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chore: merge isoband/isolines functions #6021

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merged 2 commits into from
Aug 26, 2024
Merged

chore: merge isoband/isolines functions #6021

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148da2c
merge isoband/isolines functions
teunbrand Aug 2, 2024
6244bef
Update R/stat-contour.R
teunbrand Aug 26, 2024
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53 changes: 12 additions & 41 deletions R/stat-contour.R
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Original file line number Diff line number Diff line change
Expand Up @@ -108,7 +108,7 @@ StatContour <- ggproto("StatContour", Stat,
breaks <- contour_breaks(z.range, bins, binwidth, breaks)

isolines <- withr::with_options(list(OutDec = "."), xyz_to_isolines(data, breaks))
path_df <- iso_to_path(isolines, data$group[1])
path_df <- iso_to_geom(isolines, data$group[1], geom = "path")

path_df$level <- as.numeric(path_df$level)
path_df$nlevel <- rescale_max(path_df$level)
Expand Down Expand Up @@ -142,7 +142,7 @@ StatContourFilled <- ggproto("StatContourFilled", Stat,

isobands <- withr::with_options(list(OutDec = "."), xyz_to_isobands(data, breaks))
names(isobands) <- pretty_isoband_levels(names(isobands))
path_df <- iso_to_polygon(isobands, data$group[1])
path_df <- iso_to_geom(isobands, data$group[1], geom = "polygon")

path_df$level <- ordered(path_df$level, levels = names(isobands))
path_df$level_low <- breaks[as.numeric(path_df$level)]
Expand Down Expand Up @@ -259,51 +259,17 @@ isoband_z_matrix <- function(data) {
raster
}

#' Convert the output of isolines functions
#'
#' @param iso the output of [isoband::isolines()]
#' @param group the name of the group
#'
#' @return A data frame that can be passed to [geom_path()].
#' @noRd
#'
iso_to_path <- function(iso, group = 1) {
lengths <- vapply(iso, function(x) length(x$x), integer(1))

if (all(lengths == 0)) {
cli::cli_warn("{.fn stat_contour}: Zero contours were generated")
return(data_frame0())
}

levels <- names(iso)
xs <- unlist(lapply(iso, "[[", "x"), use.names = FALSE)
ys <- unlist(lapply(iso, "[[", "y"), use.names = FALSE)
ids <- unlist(lapply(iso, "[[", "id"), use.names = FALSE)
item_id <- rep(seq_along(iso), lengths)

# Add leading zeros so that groups can be properly sorted
groups <- paste(group, sprintf("%03d", item_id), sprintf("%03d", ids), sep = "-")
groups <- factor(groups)

data_frame0(
level = rep(levels, lengths),
x = xs,
y = ys,
piece = as.integer(groups),
group = groups,
.size = length(xs)
)
}

#' Convert the output of isoband functions
#'
#' @param iso the output of [isoband::isobands()]
#' @param iso the output of [isoband::isobands()] or [isoband::isolines()]
#' @param group the name of the group
#' @param geom The type of geometry to return. Either `"path"` or `"polygon"`
#' for isolines and isobands respectively.
#'
#' @return A data frame that can be passed to [geom_polygon()].
#' @return A data frame that can be passed to [geom_polygon()] or [geom_path()].
#' @noRd
#'
iso_to_polygon <- function(iso, group = 1) {
iso_to_geom <- function(iso, group = 1, geom = "path") {
lengths <- vapply(iso, function(x) length(x$x), integer(1))

if (all(lengths == 0)) {
Expand All @@ -319,6 +285,11 @@ iso_to_polygon <- function(iso, group = 1) {

# Add leading zeros so that groups can be properly sorted
groups <- paste(group, sprintf("%03d", item_id), sep = "-")
if (geom == "path") {
groups <- paste(groups, sprintf("%03d", ids), sep = "-")
ids <- NULL
}

groups <- factor(groups)

data_frame0(
Expand Down
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