mtext() alignment of perpendicular text (PR#1659)

[p.murrell@auckland.ac.nz]

mtext() does a poor job of placing text when it is perpendicular (e.g.,
side=1, las=3) and the font size is not the default.

The following code snippet demonstrates the problem ...

plot(1:10)
abline(v=1:10, col="grey")
axis(3, at=1:10, las=3, labels=FALSE)
mtext(1:10, at=1:10, side=3, line=1, las=3)
axis(3, line=-2, at=1:10, las=3, labels=FALSE)
mtext(1:10, at=1:10, side=3, line=-1, las=3, cex=.5)
axis(3, line=-5, at=1:10, las=3, labels=FALSE)
mtext(1:10, at=1:10, side=3, line=-4, las=3, cex=2)

The ugliness varies a bit across devices.

In GMtext() in graphics.c there is a hardcoded adjustment of 0.3 which
is described as "purely visual tuning".  I think this needs to be
replaced with a more general solution.

Paul


--please do not edit the information below--

Version:
 platform = sparc-sun-solaris2.7
 arch = sparc
 os = solaris2.7
 system = sparc, solaris2.7
 status = Under development (unstable)
 major = 1
 minor = 6.0
 year = 2002
 month = 06
 day = 10
 language = R

Search Path:
 .GlobalEnv, package:ctest, Autoloads, package:base

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