在 r-plotly 中显示值之间的差异答案

【问题标题】：Show difference between values in r-plotly在 r-plotly 中显示值之间的差异
【发布时间】：2020-11-06 23:41:58
【问题描述】：

我想在悬停信息中添加有关图表中值之间的差异的信息。最好如下图所示。

我的例子：

library(plotly)
trace_1 <- sample(1:20)
main <- sample(1:20)
diff <-main - trace_1
x <- c(1:20)

data <- data.frame(x, trace_1, diff)

fig <- plot_ly(data, x = ~x, y = ~trace_1, name = 'trace 1', type = 'scatter', mode = 'lines') 
fig <- fig %>% add_trace(y = ~main, name = 'main', type = 'scatter', mode = 'lines') 
fig <- fig %>%
  layout(hovermode = "x unified")
fig

【问题讨论】：

是否可以添加另一行以“y”作为区别？也许是透明的笔触？

标签： r hover plotly r-plotly

【解决方案1】：

您可以添加另一条计算为差异的线，并将线颜色设置为透明。

library(plotly)

df = mtcars %>%
  tibble::rownames_to_column("cars") %>%
  mutate(diff = mpg - wt)

plot_ly(df) %>% 
  add_lines(x = ~cars,y = ~mpg,name="mpg") %>% 
  add_lines(x = ~cars,y = ~wt,name="weight") %>% 
  add_lines(x = ~cars,y = ~diff,name="diff",line = list(color = "rgba(0,0,0,0)"))

【讨论】：