Jari Oksanen <jari.oksanen <at> oulu.fi> writes: > > Hello R Developers, > > Dear R-developers, > > I ran some standard tests with currently (today morning) compiled R release > candidate in Linux R 2.12.1 RC (2010-12-13 r53843). Some of these tests used > plot.TukeyHSD function. This worked OK on the screen (X11 device), but > PostScript file could not be rendered. The following example had the problem > with me: > > postscript(file="tukeyplot.ps") > example(plot.TukeyHSD) > dev.off() > > I couldn't view the resulting file with evince in Linux nor in the standard > Preview in MacOS. When I compared the generated "tukeyplot.ps" to the same > file generated with an older R in my Mac, I found one difference: > > $ diff -U2 oldtukeyplot.ps /Volumes/TIKKU/tukeyplot.ps > --- oldtukeyplot.ps 2010-12-14 12:06:07.000000000 +0200 > +++ /Volumes/TIKKU/tukeyplot.ps 2010-12-14 12:13:32.000000000 +0200 > @@ -172,5 +172,5 @@ > 0 setgray > 0.00 setlinewidth > -[ 3.00 5.00] 0 setdash > +[ 0.00 0.00] 0 setdash > np > 660.06 91.44 m > > Editing the changed line to its old value "[ 3.00 5.00] 0 setdash" also > fixed the problem both in Linux and in Mac. Evidently something has changed, > and probably somewhere else than in plot.TukeyHSD (which hasn't changed > since r51093 in trunk and never in R-2-12-branch). I know nothing about > PostScript so that I cannot say anything more (and I know viewers can fail > with standard conforming PostScript but it is a bit disconcerting that two > viewers fail when they worked earlier).
I must really be avoiding work today ... I can diagnose this (I think) but don't know the best way to solve it. At this point, line widths on PDF devices were allowed to be <1. ========== r52180 | murrell | 2010-06-02 23:20:33 -0400 (Wed, 02 Jun 2010) | 1 line Changed paths: M /trunk/NEWS M /trunk/src/library/grDevices/src/devPS.c allow lwd less than 1 on PDF device ========== The behavior of PDF devices (by experiment) is to draw a 0-width line as 1 pixel wide, at whatever resolution is currently being rendered. On the other hand, 0-width lines appear to break PostScript. (with the Linux viewer 'evince' I get warnings about "rangecheck -15" when trying to view such a file). plot.TukeyHSD contains the lines abline(h = yvals, lty = 1, lwd = 0, col = "lightgray") abline(v = 0, lty = 2, lwd = 0, ...) which are presumably meant to render minimum-width lines. I don't know whether it makes more sense to (1) change plot.TukeyHSD to use positive widths (although that may not help: I tried setting lwd=1e-5 and got the line widths rounded to 0 in the PostScript file); (2) change the postscript driver to *not* allow line widths < 1 (i.e., distinguish between PS and PDF and revert to the pre-r52180 behaviour for PS only). On reflection #2 seems to make more sense, but digging through devPS.c it's not immediately obvious to me where/how in SetLineStyle or PostScriptSetLineTexture one can tell whether the current driver is PS or PDF ... ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
