Run a plotting function and save the output as a PNG
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.
plotPNG( func, filename = tempfile(fileext = ".png"), width = 400, height = 400, res = 72, ... )
func |
A function that generates a plot. |
filename |
The name of the output file. Defaults to a temp file with
extension |
width |
Width in pixels. |
height |
Height in pixels. |
res |
Resolution in pixels per inch. This value is passed to
|
... |
Arguments to be passed through to |
For output, it will try to use the following devices, in this order:
quartz (via grDevices::png()), then Cairo::CairoPNG(),
and finally grDevices::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).
Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.