高宪章 - 添加多个文本注释

Question

我有一个堆叠的柱形图，我需要在每列下方有一个文本注释。我只找到了一种添加注释的方法。添加第二个批注会产生错误All arguments must be named list。可悲的是，我知道如何使用hc_annotations功能。

这是我尝试过的一个小工作示例和代码位：

hc <- highchart() %>% 
hc_chart(type = "column") %>%
hc_plotOptions(column = list(stacking = "normal")) %>%
hc_title(text = "Plot with Annotations", useHTML = TRUE) %>%
hc_yAxis(title = "") %>%
hc_xAxis(title = "") %>%
hc_xAxis(categories = c("A", "B", "C", "D", "E"))
hc <- hc %>%
hc_add_series(name = "S1", data = c(5, 1, 2, 4, 5),
dataLabels = list(format='{point.y:,.1f}', align = "center", enabled = TRUE))
hc <- hc %>%
hc_add_series(name = "S2", data = c(-1, -4, 3, -2, -4),
dataLabels = list(format='{point.y:,.1f}', align = "center", enabled = TRUE))

##try to add annotations
#1
hc <- hc %>%
hc_annotations(list(xValue = 0, yValue = -2, title = list(text = '-6 pp'))) 
hc <- hc %>%
hc_annotations(list(xValue = 1, yValue = -8, title = list(text = '-5 pp')))
#2 - basically the same as #1
hc <- hc %>%
hc_annotations(list(xValue = 0, yValue = -2, title = list(text = '-6 pp'))) %>%
hc_annotations(list(xValue = 1, yValue = -8, title = list(text = '-5 pp')))
#3
hc <- hc %>%
hc_annotations(list(list(xValue = 0, yValue = -2, title = list(text = '-6 pp')),
list(xValue = 0, yValue = -8, title = list(text = '-5 pp')))
) 
hc

我只是在这里使用了两个注释作为展示。在我的最终代码中，每列下方需要一个注释。

Answer 1

这是一个已知问题，可以通过以下函数解决：

• hc_add_annotation
• hc_add_annotations

使用示例：

hc %>%
hc_add_annotation(xValue = 0, yValue = -2, title = list(text = '-6 pp')) %>% 
hc_add_annotation(xValue = 1, yValue = -4.5, title = list(text = '-5 pp'))
hc %>% 
hc_add_annotations(
list(
list(xValue = 0, yValue = -2, title = list(text = '-6 pp')),
list(xValue = 1, yValue = -4.5, title = list(text = '-5 pp'))
)
)

甚至更好：

df <- data_frame(
xValue = c(0, 1),
yValue = c(-2, -4.5),
title = c("-6pp", "-5pp")
)
df <- df %>% 
mutate(title = map(title, function(x) list(text = x)))
df
#> # A tibble: 2 x 3
#>   xValue yValue      title
#>    <dbl>  <dbl>     <list>
#> 1      0   -2.0 <list [1]>
#> 2      1   -4.5 <list [1]>
hc %>% 
hc_add_annotations(df)

参考： https://github.com/jbkunst/highcharter/issues/171