shiny+ggvis：如何向散点图添加一条线（中值）？

Question

我有一个闪亮的反应性 ggvis 散点图 (layer_points)。现在我想在图中添加一条水平线和一条垂直线，以类似于 x/y 轴的中值。

我知道如何计算它，但不知道如何在同一图中显示它。到目前为止我的代码：

vis <- reactive({
  # Lables for axes
  xvar_name <- names(axis_vars)[axis_vars == input$xvar]
  yvar_name <- names(axis_vars)[axis_vars == input$yvar]

  xvar <- prop("x", as.symbol(input$xvar))
  yvar <- prop("y", as.symbol(input$yvar))

  gegevens %>%
    ggvis(x = xvar, y = yvar) %>%
    layer_points(size := 50, size.hover := 200,
                 fillOpacity := 0.2, fillOpacity.hover := 0.5,
                 stroke = ~bron, key := ~Project.ID) %>%
    add_tooltip(gegevens_tooltip, "hover") %>%
    add_axis("x", title = xvar_name, format='d', grid = FALSE) %>%
    add_axis("y", title = yvar_name, format='d', grid = FALSE) %>%
        add_legend("stroke", title = "Gegevens van:", values = c("A", "B")) %>%
    scale_numeric("x", trans = "log", expand=0) %>%
    scale_numeric("y", trans = "log", expand=0) %>%
    scale_nominal("stroke", domain = c("A", "B"),
                  range = c("blue", "#aaa")) %>%
    set_options(width = 600, height = 600)
})

vis %>% bind_shiny("plot1")

计算我使用的中位数：

    output$defects <- renderText ({
  d <- median(gegevens()$Total.Defects.Delivered) 
  paste("de mediaan voor totaal aantal Defects is:", d)
})

非常感谢您的帮助。

Answer 1

我好像误解了你的例子，但我让它工作了，就在我发布之后我做不到。那么这里是解决方案：

vis <- reactive({
  # Lables for axes
  xvar_name <- names(axis_vars)[axis_vars == input$xvar]
  yvar_name <- names(axis_vars)[axis_vars == input$yvar]

  xvar <- prop("x", as.symbol(input$xvar))
  yvar <- prop("y", as.symbol(input$yvar))

  gegevens %>%
    ggvis(x = xvar, y = yvar) %>%
    layer_points(size := 50, size.hover := 200,
                 fillOpacity := 0.2, fillOpacity.hover := 0.5,
                 stroke = ~bron, key := ~Project.ID) %>%
    add_tooltip(gegevens_tooltip, "hover") %>%
    add_axis("x", title = xvar_name, format='d', grid = FALSE, properties = axis_props(labels = list(angle = 90, align = "left"))) %>%
    add_axis("y", title = yvar_name, format='d', grid = FALSE) %>%
        add_legend("stroke", title = "Gegevens van:", values = c("A", "B")) %>%
    scale_numeric("x", trans = "log", expand=0) %>%
    scale_numeric("y", trans = "log", expand=0) %>%
    scale_nominal("stroke", domain = c("A", "B"),
                  range = c("blue", "#aaa")) %>%
    set_options(width = 600, height = 600) %>%
    layer_paths(data = gegevens, x = median(gegevens()$kolomname.i.want.the.median.from)), y = yvar ) %>%
    layer_paths(data = gegevens, x = xvar, y = median(gegevens()$kolomname.i.want.the.median.from))
})

即使用户更改了原始输入，这也会通过计算 x 和 y 的中值在我的绘图中打叉。当然，我需要找出如何让 "kolomname.i.want.the.median.from" 成为 x-/ 或 y-值。

但我现在知道如何插入台词了，这就是问题所在。所以谢谢 aosmith 的正确指导。

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