This function can be used to get the tile index (the position of the tile within the tile set image) from a set of tile-data. You give the tile-data, which can be retrieved using the function tilemap_get(), and the function will return an integer value for the index or -1 if there is an error.




Argument Description
tiledata the tile-data to check






var lay_id = layer_get_id("Tiles_sky");
var map_id = layer_tilemap_get_id(lay_id);
var mx = tilemap_get_cell_x_at_pixel(map_id, mouse_x, mouse_y);
var my = tilemap_get_cell_y_at_pixel(map_id, mouse_x, mouse_y);
var data = tilemap_get(map_id, mx, my);
var ind = tile_get_index(data);
data = tile_set_index(data, irandom(23));
tilemap_set(map_id, data, mx, my);

The above code gets the tile map ID from the given layer and then uses that to get the tile-data for the cell under the mouse position. This data is then used to set the tile index to a random number.