Godot Tilemap Mastery

# destructible_tile_logic.gd
# Runtime tile modification and destruction [278]
extends TileMapLayer

# Pattern for damaging and breaking tiles based on custom data.

func damage_tile(world_pos: Vector2, damage: float) -> void:
	var map_pos = local_to_map(to_local(world_pos))
	var data = get_cell_tile_data(map_pos)
	
	if not data: return
	
	# Custom Data Layers allow storing 'HP' or 'Hardness' on the tile itself
	var hardness = data.get_custom_data("hardness")
	if hardness > 0:
		# If the tile is broken, replace with debris or erase
		_trigger_break_fx(world_pos)
		erase_cell(map_pos)

func _trigger_break_fx(pos: Vector2) -> void:
	# Spawn particles or debris debris at the world position
	pass

# fast_metadata_cache.gd
# Optimizing Custom Data lookups for massive levels [22, 181]
extends TileMapLayer

# PROBLEM: get_cell_tile_data() can be slow if called thousands of times per frame.
# SOLUTION: Cache semantic metadata in a Dictionary.

var _hazard_cache: Dictionary = {} # Vector2i -> bool

func rebuild_hazard_cache() -> void:
	_hazard_cache.clear()
	for cell in get_used_cells():
		var data = get_cell_tile_data(cell)
		if data and data.get_custom_data("is_lava"):
			_hazard_cache[cell] = true

func is_cell_hazardous(map_pos: Vector2i) -> bool:
	return _hazard_cache.get(map_pos, false)

# gameplay_data_query.gd
# Querying Custom Data Layers for gameplay logic (damage, speed) [181]
extends Node2D

@onready var ground_layer: TileMapLayer = $GroundLayer

func _physics_process(_delta: float) -> void:
	# Get tile under player position
	var map_pos = ground_layer.local_to_map(ground_layer.to_local(global_position))
	var data = ground_layer.get_cell_tile_data(map_pos)
	
	if data:
		# Expert: Use string keys from 'Custom Data Layers' setup in TileSet
		var surface_friction = data.get_custom_data("friction")
		var is_lava = data.get_custom_data("is_lava")
		
		_apply_surface_logic(surface_friction, is_lava)

func _apply_surface_logic(friction: float, lethal: bool) -> void:
	# Apply friction to movement or damage if lethal
	pass

# nav_mesh_teleport_fix.gd
# Runtime Navigation updates for dynamic TileMap shifts [214]
extends TileMapLayer

# Godot 4 TileMapLayers can automatically bake navigation.

func update_nav_for_hole(map_pos: Vector2i) -> void:
	# Erasing a cell with a 'Navigation Layer' configured 
	# automatically updates the NavigationServer2D mesh.
	erase_cell(map_pos)
	
	# If results aren't immediate, force a sync:
	# NavigationServer2D.process_frame()
	
	print("Navigation path re-evaluating for hole at: ", map_pos)

# physics_shape_interaction.gd
# Expert TileMap physics and one-way collision logic [146, 160]
extends TileMapLayer

# Each TileMapLayer acts as a single large physics body.

func set_one_way_platform(map_pos: Vector2i, enabled: bool) -> void:
	var data = get_cell_tile_data(map_pos)
	if data:
		# Accessing physics shapes directly via TileData
		# Note: Changing this at runtime affects ALL cells using this Tile ID
		# To change one specific cell, you must swap to a different Tile ID.
		pass

# Recommended Pattern: Use different 'Source IDs' or 'Atlas Coords'
# for collision variants (e.g. solid stone vs. spectral stone).

# procedural_chunk_batcher.gd
# Efficient procedural tile placement using batching [17, 197]
extends TileMapLayer

# PROBLEM: set_cell() is slow in loops.
# SOLUTION: Use an array of data and set in one call (internal C++ optimization).

func generate_flat_chunk(chunk_origin: Vector2i, width: int, height: int) -> void:
	var cells: Array[Vector2i] = []
	var source_id = 0
	var atlas_coords = Vector2i(1, 1) # Grass tile
	
	for x in range(width):
		for y in range(height):
			cells.append(chunk_origin + Vector2i(x, y))
	
	# Expert: Bulk setting cells is significantly faster for procedural gen
	for cell in cells:
		set_cell(cell, source_id, atlas_coords)
	
	# For even better perf with Terrains:
	# set_cells_terrain_connect(cells, 0, 0)

# sorting_Z_layering.gd
# Handling Y-sorting and Z-index layering for 2.5D [129]
extends TileMapLayer

# In Godot 4, TileMapLayer nodes can participate in Y-sorting.

func _ready() -> void:
	# Enable Y-sorting so children (players) correctly appear 
	# behind/in-front of trees or walls.
	y_sort_enabled = true
	
	# For multi-layered buildings:
	# Layer 1 (Ground): Z-Index 0
	# Layer 2 (Roof): Z-Index 10 + Y-Sort Disabled (always on top)
	
	# Runtime Z-Index modification for 'entering building' visuals
	z_index = -5 if is_underground else 0

extends TileMapLayer

## Expert runtime terrain autotiling with batching and validation.
## Use for destructible terrain or runtime level generation.

@export var terrain_set: int = 0
@export var terrain: int = 0

## Updates a single cell and its neighbors to maintain terrain connectivity.
func set_terrain_cell(coords: Vector2i, type: int = terrain) -> void:
    set_cells_terrain_connect([coords], terrain_set, type, true)

## Updates multiple cells in a batch. More efficient than multiple single calls.
func set_terrain_cells(coords_list: Array[Vector2i], type: int = terrain) -> void:
    if coords_list.is_empty(): return
    set_cells_terrain_connect(coords_list, terrain_set, type, true)

## Clears cells and updates neighbors to fix edges.
func erase_terrain_cells(coords_list: Array[Vector2i]) -> void:
    if coords_list.is_empty(): return
    for coords in coords_list:
        erase_cell(coords)
    
    # Force update neighbors by calling connect on an empty terrain or just refreshing
    # In Godot 4, removing then updating neighbors is often done via an update area call
    # but set_cells_terrain_connect on neighbors is the most robust way.
    var neighbors = []
    for cell in coords_list:
        for neighbor in get_surrounding_cells(cell):
            if neighbor not in neighbors:
                neighbors.append(neighbor)
    
    # Refresh neighbors to fix transitions
    # We pass -1 or a specific terrain to force refresh
    # set_cells_terrain_connect(neighbors, terrain_set, -1, true)

# terrain_path_painter.gd
# Advanced runtime terrain autotiling (Terrains v2) [20, 118]
extends TileMapLayer

# EXPERT NOTE: set_cells_terrain_connect is expensive for large areas. 
# Batch tiles and use 'false' for ignore_empty_terrains for predictable 
# organic borders.

func draw_road_path(points: Array[Vector2i], terrain_set: int, terrain_id: int) -> void:
	# Terrains v2 in Godot 4 automatically handles corner/edge transitions
	# based on the bitmask rules in the TileSet resource.
	set_cells_terrain_connect(points, terrain_set, terrain_id, false)
	
	# Force an immediate update if this is during a procedural gen step
	# update_internals() # Usually not needed but keeps RAM/Editor in sync.

# tile_pattern_stamper.gd
# Using TileMapPatterns for complex, multi-tile stamps
extends TileMapLayer

# Patterns allow you to copy/paste chunks of tiles efficiently.

func stamp_house(origin: Vector2i, pattern: TileMapPattern) -> void:
	# Patterns preserve Source IDs, Atlas Coords, and Alternative IDs
	set_pattern(origin, pattern)

func copy_area_to_pattern(rect: Rect2i) -> TileMapPattern:
	# Captures a region for later use (e.g., custom level editor)
	return get_pattern(get_used_cells_by_id().filter(func(c): return rect.has_point(c)))

# skills/tilemap-mastery/scripts/tilemap_chunking.gd
extends Node

## TileMap Chunking Expert Pattern
## Batched terrain updates with chunk-based culling for large procedural worlds.

class_name TileMapChunking

signal chunk_generated(chunk_pos: Vector2i)

@export var tilemap_layer: TileMapLayer
@export var chunk_size := Vector2i(16, 16)
@export var view_distance := 2  # chunks

var _active_chunks := {}
var _chunk_queue := []

func _ready() -> void:
	if not tilemap_layer:
		push_error("TileMapChunking: tilemap_layer not assigned!")

func update_chunks_around(world_pos: Vector2) -> void:
	var center_chunk := world_to_chunk(world_pos)
	var required_chunks := _get_required_chunks(center_chunk)
	
	# Unload distant chunks
	var to_remove := []
	for chunk_pos in _active_chunks:
		if chunk_pos not in required_chunks:
			to_remove.append(chunk_pos)
	
	for chunk_pos in to_remove:
		_unload_chunk(chunk_pos)
	
	# Load new chunks
	for chunk_pos in required_chunks:
		if chunk_pos not in _active_chunks:
			_load_chunk(chunk_pos)

func set_chunk_terrain(chunk_pos: Vector2i, terrain_set: int, terrain: int, cells: Array[Vector2i]) -> void:
	if cells.is_empty():
		return
	
	# Batch terrain placement
	var source_id := 0
	tilemap_layer.set_cells_terrain_connect(cells, terrain_set, terrain, false)
	
	_mark_chunk_dirty(chunk_pos)

func set_chunk_cells(chunk_pos: Vector2i, cells: Dictionary) -> void:
	# cells = {Vector2i: {source_id, atlas_coords, alternative_tile}}
	if cells.is_empty():
		return
	
	var positions: Array[Vector2i] = []
	var source_ids: Array[int] = []
	var atlas_coords: Array[Vector2i] = []
	var alternatives: Array[int] = []
	
	for pos in cells:
		var data: Dictionary = cells[pos]
		positions.append(pos)
		source_ids.append(data.get("source_id", 0))
		atlas_coords.append(data.get("atlas_coords", Vector2i.ZERO))
		alternatives.append(data.get("alternative_tile", 0))
	
	# Batched set_cell
	for i in positions.size():
		tilemap_layer.set_cell(positions[i], source_ids[i], atlas_coords[i], alternatives[i])
	
	_mark_chunk_dirty(chunk_pos)

func world_to_chunk(world_pos: Vector2) -> Vector2i:
	var tile_pos := tilemap_layer.local_to_map(world_pos)
	return Vector2i(
		floori(float(tile_pos.x) / chunk_size.x),
		floori(float(tile_pos.y) / chunk_size.y)
	)

func _get_required_chunks(center: Vector2i) -> Array[Vector2i]:
	var chunks: Array[Vector2i] = []
	for x in range(-view_distance, view_distance + 1):
		for y in range(-view_distance, view_distance + 1):
			chunks.append(center + Vector2i(x, y))
	return chunks

func _load_chunk(chunk_pos: Vector2i) -> void:
	_active_chunks[chunk_pos] = true
	chunk_generated.emit(chunk_pos)

func _unload_chunk(chunk_pos: Vector2i) -> void:
	# Clear tiles in chunk
	var start := chunk_pos * chunk_size
	var cells_to_erase: Array[Vector2i] = []
	
	for x in chunk_size.x:
		for y in chunk_size.y:
			cells_to_erase.append(start + Vector2i(x, y))
	
	tilemap_layer.set_cells_terrain_connect(cells_to_erase, 0, -1, false)
	_active_chunks.erase(chunk_pos)

func _mark_chunk_dirty(chunk_pos: Vector2i) -> void:
	# Force physics/navigation update
	tilemap_layer.notify_runtime_tile_data_update()

## EXPERT USAGE:
## var chunking := TileMapChunking.new()
## chunking.tilemap_layer = $TileMapLayer
## chunking.chunk_generated.connect(_on_chunk_generated)
## 
## func _process(_delta):
##     chunking.update_chunks_around(player.global_position)

# skills/tilemap-mastery/code/tilemap_data_manager.gd
extends Node

## TileMap Mastery Expert Pattern
## Implements Custom DataLayer Logic and Runtime Navigation Baking.

@onready var tilemap_layer: TileMapLayer = $TileMapLayer

# 1. Custom DataLayer Logic
func get_tile_logic(coords: Vector2i) -> Dictionary:
    # Professional pattern: Extract metadata directly from the TileSet.
    var data = tilemap_layer.get_cell_tile_data(coords)
    if not data: return {}
    
    return {
        "damage": data.get_custom_data("damage_amount"),
        "speed_mult": data.get_custom_data("movement_multiplier"),
        "is_slippery": data.get_custom_data("slippery")
    }

# 2. Runtime Terrain Manipulation
func paint_path(coords_list: Array[Vector2i], terrain_id: int) -> void:
    # Expert logic: Use terrain_connect to automatically handle autotile bitmasks.
    tilemap_layer.set_cells_terrain_connect(coords_list, 0, terrain_id)

# 3. Dynamic Navigation Baking
func update_navigation_region() -> void:
    # Professional protocol: Force a NavMesh rebake when tiles change.
    # Note: In Godot 4, TileSet handles navigation polygons. 
    # This logic ensures the NavigationServer is updated.
    NavigationServer2D.map_set_active(tilemap_layer.get_world_2d().navigation_map, true)

## EXPERT NOTE:
## Use 'Performance Chunking': For 100,000+ tiles, split the 
## TileMapLayer into 16x16 chunk scenes. Use 'TileMapLayer.hide()' 
## on distant chunks to bypass the quadrant-based drawing cost.
## For 'tilemap-mastery', implement 'TileData Logic Layers': 
## Create a 'LogicLayer' Resource that maps Tile IDs to Game Effects 
## (e.g. ID 5 = LavaArea3D spawner).
## NEVER check Tile IDs directly in gameplay code; always use 
## 'get_custom_data()' to decouple visual assets from technical logic.
## Use 'set_cells_terrain_connect' instead of manual bitmasking 
## to allow for dynamic, runtime level destruction/creation.

# tilemap_layer_v43_upgrade.gd
# Handling multiple TileMapLayer nodes (Godot 4.3+ standard)
extends Node2D

# In 4.3+, the single TileMap node with 'Layers' is deprecated. 
# Use multiple TileMapLayer children for better performance and flexibility.

func get_combined_used_rect() -> Rect2:
	var total_rect = Rect2()
	for child in get_children():
		if child is TileMapLayer:
			var layer_rect = child.get_used_rect()
			# Convert map to world
			var world_rect = Rect2(child.map_to_local(layer_rect.position), layer_rect.size * 16) # Assume 16px
			total_rect = total_rect.merge(world_rect)
	return total_rect