ggplot中的面板透明度

Question

我想我的輸出ggplot2圖形有透明邊框（面板），但白色（不透明）情節背景。

我想這兩個選項

d <- rnorm(100) 
df <- data.frame(y = d, x = 1) 
p <- ggplot(df) + stat_boxplot(aes(x = x, y = y)) 
# first option 
p <- p + theme(
    panel.background = element_rect(fill = "transparent", colour = NA), 
    panel.grid.minor = element_blank(), 
    panel.grid.major = element_blank() 
) 
# second option 
# p <- p + theme(
# panel.background = element_rect(fill = "transparent", colour = NA), 
# panel.grid.minor = element_blank(), 
# panel.grid.major = element_blank(), 
# plot.background = element_rect(fill = "transparent", colour = NA) 
#) 

png('plot.png', width = 300, height = 300, units = "px", bg = "transparent") 
print(p) 
dev.off() 

但我不滿意輸出

Answer 1

好，訣竅是顯而易見的。我誤解了面板和情節背景。所以這一個應該工作：

# third option 
p <- p + theme(
    panel.grid.minor = element_blank(), 
    panel.grid.major = element_blank(), 
    plot.background = element_rect(fill = "transparent", colour = NA) 
)