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#' CSS for dygraph labels and legend
#'
#' Apply custom CSS to the text drawn within a dygraph. See the
#' \href{http://dygraphs.com/css.html}{CSS documentation} on the dygraphs
#' website for additional details on which styles are available.
#'
#' @param dygraph Dygraph to add CSS styles to
#' @param css Path to css file to be used for styling textual elements of the
#' graph.
#'
#' @return dygraph with additional CSS styles
#'
#' @note See the
#' \href{https://rstudio.github.io/dygraphs/gallery-css-styling.html}{CSS
#' Styling} article on the dygraphs for R website for additional details.
#'
#' Note that CSS styles are global so will affect all dygraphs on a given web
#' page. This also implies that for a page with multiple plots you only need
#' to specify styles for the first one (alternatively you can just add them
#' directly to the page by other means).
#'
#' @export
dyCSS <- function(dygraph, css) {
# read css
dygraph$x$css <- paste(readLines(css, warn = FALSE), collapse = "\n")
# return modified dygraph
dygraph
}
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