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Add ggalluvial support #2044

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Add ggalluvial support #2044

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c2621ac
Closes #1614. Implemented `to_basic` for the `geom_alluvium` and `geo…
moutikabdessabour Oct 12, 2021
5d8ce0a
Added visual tests for this implementation
moutikabdessabour Oct 12, 2021
5861f68
Conforming with the review
moutikabdessabour Oct 12, 2021
bdef939
Conforming with the review
moutikabdessabour Oct 12, 2021
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29 changes: 29 additions & 0 deletions R/layers2traces.R
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Expand Up @@ -613,6 +613,35 @@ to_basic.GeomQuantile <- function(data, prestats_data, layout, params, p, ...){
dat
}

#' @export
to_basic.GeomStratum <- function (data, ...) {
to_basic.GeomRect(data, ...)
}

#' @export
to_basic.GeomAlluvium <- function (data, ...) {
prefix_class(transform_alluvium(data), "GeomPolygon")
}

# transform the alluvium data into the corresponding polygons
transform_alluvium <- function(data) {
data <- data[order(data$x), ]

if(unique(data$colour) == 0) data$colour <- NULL
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I'm not sure what this is doing, but it seems you want length(), not unique()?

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@moutikabdessabour moutikabdessabour Oct 12, 2021 •
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geom_alluvium by default generates a data.frame with a colour column and sets it to 0. This behaviour results in an error when trying to get the colour from the number and grid::col2rgb complains that colors must be positive integers. I got around this by removing the colour column if no color aesthetic is passed by the user.

Error in grDevices::col2rgb(x, alpha = TRUE) : 
  numerical color values must be positive

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This check needs to be more careful. If unique(data$colour) is not of length 1, the if will warn/error:

> if(c("a", "b") == 0) print("foo")
Warning message:
In if (c("a", "b") == 0) print("foo") :
  the condition has length > 1 and only the first element will be used


unused_aes <- ! names(data) %in% c("x", "y", "ymin", "ymax")

row_number <- nrow(data)

data_rev <- data[rev(seq_len(row_number)), ]

structure(rbind(
cbind(x = data$x, y = data$ymin, data[unused_aes]),
cbind(x = data$x[row_number], y = data$ymin[row_number], data[row_number, unused_aes]),
cbind(x = data_rev$x, y = data_rev$ymax, data_rev[unused_aes])
), class = class(data))
}

#' @export
to_basic.default <- function(data, prestats_data, layout, params, p, ...) {
data
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