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# import specific functions from relevant libraries
box::use(leaflet[
leaflet,
providers,
addTiles,
addProviderTiles,
addPolygons,
addLegend,
addControl,
setView,
addCircleMarkers,
colorBin,
colorNumeric,
markerClusterOptions,
labelOptions
])
box::use(leaflet.extras[
addFullscreenControl,
addSearchFeatures,
searchFeaturesOptions
])
box::use(dplyr[filter])
box::use(viridis)
#* @param df data frame containing map coordinates
#* @param vernacular the vernacular names of the animals
#* @param locality regions in Poland
# write map function
mapData <- function(df, vernacular) {
# set default values if arguments are NULL or empty
if (is.null(vernacular)) {
vernacular <- "Mandarin Duck"
} else {
vernacular
}
# filter the data based on vernacular and locality
filtered_df <- df |>
filter(vernacularName == vernacular)
# ensure there is data to display
if (nrow(filtered_df) == 0) {
leaflet() |>
addTiles() |>
addPopups(lng = 0, lat = 0, popup = "No data available for the selected filters")
}
# create a color palette for markers
pal <- colorNumeric(palette = "Paired", domain = filtered_df$individualCount)
# create the tooltip labels
labels <- paste0(
"<b>Vernacular Name: </b>", filtered_df$vernacularName, "<br>",
"<b>Individual Count: </b>", filtered_df$individualCount, "<br>",
"<b>Locality: </b>", filtered_df$locality
) |> lapply(htmltools::HTML)
# create the map
leaflet(filtered_df) |>
addTiles() |>
addProviderTiles(providers$CartoDB.Positron) |>
addCircleMarkers(
lng = ~longitudeDecimal,
lat = ~latitudeDecimal,
color = ~ pal(individualCount),
fillColor = ~ pal(individualCount),
fillOpacity = 0.7,
label = labels,
labelOptions = labelOptions(
style = list("font-weight" = "normal", padding = "3px 8px"),
textsize = "15px",
direction = "auto"
)
) |>
addLegend(
pal = pal,
values = ~individualCount,
title = "Individual Count",
position = "bottomright"
)
}
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