当数据为POSIXct时，ggplotly()不显示geom_vline/geom_hline [英] ggplotly() does not display geom_vline / geom_hline when data is POSIXct

问题描述

我正在尝试制作带有时间标记"的图表.这些时间标记是某些日期的垂直线.时间数据是POSIXct格式.我想使用Plotly令人敬畏的交互式界面，并在其中使用ggplot对象.

I am trying to make a graph with "time markers". These time markers are vertical lines for certain dates. Time data are POSIXct format. I would like to use the awesome interactive interface of Plotly and use my ggplot objects in it.

问题在于，使用ggplotly()之后，这些时间标记"没有显示出来.我已经尝试过使用plotly::add_segments()，但是它不起作用. 这是两个可复制的示例:

The problem is that these "time markers" doesn't show in after using ggplotly(). I ave already tried with plotly::add_segments() but it does not work. Here are two reproductible examples :

1.对于非POSIXct数据，它可以正常工作

# dummy dataset
df2 = data.frame(id = 1:10, measure = runif(10, 0, 20))
events2 = data.frame(number = c(2,3,8))
# ggplot graph
p2 = ggplot() + geom_line(data = df2, aes(x = id, y = measure))  +
  geom_vline(data = events2, aes(xintercept = events2$number), color = "red")
p2
# plotly graph that displays the geom_vline properly
ggplotly(p2)

2.使用POSIXct时，数据无法显示正确的结果

# dummy dataset
df = data.frame(date = seq(as.POSIXct("2017-07-01", tz = "UTC", format = "%Y-%m-%d"),
                           as.POSIXct("2018-04-15", tz = "UTC", format = "%Y-%m-%d"),
                           "1 month"),
                measure = runif(10, 0, 20))
events = data.frame(date_envents = as.POSIXct(c("2017-10-12", "2017-11-12", "2018-03-15"), tz = "UTC", format = "%Y-%m-%d"))
# ggplot graph
p = ggplot() + geom_line(data = df, aes(x = date, y = measure))  +
  geom_vline(data = events, aes(xintercept = events$date), color = "red")
p
# plotly graph that does not display the geom_vline properly
ggplotly(p)

我已经看到一些解决方法(例如这样的方法:在ggplotly图中添加垂直线)，但它是复杂的".有没有更简单的方法来解决此问题?

I have seen some workaround (like this one : Add vertical line to ggplotly plot) but it is "complicated". Is there a more simple way to solve this problem ?

我正在将Windows 10与R版本3.5.0，RStudio和以下软件包一起使用: library(tidyverse)和library(plotly)

I am using Windows 10 with R version 3.5.0, RStudio and the following packages : library(tidyverse) and library(plotly)

推荐答案

一个简单的解决方法是将geom_vline的xintecept设置为数字.

A simple workaround is to set the xintecept of the geom_vline to numeric.

样本数据

df = data.frame(date = seq(as.POSIXct("2017-07-01", tz = "UTC", format = "%Y-%m-%d"),
                           as.POSIXct("2018-04-15", tz = "UTC", format = "%Y-%m-%d"),
                           "1 month"),
                measure = runif(10, 0, 20))
events = data.frame(date_envents = as.POSIXct(c("2017-10-12", "2017-11-12", "2018-03-15"), tz = "UTC", format = "%Y-%m-%d"))

代码

p = ggplot() + geom_line(data = df, aes(x = date, y = measure))  +
  geom_vline(data = events, aes(xintercept = as.numeric(events$date)), color = "red")

结果

ggplotly(p)

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