save_data: Compute and save layer datasets for a ggplot2 plot.
In hadley/gg2v: Render ggplot2 graphics using vega

Description Usage Arguments Value Examples

Compute and save layer datasets for a ggplot2 plot.

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  save_data(plot, path)

  plot_data(plot)

`ggplot2`	plot
`path`	Existing directory in which to save plot datasets.

save_data: (invisibly) a list that can be transformed to JSON to produce vega data spec.

p1 <- ggplot(mtcars, aes(disp, cyl)) +
  geom_point()
str(plot_data(p1))

str(plot_data(p1 + geom_point(aes(y = cyl + 1))))

p2 <- p1 + geom_point(aes(displ * 61, cyl), data = mpg)
str(plot_data(p2))

p3 <- ggplot(mapping = aes(y = cyl)) +
  geom_point(aes(disp, colour = "mtcars"), data = mtcars) +
  geom_point(aes(displ * 61, colour = "mpg"), data = mpg)
str(plot_data(p3))

td <- temp_dir()
save_data(p3, td)
if (interactive()) show(td)