plotPNG
plotPNG(func, filename = tempfile(fileext = ".png"), width = 400, height = 400, res = 72, ...)
Arguments
func | A function that generates a plot. |
---|---|
filename | The name of the output file. Defaults to
a temp file with extension .png . |
width | Width in pixels. |
height | Height in pixels. |
res | Resolution in pixels per inch. This value is
passed to png . Note that this affects the
resolution of PNG rendering in R; it won't change the
actual ppi of the browser. |
... | Arguments to be passed through to
png . These can be used to set
the width, height, background color, etc. |
Run a plotting function and save the output as a PNG
Description
This function returns the name of the PNG file that it generates. In
essence, it calls png()
, then func()
, then dev.off()
.
So func
must be a function that will generate a plot when used this
way.
Details
For output, it will try to use the following devices, in this order:
quartz (via png
), then CairoPNG
,
and finally png
. This is in order of quality of
output. Notably, plain png
output on Linux and Windows may not
antialias some point shapes, resulting in poor quality output.
In some cases, Cairo()
provides output that looks worse than
png()
. To disable Cairo output for an app, use
options(shiny.usecairo=FALSE)
.