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

From: Duncan Murdoch <murdoch_at_stats.uwo.ca>
Date: Mon, 16 Jun 2008 18:40:42 -0400

On 16/06/2008 4:49 PM, Peter Dalgaard 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...).

I'd also mention pretty(), to calculate tick mark locations.

Duncan Murdoch

>



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