Nothing
library(shiny)
library(leaflet)
library(leaflet.extras2)
dlat <- 1 / 111000 * 100 # degrees per metre
ui <- fluidRow(
tags$h2("Using Leaflet.Spin in Shiny"),
actionButton("plotbutton", label = "Show Spinner While Adding Markers"),
leafletOutput("map")
)
server <- function(input, output, session) {
output$map <- renderLeaflet({
leaflet() %>%
addTiles() %>%
setView(175.322, -37.789, zoom = 17) %>%
addSpinner()
})
observeEvent(input$plotbutton, {
n <- ceiling(runif(1) * 10000)
leafletProxy("map") %>%
startSpinner(list("lines" = 7, "length" = 40,
"width" = 20, "radius" = 10)) %>%
clearShapes() %>%
addCircles(
lng = 175.322 + (runif(n) * 2 - 1) * dlat * 6,
lat = -37.789 + (runif(n) * 2 - 1) * dlat * 1.5,
radius = dlat * runif(n) * dlat
) %>%
stopSpinner()
})
}
shinyApp(ui = ui, server = server)
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