[R] getting lines with non-rounded caps?

Emmanuel Paradis paradis at isem.univ-montp2.fr
Wed Sep 20 10:50:08 CEST 2000

At 11:31 19/09/00 -0700, you wrote:
>I'm trying to get a plot with wide lines that don't have rounded end caps. 
>You can see the effect quite clearly with a plot like this:
>The colored lines should be between the horizontal lines, but because of the
>rounded end caps, they aren't.
>Under X11, if I set lty to something like "F0", the end caps are turned off. 
>Unfortunately, the "0" appears to get ignored, and the line style is the same
>as "FF", i.e. 16 units of drawn line, then 16 units of space.
>With the postscript device, lines styles like "FF" still get rounded end
>unlike X11.


This is a behaviour I already noticed under Windows NT when using plot(...,
type="h", lwd=10), so that the thickness of the lines is expanded all
around their starting- and end-points, rather than only perpandicularly to
the lines (which was what I expected). A workaround for the example you
give is to use rect()

 thi <- 0.025
 rect(1.5-thi, 0, 1.5+thi, 0.5, col="red", border="red")
 rect(1.5-thi, 0.5, 1.5+thi, 1, col="green", border="green")
 abline(h=0); abline(h=0.5); abline(h=1)

Emmanuel Paradis
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