相关疑难解决方法(0)

我正在使用 ggplot 将各种事件绘制为它们开始的日期（x 轴）和开始时间（y 轴）的函数。数据/代码如下：

date<-c("2013-06-05","2013-06-05","2013-06-04","2013-06-04","2013-06-04","2013-06-04","2013-06-04",
    "2013-06-04","2013-06-04","2013-06-03","2013-06-03","2013-06-03","2013-06-03","2013-06-03",
    "2013-06-02","2013-06-02","2013-06-02","2013-06-02","2013-06-02","2013-06-02","2013-06-02")
start <-c("07:36:00","01:30:00","22:19:00","22:12:00","20:16:00","19:19:00","09:00:00",
     "06:45:00","01:03:00","22:15:00","19:05:00","08:59:00","08:01:00","07:08:00",
     "23:24:00","20:39:00","18:53:00","16:57:00","15:07:00","14:33:00","13:24:00")
duration <-c(0.5,6.1,2.18,0.12,1.93,0.95,10.32,
         2.25,5.7,2.78,3.17,9.03,0.95,0.88,
         7.73,2.75,1.77,1.92,1.83,0.57,1.13)
event <-c("AF201","SS431","BE201","CD331","HG511","CD331","WQ115",
      "CD331","SS431","WQ115","HG511","WQ115","CD331","AF201",
      "SS431","WQ115","HG511","WQ115","CD331","AS335","CD331")

df<-data.frame(date,start,duration,event)

library(ggplot2)
library(scales)

p <- ggplot(df, aes(as.Date(date),as.POSIXct(start,format='%H:%M:%S'),color=event))
p <- p+geom_point(alpha = I(6/10),size=5) 
p + ylab("time (hr)") + xlab("date") + scale_x_date(labels = date_format("%m/%d")) +
scale_y_datetime(labels = date_format("%H"))+
scale_colour_hue(h=c(360, 90))
theme(axis.text.x = element_text(hjust=1, angle=0))  

结果图如下所示：

问题：不是简单地用一个点（如上所示）指示事件的开始时间，我如何绘制跨越事件持续时间的条形图？如上面的数据框所示，我有这个持续时间数据（以小时为单位）。或者，我可以提供“停止时间”（未显示）。

我想象这个解决方案看起来像一个堆积的条形图。但是，条形图并不完全正确，因为它假定条形图从图的底部开始，并且垂直堆叠的事件之间没有间隙。我的事件可能是不连续的——在沿 y 轴的不同位置“开始”和“停止”。解决方案还必须考虑到 1) 某些事件最终可能是并发的（时间重叠）和 2) 某些事件将跨越多天。

如有任何建议，我将不胜感激！