我想在資料框中列出的特定值之間繪制矩形，例如：
Region <- c("A","B","A","B","A","C","B","C","A"),
Lon <- c(31.03547, 37.25443, 65.97450, 69.90290, 101.77630,
105.32550, 148.86270, 147.72010, 146.10420)
var1 <- rnorm(n = 9, mean = 15, sd = 100)
regions <- data.frame(Region, Lon, var1)
這是一個示例，我使用以下方法顯示區域限制geom_vline：
ggplot(NULL)
geom_vline(data = regions, aes(xintercept=Lon,
linetype=region,
color = region),
size=0.6)
geom_point(data = regions, aes(x=Lon, y=var1, color=Region))
theme_bw()
我想繪制受這些垂直線限制的背景矩形。
我試圖查看上一個問題：
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