互动图:显示悬停的垂线-Rinteractiveplot:showverticallineonhover

2  

A partial answer (can't comment)... Plotly has type "scattergl" which draws a horizontal and vertical line on hover.

部分回答(不能评论)……Plotly有类型“分散”绘制水平和垂直线悬停。

Data

数据

require(plotly)    

sdate <- as.Date("2015-01-01", format = "%Y-%m-%d")
timedf <- data.frame(Date = seq.Date(sdate, by="month", length.out=12),
                         Amount = runif(12, 0, 100))
# Plotly plot
plot_ly(timedf, x=Date, y=Amount, type="scattergl")

Output

输出

1  

Follow Chris' answer, to make it work

按照克里斯的回答，让它工作

library(ggplot2)
library(shiny)

ui <- fluidPage(
    fluidRow(
        column(width = 12,
               plotOutput("plot1", height = 350,hover = "plot_hover")
        )
    )
)

server <- function(input, output) {
    testPlot <- ggplot(mtcars, aes(x=mpg,y=disp,color=factor(cyl))) + 
        geom_point()

    #start up plot
    output$plot1 <- renderPlot({testPlot})

    # plot after mouse over
    observeEvent(input$plot_hover, {
        x = input$plot_hover$x
        y = input$plot_hover$y
        nearPoint <- nearPoints(mtcars, input$plot_hover, 
                                threshold = 10, maxpoints = 1)
        output$plot1 <- renderPlot({
            if (nrow(nearPoint) == 1) {
                testPlot + 
                    geom_vline(xintercept = nearPoint$mpg) +
                    geom_label(x = x + 1.5, y = y, 
                               label = paste(rownames(nearPoint), "\n", nearPoint$disp))
            } else {
                testPlot
            }
        })
    })
}

shinyApp(ui, server)

0  

Here's a partial answer. I can't quite get it to work, but maybe someone will see something obvious. I've used ggplot2 instead of ggvis for the geom_vline() function which creates a vertical line.

这是一个部分的答案。我不能让它正常工作，但也许有人会看到一些显而易见的东西。我用了ggplot2代替了ge_vline()函数，它创建了一条垂直线。

What's working:

On the input$plot_hover event, we assign the x coordinate to a variable (h) and then use that variable as the xintercept arguement to the geom_vline() function which draws a vertical line.

在输入$plot_hover事件上，我们将x坐标赋给一个变量(h)，然后使用该变量作为对绘制垂直线的geom_vline()函数的xintercept论述。

The problem:

Since this is happening in a reactive environment, on every update h is flushed, so the line disappears about a second after it first appears.

由于这是在反应性环境中发生的，所以每次更新h时都会刷新，因此第一次出现后大约一秒钟行就会消失。

What I've tried:

I tried to assign h to a second variable t in order to keep it between updates. This didn't work, so I created a third variable prev_t and when there was no input (is.null(input$plot_hover) == TRUE), keep t as prev_t. This also isn't working but I don't have a ton of time to try out different things.

我试图把h赋给第二个变量t，以便在更新之间保持它。这不起作用，所以我创建了第三个变量prev_t，当没有输入(is.null(输入$plot_hover) == TRUE)时，保持t为prev_t。这也行不通，但我没有太多时间去尝试不同的东西。

Here's the code:

这是代码:

library(ggplot2)
library(shiny)

ui <- fluidPage(
    fluidRow(
        column(width = 12,
               plotOutput("plot1", height = 350,hover = hoverOpts(id ="plot_hover"))
        )
    )
)

server <- function(input, output) {

   #h <- reactive(input$plot_hover)

   prev_t <- vector()

    output$plot1 <- renderPlot({

        if(!is.null(input$plot_hover)){
            x <- input$plot_hover
            h <- x$x
            t <- h


        # the below isnt quite working
        # I was trying to store t between updates to make the line stay on 
        # the graph until there was a second hover event

        ################### !!! ###################
        } else if(is.null(input$plot_hover)) {
            t <- prev_t
        }

        prev_t <- t
        ################## !!! ####################

        ggplot(mtcars, aes(x=mpg,y=disp,color=factor(cyl))) + geom_point() + geom_vline(xintercept = t)

    })


}
shinyApp(ui, server)

Hopefully that should maybe put you on a different path or help a little. If someone sees something that could fix this problem, please let me know.

希望这能让你走上一条不同的道路或者有所帮助。如果有人看到什么可以解决这个问题，请告诉我。