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utils.R
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is.plotly <- function(x) {
inherits(x, "plotly")
}
is.formula <- function(f) {
inherits(f, "formula")
}
is.colorbar <- function(tr) {
inherits(tr, "plotly_colorbar")
}
is.evaled <- function(p) {
all(vapply(p$x$attrs, function(attr) inherits(attr, "plotly_eval"), logical(1)))
}
is.webgl <- function(p) {
if (!is.evaled(p)) p <- plotly_build(p)
types <- vapply(p$x$data, function(tr) tr[["type"]] %||% "scatter", character(1))
any(types %in% glTypes())
}
glTypes <- function() {
c(
"scattergl", "scatter3d", "mesh3d", "heatmapgl", "pointcloud", "parcoords",
"surface"
)
}
# just like ggplot2:::is.discrete()
is.discrete <- function(x) {
is.factor(x) || is.character(x) || is.logical(x)
}
"%||%" <- function(x, y) {
if (length(x) > 0 || is_blank(x)) x else y
}
"%()%" <- function(x, y) {
if (is.function(x)) return(x())
y
}
# kind of like %||%, but only respects user-defined defaults
# (instead of defaults provided in the build step)
"%|D|%" <- function(x, y) {
if (!is.default(x)) x %||% y else y
}
# standard way to specify a line break
br <- function() "<br />"
is.default <- function(x) {
inherits(x, "plotly_default")
}
default <- function(x) {
prefix_class(x %||% list(), "plotly_default")
}
compact <- function(x) {
Filter(Negate(is.null), x)
}
modify_list <- function(x, y, ...) {
modifyList(x %||% list(), y %||% list(), ...)
}
# convert a vector of dates/date-times to milliseconds
to_milliseconds <- function(x) {
if (inherits(x, "Date")) return(as.numeric(x) * 86400000)
if (inherits(x, "POSIXt")) return(as.numeric(x) * 1000)
# throw warning?
x
}
# apply a function to x, retaining class and "special" plotly attributes
retain <- function(x, f = identity) {
y <- structure(f(x), class = oldClass(x))
attrs <- attributes(x)
# TODO: do we set any other "special" attributes internally
# (grepping "structure(" suggests no)
attrs <- attrs[names(attrs) %in% "apiSrc"]
if (length(attrs)) {
attributes(y) <- attrs
}
y
}
deparse2 <- function(x) {
if (is.null(x) || !is.language(x)) return(NULL)
sub("^~", "", paste(deparse(x, 500L), collapse = ""))
}
new_id <- function() {
basename(tempfile(""))
}
names2 <- function(x) {
names(x) %||% rep("", length(x))
}
getLevels <- function(x) {
if (is.factor(x)) levels(x) else sort(unique(x))
}
tryNULL <- function(expr) tryCatch(expr, error = function(e) NULL)
# Don't attempt to do "tidy" data training on these trace types
# Note that non-tidy traces expect/anticipate data_array's of varying lengths
is_tidy <- function(trace) {
type <- trace[["type"]] %||% "scatter"
!type %in% c(
"mesh3d", "heatmap", "histogram2d", "isosurface",
"histogram2dcontour", "contour", "surface"
)
}
# is grouping relevant for this geometry? (e.g., grouping doesn't effect a scatterplot)
has_group <- function(trace) {
inherits(trace, paste0("plotly_", c("segment", "path", "line", "polygon"))) ||
(grepl("scatter", trace[["type"]]) && grepl("lines", trace[["mode"]]))
}
# currently implemented non-positional scales in plot_ly()
npscales <- function() {
c("color", "stroke", "symbol", "linetype", "size", "span", "split")
}
colorway <- function(p = NULL) {
colway <- p$x$layout$colorway %||% Schema$layout$layoutAttributes$colorway$dflt
lapply(as.list(colway), function(x) structure(x, class = "colorway"))
}
# column name for crosstalk key
# TODO: make this more unique?
crosstalk_key <- function() ".crossTalkKey"
# arrange data if the vars exist, don't throw error if they don't
arrange_safe <- function(data, vars) {
vars <- vars[vars %in% names(data)]
if (length(vars)) dplyr::arrange_(data, .dots = vars) else data
}
is_mapbox <- function(p) {
identical(p$x$layout[["mapType"]], "mapbox")
}
is_geo <- function(p) {
identical(p$x$layout[["mapType"]], "geo")
}
is_type <- function(p, type) {
types <- vapply(p$x$data, function(tr) tr[["type"]] %||% "scatter", character(1))
all(types %in% type)
}
# Replace elements of a nested list
#
# @param x a named list
# @param indicies a vector of indices.
# A 1D list may be used to specify both numeric and non-numeric inidices
# @param val the value used to
# @examples
#
# x <- list(a = 1)
# # equivalent to `x$a <- 2`
# re_place(x, "a", 2)
#
# y <- list(a = list(list(b = 2)))
#
# # equivalent to `y$a[[1]]$b <- 2`
# y <- re_place(y, list("a", 1, "b"), 3)
# y
re_place <- function(x, indicies = 1, val) {
expr <- call("[[", quote(x), indicies[[1]])
if (length(indicies) == 1) {
eval(call("<-", expr, val))
return(x)
}
for (i in seq(2, length(indicies))) {
expr <- call("[[", expr, indicies[[i]])
}
eval(call("<-", expr, val))
x
}
# retrive mapbox token if one is set; otherwise, throw error
mapbox_token <- function() {
token <- Sys.getenv("MAPBOX_TOKEN", NA)
if (is.na(token)) {
stop(
"No mapbox access token found. Obtain a token here\n",
"https://www.mapbox.com/help/create-api-access-token/\n",
"Once you have a token, assign it to an environment variable \n",
"named 'MAPBOX_TOKEN', for example,\n",
"Sys.setenv('MAPBOX_TOKEN' = 'secret token')", call. = FALSE
)
}
token
}
fit_bounds <- function(p) {
# Compute layout.mapboxid._fitBounds, an internal attr that has special client-side logic
# PS. how the hell does mapbox not have a way to set initial map bounds?
# https://github.com/mapbox/mapbox-gl-js/issues/1970
mapboxIDs <- grep("^mapbox", sapply(p$x$data, "[[", "subplot"), value = TRUE)
for (id in mapboxIDs) {
bboxes <- lapply(p$x$data, function(tr) if (identical(id, tr$subplot)) tr[["_bbox"]])
rng <- bboxes2range(bboxes, f = 0.01)
if (!length(rng)) next
# intentionally an array of numbers in [west, south, east, north] order
# https://www.mapbox.com/mapbox-gl-js/api/#lnglatboundslike
p$x$layout[[id]]$`_fitBounds` <- list(
bounds = c(
min(rng$xrng),
min(rng$yrng),
max(rng$xrng),
max(rng$yrng)
),
options = list(
padding = 10,
linear = FALSE,
# NOTE TO SELF: can do something like this to customize easing
# easing = htmlwidgets::JS("function(x) { return 1; }"),
offset = c(0, 0)
)
)
p$x$layout[[id]]$center$lat <- mean(rng$yrng)
p$x$layout[[id]]$center$lon <- mean(rng$xrng)
}
# Compute layout.geoid.lonaxis.range & layout.geoid.lataxis.range
# for scattergeo
geoIDs <- grep("^geo", sapply(p$x$data, "[[", "geo"), value = TRUE)
for (id in geoIDs) {
bboxes <- lapply(p$x$data, function(tr) if (identical(id, tr$geo)) tr[["_bbox"]])
rng <- bboxes2range(bboxes, f = 0.01)
if (!length(rng)) next
p$x$layout[[id]]$lataxis$range <- rng$yrng
p$x$layout[[id]]$lonaxis$range <- rng$xrng
}
# Compute layout.axisid.scaleanchor & layout.axisid.scaleratio
# for scatter/scattergl
rows <- compact(lapply(p$x$data, function(x) c(x[["xaxis"]], x[["yaxis"]])))
for (i in seq_along(rows)) {
xid <- rows[[i]][[1]]
yid <- rows[[i]][[2]]
bboxes <- lapply(p$x$data, function(tr) {
if (identical(xid, tr$xaxis) && identical(yid, tr$yaxis)) tr[["_bbox"]]
})
rng <- bboxes2range(bboxes, f = 0.01)
if (!length(rng)) next
xname <- sub("x", "xaxis", xid)
yname <- sub("y", "yaxis", yid)
# default to empty axes
# TODO: is there a set of projections where it makes sense to show a cartesian grid?
eaxis <- list(showgrid = FALSE, zeroline = FALSE, ticks = "", showticklabels = FALSE)
p$x$layout[[xname]] <- modify_list(eaxis, p$x$layout[[xname]])
p$x$layout[[yname]] <- modify_list(eaxis, p$x$layout[[yname]])
# remove default axis titles
p$x$layout[[xname]]$title <- p$x$layout[[xname]]$title %|D|% NULL
p$x$layout[[yname]]$title <- p$x$layout[[yname]]$title %|D|% NULL
p$x$layout[[xname]]$scaleanchor <- yid
# TODO: only do this for lat/lon dat
p$x$layout[[xname]]$scaleratio <- cos(mean(rng$yrng) * pi/180)
}
# Internal _bbox field no longer needed
#p$x$data <- lapply(p$x$data, function(tr) { tr[["_bbox"]] <- NULL; tr })
p
}
# find the x/y layout range of a collection of trace._bboxes
bboxes2range <- function(bboxes, ...) {
if (sum(lengths(bboxes)) == 0) return(NULL)
yrng <- c(
min(unlist(lapply(bboxes, "[[", "ymin")), na.rm = TRUE),
max(unlist(lapply(bboxes, "[[", "ymax")), na.rm = TRUE)
)
xrng <- c(
min(unlist(lapply(bboxes, "[[", "xmin")), na.rm = TRUE),
max(unlist(lapply(bboxes, "[[", "xmax")), na.rm = TRUE)
)
list(
yrng = grDevices::extendrange(yrng, ...),
xrng = grDevices::extendrange(xrng, ...)
)
}
# rename attrs (unevaluated arguments) from geo locations (lat/lon) to cartesian
geo2cartesian <- function(p) {
p$x$attrs <- lapply(p$x$attrs, function(tr) {
tr[["x"]] <- tr[["x"]] %||% tr[["lat"]]
tr[["y"]] <- tr[["y"]] %||% tr[["lon"]]
tr
})
p
}
cartesian2geo <- function(p) {
p$x$data <- lapply(p$x$data, function(tr) {
if (isTRUE(tr[["type"]] %in% c("scattermapbox", "scattergeo"))) {
tr[["lat"]] <- tr[["lat"]] %||% tr[["y"]]
tr[["lon"]] <- tr[["lon"]] %||% tr[["x"]]
tr[c("x", "y")] <- NULL
}
tr
})
p
}
is_subplot <- function(p) {
isTRUE(p$x$subplot)
}
supply_defaults <- function(p) {
# no need to supply defaults for subplots
if (is_subplot(p)) return(p)
# supply trace anchor defaults
anchors <- if (is_geo(p)) c("geo" = "geo") else if (is_mapbox(p)) c("subplot" = "mapbox") else c("xaxis" = "x", "yaxis" = "y")
p$x$data <- lapply(p$x$data, function(tr) {
for (i in seq_along(anchors)) {
key <- names(anchors)[[i]]
if (!has_attr(tr[["type"]] %||% "scatter", key)) next
tr[[key]] <- sub("^y1$", "y", sub("^x1$", "x", tr[[key]][1])) %||% anchors[[i]]
}
tr
})
# hack to avoid https://github.com/ropensci/plotly/issues/945
if (is_type(p, "parcoords")) p$x$layout$margin$t <- NULL
# supply domain defaults
geoDomain <- list(x = c(0, 1), y = c(0, 1))
if (is_geo(p) || is_mapbox(p)) {
p$x$layout[grepl("^[x-y]axis", names(p$x$layout))] <- NULL
p$x$layout[[p$x$layout$mapType]] <- modify_list(
list(domain = geoDomain), p$x$layout[[p$x$layout$mapType]]
)
} else if (!length(p$x$layout[["grid"]])) {
types <- vapply(p$x$data, function(tr) tr[["type"]] %||% "scatter", character(1))
axes <- unlist(lapply(types, function(x) {
grep("^[a-z]axis$", names(Schema$traces[[x]]$attributes), value = TRUE) %||% NULL
}))
for (axis in axes) {
p$x$layout[[axis]] <- modify_list(
list(domain = c(0, 1), automargin = TRUE), p$x$layout[[axis]]
)
}
}
p
}
supply_highlight_attrs <- function(p) {
# set "global" options via crosstalk variable
p$x$highlight <- p$x$highlight %||% highlight_defaults()
# defaults are now populated, allowing us to populate some other
# attributes such as the selectize widget definition
sets <- unlist(lapply(p$x$data, "[[", "set"))
keys <- setNames(lapply(p$x$data, "[[", "key"), sets)
p$x$highlight$ctGroups <- i(unique(sets))
# TODO: throw warning if we don't detect valid keys?
hasKeys <- FALSE
for (i in p$x$highlight$ctGroups) {
k <- unique(unlist(keys[names(keys) %in% i], use.names = FALSE))
if (is.null(k)) next
k <- k[!is.null(k)]
hasKeys <- TRUE
# include one selectize dropdown per "valid" SharedData layer
if (isTRUE(p$x$highlight$selectize)) {
p$x$selectize[[new_id()]] <- list(
items = data.frame(value = k, label = k), group = i
)
}
# set default values via crosstalk api
vals <- p$x$highlight$defaultValues[p$x$highlight$defaultValues %in% k]
if (length(vals)) {
p <- htmlwidgets::onRender(
p, sprintf(
"function(el, x) { crosstalk.group('%s').var('selection').set(%s) }",
i, jsonlite::toJSON(as.character(vals), auto_unbox = FALSE)
)
)
}
}
# add HTML dependencies, set a sensible dragmode default, & throw messages
if (hasKeys) {
p$x$layout$dragmode <- p$x$layout$dragmode %|D|%
default(switch(p$x$highlight$on %||% "", plotly_selected = "select") %||% "zoom")
if (is.default(p$x$highlight$off)) {
message(
sprintf(
"Setting the `off` event (i.e., '%s') to match the `on` event (i.e., '%s'). You can change this default via the `highlight()` function.",
p$x$highlight$off, p$x$highlight$on
)
)
}
}
p
}
# make sure plot attributes adhere to the plotly.js schema
verify_attr_names <- function(p) {
# some layout attributes (e.g., [x-y]axis can have trailing numbers)
attrs_name_check(
sub("[0-9]+$", "", names(p$x$layout)),
c(names(Schema$layout$layoutAttributes), c("barmode", "bargap", "mapType")),
"layout"
)
attrs_name_check(
names(p$x$config),
names(Schema$config),
"config"
)
for (tr in seq_along(p$x$data)) {
thisTrace <- p$x$data[[tr]]
attrSpec <- Schema$traces[[thisTrace$type %||% "scatter"]]$attributes
# make sure attribute names are valid
attrs_name_check(
names(thisTrace),
c(names(attrSpec), "key", "set", "frame", "transforms", "_isNestedKey", "_isSimpleKey", "_isGraticule", "_bbox"),
thisTrace$type
)
}
invisible(p)
}
# ensure both the layout and trace attributes adhere to the plot schema
verify_attr_spec <- function(p) {
if (!is.null(p$x$layout)) {
p$x$layout <- verify_attr(
p$x$layout, Schema$layout$layoutAttributes, layoutAttr = TRUE
)
}
for (tr in seq_along(p$x$data)) {
thisTrace <- p$x$data[[tr]]
validAttrs <- Schema$traces[[thisTrace$type %||% "scatter"]]$attributes
p$x$data[[tr]] <- verify_attr(thisTrace, validAttrs)
# prevent these objects from sending null keys
p$x$data[[tr]][["xaxis"]] <- p$x$data[[tr]][["xaxis"]] %||% NULL
p$x$data[[tr]][["yaxis"]] <- p$x$data[[tr]][["yaxis"]] %||% NULL
}
p
}
verify_attr <- function(proposed, schema, layoutAttr = FALSE) {
for (attr in names(proposed)) {
attrSchema <- schema[[attr]] %||% schema[[sub("[0-9]+$", "", attr)]]
# if schema is missing (i.e., this is an un-official attr), move along
if (is.null(attrSchema)) next
valType <- tryNULL(attrSchema[["valType"]]) %||% ""
role <- tryNULL(attrSchema[["role"]]) %||% ""
arrayOK <- tryNULL(attrSchema[["arrayOk"]]) %||% FALSE
isDataArray <- identical(valType, "data_array")
# where applicable, reduce single valued vectors to a constant
# (while preserving attributes)
if (!isDataArray && !arrayOK && !identical(role, "object")) {
proposed[[attr]] <- retain(proposed[[attr]], uniq)
}
# If we deliberately only want hover on fills, send a string to
# plotly.js so it does something sensible
if (identical(proposed[["hoveron"]], "fills")) {
proposed[["text"]] <- paste(uniq(proposed[["text"]]), collapse = "\n")
}
# ensure data_arrays of length 1 are boxed up by to_JSON()
if (isDataArray) {
proposed[[attr]] <- i(proposed[[attr]])
}
# tag 'src-able' attributes (needed for api_create())
# note that layout has 'src-able' attributes that shouldn't
# be turned into grids https://github.com/ropensci/plotly/pull/1489
isSrcAble <- !is.null(schema[[paste0(attr, "src")]]) && length(proposed[[attr]]) > 1
if ((isDataArray || isSrcAble) && !isTRUE(layoutAttr)) {
proposed[[attr]] <- structure(proposed[[attr]], apiSrc = TRUE)
}
if (length(proposed[["name"]]) > 0) {
proposed$name <- uniq(proposed$name)
}
# if marker.size was populated via `size` arg (i.e., internal map_size()),
# then it should _always_ be an array
# of appropriate length...
# (when marker.size is a constant, it always sets the diameter!)
# https://codepen.io/cpsievert/pen/zazXgw
# https://github.com/plotly/plotly.js/issues/2735
if (is.default(proposed$marker$size)) {
s <- proposed$marker[["size"]]
if (length(s) == 1) {
# marker.size could be of length 1, but we may have multiple
# markers -- in that case, if marker.size is an array
# of length 1 will result in just one marker
# https://codepen.io/cpsievert/pen/aMmOza
n <- length(proposed[["x"]] %||% proposed[["y"]] %||% proposed[["lat"]] %||% proposed[["lon"]])
proposed$marker[["size"]] <- default(i(rep(s, n)))
}
}
# do the same for "sub-attributes"
if (identical(role, "object") && is.recursive(proposed[[attr]])) {
proposed[[attr]] <- verify_attr(proposed[[attr]], schema[[attr]], layoutAttr = layoutAttr)
}
}
proposed
}
attrs_name_check <- function(proposedAttrs, validAttrs, type = "scatter") {
illegalAttrs <- setdiff(proposedAttrs, validAttrs)
if ("titlefont" %in% illegalAttrs) {
warning("The titlefont attribute is deprecated. Use title = list(font = ...) instead.", call. = FALSE)
illegalAttrs <- setdiff(illegalAttrs, "titlefont")
}
if (length(illegalAttrs)) {
warning("'", type, "' objects don't have these attributes: '",
paste(illegalAttrs, collapse = "', '"), "'\n",
"Valid attributes include:\n'",
paste(validAttrs, collapse = "', '"), "'\n",
call. = FALSE)
}
invisible(proposedAttrs)
}
# make sure trace type is valid
# TODO: add an argument to verify trace properties are valid (https://github.com/ropensci/plotly/issues/540)
verify_type <- function(trace) {
if (is.null(trace$type)) {
attrs <- names(trace)
attrLengths <- lengths(trace)
trace$type <- if (all(c("x", "y", "z") %in% attrs)) {
if (all(c("i", "j", "k") %in% attrs)) "mesh3d" else "scatter3d"
} else if (all(c("x", "y") %in% attrs)) {
xNumeric <- !is.discrete(trace[["x"]])
yNumeric <- !is.discrete(trace[["y"]])
if (xNumeric && yNumeric) {
if (any(attrLengths) > 15000) "scattergl" else "scatter"
} else if (xNumeric || yNumeric) {
"bar"
} else "histogram2d"
} else if ("y" %in% attrs || "x" %in% attrs) {
"histogram"
} else if ("z" %in% attrs) {
"heatmap"
} else {
warning("No trace type specified and no positional attributes specified",
call. = FALSE)
"scatter"
}
relay_type(trace$type)
}
if (!is.character(trace$type) || length(trace$type) != 1) {
stop("The trace type must be a character vector of length 1.\n",
call. = FALSE)
}
if (!trace$type %in% names(Schema$traces)) {
stop("Trace type must be one of the following: \n",
"'", paste(names(Schema$traces), collapse = "', '"), "'",
call. = FALSE)
}
# if scatter/scatter3d/scattergl, default to a scatterplot
if (grepl("scatter", trace$type) && is.null(trace$mode)) {
message(
"No ", trace$type, " mode specifed:\n",
" Setting the mode to markers\n",
" Read more about this attribute -> https://plot.ly/r/reference/#scatter-mode"
)
trace$mode <- "markers"
}
trace
}
relay_type <- function(type) {
message(
"No trace type specified:\n",
" Based on info supplied, a '", type, "' trace seems appropriate.\n",
" Read more about this trace type -> https://plot.ly/r/reference/#", type
)
type
}
# Searches a list for character strings and translates R linebreaks to HTML
# linebreaks (i.e., '\n' -> '<br />'). JavaScript function definitions created
# via `htmlwidgets::JS()` are ignored
translate_linebreaks <- function(p) {
recurse <- function(a) {
typ <- typeof(a)
if (typ == "list") {
# retain the class of list elements
# which important for many things, such as colorbars
a[] <- lapply(a, recurse)
} else if (typ == "character" && !inherits(a, "JS_EVAL")) {
attrs <- attributes(a)
a <- gsub("\n", br(), a, fixed = TRUE)
attributes(a) <- attrs
}
a
}
p$x[] <- lapply(p$x, recurse)
p
}
verify_orientation <- function(trace) {
xNumeric <- !is.discrete(trace[["x"]]) && !is.null(trace[["x"]] %||% NULL)
yNumeric <- !is.discrete(trace[["y"]]) && !is.null(trace[["y"]] %||% NULL)
if (xNumeric && !yNumeric) {
if (any(c("bar", "box") %in% trace[["type"]])) {
trace$orientation <- "h"
}
}
if (yNumeric && "histogram" %in% trace[["type"]]) {
trace$orientation <- "h"
}
trace
}
verify_mode <- function(p) {
for (tr in seq_along(p$x$data)) {
trace <- p$x$data[[tr]]
if (grepl("scatter", trace$type %||% "scatter")) {
if (user_specified(trace$marker) && !grepl("markers", trace$mode %||% "")) {
message(
"A marker object has been specified, but markers is not in the mode\n",
"Adding markers to the mode..."
)
p$x$data[[tr]]$mode <- paste0(p$x$data[[tr]]$mode, "+markers")
}
if (user_specified(trace$line) && !grepl("lines", trace$mode %||% "")) {
message(
"A line object has been specified, but lines is not in the mode\n",
"Adding lines to the mode..."
)
p$x$data[[tr]]$mode <- paste0(p$x$data[[tr]]$mode, "+lines")
}
if (user_specified(trace$textfont) && !grepl("text", trace$mode %||% "")) {
warning(
"A textfont object has been specified, but text is not in the mode\n",
"Adding text to the mode..."
)
p$x$data[[tr]]$mode <- paste0(p$x$data[[tr]]$mode, "+text")
}
}
}
p
}
verify_colorscale <- function(p) {
p$x$data <- lapply(p$x$data, function(trace) {
trace$colorscale <- colorscale_json(trace$colorscale)
trace$marker$colorscale <- colorscale_json(trace$marker$colorscale)
trace
})
p
}
# Coerce `x` into a data structure that can map to a colorscale attribute.
# Note that colorscales can either be the name of a scale (e.g., 'Rainbow') or
# a 2D array (e.g., [[0, 'rgb(0,0,255)'], [1, 'rgb(255,0,0)']])
colorscale_json <- function(x) {
if (!length(x)) return(x)
if (is.character(x)) return(x)
if (is.matrix(x)) {
if (ncol(x) != 2) stop("A colorscale matrix requires two columns")
x <- as.data.frame(x)
x[, 1] <- as.numeric(x[, 1])
}
# ensure a list like this: list(list(0, 0.5, 1), list("red", "white", "blue"))
# converts to the correct dimensions: [[0, 'red'], [0.5, 'white'], [1, 'blue']]
if (is.list(x) && length(x) == 2) {
n1 <- length(x[[1]])
n2 <- length(x[[2]])
if (n1 != n2 || n1 == 0 || n2 == 0) {
warning("A colorscale list must of elements of the same (non-zero) length")
} else if (!is.data.frame(x) && can_be_numeric(x[[1]])) {
x <- data.frame(
val = as.numeric(x[[1]]),
col = as.character(x[[2]]),
stringsAsFactors = FALSE
)
x <- setNames(x, NULL)
}
}
x
}
can_be_numeric <- function(x) {
xnum <- suppressWarnings(as.numeric(x))
sum(is.na(x)) == sum(is.na(xnum))
}
# if an object (e.g. trace.marker) contains a non-default attribute, it has been user-specified
user_specified <- function(obj = NULL) {
if (!length(obj)) return(FALSE)
!all(rapply(obj, is.default))
}
# populate categorical axes using categoryorder="array" & categoryarray=[]
populate_categorical_axes <- function(p) {
axes <- p$x$layout[grepl("^xaxis|^yaxis", names(p$x$layout))] %||%
list(xaxis = NULL, yaxis = NULL)
for (i in seq_along(axes)) {
axis <- axes[[i]]
axisName <- names(axes)[[i]]
axisType <- substr(axisName, 0, 1)
# ggplotly() populates these attributes...don't want to clobber that
if (!is.null(axis$ticktext) || !is.null(axis$tickvals)) next
# collect all the data that goes on this axis
d <- lapply(p$x$data, "[[", axisType)
isOnThisAxis <- function(tr) {
is.null(tr[["geo"]]) && sub("axis", "", axisName) %in%
(tr[[sub("[0-9]+", "", axisName)]] %||% axisType) &&
# avoid reordering matrices (see #863)
!is.matrix(tr[["z"]])
}
d <- d[vapply(p$x$data, isOnThisAxis, logical(1))]
if (length(d) == 0) next
isDiscrete <- vapply(d, is.discrete, logical(1))
if (0 < sum(isDiscrete) & sum(isDiscrete) < length(d)) {
warning(
"Can't display both discrete & non-discrete data on same axis",
call. = FALSE
)
next
}
if (sum(isDiscrete) == 0) next
categories <- lapply(d, getLevels)
categories <- unique(unlist(categories))
if (any(!vapply(d, is.factor, logical(1)))) categories <- sort(categories)
p$x$layout[[axisName]]$type <-
p$x$layout[[axisName]]$type %||% "category"
p$x$layout[[axisName]]$categoryorder <-
p$x$layout[[axisName]]$categoryorder %||% "array"
p$x$layout[[axisName]]$categoryarray <-
p$x$layout[[axisName]]$categoryarray %||% categories
}
p
}
verify_arrays <- function(p) {
for (i in c("annotations", "shapes", "images")) {
thing <- p$x$layout[[i]]
if (is.list(thing) && !is.null(names(thing))) {
p$x$layout[[i]] <- list(thing)
}
}
p
}
verify_hovermode <- function(p) {
if (!is.null(p$x$layout$hovermode)) {
return(p)
}
types <- unlist(lapply(p$x$data, function(tr) tr$type %||% "scatter"))
modes <- unlist(lapply(p$x$data, function(tr) tr$mode %||% "lines"))
if (any(grepl("markers", modes) & types == "scatter") ||
any(c("plotly_hover", "plotly_click") %in% p$x$highlight$on)) {
p$x$layout$hovermode <- "closest"
}
p
}
verify_key_type <- function(p) {
keys <- lapply(p$x$data, "[[", "key")
for (i in seq_along(keys)) {
k <- keys[[i]]
if (is.null(k)) next
if ("select" %in% p$x$layout$clickmode && "plotly_click" %in% p$x$highlight$on) {
warning(
"`layout.clickmode` = 'select' is not designed to work well with ",
"the R package's linking framework (i.e. crosstalk support).",
call. = FALSE
)
}
# does it *ever* make sense to have a missing key value?
uk <- uniq(k)
if (length(uk) == 1) {
# i.e., the key for this trace has one value. In this case,
# we don't have iterate through the entire key, so instead,
# we provide a flag to inform client side logic to match the _entire_
# trace if this one key value is a match
p$x$data[[i]]$key <- uk[[1]]
p$x$data[[i]]$`_isSimpleKey` <- TRUE
p$x$data[[i]]$`_isNestedKey` <- FALSE
}
p$x$data[[i]]$`_isNestedKey` <- p$x$data[[i]]$`_isNestedKey` %||% !lazyeval::is_atomic(k)
# key values should always be strings
if (p$x$data[[i]]$`_isNestedKey`) {
p$x$data[[i]]$key <- lapply(p$x$data[[i]]$key, function(x) I(as.character(x)))
p$x$data[[i]]$key <- setNames(p$x$data[[i]]$key, NULL)
} else {
p$x$data[[i]]$key <- I(as.character(p$x$data[[i]]$key))
}
}
p
}
verify_webgl <- function(p) {
# see toWebGL
if (!isTRUE(p$x$.plotlyWebGl)) {
return(p)
}
types <- sapply(p$x$data, function(x) x[["type"]][1] %||% "scatter")
can_gl <- paste0(types, "gl") %in% names(Schema$traces)
already_gl <- grepl("gl$", types)
if (any(!can_gl & !already_gl)) {
warning(
"The following traces don't have a WebGL equivalent: ",
paste(which(!can_gl & !already_gl), collapse = ", ")
)
}
for (i in which(can_gl)) {
p$x$data[[i]]$type <- paste0(p$x$data[[i]]$type, "gl")
}
p
}
verify_showlegend <- function(p) {
# this attribute should be set in hide_legend()
# it ensures that "legend titles" go away in addition to showlegend = FALSE
if (isTRUE(p$x$.hideLegend)) {
ann <- p$x$layout$annotations
is_title <- vapply(ann, function(x) isTRUE(x$legendTitle), logical(1))
p$x$layout$annotations <- ann[!is_title]
p$x$layout$showlegend <- FALSE
}
show <- vapply(p$x$data, function(x) x$showlegend %||% TRUE, logical(1))
# respect only _user-specified_ defaults
isSinglePie <- identical("pie", unlist(lapply(p$x$data, function(tr) tr$type)))
p$x$layout$showlegend <- p$x$layout$showlegend %|D|%
default(sum(show) > 1 || isTRUE(p$x$highlight$showInLegend) || isSinglePie)
p
}
verify_guides <- function(p) {
# since colorbars are implemented as "invisible" traces, prevent a "trivial" legend
if (has_colorbar(p) && has_legend(p) && length(p$x$data) <= 2) {
p$x$layout$showlegend <- default(FALSE)
}
isVisibleBar <- function(tr) {
is.colorbar(tr) && (tr$showscale %||% TRUE)
}
isBar <- vapply(p$x$data, isVisibleBar, logical(1))
nGuides <- sum(isBar) + has_legend(p)
if (nGuides > 1) {
# place legend at bottom since its scrolly
yanchor <- default("top")
y <- default(1 - ((nGuides - 1) / nGuides))
p$x$layout$legend$yanchor <- p$x$layout$legend$yanchor %|D|% yanchor
p$x$layout$legend$y <- p$x$layout$legend[["y"]] %|D|% y
# shrink/position colorbars
idx <- which(isBar)
for (i in seq_along(idx)) {
len <- default(1 / nGuides)
lenmode <- default("fraction")
y <- default(1 - ((i - 1) / nGuides))
j <- idx[[i]]
tr <- p$x$data[[j]]
if (inherits(tr, "zcolor")) {
p$x$data[[j]]$colorbar$len <- tr$colorbar$len %|D|% len
p$x$data[[j]]$colorbar$lenmode <- tr$colorbar$lenmode %|D|% lenmode
p$x$data[[j]]$colorbar$y <- tr$colorbar$y %|D|% y
p$x$data[[j]]$colorbar$yanchor <- tr$colorbar$yanchor %|D|% yanchor
} else {
p$x$data[[j]]$marker$colorbar$len <- tr$marker$colorbar$len %|D|% len
p$x$data[[j]]$marker$colorbar$lenmode <- tr$marker$colorbar$lenmode %|D|% lenmode
p$x$data[[j]]$marker$colorbar$y <- tr$marker$colorbar$y %|D|% y
p$x$data[[j]]$marker$colorbar$yanchor <- tr$marker$colorbar$yanchor %|D|% yanchor
}
}
}
p
}
verify_mathjax <- function(p) {
hasMathjax <- "mathjax" %in% sapply(p$dependencies, "[[", "name")
if (hasMathjax) return(p)
hasTeX <- any(rapply(p$x, is.TeX))
if (!hasTeX) return(p)
# TODO: it would be much better to add the dependency here, but
# htmlwidgets doesn't currently support adding dependencies at print-time!
warning(
"Detected the use of `TeX()`, but mathjax has not been specified. ",
"Try running `config(.Last.value, mathjax = 'cdn')`",
call. = FALSE
)
p
}
verify_scattergl_platform <- function(p) {
if (!identical(.Platform$OS.type, "windows")) return(p)
if (!is_rstudio()) return(p)
types <- vapply(p$x$data, function(x) x[["type"]] %||% "scatter", character(1))
if ("scattergl" %in% types) {
warning(
"'scattergl' trace types don't currently render in RStudio on Windows. ",
"Open in another web browser (IE, Chrome, Firefox, etc).",
call. = FALSE
)
}
p
}
has_marker <- function(types, modes) {
is_scatter <- grepl("scatter", types)
ifelse(is_scatter, grepl("marker", modes), has_attr(types, "marker"))
}
has_line <- function(types, modes) {
is_scatter <- grepl("scatter", types)
ifelse(is_scatter, grepl("line", modes), has_attr(types, "line"))
}
has_text <- function(types, modes) {
is_scatter <- grepl("scatter", types)
ifelse(is_scatter, grepl("text", modes), has_attr(types, "textfont"))
}
has_color_array <- function(types, mode = "marker") {
vapply(types, function(x) isTRUE(tryNULL(Schema$traces[[x]]$attributes[[mode]]$color$arrayOk)), logical(1))
}
has_attr <- function(types, attr = "marker") {
if (length(attr) != 1) stop("attr must be of length 1")
vapply(types, function(x) attr %in% names(Schema$traces[[x]]$attributes), logical(1))
}
has_legend <- function(p) {
showLegend <- function(tr) {
tr$showlegend %||% TRUE
}
any(vapply(p$x$data, showLegend, logical(1))) &&
isTRUE(p$x$layout$showlegend %|D|% TRUE)
}
has_colorbar <- function(p) {
isVisibleBar <- function(tr) {
is.colorbar(tr) && isTRUE(tr$showscale %||% TRUE)
}
any(vapply(p$x$data, isVisibleBar, logical(1)))
}
# is a given trace type 3d?
is3d <- function(type = NULL) {
type <- type %||% "scatter"
type %in% c("mesh3d", "scatter3d", "surface")
}
# Check for credentials/configuration and throw warnings where appropriate
verify <- function(what = "username", warn = TRUE) {
val <- grab(what)
if (val == "" && warn) {
switch(what,
username = warning("You need a plotly username. See help(signup, package = 'plotly')", call. = FALSE),
api_key = warning("You need an api_key. See help(signup, package = 'plotly')", call. = FALSE))
warning("Couldn't find ", what, call. = FALSE)
}
as.character(val)
}
# Check whether a certain credential/configuration exists.
grab <- function(what = "username") {
who <- paste0("plotly_", what)
val <- Sys.getenv(who, "")
# If the environment variable doesn't exist, try reading hidden files that may
# have been created using other languages or earlier versions of this package