On Fri, 3 Aug 2001, BXC (Bendix Carstensen) wrote:
> Funnily enough, it seems that adjustment of text in the verical
> direction is more flexible than in the horizontal. Horizontal
> adjustment parameters, seem to be set to the closest of 0 and 1
> if they fall outside (0,1). Try e.g.:
>
> plot(0:1,0:1)
> for (a in seq(-5,5,0.5) ) text(0.5, 0.5, "Y", adj=c(0,a), cex=2,
col="red" )
> for (a in seq(-5,5,0.5) ) text(0.5, 0.5, "X", adj=c(a,0), cex=2,
col="blue"
> )
>
> Any particular reason for this restriction in the horizontal direction?
Horizontal adjustment makes use of driver capabilities: vertical
adjustment does not. So in fact it is driver-dependent, and the X11 and
postscript drivers do not have this restriction. I assume you are on
Windows NT, although you did not say so ....
However, this is documented not to work, as ?text says
adj: one or two values in [0,1] which specify the x (and
optionally y) adjustment of the labels.
and that restriction is imposed for devices with dd->dp.canHAdj == 1.
So either we should be adding a new feature (and changing the
documentation accordingly), or imposing the restriction on all devices.
Note ?par says
adj: The value of `adj' determines the way in which text strings
are justified. A value of `0' produces left-justified text,
`0.5' centered text and `1' right-justified text. Note that
the `adj' argument of `text' also allows `adj = c(x,y)'
for
different adjustment in x- and y- direction.
which suggests only three values are allowed.
--
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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