inst/examples/shiny-click/app.R

In dreamRs/topogRam: Create Interactive Continuous Cartogram

#  ------------------------------------------------------------------------
#
# Title : topogram - proxy : update value
#    By : Victor
#  Date : 2018-10-01
#
#  ------------------------------------------------------------------------




# Packages ----------------------------------------------------------------

library( shiny )
library( rnaturalearth )
library( topogram )
library( dplyr )




# Data --------------------------------------------------------------------

# population data
data("pop_france")


# map data
fr_dept <- ne_states(country = "france", returnclass = "sf")
fr_dept <- fr_dept[fr_dept$type_en %in% "Metropolitan department", ]



# join data
fr_data <- left_join(
  x = fr_dept %>% select(name, iso_3166_2) %>% mutate(code_dep = gsub("FR-", "", iso_3166_2)),
  y = pop_france,
  by = c("code_dep" = "departements_code")
)





# App ---------------------------------------------------------------------


library(shiny)

ui <- fluidPage(
  fluidRow(
    column(
      width = 10, offset = 1,
      tags$h2("topogram : retrieve data by clicking"),
      topogramOutput(outputId = "carto", height = "600px"),
      verbatimTextOutput(outputId = "click")
    )
  )
)

server <- function(input, output, session) {

  # Initialize
  output$carto <- renderTopogram({
    topogram(
      shape = fr_data,
      value = "femmes_0_a_19_ans",
      tooltip_label = ~name,
      n_iteration = 10
      # , layerId = ~name # use this to only return "name" otherwise all are returned
    )
  })

  # retrieve value clicked
  output$click <- renderPrint({
    input$carto_click
  })

}

shinyApp(ui, server)