R/leafletDragPoints.R

In antaresViz: Antares Visualizations

checkSlotId <- function(data){
  if("SpatialPolygonsDataFrame" %in% class(data)){
    data <- sp::spChFIDs(data, as.character(1:nrow(data@data)))
  }
  data
}

#' @noRd
leafletDragPoints <- function(geopoints, map = NULL, width = NULL, height = NULL,
                              init = FALSE, reset_map = FALSE, draggable = TRUE) {
  
  if (!is.null(map)){
    map <- checkSlotId(map)
    
    if("geoAreaId" %in% names(map)){
      map <- geojsonio::geojson_json(map[!duplicated(map$"geoAreaId"), ])
      # } else if("code" %in% names(map)){
      #   map <- geojsonio::geojson_json(map[!duplicated(map$"code"), ])
      # 
    } else {
      map <- geojsonio::geojson_json(map)
    }
  }
  
  if(!is.null(geopoints)){
    geopoints$avg <- (geopoints$lat + geopoints$lon) / 2
    
    firstPoint <- which.min(geopoints$avg)
    secondPoint <- which.max(geopoints$avg)
  }
  
  x = list(geopoints = geopoints, map = map, init = init, reset_map = reset_map, draggable = draggable)
  
  attr(x, 'TOJSON_ARGS') <- list(dataframe = "rows")
  
  # get leaflet dependencies
  list_dep <- list()
  
  leaflet_dependency <- htmlwidgets::getDependency("leaflet")
  names_leaflet_dependency <- sapply(leaflet_dependency, function(x) x$name)
  ind_leaflet <- which(names_leaflet_dependency %in% "leaflet")
  list_dep[[1]] <- leaflet_dependency[[ind_leaflet[1]]]
  
  list_dep[[2]] <- htmltools::htmlDependency(
    name = "Leaflet.AwesomeMarkers",
    version = "2.0.1",
    src = c(file=system.file("htmlwidgets/lib/Leaflet.awesome-markers", package="antaresViz")),
    script  = "leaflet.awesome-markers.min.js",
    stylesheet = "leaflet.awesome-markers.css"
  )
  
  # create widget
  htmlwidgets::createWidget(
    name = 'leafletDragPoints',
    x,
    width = width,
    height = height,
    package = 'antaresViz',
    sizingPolicy = htmlwidgets::sizingPolicy(
      browser.fill = TRUE
    ),
    dependencies = list_dep
  )
}

#' Shiny bindings for placeGeoPoints
#'
#' Output and render functions for using placeGeoPoints 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 placeGeoPoints
#' @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 placeGeoPoints-shiny
#'
#' @export
leafletDragPointsOutput <- function(outputId, width = '100%', height = '400px'){
  htmlwidgets::shinyWidgetOutput(outputId, 'leafletDragPoints', width, height, package = 'antaresViz')
}

#' @rdname placeGeoPoints-shiny
#' @export
renderLeafletDragPoints <- function(expr, env = parent.frame(), quoted = FALSE) {
  if (!quoted) { expr <- substitute(expr) } # force quoted
  htmlwidgets::shinyRenderWidget(expr, leafletDragPointsOutput, env, quoted = TRUE)
}