[R] slanted ends of horizontal lines for certain line widths

[Robert Offinger]

Hello,

if I plot a horizontal line, e.g.,

  plot(c(1,2),c(1,1),xlim=c(0,3),lwd=2,type="l")

or

  plot(c(1,2),c(1,1),xlim=c(0,3),lwd=4,type="l")

then the left end (1st example) or both ends (2nd example) of the lines
are not rectangular but slanted on the graphical display (screen).
That behavour first occurred when I was trying to plot a stepfun, e.g.,

y <- round(rnorm(12),1)
Fn12 <- ecdf(y)
plot(Fn12,verticals= FALSE, do.p = FALSE,lwd=2,col.h="red")
plot(Fn12,verticals= FALSE, do.p = FALSE,lwd=4,col.h="red")

(lwd=3 seems okay)

Bug or feature?
Suggestions? (I don't like the slanted ends but lwd=2 would be better
than lwd=3)

Robert Offinger
OvG-Universität Magdeburg

----
platform       sparc-sun-solaris2.9
arch           sparc
os             solaris2.9
system         sparc, solaris2.9
status
major          2
minor          3.1
year           2006
month          06
day            01
svn rev        38247
language       R
version.string Version 2.3.1 (2006-06-01)