add_features_to_draw: Add features to an existing draw control

In mapgl: Interactive Maps with 'Mapbox GL JS' and 'MapLibre GL JS'

Add features to an existing draw control

Description

This function adds features from an existing source to a draw control on a map.

Usage

add_features_to_draw(map, source, clear_existing = FALSE)

Arguments

map	A map object with a draw control already added
source	Character string specifying a source ID to get features from
clear_existing	Logical, whether to clear existing drawn features before adding new ones. Default is FALSE.

Value

The modified map object

Examples

## Not run: 
library(mapgl)
library(tigris)

# Add features from an existing source
tx <- counties(state = "TX", cb = TRUE)
mapboxgl(bounds = tx) |>
  add_source(id = "tx", data = tx) |>
  add_draw_control() |>
  add_features_to_draw(source = "tx")

# In a Shiny app
observeEvent(input$load_data, {
  mapboxgl_proxy("map") |>
    add_features_to_draw(
      source = "dynamic_data",
      clear_existing = TRUE
    )
})

## End(Not run)

mapgl documentation built on June 16, 2025, 5:09 p.m.