Godot 4 Tilemap tricks

godot4_tilemap_tricks.gd

## Registers a tile with the tilemap that can then be placed
## via tile_map.set_cell(layer_index, map_coord, tile_id, Vector2i(0, 0))
func register_tile_and_get_id(tile_map:TileMap, texture:Texture2D, tile_size:int) -> int:
    var tileset = tile_map.tile_set
    var source = TileSetAtlasSource.new()
    source.texture = texture
    source.texture_region_size = Vector2i(tile_size, tile_size)
    source.create_tile(Vector2i(0, 0))
    return tileset.add_source(source)
    
## Places an autotile at position x,y (supports list of points)
func set_terrain(map_coords:Array[Vector2i]) -> void:
	tile_map.set_cells_terrain_connect(0, map_coords, 0, 0, true)

## Noise texture that comes with its own noise editor in the properties section!
@export var noise:FastNoiseLite = FastNoiseLite.new()

## Given a terrain on a tileset, this code will generate a cave
## (noise may need to betweaked within the editor)
func generate_cave(tile_map:TileMap, map_w:int, map_h:int, seed:int, threshold:float) -> void:
	noise.seed = seed
	var air_positions:Array[Vector2i] = []
	
	for x in range(-map_w / 2, map_w / 2):
		for y in range(-map_h / 2, map_h / 2):
			var tile_id = tile_map.get_cell_source_id(0, Vector2i(x, y), false)
			# ensure we do not draw on already placed tiles
			if tile_id != -1:
				continue
			var noise_value = noise.get_noise_2d(x, y)
			elif threshold >= noise_value:
				air_positions.append(Vector2i(x, y))

	set_terrain(air_positions)