[Bioc-devel] PNG Graphics overwrite problem on MacOSX

[Steffen Neumann]

On Mon, 2010-01-11 at 07:59 -0500, Kasper Daniel Hansen wrote:
> Is this only for PNG are does this also seems weird when you use, say, pdf() on OS X?
I don't have a Mac at hand, so I can't test :-(

> It is hard to say, but it seems that the title is not just
> overplotting, but two different texts overplotted.
Yes, they have different texts, and the whole plots should've gone 
into different "%003d.png" files.

>   Are you explicitly drawing the title several times and for the other
> platforms the text just gets positioned exactly on top of each other,
> or are you sure you are only drawing the text once (this is impossible
> to tell from your snippet)?  
Plotting code is identical for all platforms. The full snippet is at
https://hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/xcms/R/xcmsEIC.R
You see that I (or rather the original author :-) "uses" 
an plot(0, 0, type = "n", main = "Extracted ...", xlim=...)
to setup the plot including axes and title. My guess was that 
axes and main was not cleared between two consecutive "%003d.png",
which might explain the platform dependency.

Should I put in an explicit plot.new() ? 
I'd though that was done implicitely by plot() ?

Yours,
Steffen


-- 
IPB Halle                    AG Massenspektrometrie & Bioinformatik
Dr. Steffen Neumann          http://www.IPB-Halle.DE
Weinberg 3                   http://msbi.bic-gh.de
06120 Halle                  Tel. +49 (0) 345 5582 - 1470
                                  +49 (0) 345 5582 - 0
sneumann(at)IPB-Halle.DE     Fax. +49 (0) 345 5582 - 1409