Hi,
I have been having issues producing plots in JPEG format, using type =
"cairo" to get better anti-aliasing. When trying to set the physical
size with units = "cm" or units = "mm", the width is set correctly but
the height is not - it looks like the height is simply treated as
pixels regardless of the 'units' argument.
Example:
x = 1:10
y = 2 * x
jpeg("ExamplePlot.jpg",
type = "cairo",
width = 200,
height = 200,
units = "mm",
res = 96)
plot(x, y)
dev.off()
On my system (Windows 7, running R 3.4.2), this produces a plot that
is 755 x 200 pixels, and is vertically very squashed.
Looking at grDevices::jpeg, it looks like the culprit is these lines:
g <- .geometry(width, height, units, res)
if (match.arg(type) == "cairo") {
antialias <- match(match.arg(antialias), aa.cairo)
invisible(.External(C_devCairo, filename, 3L, g$width,
height, pointsize, bg, res, antialias, quality, if
(nzchar(family)) family else "sans",
300))
}
g$width is used, but "height" is used instead of "g$height". I suspect
simply using "g$height" here would fix the issue but have not had time
to test this.
My R.version:
platform x86_64-w64-mingw32
arch x86_64
os mingw32
system x86_64, mingw32
status
major 3
minor 4.2
year 2017
month 09
day 28
svn rev 73368
language R
version.string R version 3.4.2 (2017-09-28)
nickname Short Summer
Please let me know if any further information is needed.
Thanks,
Marius
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