title: Shiny mouse coordinates are in pixel
body: <p>I replicated <a href="http://shiny.rstudio.com/gallery/plot-interaction-zoom.html" rel="nofollow noreferrer">this example</a>, which worked fine until I loaded the app on a server. On the server the mouse coordinates are captured based on the pixel position on the screen instead of being based on the unit of the plot. </p>