在内存中创建ggplot2图？

Question

我试图在内存中捕获ggplot2图形创建的结果,将其发送到服务器.谁有个好主意如何解决？

我的代码看起来像这样:

data(mtcars)
x <- ggplot(mtcars, aes(x=mpg, y=hp)) +
  geom_point(shape=1)
print(x) # RStudio can capture the output, but I'm unable to do it.
ggsave(filename="a.jpg", plot=x) # not really a solution, need it not on disk, but as blob in memory.

Answer 1

您可以使用该magick包来执行此操作。

library(magick)
data(mtcars)
x <- ggplot(mtcars, aes(x=mpg, y=hp)) +
  geom_point(shape=1)
fig <- image_graph(width = 400, height=400, res=96)
print(x)
dev.off()
figpng <- image_write(fig, path=NULL, format="png")

figpng现在是你的绘图的 png 的原始向量。