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legend positioning #195

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@chriddyp

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@chriddyp

a lot of legends are coming out with weird positioning (#194 (comment))

a couple things to work out:

  • move the horizontal position of the legend to the right more

    layout$legend$x <- 1.0 # move it to the right a bit
    layout$legend$xanchor <- "left" 
    layout$annotation[[1]]$x <- 1.01
    layout$annotation[[1]]$xanchor <- "left"
    
  • the vertical position of the legend should stay in the middle, with yanchor <- "middle"

    layout$legend$y <- 0.5 # page middle
    layout$legend$yanchor <- "middle" 
    

    but we should compute the vertical position of the legend title annotation to remain above the legend, no matter how many entries. For now, we could hardcode a mapping in that would work for default font-sizes:

    • 8 legend entries: annotation$y <- 0.65 (from manual inspection)
    • 1 legend entry: annotation$y <- 0.52 (manual inspection)
    • -> annotation$y <- 0.14125 * number_of_legend_items - 0.48 (computed from those two points above)

    @alexcjohnson, how do you think legend titles will work in the future? a separate attribute inside legend?

  • manual legend positions from ggplot: https://github.com/ropensci/plotly/blob/add-r-cookbook-tests/tests/cookbook-test-suite/legends.R#L109-L122

cc @tdhock , @cpsievert

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