Re: [Rd] mtext adj= wrong with several las= (PR#7188)

From: Uwe Ligges <ligges_at_statistik.uni-dortmund.de>
Date: Fri 27 Aug 2004 - 01:02:01 EST

joehl@gmx.de wrote:
>
> Hi Uwe,
>
> Thanks for your mail.
>
> I see it different: yes, Left / right adjustemnt seems to be perfectly OK.
> But at axis 1 with las=1, it's not Left / right adjustement what is needed
> here. Here the text needs to be right adjusted, and the (one) adj= par
> should determine the vertical alignment.

I don't think so. Things are perfectly clear for the user if adj controls adjustment in reading direction independently from the las setting - and a second value specifying perpendicular adjustment.

 > It is a bit confusing, but for
> mtext, the distance to the axis is done via line= and adj= moves ALONG the
> axis, whatever las= says.

No, adj moves not always along the axis:

plot(1:10)

mtext("Hello", 3, at=5, adj=0, col="red")
mtext("Hello", 3, at=5, adj=1, col="green")
mtext("Hello", 3, at=5, adj=0, col="red", las = 2)
mtext("Hello", 3, at=5, adj=1, col="green", las = 2)


> I agree that it would be more flexible and logical to also have the 2
> element form of adj=c(horizontal, vertical) here, but I fear that this
> creates a lot of incompatibilities with existing code and with S+.

My suggestion was different: using a new argument padj to be more flexible.

Uwe Ligges

> Best
>
>
> Jens
>
>
>

>>Left / right adjustemnt seems to be perfectly OK.
>>The thing that matters is centering "several lines" to the specified 
>>("at=") location.
>>In fact, mtext() is not centering but bottom-aligning by adding a 
>>negative distance that looks OK for one line in the default font size, 
>>but not in most other cases.
>>
>>Hence this is the same as Paul Murrell's PR#1659 ("mtext() alignment of 
>>perpendicular text"). Fixing this, and/or improving mtext()'s "adj" 
>>argument to accept 2 dimensions is desirable, but might be not that 
>>easy... I'll take a look during the next days, but nothing promised.

>
>
> --
>
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R-devel@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel Received on Fri Aug 27 01:07:52 2004

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