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`facet_wrap()` with `scales = "free_x"` squishes middle facets

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評估

難度
4/5
預估耗時
3-5 天
新手友好度
45/100
Issue 類型
缺陷
描述清晰度
基本清楚
活躍度
冷清
技術堆疊
javascript, r

研究方向

先執行提供的 R/Shiny MWE,搭配 ggplot2、plotly 和 facet_wrap(scales = "free_x"),然後在 Shiny 外部重現調整大小的操作序列。檢查產生的繪圖版面配置以及調整大小期間的回應式行為;當中間的 facet 列維持預期高度,且調整大小後沒有出現空白時,即表示完成。

由索引模型根據 Issue 內容生成。

描述

Summary

When using facet_wrap() with scales = "free_x", the middle facets rows appear squished.

MWE

This bug is most apparent when working in Shiny contexts:

library(ggplot2)
library(shiny)
library(plotly)

ui <- fluidPage(
  plotlyOutput("p", height = "800px")
)

server <- function(input, output, session) {
  output$p <- renderPlotly({
    plt <- palmerpenguins::penguins |>
      ggplot(
        aes(x = sex)
      ) +
      geom_bar() +
      facet_wrap(
        ggplot2::vars(species, island, year),
        ncol = 2,
        axes = "all",
        scales = "free_x" # or "free"
      )

    plotly::ggplotly(plt)
  })
}

shinyApp(ui, server)

The result is an output where the first and last row of facets look correct, but all the middle facet rows are squished and there's a bunch of whitespace inbetween:

Image

Interestingly, if you use scales = "free_y" or scales = "fixed", the bug is not triggered:

Image

Potential Cause

I believe this is an issue with the responsivity / css of the resulting plot. You can get this to trigger outside of shiny, by doing the following:

  1. Size your plot output window to result in a squished output, and run the following:
plt <- palmerpenguins::penguins |>
  ggplot(
    aes(x = sex)
  ) +
  geom_bar() +
  facet_wrap(
    ggplot2::vars(species, island, year),
    ncol = 2,
    axes = "all",
    scales = "free_x"
  )

plotly::ggplotly(plt)

Result:

Image
  1. Resize the plot window by increasing the height, and you get the weird result:
Image
  1. Key observation: if you now re-run the code from step 1, with the window height already tall, it renders correctly:
Image

This is why I think there's responsivity / css thing going on here -- I imagine Shiny is rendering to a smaller height, then resizing to fill the space of the div. Responsivity is broken, triggering the weird result.

Thanks for looking in to this!

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R
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從這裡開始

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  3. Fork 儲存庫,在一個分支上完成修改。
  4. 送出 Pull Request,並在描述裡引用這個 Issue 編號。

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