But is this behaviour a bug or by design? Hadley On Tue, Apr 22, 2008 at 10:47 AM, Prof Brian Ripley <[EMAIL PROTECTED]> wrote: > plot(0, 0, pch=21, bg="#FF000022", col="#FF000001") > > may be (close to) what you are looking for. > > > > On Tue, 22 Apr 2008, Karl Ove Hufthammer wrote: > > > R version 2.7.0 RC (2008-04-20 r45403) > > > > When using semi-transparent filled plotting symbols, the border of the > > symbol has a different (darker) colour than the interior: > > > > plot(0, 0, pch=19, col="#FF000022") > > > > (Saving this as a PDF and looking at it magnified may make it easier to > > see.) > > > > This is pretty annoying, since when plotting partially overlapping > > points, the border colour dominates, making the colour of overlapping > > points more saturated than they should be. > > > > This isn't so much of a problem when using very large values of 'cex', > > since the width of the border is constant, and doesn't vary with cex. > > But with small values (and the default value) of cex, it's very visible. > > > > I thought this maybe could be solved by using pch=21 instead of pch=19, > > and setting the 'bg' colour to the same colour as 'col', like this. > > > > plot(0, 0, pch=21, col="#FF000022", bg="#FF000022") > > > > But this has no effect. 'bg' *does* set the background (interior) colour > > (this is easy to check by using a different colour), but not the border > > colour, which is determined by 'col' alone. > > > > So I guess in theory I can get the border and interior the same colour by > > setting 'col' to a ligher colour than the one I actually want to use, > > and then set the 'bg' colour to the one I want to use. But how should I > > select the lighter colour so that the darker version (i.e., the border > > colour) is the one I want? > > > > Frankly, the current behaviour feels much more like a bug than a feature. > > If I set pch=19, I want a completely filled circle, even if my chosen > > colour is partially transparent. > > > > I'm using > > R version 2.7.0 RC (2008-04-20 r45403) > > i686-pc-linux-gnu > > > > -- > > Karl Ove Hufthammer > > > > ______________________________________________ > > R-help@r-project.org mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > > and provide commented, minimal, self-contained, reproducible code. > > > > -- > Brian D. Ripley, [EMAIL PROTECTED] > Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ > University of Oxford, Tel: +44 1865 272861 (self) > 1 South Parks Road, +44 1865 272866 (PA) > Oxford OX1 3TG, UK Fax: +44 1865 272595 > > > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. >
-- http://had.co.nz/ ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
