#' Vega-lite in R
#'
#' Plot data with vega-lite from R with the convenience of
#' htmlwidgets infrastructure.
#'
#' @example inst/examples/examples.R
#' @import htmlwidgets
#'
#' @export
vegalite <- function(spec, renderer = "svg", width = NULL, height = NULL) {
# forward options using x
x = list(
spec = spec,
renderer = renderer
)
# create widget
htmlwidgets::createWidget(
name = 'vegalite',
x,
width = width,
height = height,
package = 'vegaliteR'
)
}
#' Shiny bindings for vegalite
#'
#' Output and render functions for using vegalite within Shiny
#' applications and interactive Rmd documents.
#'
#' @param outputId output variable to read from
#' @param width,height Must be a valid CSS unit (like \code{'100\%'},
#' \code{'400px'}, \code{'auto'}) or a number, which will be coerced to a
#' string and have \code{'px'} appended.
#' @param expr An expression that generates a vegalite
#' @param env The environment in which to evaluate \code{expr}.
#' @param quoted Is \code{expr} a quoted expression (with \code{quote()})? This
#' is useful if you want to save an expression in a variable.
#'
#' @name vegalite-shiny
#'
#' @export
vegaliteOutput <- function(outputId, width = '100%', height = '400px'){
htmlwidgets::shinyWidgetOutput(outputId, 'vegalite', width, height, package = 'vegaliteR')
}
#' @rdname vegalite-shiny
#' @export
renderVegalite <- function(expr, env = parent.frame(), quoted = FALSE) {
if (!quoted) { expr <- substitute(expr) } # force quoted
htmlwidgets::shinyRenderWidget(expr, vegaliteOutput, env, quoted = TRUE)
}
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