[R] latex, eps graphics and transparent colors

From: Michael Friendly <friendly_at_yorku.ca>
Date: Wed, 13 Apr 2011 13:30:17 -0400

I have a diagram to be included in latex, where all my figures are .eps graphics (so pdflatex is not an
option) and I want to achieve something
like the following: three concentric filled circles varying in lightness or saturation. It is easiest to do this using transparency, but in my test using the postscript driver, the transparent color fills do not appear. Is it correct that postscript() does not support transparency?

circle <-function (radius = 1, segments=61) {

         angles <- (0:segments)*2*pi/segments
         radius * cbind( cos(angles), sin(angles))

plot(1:5, 1:5, type='n', xlim=c(-1,5), ylim=c(-1,5), xlab='', ylab='',

         asp=1, xaxt="n", yaxt="n")

#clrs <- trans.colors("lightblue", alpha=c(.2, .4, .6)) ## from heplots package
clrs <- c("#ADD8E633", "#ADD8E666", "#ADD8E699")

c1 <- circle(3)

polygon(    c1, col=clrs[1], border="lightblue")
polygon(.67*c1, col=clrs[2], border="lightblue")
polygon(.33*c1, col=clrs[3], border="lightblue")

arrows(-1, 0, 5, 0, angle=10, length=.2, lwd=2, col="darkgray") arrows( 0, -1, 0, 5, angle=10, length=.2, lwd=2, col="darkgray")

One alternative that sort of works is to use the png() driver, and then convert fig.png fig.eps
but I need very high resolution to make the real diagram legible.

It might suffice to use hcl() colors to approximate what I've done with transparency,
but I don't know how to start with a given color ("lightblue") and achieve roughly
similar resuts.

Michael Friendly     Email: friendly AT yorku DOT ca
Professor, Psychology Dept.
York University      Voice: 416 736-5115 x66249 Fax: 416 736-5814
4700 Keele Street    Web:   http://www.datavis.ca
Toronto, ONT  M3J 1P3 CANADA

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Received on Wed 13 Apr 2011 - 17:35:15 GMT

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