| pdf {grDevices} | R Documentation |
pdf starts the graphics device driver for producing PDF
graphics.
pdf(file = ifelse(onefile, "Rplots.pdf", "Rplot%03d.pdf"),
width = 6, height = 6, onefile = TRUE, family = "Helvetica",
title = "R Graphics Output", fonts = NULL, version = "1.1",
encoding, bg, fg, pointsize)
file |
a character string giving the name of the file. |
width, height |
the width and height of the graphics region in inches. |
onefile |
logical: if true (the default) allow multiple figures in one file. If false, generate a file name containing the page number. |
family |
the font family to be used, one of "AvantGarde",
"Bookman", "Courier", "Helvetica",
"Helvetica-Narrow", "NewCenturySchoolbook",
"Palatino" or "Times". Note the other
specifications allowed for postscript are not
available. |
title |
title string to embed in the file. |
encoding |
the name of an encoding file. Defaults to
"ISOLatin1.enc"
in the ‘R_HOME/afm’ directory, which is used if the path does
not contain a path separator. An extension ".enc" can be
omitted. |
pointsize |
the default point size to be used. |
bg |
the default background color to be used. |
fg |
the default foreground color to be used. |
fonts |
a character vector specifying device-independent R graphics font family names for fonts which will be included in the PDF file. |
version |
a string describing the PDF version that will be used to produce output. |
pdf() opens the file file and the PDF commands needed to
plot any graphics requested are sent to that file.
The family argument can be used to specify either a
device-independent R graphics font family (see
postscriptFonts) or a PDF-specific
font family as the initial/default font for the device.
If a device-independent R graphics font family is specified
(e.g., via par(family=) in the graphics package),
the PDF device makes use of the PostScript font mappings to
convert the R graphics font family
to a PDF-specific font family description. R does not
embed fonts in the PDF file though, so it is only possible to
use mappings to the font families that are
assumed to be available in a PDF viewer: "Times" or
"Times New Roman",
"Helvetica" or "Arial", "Courier",
"Symbol", and "ZapfDingbats".
See postscript for details of encodings, as the internal
code is shared between the drivers. The native PDF encoding is given
in file ‘PDFDoc.enc’.
pdf writes uncompressed PDF. It is primarily intended for
producing PDF graphics for inclusion in other documents, and
PDF-includers such as pdftex are usually able to handle
compression.
At present the PDF is fairly simple, with each page being represented as a single stream. The R graphics model does not distinguish graphics objects at the level of the driver interface.
The version argument modifies the sort of PDF code that
gets produced. At the moment this only concerns the production of
transparent output. The version must be greater than 1.4 for
transparent output to be produced. Specifying a lower version
number may be useful if you want to produce PDF output that can be
viewed on older PDF viewers.
Acrobat Reader does not use the fonts specified but rather emulates them from multiple-master fonts. This can be seen in imprecise centering of characters, for example the multiply and divide signs in Helvetica.
postscriptFonts,
Devices,
postscript
## Not run:
## Test function for encodings
TestChars <- function(encoding="ISOLatin1", ...)
{
pdf(encoding=encoding, ...)
par(pty="s")
plot(c(-1,16), c(-1,16), type="n", xlab="", ylab="", xaxs="i", yaxs="i")
title(paste("Centred chars in encoding", encoding))
grid(17, 17, lty=1)
for(i in c(32:255)) {
x <- i
y <- i
points(x, y, pch=i)
}
dev.off()
}
## there will be many warnings.
TestChars("ISOLatin2")
## doesn't view properly in US-spec Acrobat 5.05, but gs7.04 works.
## Lots of characters are not centred.
## End(Not run)