: Mon, 16 Jun 2008 16:54:40 -0400

Thanks for tracking this down.

Andrew

On Mon, Jun 16, 2008 at 4:49 PM, Peter Dalgaard <p.dalgaard_at_biostat.ku.dk> wrote:

> Andrew Yee wrote:
>
>> I've been trying to figure out a parameter that will let you separately
>> adjust the parameters for the axis line from the tick mark.
>>
>> In the following example, I would like to suppress the axis line, but keep
>> the tick marks.
>>
>>
> The source code is the ultimate reference. We have in do_axis in
> src/main/plot.c:
>
> if (doticks) {
> gpptr(dd)->col = col;/*was fg */
> GLine(axis_low, axis_base, axis_high, axis_base, NFC, dd);
> for (i = 0; i < n; i++) {
> x = REAL(at)[i];
> if (low <= x && x <= high) {
> x = GConvertX(x, USER, NFC, dd);
> GLine(x, axis_base, x, axis_tick, NFC, dd);
> }
> }
> }
>
> and, as you see, there is no way the line parameters can change between the
> GLine calls, no hope of finding a magical par() setting. So I'm afraid you
> have to bite the bullet, do the relevant coordinate calculations, and use
> segments() do draw the ticks. (Or try convincing Paul Murrell to change the
> design, but that takes longer...).
>
> --
> O__ ---- Peter Dalgaard ุster Farimagsgade 5, Entr.B
> c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
> (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
> ~~~~~~~~~~ - (p.dalgaard_at_biostat.ku.dk) FAX: (+45) 35327907
>
>

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