320 lines
8.8 KiB
R
320 lines
8.8 KiB
R
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#' @importFrom rlang eval_tidy
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get_facets <- function(data, vars) {
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byvars <- lapply(X = vars, FUN = eval_tidy, data = data)
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facets <- split(x = data, f = byvars, sep = "|__|")
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lapply(
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X = seq_along(facets),
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FUN = function(i) {
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facet <- facets[[i]]
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attr(facet, "keys") <- strsplit(
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x = names(facets)[i],
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split = "|__|", fixed = TRUE
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)[[1]]
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facet
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}
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)
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}
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set_scale <- function(ax, values, scales = c("fixed", "free", "free_y", "free_x"), axis = c("x", "y")) {
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if (is.null(scales))
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return(ax)
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scales <- match.arg(scales)
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axis <- match.arg(axis)
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if (is.null(values))
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return(ax)
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if (inherits(values, c("numeric", "integer", "Date", "POSIXt"))) {
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range_vals <- range(pretty(values), na.rm = TRUE)
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} else {
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range_vals <- NULL
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}
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fmt <- function(x, time = inherits(values, c("Date", "POSIXt"))) {
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if (is.null(x))
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return(NULL)
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if (time)
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x <- format_date(x)
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x
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}
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fun_axis <- switch(
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axis,
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"x" = ax_xaxis,
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"y" = ax_yaxis
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)
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if (scales == "fixed") {
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ax <- fun_axis(
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ax = ax,
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min = fmt(range_vals[1]),
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max = fmt(range_vals[2])
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)
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} else if (scales == "free") {
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ax <- fun_axis(
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ax = ax,
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min = character(0),
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max = character(0)
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)
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} else {
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ax <- fun_axis(
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ax = ax,
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min = fmt(range_vals[1]),
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max = fmt(range_vals[2])
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)
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if (scales == "free_x" & axis == "x") {
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ax <- fun_axis(
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ax = ax,
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min = character(0),
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max = character(0)
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)
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}
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if (scales == "free_y" & axis == "y") {
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ax <- fun_axis(
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ax = ax,
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min = character(0),
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max = character(0)
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)
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}
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}
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return(ax)
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}
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#' @importFrom rlang eval_tidy is_null is_function
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build_facets <- function(chart) {
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data <- chart$x$data
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mapall <- lapply(chart$x$mapping, eval_tidy, data = data)
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labeller <- chart$x$facet$labeller
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facets_data <- get_facets(data, chart$x$facet$facets)
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nums <- seq_along(facets_data)
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dims <- get_grid_dims(nums, nrow = chart$x$facet$nrow, ncol = chart$x$facet$ncol)
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grid <- matrix(
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data = c(
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nums,
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rep(NA, times = (dims$nrow * dims$ncol) - length(nums))
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),
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nrow = dims$nrow,
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ncol = dims$ncol,
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byrow = TRUE
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)
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lrow <- get_last_row(grid)
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lapply(
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X = nums,
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FUN = function(i) {
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new <- chart
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facet <- facets_data[[i]]
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if (!is_null(labeller) && is_function(labeller)) {
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keys <- attr(facet, "keys")
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text <- labeller(keys)
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new <- ax_title(new, text = text, margin = 0, floating = length(text) <= 1)
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}
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mapdata <- lapply(chart$x$mapping, eval_tidy, data = facet)
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if (chart$x$facet$scales %in% c("fixed", "free_y") & chart$x$type %in% c("bar")) {
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mapdata <- complete_mapdata(mapdata, mapall)
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}
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if (chart$x$facet$scales %in% c("fixed", "free_x") & chart$x$type %in% c("column")) {
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mapdata <- complete_mapdata(mapdata, mapall)
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}
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new$x$ax_opts$series <- make_series(mapdata, chart$x$mapping, chart$x$type, chart$x$serie_name)
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new <- set_scale(new, mapall$x, scales = chart$x$facet$scales, axis = "x")
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new <- set_scale(new, mapall$y, scales = chart$x$facet$scales, axis = "y")
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if (chart$x$facet$scales %in% c("fixed", "free_x")) {
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new <- ax_yaxis(new, show = i %in% grid[, 1])
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}
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# if (chart$x$facet$scales %in% c("fixed", "free_y")) {
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# new <- ax_xaxis(new, labels = list(show = i %in% lrow), axisTicks = list(show = TRUE))
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# }
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if (chart$x$facet$scales %in% c("fixed", "free_y") & chart$x$type %in% c("bar", "column")) {
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new <- ax_xaxis(new, labels = list(show = i %in% lrow))
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}
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if (!is.null(new$x$colors_manual)) {
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new <- ax_colors_manual(ax = new, values = new$x$colors_manual)
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}
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new$height <- chart$x$facet$chart_height
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new$x$facet <- NULL
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class(new) <- setdiff(class(new), "apex_facet")
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return(new)
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}
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)
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}
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get_last_row <- function(mat) {
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apply(X = mat, MARGIN = 2, FUN = function(x) {
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x <- x[!is.na(x)]
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x[length(x)]
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})
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}
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#' Facet wrap for ApexCharts
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#'
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#' @param ax An \code{apexcharts} \code{htmlwidget} object.
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#' @param facets Variable(s) to use for facetting, wrapped in \code{vars(...)}.
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#' @param nrow,ncol Number of row and column in output matrix.
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#' @param scales Should scales be fixed (\code{"fixed"}, the default),
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#' free (\code{"free"}), or free in one dimension (\code{"free_x"}, \code{"free_y"})?
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#' @param labeller A function with one argument containing for each facet the value of the faceting variable.
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#' @param chart_height Individual chart height.
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#'
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#' @return An \code{apexcharts} \code{htmlwidget} object.
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#' @export
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#'
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#' @importFrom rlang quos syms
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#'
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#' @example examples/facet_wrap.R
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ax_facet_wrap <- function(ax,
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facets,
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nrow = NULL,
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ncol = NULL,
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scales = c("fixed", "free", "free_y", "free_x"),
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labeller = label_value,
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chart_height = "300px") {
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if (!inherits(ax, "apex"))
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stop("ax_facet_wrap only works with charts generated with apex()", call. = FALSE)
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scales <- match.arg(scales)
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if (is.character(facets))
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facets <- quos(!!!syms(facets))
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ax$x$facet <- list(
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facets = facets,
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nrow = nrow,
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ncol = ncol,
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scales = scales,
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labeller = labeller,
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chart_height = chart_height
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)
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class(ax) <- c("apex_facet", class(ax))
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return(ax)
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}
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# Shiny -------------------------------------------------------------------
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#' @title Shiny bindings for faceting with apexcharter
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#'
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#' @description Output and render functions for using apexcharter faceting within Shiny
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#' applications and interactive Rmd documents.
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#'
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#' @param outputId output variable to read from
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#'
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#' @return An Apexcharts output that can be included in the application UI.
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#' @export
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#'
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#' @name apexcharter-shiny-facets
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#'
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#' @importFrom htmltools tagList
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#' @importFrom shiny uiOutput
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#' @importFrom htmlwidgets getDependency
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#'
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#' @example examples/facet-shiny.R
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apexfacetOutput <- function(outputId) {
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tagList(
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uiOutput(outputId = outputId),
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getDependency(name = "apexcharter", package = "apexcharter")
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)
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}
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#' @param expr An expression that generates a apexcharter facet.
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#' @param env The environment in which to evaluate \code{expr}.
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#' @param quoted Is \code{expr} a quoted expression (with \code{quote()})? This
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#' is useful if you want to save an expression in a variable.
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#'
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#' @export
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#'
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#' @rdname apexcharter-shiny-facets
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#'
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#' @importFrom shiny exprToFunction createRenderFunction createWebDependency
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#' @importFrom htmltools renderTags resolveDependencies
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renderApexfacet <- function(expr, env = parent.frame(), quoted = FALSE) {
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func <- exprToFunction(expr, env, quoted)
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createRenderFunction(
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func = func,
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transform = function(result, shinysession, name, ...) {
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if (is.null(result) || length(result) == 0)
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return(NULL)
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if (!inherits(result, "apex_facet")) {
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stop(
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"renderApexfacet: 'expr' must return an apexcharter facet object.",
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call. = FALSE
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)
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}
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facets_charts <- build_facets(result)
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TAG <- build_grid(
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content = facets_charts,
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nrow = result$x$facet$nrow,
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ncol = result$x$facet$ncol
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)
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rendered <- renderTags(TAG)
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deps <- lapply(
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X = resolveDependencies(rendered$dependencies),
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FUN = createWebDependency
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)
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list(
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html = rendered$html,
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deps = deps
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)
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}, apexfacetOutput, list()
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)
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}
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# Print methods -----------------------------------------------------------
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#' @export
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print.apex_facet <- function(x, ...) {
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facets_charts <- build_facets(x)
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TAG <- build_grid(facets_charts, nrow = x$x$facet$nrow, ncol = x$x$facet$ncol)
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print(htmltools::browsable(TAG))
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}
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knit_print.apex_facet <- function(x, ..., options = NULL) {
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facets_charts <- build_facets(x)
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TAG <- build_grid(facets_charts, nrow = x$x$facet$nrow, ncol = x$x$facet$ncol)
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knitr::knit_print(htmltools::browsable(TAG), options = options, ...)
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}
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# Complete ----------------------------------------------------------------
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complete_mapdata <- function(mapdata, mapall) {
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data <- as.data.frame(mapdata)
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full_data <- data.frame(x = unique(mapall$x), stringsAsFactors = FALSE)
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full_data <- merge(
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x = full_data,
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y = data,
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by = "x",
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all.x = TRUE,
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sort = TRUE
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)
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full_data$y[is.na(full_data$y)] <- 0
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return(as.list(full_data))
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}
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complete_data <- function(data, vars, fill_var, fill_value = 0) {
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full_data <- expand.grid(lapply(
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X = data[, vars],
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FUN = unique
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))
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full_data <- merge(
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x = full_data,
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y = data,
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by = vars,
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all.x = TRUE,
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sort = FALSE
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)
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full_data[[fill_var]][is.na(full_data[[fill_var]])] <- fill_value
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return(full_data)
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}
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