如何将R中的dygraph包生成的图导出到png？

Question

How can I export a plot generated with the R package "dygraphs" to a png file?

library(dygraphs)
sample_dat <- data.frame(1:1000, rnorm(1000))
dygraph(sample_dat)

Answer 1

As hrbrmstr suggested in the comments, try using webshot .

library(dygraphs)
sample_dat <- data.frame(1:1000, rnorm(1000))
dygraph(sample_dat)

This produces the following output in my default web browser (safari in this instance):

You will notice in the address bar a path to where the file is temporarily stored on your local drive:

Copy paste that path like in the following:

webshot("file:///var/folders/47/71_55p097y94jptwk6t75f8w0000gn/T/RtmpBPhijO/viewhtml2f836e308321/index.html", 
    "dygraph.png")

Also note, you may get the following warning if you don't have PhantomJS installed:

PhantomJS not found. You can install it with webshot::install_phantomjs(). If it is installed, please make sure the phantomjs executable can be found via the PATH variable.

...in which case run webshot::install_phantomjs()

Once, webshot has saved it, you will notice a new file saved to your working directory: