Shiny plots PDF export

Sometimes it is useful to build a pdf export option into a Shiny app. I built a basic app at first (every important notes was included as comment) to show how to do it easily:

you can also export the ggplot2 type plots like this:

Feel free to download the source code from here.

final notes: If you would like to use Cairo on Ubuntu you need to run this commands at first:

sudo apt-get install libcairo2-dev
sudo apt-get install libxt-dev`