[R] Artifacts in filled.contour+pdf

[baptiste auguie]

Hi,

As an alternative, maybe you could use lattice::panel.levelplot.raster
which I think doesn't have this problem in pdf viewers.

HTH,

baptiste


On 26 October 2010 02:30, David Winsemius <dwinsemius at comcast.net> wrote:
>
> On Oct 25, 2010, at 6:50 AM, Mario Valle wrote:
>
>> Dear all,
>> I'm using R 2.12.0 on Windows 7 (32bits)
>> I created a filled contour from the attached data using the following
>> code:
>>
>> load('bug.RData')
>> pdf('bug.pdf', width=14, height=7)
>> filled.contour(o4$x, o4$y, o4$z, color=rainbow, xlim=c(4,18),
>> ylim=c(0,35), zlim=c(14,36))
>> dev.off()
>>
>> If you look (I used acrobat reader 9.4) at the attached bug.pdf, you see
>> an incomplete grid of gray lines.
>
> From the pdf help page:
> "Note
> If you see problems with PDF output, do remember that the problem is much
> more likely to be in your viewer than in R. Try another viewer if possible.
> Symptoms for which the viewer has been at fault are apparent grids on image
> plots (turn off graphics anti-aliasing in your viewer if you) and missing or
> incorrect glyphs in text (viewers silently doing font substitution).
>
> Unfortunately the default viewers on most Linux and Mac OS X systems have
> these problems, and no obvious way to turn off graphics anti-aliasing. "
>
> Are they there when printed?
>
> On a Mac I can make the lines in that pdf graphic "appear and disappear" in
> different places on my screen by changing the "Page Display" settings for
> Resolution in Acrobat Reader, and viewing in other applications like
> GraphicConverter I see even more lines tha I do in Acrobat Reader.
>
> --
>
> David.
>
>> This artifact is not present if the output is PNG (attached, obtained in
>> the above code using png('bug.png', width=800, height=400) instead of
>> pdf()).
>> Seems like a off-by-one bug. Is it a known bug? Is there any workaround? I
>> tried lattice::contourplot but it does not support NA.
>> Thanks for your help!
>>                                               mario
>>
>> --
>> Ing. Mario Valle
>> Data Analysis and Visualization Group            |
>> http://www.cscs.ch/~mvalle
>> Swiss National Supercomputing Centre (CSCS)      | Tel:  +41 (91)
>> 610.82.60
>> v. Cantonale Galleria 2, 6928 Manno, Switzerland | Fax:  +41 (91)
>> 610.82.82
>>
>>
>> <bug.pdf><bug.png>______________________________________________
>> R-help at 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.
>
> ______________________________________________
> R-help at 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.
>