在绘图中，如何保留有关套索选择和单击点的信息? [英] In plotly, how do I retain the information about both the lasso selection and the clicked point?

问题描述

我正在使用plotly::ggplotly()，我需要用户既可以选择单个点又可以通过刷涂选择多个点.我希望两个选择选项并行存在.用户应该能够单击一个点并套索选择多个点，并且应该记录这两条信息.

I'm using plotly::ggplotly() and I need the user to be able to both select a single point and to select multiple points with brushing. I want both selection options to exist in parallel. The user should be able to click on a point and to lasso select several points, and both of those pieces of information should be recorded.

我遇到的问题是，如果单击某个点，则会重设套索选择.但是事实并非如此:如果我套索选择然后单击一个点，则两者都会保留.

The problem I'm having is that if I click on a point, then the lasso selection gets reset. But the opposite is not true: if I lasso select and then click on a point, then both are retained.

这是此问题的GIF文件

Here's a GIF of this issue

这是我的代码:

library(shiny)
library(plotly)

ui <- fluidPage(
  plotlyOutput("plot"),
  verbatimTextOutput("click"),
  verbatimTextOutput("brush")
)

server <- function(input, output, session) {

  nms <- row.names(mtcars)

  output$plot <- renderPlotly({
    p <- ggplot(mtcars, aes(x = mpg, y = wt, key = nms)) + geom_point()
    ggplotly(p) %>% layout(dragmode = "lasso")
  })

  output$click <- renderPrint({
    d <- event_data("plotly_click")
    if (!is.null(d)) d
  })

  output$brush <- renderPrint({
    d <- event_data("plotly_selected")
    if (!is.null(d)) d
  })

}

shinyApp(ui, server)

要重现:

• 单击单个点
• 进行套索选择
• 当前都可见
• 单击其他点
• 现在套索选择信息不见了
• 再次选择套索，两个都再次可见

推荐答案

如果将event_data传递给renderPrint()函数外部的对象，则此方法应该起作用.如果您删除下面突出显示的可选行，您还可以保留以前的套索/点击结果:

If you pass the event_data to an object outside the renderPrint() function this should work. You can also keep previous lasso/click results if you remove the optional lines highlighted below:

ui <- fluidPage(
    plotlyOutput("plot"),
    verbatimTextOutput("click"),
    verbatimTextOutput("brush")
)

server <- function(input, output, session) {
    frame1 <- data.frame()
    frame2 <- data.frame()
    nms <- row.names(mtcars)

    output$plot <- renderPlotly({
        p <- ggplot(mtcars, aes(x = mpg, y = wt, key = nms)) + geom_point()
        ggplotly(p) %>% layout(dragmode = "lasso")
    })

    output$click <- renderPrint({
        d <- event_data("plotly_click")
        if (!is.null(d)) {
            frame1 <<- frame1[is.null(frame1$pointNumber), ] # Optional line to remove the previous selections
            frame1 <<- rbind(frame1, d) 
        }
            frame1
        })

    output$brush <- renderPrint({
        d <- event_data("plotly_selected")
        if (!is.null(d)) {
            frame2 <<- frame2[is.null(frame2$pointNumber), ] # Optional line to remove the previous selections 
            frame2 <<- rbind(frame2, d)
        }
            frame2

    })

}

shinyApp(ui, server)

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