我正在尝试根据用户 Didzis Elferts 提供的大量代码在 ggplot 中制作甘特图。我正在尝试添加一条显示今天日期的垂直线,但包geom_vline
中的图层ggplot2
只是返回Error: Discrete value supplied to continuous scale
. 这是我的代码:
today <- as.Date(Sys.Date(), "%m/%d/%Y")
library(scales)
ggplot(mdfr, aes(time,name, colour = is.critical)) +
geom_line(size = 6) +
xlab("") + ylab("")+
labs(title="Sample Project Progress")+
theme_bw()+
scale_x_datetime(breaks=date_breaks("1 year"))+
geom_vline(aes(xintercept=today))
没有命令的情节geom_vline
如下所示:
有什么理由geom_vline
不适合“日期”角色?
编辑:用于生成情节的可重现代码:
### GANTT CHART 1 ###############3
tasks <- c("Meetings", "Client Calls", "Design", "Bidding", "Construction")
dfr <- data.frame(
name = factor(tasks, levels = tasks),
start.date = c("07/08/2013", "07/08/2013", "07/23/2013", "08/30/2013", "9/30/2013"),
end.date = c("07/12/2013", "07/13/2013", "08/15/2013", "09/12/2013", "12/01/2013"),
is.critical = c(TRUE, FALSE, TRUE, TRUE, TRUE))
mdfr <- melt(dfr, measure.vars = c("start.date", "end.date"))
mdfr$time <- as.POSIXct(strptime(mdfr$value,"%m/%d/%Y"))