Save .png by webshot in R

问题

I'm using webshot to save a png file from HTML :

p <- plot_ly(plotly::wind, r = ~r, t = ~t) %>% add_area(color = ~nms)%>%
 layout(radialaxis = list(ticksuffix = "%"), orientation = 270)

saveWidget(as.widget(p), "temp.html")
webshot("temp.html",file = "temp.png",cliprect = "viewport")

This is giving me a plot like this. It returns a small image in the upper left corner. What should I do to have a full-size image in a center?

来源：https://stackoverflow.com/questions/48289771/save-png-by-webshot-in-r