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#' Adding FusionCharts caption
#'
#' \url{https://www.fusioncharts.com/dev/chart-guide/chart-configurations/caption-and-sub-caption}
#'
#' @import htmlwidgets
#'
#' @param fusionPlot fusionPlot object got by \code{fusionPlot()}
#' @param caption Specify the caption of the chart
#' @param captionFont Set the caption font family
#' @param captionFontSize Set the caption font size (between 0 and 72)
#' @param captionFontColor Set the caption font color
#' @param captionFontBold Enable caption font to bold
#' @param captionOnTop Display the caption at the top of the chart
#' @param captionAlignment Specify the horizontal alignment of the caption
#'
#' @examples
#' library(fusionchartsR)
#'
#' df <- data.frame(label = c("Venezuela", "Saudi", "Canada", "Russia"), value = c(290, 260,180, 115))
#' fusionPlot(data = df, x = "label", y = "value", type = "column2d") %>%
#' fusionCaption(caption = "Caption on the left", captionAlignment = "left") %>%
#' fusionSubcaption(subcaption = "subcaption too") %>%
#' fusionTheme(theme = "fusion")
#'
#' @export
fusionCaption <- function(fusionPlot, caption = "Add a caption here", captionFont = "Arial",
captionFontSize = "18", captionFontColor = "#5A5A5A", captionFontBold = TRUE, captionOnTop = TRUE,
captionAlignment = c("center", "left", "right")) {
CaptionAttrs <- list()
CaptionAttrs$caption <- caption
CaptionAttrs$captionFont <- captionFont
CaptionAttrs$captionFontSize <- captionFontSize
CaptionAttrs$captionFontColor <- captionFontColor
CaptionAttrs$captionFontBold <- as.numeric(captionFontBold)
CaptionAttrs$captionAlignment <- match.arg(captionAlignment)
CaptionAttrs$captionOnTop <- as.numeric(captionOnTop)
fusionPlot$x$caption <- CaptionAttrs$caption
fusionPlot$x$captionFont <- CaptionAttrs$captionFont
fusionPlot$x$captionFontSize <- CaptionAttrs$captionFontSize
fusionPlot$x$captionFontColor <- CaptionAttrs$captionFontColor
fusionPlot$x$captionFontBold <- CaptionAttrs$captionFontBold
fusionPlot$x$captionAlignment <- CaptionAttrs$captionAlignment
fusionPlot$x$captionOnTop <- CaptionAttrs$captionOnTop
return(fusionPlot)
}
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