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ggplotly.R
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#' Convert ggplot2 to plotly
#'
#' This function converts a [ggplot2::ggplot()] object to a
#' plotly object.
#'
#' @details Conversion of relative sizes depends on the size of the current
#' graphics device (if no device is open, width/height of a new (off-screen)
#' device defaults to 640/480). In other words, `height` and
#' `width` must be specified at runtime to ensure sizing is correct.
#' For examples on how to specify the output container's `height`/`width` in a
#' shiny app, see `plotly_example("shiny", "ggplotly_sizing")`.
#'
#'
#' @param p a ggplot object.
#' @param width Width of the plot in pixels (optional, defaults to automatic sizing).
#' @param height Height of the plot in pixels (optional, defaults to automatic sizing).
#' @param tooltip a character vector specifying which aesthetic mappings to show
#' in the tooltip. The default, "all", means show all the aesthetic mappings
#' (including the unofficial "text" aesthetic). The order of variables here will
#' also control the order they appear. For example, use
#' `tooltip = c("y", "x", "colour")` if you want y first, x second, and
#' colour last.
#' @param dynamicTicks should plotly.js dynamically generate axis tick labels?
#' Dynamic ticks are useful for updating ticks in response to zoom/pan
#' interactions; however, they can not always reproduce labels as they
#' would appear in the static ggplot2 image.
#' @param layerData data from which layer should be returned?
#' @param originalData should the "original" or "scaled" data be returned?
#' @param source a character string of length 1. Match the value of this string
#' with the source argument in [event_data()] to retrieve the
#' event data corresponding to a specific plot (shiny apps can have multiple plots).
#' @param ... arguments passed onto methods.
#' @export
#' @author Carson Sievert
#' @references \url{https://plotly.com/ggplot2/}
#' @seealso [plot_ly()]
#' @examples \dontrun{
#' # simple example
#' ggpenguins <- qplot(bill_length_mm , body_mass_g,
#' data = palmerpenguins::penguins, color = species)
#' ggplotly(ggpenguins)
#'
#' data(canada.cities, package = "maps")
#' viz <- ggplot(canada.cities, aes(long, lat)) +
#' borders(regions = "canada") +
#' coord_equal() +
#' geom_point(aes(text = name, size = pop), colour = "red", alpha = 1/2)
#' ggplotly(viz, tooltip = c("text", "size"))
#'
#' # linked scatterplot brushing
#' d <- highlight_key(mtcars)
#' qplot(data = d, x = mpg, y = wt) %>%
#' subplot(qplot(data = d, x = mpg, y = vs)) %>%
#' layout(title = "Click and drag to select points") %>%
#' highlight("plotly_selected")
#'
#'
#' # more brushing (i.e. highlighting) examples
#' demo("crosstalk-highlight-ggplotly", package = "plotly")
#'
#' # client-side linked brushing in a scatterplot matrix
#' highlight_key(palmerpenguins::penguins) %>%
#' GGally::ggpairs(aes(colour = Species), columns = 1:4) %>%
#' ggplotly(tooltip = c("x", "y", "colour")) %>%
#' highlight("plotly_selected")
#' }
#'
ggplotly <- function(p = ggplot2::last_plot(), width = NULL, height = NULL,
tooltip = "all", dynamicTicks = FALSE,
layerData = 1, originalData = TRUE, source = "A", ...) {
UseMethod("ggplotly", p)
}
#' @export
ggplotly.NULL <- function(...) {
htmltools::browsable(htmltools::div(...))
}
#' @export
ggplotly.plotly <- function(p = ggplot2::last_plot(), width = NULL, height = NULL,
tooltip = "all", dynamicTicks = FALSE,
layerData = 1, originalData = TRUE, source = "A", ...) {
p
}
#' @export
ggplotly.ggmatrix <- function(p = ggplot2::last_plot(), width = NULL,
height = NULL, tooltip = "all", dynamicTicks = FALSE,
layerData = 1, originalData = TRUE, source = "A", ...) {
dots <- list(...)
# provide a sensible crosstalk if none is already provided (makes ggnostic() work at least)
if (!crosstalk_key() %in% names(p$data)) {
p$data[[crosstalk_key()]] <- p$data[[".rownames"]] %||% seq_len(nrow(p$data))
attr(p$data, "set") <- dots[["set"]] %||% new_id()
}
subplotList <- list()
for (i in seq_len(p$ncol)) {
columnList <- list()
for (j in seq_len(p$nrow)) {
thisPlot <- p[j, i]
if (i == 1) {
# should the first column contain axis labels?
if (p$showYAxisPlotLabels %||% TRUE) thisPlot <- thisPlot + ylab(p$yAxisLabels[j])
} else {
# y-axes are never drawn on the interior, and diagonal plots are densities,
# so it doesn't make sense to synch zoom actions on y
thisPlot <- thisPlot + ylab(NULL) +
theme(
axis.ticks.y = element_blank(),
axis.text.y = element_blank()
)
}
columnList <- c(
columnList, list(ggplotly(
thisPlot, tooltip = tooltip, dynamicTicks = dynamicTicks,
layerData = layerData, originalData = originalData, source = source,
width = width, height = height
))
)
}
# conditioned on a column in a ggmatrix, the x-axis should be on the
# same scale.
s <- subplot(columnList, nrows = p$nrow, margin = 0.01, shareX = TRUE,
titleY = TRUE, titleX = TRUE)
subplotList <- c(subplotList, list(s))
}
s <- subplot(subplotList, nrows = 1, margin = 0.01,
titleY = TRUE, titleX = TRUE) %>%
hide_legend() %>%
layout(dragmode = "select")
if (robust_nchar(p$title) > 0) {
s <- layout(s, title = p$title)
}
for (i in seq_along(p$xAxisLabels)) {
s$x$layout[[sub("^xaxis1$", "xaxis", paste0("xaxis", i))]]$title <- p$xAxisLabels[[i]]
}
if (length(p$yAxisLabels)) {
s$x$layout$margin$l <- s$x$layout$margin$l + 50
}
config(s)
}
#' @export
ggplotly.ggplot <- function(p = ggplot2::last_plot(), width = NULL,
height = NULL, tooltip = "all", dynamicTicks = FALSE,
layerData = 1, originalData = TRUE, source = "A", ...) {
l <- gg2list(p, width = width, height = height, tooltip = tooltip,
dynamicTicks = dynamicTicks, layerData = layerData,
originalData = originalData, source = source, ...)
config(as_widget(l))
}
#' Convert a ggplot to a list.
#' @param p ggplot2 plot.
#' @param width Width of the plot in pixels (optional, defaults to automatic sizing).
#' @param height Height of the plot in pixels (optional, defaults to automatic sizing).
#' @param tooltip a character vector specifying which aesthetic tooltips to show in the
#' tooltip. The default, "all", means show all the aesthetic tooltips
#' (including the unofficial "text" aesthetic).
#' @param dynamicTicks accepts the following values: `FALSE`, `TRUE`, `"x"`, or `"y"`.
#' Dynamic ticks are useful for updating ticks in response to zoom/pan/filter
#' interactions; however, there is no guarantee they reproduce axis tick text
#' as they would appear in the static ggplot2 image.
#' @param layerData data from which layer should be returned?
#' @param originalData should the "original" or "scaled" data be returned?
#' @param source a character string of length 1. Match the value of this string
#' with the source argument in [event_data()] to retrieve the
#' event data corresponding to a specific plot (shiny apps can have multiple plots).
#' @param ... currently not used
#' @return a 'built' plotly object (list with names "data" and "layout").
#' @export
gg2list <- function(p, width = NULL, height = NULL,
tooltip = "all", dynamicTicks = FALSE,
layerData = 1, originalData = TRUE, source = "A", ...) {
# To convert relative sizes correctly, we use grid::convertHeight(),
# which requires a known output (device) size.
dev_fun <- if (capabilities("aqua") || capabilities("png")) {
grDevices::png
} else if (capabilities("jpeg")) {
grDevices::jpeg
} else if (is_installed("Cairo")) {
function(filename, ...) Cairo::Cairo(file = filename, ...)
} else {
stop(
"No Cairo or bitmap device is available. Such a graphics device is required to convert sizes correctly in ggplotly().\n\n",
" You have two options:\n",
" (1) install.packages('Cairo')\n",
" (2) compile R to use a bitmap device (png or jpeg)",
call. = FALSE
)
}
# if a device (or RStudio) is already open, use the device size as default size
if (!is.null(grDevices::dev.list()) || is_rstudio()) {
width <- width %||% default(grDevices::dev.size("px")[1])
height <- height %||% default(grDevices::dev.size("px")[2])
}
# open the device and make sure it closes on exit
dev_fun(filename = tempfile(), width = width %||% 640, height = height %||% 480)
on.exit(grDevices::dev.off(), add = TRUE)
# check the value of dynamicTicks
dynamicValues <- c(FALSE, TRUE, "x", "y")
if (length(setdiff(dynamicTicks, dynamicValues))) {
stop(
sprintf(
"`dynamicValues` accepts the following values: '%s'",
paste(dynamicValues, collapse = "', '")
), call. = FALSE
)
}
# ------------------------------------------------------------------------
# Our internal version of ggplot2::ggplot_build(). Modified from
# https://github.com/hadley/ggplot2/blob/0cd0ba/R/plot-build.r#L18-L92
# ------------------------------------------------------------------------
ggplotly_build <- function(p) {
plot <- ggfun("plot_clone")(p)
if (length(plot$layers) == 0) {
plot <- plot + geom_blank()
}
layers <- plot$layers
layer_data <- lapply(layers, function(y) y$layer_data(plot$data))
# save crosstalk sets before this attribute gets squashed
sets <- lapply(layer_data, function(y) attr(y, "set"))
scales <- plot$scales
# Apply function to layer and matching data
by_layer <- function(f) {
out <- vector("list", length(data))
for (i in seq_along(data)) {
out[[i]] <- f(l = layers[[i]], d = data[[i]])
}
out
}
# ggplot2 3.1.0.9000 introduced a Layer method named setup_layer()
# currently, LayerSf is the only core-ggplot2 Layer that makes use
# of it https://github.com/tidyverse/ggplot2/pull/2875#issuecomment-438708426
data <- layer_data
if (get_package_version("ggplot2") > "3.1.0") {
data <- by_layer(function(l, d) if (is.function(l$setup_layer)) l$setup_layer(d, plot) else d)
}
# Initialise panels, add extra data for margins & missing facetting
# variables, and add on a PANEL variable to data
layout <- ggfun("create_layout")(plot$facet, plot$coordinates)
data <- layout$setup(data, plot$data, plot$plot_env)
# save the domain of the group for display in tooltips
groupDomains <- Map(function(x, y) {
aes_g <- y$mapping[["group"]] %||% plot$mapping[["group"]]
tryNULL(rlang::eval_tidy(aes_g, x))
}, data, layers)
# for simple (StatIdentity) geoms, add crosstalk key to aes mapping
# (effectively adding it as a group)
# later on, for more complicated geoms (w/ non-trivial summary statistics),
# we construct a nested key mapping (within group)
layers <- Map(function(x, y) {
if (crosstalk_key() %in% names(y) && !"key" %in% names(x[["mapping"]]) &&
inherits(x[["stat"]], "StatIdentity")) {
# ggplot2 v3.3.4 started using the computed_mapping (instead of mapping)
# field to inform the compute_aesthetics() method, so in order to add
# the crosstalk key, we need to add to that field (when present)
# https://github.com/tidyverse/ggplot2/pull/4475
nm <- if ("computed_mapping" %in% names(x)) "computed_mapping" else "mapping"
x[[nm]] <- c(x[[nm]], key = as.name(crosstalk_key()))
}
x
}, layers, layer_data)
# Compute aesthetics to produce data with generalised variable names
data <- by_layer(function(l, d) l$compute_aesthetics(d, plot))
# add frame to group if it exists
data <- lapply(data, function(d) {
if (!"frame" %in% names(d)) return(d)
d$group <- with(d, paste(group, frame, sep = "-"))
d
})
# The computed aesthetic codes the groups as integers
# Here we build a map each of the integer values to the group label
group_maps <- Map(function(x, y) {
tryCatch({
x_group <- x[["group"]]
names(x_group) <- y
x_group <- x_group[!duplicated(x_group)]
x_group
}, error = function(e) NULL
)
}, data, groupDomains)
# Before mapping x/y position, save the domain (for discrete scales)
# to display in tooltip.
data <- lapply(data, function(d) {
d[["x_plotlyDomain"]] <- d[["x"]]
d[["y_plotlyDomain"]] <- d[["y"]]
d
})
# And since we're essentially adding an "unknown" (to ggplot2)
# aesthetic, add it to the dropped_aes field to avoid fals positive
# warnings (https://github.com/tidyverse/ggplot2/pull/4866)
layers <- lapply(layers, function(l) {
l$stat$dropped_aes <- c(l$stat$dropped_aes, "x_plotlyDomain")
l$stat$dropped_aes <- c(l$stat$dropped_aes, "y_plotlyDomain")
l
})
# Transform all scales
data <- lapply(data, scales_transform_df, scales = scales)
# Map and train positions so that statistics have access to ranges
# and all positions are numeric
scale_x <- function() scales$get_scales("x")
scale_y <- function() scales$get_scales("y")
layout$train_position(data, scale_x(), scale_y())
data <- layout$map_position(data)
# build a mapping between group and key
# if there are multiple keys within a group, the key is a list-column
reComputeGroup <- function(x, layer = NULL) {
# 1-to-1 link between data & visual marks -- group == key
if (inherits(layer$geom, "GeomDotplot")) {
x <- split(x, x[["PANEL"]])
x <- lapply(x, function(d) {
d[["group"]] <- do.call("order", d[c("x", "group")])
d
})
x <- dplyr::bind_rows(x)
}
if (inherits(layer$geom, "GeomSf")) {
x <- split(x, x[["PANEL"]])
x <- lapply(x, function(d) {
d[["group"]] <- seq_len(nrow(d))
d
})
# I think this is safe?
x <- suppressWarnings(dplyr::bind_rows(x))
}
x
}
nestedKeys <- Map(function(x, y, z) {
key <- y[[crosstalk_key()]]
if (is.null(key) || inherits(z[["stat"]], "StatIdentity")) return(NULL)
x <- reComputeGroup(x, z)
tib <- tibble::as_tibble(x[c("PANEL", "group")])
tib[["key"]] <- key
nested <- tidyr::nest(tib, key = key)
# reduce the dimensions of list column elements from 2 to 1
nested$key <- lapply(nested$key, function(x) x[[1]])
nested
}, data, layer_data, layers)
# for some geoms (e.g. boxplots) plotly.js needs the "pre-statistics" data
# we also now provide the option to return one of these two
prestats_data <- data
data <- by_layer(function(l, d) l$compute_statistic(d, layout))
data <- by_layer(function(l, d) l$map_statistic(d, plot))
# Make sure missing (but required) aesthetics are added
scales_add_missing(plot, c("x", "y"))
# Reparameterise geoms from (e.g.) y and width to ymin and ymax
data <- by_layer(function(l, d) l$compute_geom_1(d))
# compute_geom_1 can reorder the rows from `data`, making groupDomains
# invalid. We rebuild groupDomains based on the current `data` and the
# group map we built before.
groupDomains <- Map(function(x, y) {
tryCatch({
names(y)[match(x$group, y)]
}, error = function(e) NULL
)
}, data, group_maps)
# there are some geoms (e.g. geom_dotplot()) where attaching the key
# before applying the statistic can cause problems, but there is still a
# 1-to-1 corresponding between graphical marks and
# Apply position adjustments
data <- by_layer(function(l, d) l$compute_position(d, layout))
# Reset position scales, then re-train and map. This ensures that facets
# have control over the range of a plot: is it generated from what's
# displayed, or does it include the range of underlying data
layout$reset_scales()
layout$train_position(data, scale_x(), scale_y())
layout$setup_panel_params()
data <- layout$map_position(data)
# Train and map non-position scales
npscales <- scales$non_position_scales()
if (npscales$n() > 0) {
lapply(data, scales_train_df, scales = npscales)
# this for loop is unique to plotly -- it saves the "domain"
# of each non-positional scale for display in tooltips
for (sc in npscales$scales) {
data <- lapply(data, function(d) {
# scale may not be relevant for every layer data
if (any(names(d) %in% sc$aesthetics)) {
d[paste0(sc$aesthetics, "_plotlyDomain")] <- d[sc$aesthetics]
}
d
})
}
data <- lapply(data, scales_map_df, scales = npscales)
}
# Fill in defaults etc.
data <- by_layer(function(l, d) l$compute_geom_2(d))
# Let layer stat have a final say before rendering
data <- by_layer(function(l, d) l$finish_statistics(d))
# Let Layout modify data before rendering
data <- layout$finish_data(data)
# if necessary, attach key
data <- Map(function(x, y, z) {
if (!length(y)) return(x)
x <- reComputeGroup(x, z)
# dplyr issue??? https://github.com/tidyverse/dplyr/issues/2701
attr(y$group, "n") <- NULL
# https://github.com/plotly/plotly.R/issues/2013
if (!identical(class(x$group), class(y$group))) {
x$group <- as.character(x$group)
y$group <- as.character(y$group)
}
suppressMessages(dplyr::left_join(x, y))
}, data, nestedKeys, layers)
structure(
list(
data = data, layout = layout, plot = plot,
env = environment()
),
class = "ggplot_built"
)
}
# Allow thematic to add new defaults to the plot object based on it's theme
built <- if (isNamespaceLoaded("thematic")) {
tns <- asNamespace("thematic")
tns$ggthematic_build(p, ggplotly_build, tns$thematic_get_theme(resolve = TRUE))
} else {
ggplotly_build(p)
}
# Assign all the objects available to ggplotly_build() to this functions environment
built_env <- built$env
envir <- environment()
for (var in ls(built_env)) {
assign(var, built_env[[var]], envir = envir)
}
theme <- calculated_theme_elements(plot)
# Translate plot wide theme elements to plotly.js layout
pm <- unitConvert(theme$plot.margin, "pixels")
gglayout <- list(
margin = list(t = pm[[1]], r = pm[[2]], b = pm[[3]], l = pm[[4]]),
plot_bgcolor = toRGB(theme$panel.background$fill),
paper_bgcolor = toRGB(theme$plot.background$fill),
font = text2font(theme$text)
)
# main plot title
if (robust_nchar(plot$labels$title) > 0) {
gglayout$title <- list(
text = faced(plot$labels$title, theme$plot.title$face),
font = text2font(theme$plot.title),
# don't translate vjust to y since they since have very different meaning...
# y is allowed to span the paper coordinate whereas vjust it local to it's grob
x = theme$plot.title$hjust,
xref = "paper"
)
gglayout$margin$t <- gglayout$margin$t + gglayout$title$font$size
}
# ensure there's enough space for the modebar (this is based on a height of 1em)
# https://github.com/plotly/plotly.js/blob/dd1547/src/components/modebar/index.js#L171
gglayout$margin$t <- gglayout$margin$t + 16
# important stuff like layout$panel_params is already flipped, but
# plot$scales/plot$labels/data aren't. We flip x/y trace data at the very end
# and scales in the axis loop below.
if (inherits(plot$coordinates, "CoordFlip")) {
plot$labels[c("x", "y")] <- plot$labels[c("y", "x")]
}
# important panel summary stats
nPanels <- nrow(layout$layout)
nRows <- max(layout$layout$ROW)
nCols <- max(layout$layout$COL)
# panel -> plotly.js axis/anchor info
# (assume a grid layout by default)
layout$layout <- dplyr::mutate(
layout$layout,
xaxis = COL,
yaxis = ROW,
xanchor = nRows,
yanchor = 1L
)
if (inherits(plot$facet, "FacetWrap")) {
if (plot$facet$params$free$x && plot$facet$params$free$y) {
layout$layout <- dplyr::mutate(
layout$layout,
xaxis = PANEL,
yaxis = PANEL,
xanchor = PANEL,
yanchor = PANEL
)
} else if (plot$facet$params$free$x) {
layout$layout <- dplyr::mutate(
layout$layout,
xaxis = PANEL,
xanchor = ROW
)
} else if (plot$facet$params$free$y) {
layout$layout <- dplyr::mutate(
layout$layout,
yaxis = PANEL,
yanchor = COL
)
}
# anchor X axis to the lowest plot in its column
layout$layout <- dplyr::group_by(layout$layout, !!rlang::sym("xaxis"))
layout$layout <- dplyr::mutate(layout$layout, xanchor = max(as.integer(yaxis)))
}
layout$layout <- as.data.frame(layout$layout)
# format the axis/anchor to a format plotly.js respects
layout$layout$xaxis <- paste0("xaxis", sub("^1$", "", layout$layout$xaxis))
layout$layout$yaxis <- paste0("yaxis", sub("^1$", "", layout$layout$yaxis))
layout$layout$xanchor <- paste0("y", sub("^1$", "", layout$layout$xanchor))
layout$layout$yanchor <- paste0("x", sub("^1$", "", layout$layout$yanchor))
# for some layers2traces computations, we need the range of each panel
layout$layout$x_min <- sapply(layout$panel_params, function(z) { min(z[["x"]]$dimension %()% z$x.range %||% z$x_range) })
layout$layout$x_max <- sapply(layout$panel_params, function(z) { max(z[["x"]]$dimension %()% z$x.range %||% z$x_range) })
layout$layout$y_min <- sapply(layout$panel_params, function(z) { min(z[["y"]]$dimension %()% z$y.range %||% z$y_range) })
layout$layout$y_max <- sapply(layout$panel_params, function(z) { max(z[["y"]]$dimension %()% z$y.range %||% z$y_range) })
# layers -> plotly.js traces
plot$tooltip <- tooltip
data <- Map(function(x, y) {
tryCatch({ x$group_plotlyDomain <- y; x }, error = function(e) x)
}, data, groupDomains)
# reattach crosstalk key-set attribute
data <- Map(function(x, y) structure(x, set = y), data, sets)
traces <- layers2traces(data, prestats_data, layout, plot)
gglayout <- layers2layout(gglayout, layers, layout$layout)
# default to just the text in hover info, mainly because of this
# https://github.com/plotly/plotly.js/issues/320
traces <- lapply(traces, function(tr) {
tr$hoverinfo <- tr$hoverinfo %||%"text"
tr
})
# show only one legend entry per legendgroup
grps <- sapply(traces, "[[", "legendgroup")
traces <- Map(function(x, y) {
if (!is.null(x[["frame"]])) return(x)
x$showlegend <- isTRUE(x$showlegend) && y
x
}, traces, !duplicated(grps))
# ------------------------------------------------------------------------
# axis/facet/margin conversion
# ------------------------------------------------------------------------
# panel margins must be computed before panel/axis loops
# (in order to use get_domains())
panelMarginX <- unitConvert(
theme[["panel.spacing.x"]] %||% theme[["panel.spacing"]],
"npc", "width"
)
panelMarginY <- unitConvert(
theme[["panel.spacing.y"]] %||% theme[["panel.spacing"]],
"npc", "height"
)
# space for _interior_ facet strips
if (inherits(plot$facet, "FacetWrap")) {
stripSize <- unitConvert(
theme[["strip.text.x"]] %||% theme[["strip.text"]],
"npc", "height"
)
panelMarginY <- panelMarginY + stripSize
# space for ticks/text in free scales
if (plot$facet$params$free$x) {
axisTicksX <- unitConvert(
theme[["axis.ticks.x"]] %||% theme[["axis.ticks"]],
"npc", "height"
)
# allocate enough space for the _longest_ text label
axisTextX <- theme[["axis.text.x"]] %||% theme[["axis.text"]]
labz <- unlist(lapply(layout$panel_params, function(pp) { pp[["x"]]$get_labels %()% pp$x.labels }))
lab <- longest_element(labz)
panelMarginY <- panelMarginY + axisTicksX +
bbox(lab, axisTextX$angle, unitConvert(axisTextX, "npc", "height"))[["height"]]
}
if (plot$facet$params$free$y) {
axisTicksY <- unitConvert(
theme[["axis.ticks.y"]] %||% theme[["axis.ticks"]],
"npc", "width"
)
# allocate enough space for the _longest_ text label
axisTextY <- theme[["axis.text.y"]] %||% theme[["axis.text"]]
labz <- unlist(lapply(layout$panel_params, function(pp) { pp[["y"]]$get_labels %()% pp$y.labels }))
lab <- longest_element(labz)
panelMarginX <- panelMarginX + axisTicksY +
bbox(lab, axisTextY$angle, unitConvert(axisTextY, "npc", "width"))[["width"]]
}
}
margins <- c(
rep(panelMarginX, 2),
rep(panelMarginY, 2)
)
doms <- get_domains(nPanels, nRows, margins)
for (i in seq_len(nPanels)) {
lay <- layout$layout[i, ]
for (xy in c("x", "y")) {
# find axis specific theme elements that inherit from their parent
theme_el <- function(el) {
theme[[paste0(el, ".", xy)]] %||% theme[[el]]
}
axisTicks <- theme_el("axis.ticks")
axisText <- theme_el("axis.text")
axisTitle <- theme_el("axis.title")
axisLine <- theme_el("axis.line")
panelGrid <- theme_el("panel.grid.major") %||% theme_el("panel.grid")
stripText <- theme_el("strip.text")
axisName <- lay[, paste0(xy, "axis")]
anchor <- lay[, paste0(xy, "anchor")]
rng <- layout$panel_params[[i]]
# panel_params is quite different for "CoordSf"
if ("CoordSf" %in% class(p$coordinates)) {
# see CoordSf$render_axis_v
direction <- if (xy == "x") "E" else "N"
idx <- rng$graticule$type == direction &
!is.na(rng$graticule$degree_label) &
# Respect the logical 'plot12' column which sf constructs for
# determining which tick labels should be drawn
# https://github.com/r-spatial/sf/blob/b49d37/R/graticule.R#L199
# https://github.com/r-spatial/sf/blob/52a8351/R/plot.R#L580
(rng$graticule$plot12 %||% TRUE)
tickData <- rng$graticule[idx, ]
# TODO: how to convert a language object to unicode character string?
rng[[paste0(xy, ".labels")]] <- sub(
"\\*\\s+degree[ ]?[\\*]?", "°",
gsub("\"", "", tickData[["degree_label"]])
)
rng[[paste0(xy, ".major")]] <- tickData[[paste0(xy, "_start")]]
# If it doesn't already exist (for this panel),
# generate graticule (as done in, CoordSf$render_bg)
isGrill <- vapply(traces, function(tr) {
identical(tr$xaxis, lay$xaxis) &&
identical(tr$yaxis, lay$yaxis) &&
isTRUE(tr$`_isGraticule`)
}, logical(1))
if (sum(isGrill) == 0) {
# TODO: reduce the number of points (via coord_munch?)
d <- fortify_sf(rng$graticule)
d$x <- scales::rescale(d$x, rng$x_range, from = c(0, 1))
d$y <- scales::rescale(d$y, rng$y_range, from = c(0, 1))
params <- list(
colour = panelGrid$colour,
linetype = panelGrid$linetype
)
nm <- linewidth_or_size(panelGrid)
params[[nm]] <- panelGrid[[nm]]
grill <- geom2trace.GeomPath(d, params)
grill$hoverinfo <- "none"
grill$showlegend <- FALSE
grill$`_isGraticule` <- TRUE
grill$xaxis <- sub("axis", "", lay$xaxis)
grill$yaxis <- sub("axis", "", lay$yaxis)
traces <- c(list(grill), traces)
}
# if labels are empty, don't show axis ticks
tickExists <- with(rng$graticule, sapply(degree_label, is.language))
if (sum(tickExists) == 0) {
theme$axis.ticks.length <- 0
}
}
# stuff like layout$panel_params is already flipped, but scales aren't
sc <- if (inherits(plot$coordinates, "CoordFlip")) {
scales$get_scales(setdiff(c("x", "y"), xy))
} else {
scales$get_scales(xy)
}
# type of unit conversion
type <- if (xy == "x") "height" else "width"
# get axis title
axisTitleText <- sc$name %||% plot$labels[[xy]] %||% ""
if (is_blank(axisTitle)) axisTitleText <- ""
# is this axis dynamic?
isDynamic <- isTRUE(dynamicTicks) || identical(dynamicTicks, xy)
if (isDynamic && !p$coordinates$is_linear()) {
warning(
"`dynamicTicks` is only supported for linear (i.e., cartesian) coordinates",
call. = FALSE
)
}
# determine axis types
isDate <- inherits(sc, c("ScaleContinuousDatetime", "ScaleContinuousDate"))
isDateType <- isDynamic && isDate
isDiscrete <- inherits(sc, "ScaleDiscretePosition")
isDiscreteType <- isDynamic && isDiscrete
# In 3.2.x .major disappeared in favor of break_positions()
# (tidyverse/ggplot2#3436), but with 3.4.x break_positions() no longer
# yields the actual final positions on a 0-1 scale, but .major does
# (tidyverse/ggplot2#5029)
ticktext <- rng[[paste0(xy, ".labels")]] %||% rng[[xy]]$get_labels()
tickvals <- rng[[paste0(xy, ".major")]] %||% rng[[xy]]$break_positions()
# https://github.com/tidyverse/ggplot2/pull/3566#issuecomment-565085809
hasTickText <- !(is.na(ticktext) | is.na(tickvals))
ticktext <- ticktext[hasTickText]
tickvals <- tickvals[hasTickText]
axisObj <- list(
# TODO: log type?
type = if (isDateType) "date" else if (isDiscreteType) "category" else "linear",
autorange = isDynamic,
range = rng[[xy]]$dimension %()% rng[[paste0(xy, ".range")]] %||% rng[[paste0(xy, "_range")]],
tickmode = if (isDynamic) "auto" else "array",
ticktext = ticktext,
tickvals = tickvals,
categoryorder = "array",
categoryarray = ticktext,
nticks = nrow(rng),
ticks = if (is_blank(axisTicks)) "" else "outside",
tickcolor = toRGB(axisTicks$colour),
ticklen = unitConvert(theme$axis.ticks.length, "pixels", type),
tickwidth = unitConvert(axisTicks, "pixels", type),
showticklabels = !is_blank(axisText),
tickfont = text2font(axisText, type),
tickangle = - (axisText$angle %||% 0),
showline = !is_blank(axisLine),
linecolor = toRGB(axisLine$colour),
linewidth = unitConvert(axisLine, "pixels", type),
# TODO: always `showgrid=FALSE` and implement our own using traces
showgrid = !is_blank(panelGrid) && !"CoordSf" %in% class(p$coordinates),
domain = sort(as.numeric(doms[i, paste0(xy, c("start", "end"))])),
gridcolor = toRGB(panelGrid$colour),
gridwidth = unitConvert(panelGrid, "pixels", type),
zeroline = FALSE,
anchor = anchor,
# layout.axisid.title don't yet support alignment :(
title = list(
text = faced(axisTitleText, axisTitle$face),
font = text2font(axisTitle)
)
)
# set scaleanchor/scaleratio if these are fixed coordinates
# the logic here is similar to what p$coordinates$aspect() does,
# but the ratio is scaled to the data range by plotly.js
fixed_coords <- c("CoordSf", "CoordFixed", "CoordMap", "CoordQuickmap")
if (inherits(p$coordinates, fixed_coords)) {
axisObj$scaleanchor <- anchor
ratio <- p$coordinates$ratio %||% 1
axisObj$scaleratio <- if (xy == "y") ratio else 1 / ratio
if (inherits(p$coordinates, "CoordSf")) {
if (isTRUE(sf::st_is_longlat(rng$crs))) {
ratio <- cos(mean(rng$y_range) * pi/180)
}
# note how ratio is flipped in CoordSf$aspect() vs CoordFixed$aspect()
axisObj$scaleratio <- if (xy == "y") 1 / ratio else ratio
}
}
# TODO: seems like we _could_ support this with scaleanchors,
# but inverse transform by the panel ranges?
# also, note how aspect.ratio overwrites fixed coordinates:
# ggplot(mtcars, aes(wt, mpg)) + geom_point() + coord_fixed(0.5)
# ggplot(mtcars, aes(wt, mpg)) + geom_point() + coord_fixed(0.5) + theme(aspect.ratio = 1)
if (!is.null(theme$aspect.ratio)) {
warning(
"Aspect ratios aren't yet implemented, but you can manually set",
" a suitable height/width", call. = FALSE
)
}
# tickvals are currently on 0-1 scale, but we want them on data scale
axisObj$tickvals <- scales::rescale(
axisObj$tickvals, to = axisObj$range, from = c(0, 1)
)
# inverse transform date data based on tickvals/ticktext
invert_date <- function(x, scale) {
if (inherits(scale, "ScaleContinuousDatetime")) {
as.POSIXct(x, origin = "1970-01-01", tz = scale$timezone)
} else {
as.Date(x, origin = "1970-01-01", tz = scale$timezone)
}
}
if (isDateType) {
axisObj$range <- invert_date(axisObj$range, sc)
traces <- lapply(traces, function(tr) {
tr[[xy]] <- invert_date(tr[[xy]], sc)
# TODO: are there other similar cases we need to handle?
if (identical("bar", tr$type)) {
tr[["width"]] <- invert_date(tr[["width"]], sc)
}
tr
})
}
# inverse transform categorical data based on tickvals/ticktext
if (isDiscreteType) {
traces <- lapply(traces, function(tr) {
# map x/y trace data back to the 'closest' ticktext label
# http://r.789695.n4.nabble.com/check-for-nearest-value-in-a-vector-td4369339.html
tr[[xy]]<- vapply(tr[[xy]], function(val) {
with(axisObj, ticktext[[which.min(abs(tickvals - val))]])
}, character(1))
tr
})
if ("dodge" %in% sapply(layers, ggtype, "position")) gglayout$barmode <- "dodge"
}
# attach axis object to the layout
gglayout[[axisName]] <- axisObj
# do some stuff that should be done once for the entire plot
is_x <- xy == "x"
if (i == 1) {
# Split ticktext elements by "\n" to account for linebreaks
axisTickText <- strsplit(as.character(axisObj$ticktext), split = "\n", fixed = TRUE)
axisTickText <- longest_element(unlist(axisTickText))
side <- if (is_x) "b" else "l"
# account for axis ticks, ticks text, and titles in plot margins
# (apparently ggplot2 doesn't support axis.title/axis.text margins)
gglayout$margin[[side]] <- gglayout$margin[[side]] + axisObj$ticklen +
bbox(axisTickText, axisObj$tickangle, axisObj$tickfont$size)[[type]] +
bbox(axisTitleText, axisTitle$angle, unitConvert(axisTitle, "pixels", type))[[type]]
if (robust_nchar(axisTitleText) > 0) {
axisTextSize <- unitConvert(axisText, "npc", type)
axisTitleSize <- unitConvert(axisTitle, "npc", type)
}
# add space for exterior facet strips in `layout.margin`
if (has_facet(plot)) {
stripSize <- unitConvert(stripText, "pixels", type)
if (is_x) {
gglayout$margin$t <- gglayout$margin$t + stripSize
}
if (is_x && inherits(plot$facet, "FacetGrid")) {
gglayout$margin$r <- gglayout$margin$r + stripSize
}
# facets have multiple axis objects, but only one title for the plot,
# so we empty the titles and try to draw the title as an annotation
if (robust_nchar(axisTitleText) > 0) {
axisAnn <- make_label(
faced(axisTitleText, axisTitle$face),
el = axisTitle,
x = if (is_x) 0.5 else 0,
y = if (is_x) 0 else 0.5,
xanchor = if (is_x) "center" else "right",
yanchor = if (is_x) "top" else "center",
annotationType = "axis"
)
textMargin <- sum(axisText$margin[if (is_x) c(1, 3) else c(2, 4)])
class(textMargin) <- setdiff(class(textMargin), "margin")
titleMargin <- axisTitle$margin[if (is_x) 1 else 2]
class(titleMargin) <- setdiff(class(titleMargin), "margin")
offset <- bbox(axisTickText, axisText$angle, axisTextSize)[[type]] +
unitConvert(theme$axis.ticks.length, "npc", type) +
unitConvert(textMargin, "npc", type) +
unitConvert(titleMargin, "npc", type)
offset <- unitConvert(grid::unit(offset, "npc"), "pixels", type)
shift <- if (is_x) "yshift" else "xshift"
axisAnn[[1]][[shift]] <- -1 * offset
gglayout$annotations <- c(gglayout$annotations, axisAnn)
}
}
}
if (has_facet(plot)) gglayout[[axisName]]$title <- ""
} # end of axis loop
# theme(panel.border = ) -> plotly rect shape
xdom <- gglayout[[lay[, "xaxis"]]]$domain
ydom <- gglayout[[lay[, "yaxis"]]]$domain
border <- make_panel_border(xdom, ydom, theme)
gglayout$shapes <- c(gglayout$shapes, border)
# facet strips -> plotly annotations
if (has_facet(plot)) {
col_vars <- ifelse(inherits(plot$facet, "FacetWrap"), "facets", "cols")
col_txt <- if (!length(names(plot$facet$params[[col_vars]])) == 0) {
paste(
plot$facet$params$labeller(
lay[names(plot$facet$params[[col_vars]])]
), collapse = br()
)
} else {
""
}
if (is_blank(theme[["strip.text.x"]])) col_txt <- ""
if (inherits(plot$facet, "FacetGrid") && lay$ROW != 1) col_txt <- ""
if (robust_nchar(col_txt) > 0) {
col_lab <- make_label(
col_txt, x = mean(xdom), y = max(ydom),
el = theme[["strip.text.x"]] %||% theme[["strip.text"]],
xanchor = "center", yanchor = "bottom"
)
gglayout$annotations <- c(gglayout$annotations, col_lab)
strip <- make_strip_rect(xdom, ydom, theme, "top")
gglayout$shapes <- c(gglayout$shapes, strip)
}
# Only FacetGrid has no cols
if (inherits(plot$facet, "FacetGrid")) {
row_txt <- if (!length(names(plot$facet$params$rows)) == 0) {
paste(
plot$facet$params$labeller(
lay[names(plot$facet$params$rows)]
),
collapse = br()
)
} else {
""
}
if (is_blank(theme[["strip.text.y"]])) row_txt <- ""
if (lay$COL != nCols) row_txt <- ""
if (robust_nchar(row_txt) > 0) {
row_lab <- make_label(
row_txt, x = max(xdom), y = mean(ydom),
el = theme[["strip.text.y"]] %||% theme[["strip.text"]],
xanchor = "left", yanchor = "middle"
)
gglayout$annotations <- c(gglayout$annotations, row_lab)
strip <- make_strip_rect(xdom, ydom, theme, "right")
gglayout$shapes <- c(gglayout$shapes, strip)
}
}
}
} # end of panel loop
# ------------------------------------------------------------------------
# guide conversion
# Strategy: Obtain and translate the output of ggplot2:::guides_train().
# To do so, we borrow some of the body of ggplot2:::guides_build().
# ------------------------------------------------------------------------
# will there be a legend?
gglayout$showlegend <- sum(unlist(lapply(traces, "[[", "showlegend"))) >= 1
# legend styling
gglayout$legend <- list(
bgcolor = toRGB(theme$legend.background$fill),
bordercolor = toRGB(theme$legend.background$colour),
borderwidth = unitConvert(
theme$legend.background[[linewidth_or_size(theme$legend.background)]],
"pixels", "width"
),
font = text2font(theme$legend.text)
)
# if theme(legend.position = "none") is used, don't show a legend _or_ guide
if (npscales$n() == 0 || identical(theme$legend.position, "none")) {
gglayout$showlegend <- FALSE
} else {
# by default, guide boxes are vertically aligned
theme$legend.box <- theme$legend.box %||% "vertical"
# size of key (also used for bar in colorbar guide)
theme$legend.key.width <- theme$legend.key.width %||% theme$legend.key.size
theme$legend.key.height <- theme$legend.key.height %||% theme$legend.key.size
# legend direction must be vertical