tilemap_get_tileset

Using this function you can retrieve the index value of the Tile Set asset assigned to a given tile map element on a layer.

You give the Tile Map element ID (which you get when you create a tile map element using layer_tilemap_create() or when you use the function layer_tilemap_get_id()), and the function will return the Tile Set asset index.

Syntax:

tilemap_get_tileset(tilemap_element_id)

Returns:

Tile Set Asset

Example:

var lay_id = layer_get_id("Tiles_trees");
var map_id = layer_tilemap_get_id(lay_id);
if (tilemap_get_tileset(map_id) != ts_Nighttime)
{
    tilemap_tileset(map_id, ts_Nighttime);
}

The above code checks the current tile set assigned to the layer "Tiles_trees" and if it is not "ts_Nighttime" then that tile set is assigned to the tile map.