Godot Genre Rts

# building_grid_astar.gd
extends Node
class_name BuildingGridAStar

# Grid-Based AStar for Base Building
# Instant grid pathfinding for placing structures and unit grid-navigation.

var astar_grid := AStarGrid2D.new()

func init_grid(size: Vector2i, cell_size: Vector2) -> void:
    astar_grid.region = Rect2i(Vector2i.ZERO, size)
    astar_grid.cell_size = cell_size
    astar_grid.diagonal_mode = AStarGrid2D.DIAGONAL_MODE_NEVER
    astar_grid.update()

func mark_occupied(cell: Vector2i, occupied: bool) -> void:
    # Pattern: AStarGrid2D is much faster than Node-based AStar for grid RTS.
    astar_grid.set_point_solid(cell, occupied)

func is_cell_valid(cell: Vector2i) -> bool:
    return not astar_grid.is_point_solid(cell)

extends CharacterBody3D
class_name CrowdNavigationUnit

## Expert Crowd Pathfinding (Godot 4.6).
## Optimized RVO avoidance with arrival dampening.

@onready var nav_agent: NavigationAgent3D = $NavigationAgent3D

func _ready() -> void:
	nav_agent.avoidance_enabled = true
	# Expert Pattern: Increase distance to prevent "dancing" at target
	nav_agent.target_desired_distance = 1.5
	nav_agent.velocity_computed.connect(_move_unit)

func set_move_target(target: Vector3) -> void:
	nav_agent.target_position = target

func _physics_process(_delta: float) -> void:
	if nav_agent.is_navigation_finished(): return
	
	var next_path_pos = nav_agent.get_next_path_position()
	var new_vel = global_position.direction_to(next_path_pos) * 5.0
	# Send preferred velocity to NavigationServer for RVO processing
	nav_agent.set_velocity(new_vel)

func _move_unit(safe_vel: Vector3) -> void:
	velocity = safe_vel
	move_and_slide()

## [SKILL NOTICE]: Set 'target_desired_distance' > 1.0 for crowds. 
## This prevents units from oscillating indefinitely when they reach a dense target.

# fog_of_war_tile_mask.gd
extends Node2D
class_name FogOfWarTileMask

# TileMapLayer Fog of War Masking
# Efficiently clears Fog of War using the 2D TileMapLayer grid.

@export var fog_layer: TileMapLayer

func reveal_circular_area(world_pos: Vector2, radius_cells: int) -> void:
    if not fog_layer: return
    
    # Pattern: Map world position to discrete 2i grid coordinates.
    var center := fog_layer.local_to_map(fog_layer.to_local(world_pos))
    
    for x in range(-radius_cells, radius_cells + 1):
        for y in range(-radius_cells, radius_cells + 1):
            if Vector2(x, y).length() <= radius_cells:
                # pass -1 to layer to "clear" the fog cell.
                fog_layer.set_cell(center + Vector2i(x, y), -1)

extends Node

## Expert RTS Economy (Godot 4.6).
## Global Singleton for decoupled resource management.

signal budget_updated(res_id: String, new_total: int)

var _bank: Dictionary = {"gold": 1000, "iron": 500}

func try_spend(costs: Dictionary) -> bool:
	# 1. Verification Pass
	for id in costs:
		if _bank.get(id, 0) < costs[id]: return false
	
	# 2. Deduction Pass
	for id in costs:
		_bank[id] -= costs[id]
		budget_updated.emit(id, _bank[id])
	return true

func add_funds(id: String, amount: int) -> void:
	_bank[id] = _bank.get(id, 0) + amount
	budget_updated.emit(id, _bank[id])

## [SKILL NOTICE]: Use a 'Dictionary'-based cost system within an 'Autoload'. 
## This allows flexible multi-resource checkouts (e.g., Gold + Iron) for units.

# navigation_mask_helper.gd
extends RefCounted
class_name NavigationMaskHelper

# Navigation Layer Bitmasking for Avoidance
# Dynamically alters agent layers to ignore hazard regions or locked gates.

static func toggle_navigation_layer(agent: NavigationAgent3D, layer_index: int, enabled: bool) -> void:
    # Pattern: Bitwise masking for efficient layer management.
    if enabled:
        agent.navigation_layers |= (1 << layer_index)
    else:
        agent.navigation_layers &= ~(1 << layer_index)

static func set_swimming_capability(agent: NavigationAgent3D, can_swim: bool) -> void:
    # Example: Layer 2 is water.
    toggle_navigation_layer(agent, 2, can_swim)

# rendering_ghost_spawner.gd
extends Node
class_name RenderingGhostSpawner

# Server-Side Rendering for Building Ghosts
# Bypasses SceneTree overhead for ghost visuals using RenderingServer.

var _ghost_rid: RID

func create_placement_ghost(mesh_rid: RID, scenario: RID) -> void:
    # Pattern: Directly instantiate in visual server to avoid costly Node lifecycle.
    _ghost_rid = RenderingServer.instance_create()
    RenderingServer.instance_set_base(_ghost_rid, mesh_rid)
    RenderingServer.instance_set_scenario(_ghost_rid, scenario)
    
    # Optional: Apply ghost shader/material.
    # RenderingServer.instance_set_surface_override_material(...)

func update_ghost_transform(xform: Transform3D) -> void:
    if _ghost_rid.is_valid():
        RenderingServer.instance_set_transform(_ghost_rid, xform)

func destroy_ghost() -> void:
    if _ghost_rid.is_valid():
        RenderingServer.free_rid(_ghost_rid)

# rts_army_manager.gd
extends Node
class_name RTSArmyManager

# High-Performance Multithreaded AI Updates
# Offloads thousands of unit state calculations to background worker threads.

var _units: Array[Node] = []

func _physics_process(_delta: float) -> void:
    if _units.is_empty(): return
    
    # Pattern: Use WorkerThreadPool to distribute heavy AI/Targeting across all cores.
    var task_id := WorkerThreadPool.add_group_task(_process_unit_ai, _units.size())
    
    # IMPORTANT: Wait for completion if subsequent logic (like movement) depends on results.
    WorkerThreadPool.wait_for_group_task_completion(task_id)

func _process_unit_ai(index: int) -> void:
    var unit := _units[index]
    # Execute expensive logic here: Targeting, LOS checks, or state evaluation.
    pass

func register_unit(unit: Node) -> void:
    _units.append(unit)

func unregister_unit(unit: Node) -> void:
    _units.erase(unit)

# rts_group_commander.gd
extends Node
class_name RTSGroupCommander

# Decoupled Group Broadcasting for Mass Commands
# Instantly alerts all units in a control group without hardcoded array iteration.

func order_move_group(group_id: StringName, target_pos: Vector3) -> void:
    # Pattern: Use call_group_flags with DEFERRED and UNIQUE for safety and efficiency.
    var flags := SceneTree.GROUP_CALL_DEFERRED | SceneTree.GROUP_CALL_UNIQUE
    
    get_tree().call_group_flags(
        flags,
        group_id,      # Target group (e.g., &"group_1")
        &"move_to",    # Target method in unit script
        target_pos     # Arg
    )

# rts_path_query_pool.gd
extends Node3D
class_name RTSPathQueryPool

# Object-Pooled Navigation Path Queries
# Reuses query objects to prevent constant heap allocation during mass move orders.

var _query_params := NavigationPathQueryParameters3D.new()
var _query_result := NavigationPathQueryResult3D.new()

func get_optimized_path(start: Vector3, target: Vector3, layers: int = 1) -> PackedVector3Array:
    # Pattern: Configure pre-allocated query objects instead of creating new ones.
    _query_params.start_position = start
    _query_params.target_position = target
    _query_params.navigation_layers = layers
    _query_params.path_postprocessing = NavigationPathQueryParameters3D.PATH_POSTPROCESSING_CORRIDORFUNNEL
    
    var map_rid := get_world_3d().get_navigation_map()
    NavigationServer3D.query_path(map_rid, _query_params, _query_result)
    
    return _query_result.path

extends Control
class_name RTSSelectionOverlay

## Expert Box Selection (Godot 4.6).
## Draws a 2D box and projects 3D units to screen space for selection.

@export var camera: Camera3D
@export var box_color = Color(0, 1, 0, 0.2)

var _start_pos = Vector2.ZERO
var _is_dragging = false

func _unhandled_input(event: InputEvent) -> void:
	if event is InputEventMouseButton and event.button_index == MOUSE_BUTTON_LEFT:
		if event.pressed:
			_start_pos = event.position
			_is_dragging = true
		else:
			_is_dragging = false
			_select_units(Rect2(_start_pos, event.position - _start_pos).abs())
			queue_redraw()
	
	if event is InputEventMouseMotion and _is_dragging:
		queue_redraw()

func _draw() -> void:
	if _is_dragging:
		draw_rect(Rect2(_start_pos, get_local_mouse_position() - _start_pos), box_color, true)

func _select_units(rect: Rect2) -> void:
	var selected = []
	for unit in get_tree().get_nodes_in_group("units"):
		if camera.is_position_behind(unit.global_position): continue
		var screen_pos = camera.unproject_position(unit.global_position)
		if rect.has_point(screen_pos):
			selected.append(unit)
			unit.set_selected(true)

## [SKILL NOTICE]: Project 3D positions to 2D for box selection. It is much 
## more performant than scaling a 3D Area3D or frustum-casting every frame.

# rts_targeting_logic.gd
extends RefCounted
class_name RTSTargetingLogic

# Fast Distance Squared Checking
# Bypasses expensive square-root math when filtering thousands of potential targets.

static func find_nearest_target(origin: Vector3, targets: Array[Node3D]) -> Node3D:
    var best_target: Node3D = null
    var min_dist_sq := INF
    
    for target in targets:
        # Pattern: Use distance_squared_to to save CPU cycles in mass loops.
        var d_sq := origin.distance_squared_to(target.global_position)
        if d_sq < min_dist_sq:
            min_dist_sq = d_sq
            best_target = target
            
    return best_target

# rts_unit_stat_duplicator.gd
extends Node
class_name RTSUnitStatDuplicator

# Deep Duplication of Unit Stats
# Ensures unique health/armor per unit instead of sharing a global Resource.

@export var base_stats: Resource
var active_stats: Resource

func _ready() -> void:
    if base_stats:
        # Pattern: Deep duplication to isolate dictionaries/arrays within the resource.
        active_stats = base_stats.duplicate(true)

func modify_stat(stat_name: StringName, amount: float) -> void:
    if active_stats and stat_name in active_stats:
        active_stats.set(stat_name, active_stats.get(stat_name) + amount)

# skills/genre-rts/scripts/rts_unit.gd
extends CharacterBody2D

## RTS Unit Entity (Expert Pattern)
## Handles state machine logic (Idle, Move, Attack) and pathfinding.
## Integrates with NavigationAgent2D for RVO avoidance.

class_name RTSUnit

enum State { IDLE, MOVE, ATTACK, HOLD }

@export var speed: float = 150.0
@export var attack_range: float = 40.0
@export var damage: int = 5
@export var nav_agent: NavigationAgent2D

var state: State = State.IDLE
var current_target: Node2D
var _is_selected: bool = false
@onready var selection_visual: Sprite2D = $SelectionCircle

func _ready() -> void:
    # Setup RVO
    nav_agent.velocity_computed.connect(_on_velocity_computed)
    nav_agent.avoidance_enabled = true
    nav_agent.radius = 20.0
    
    if selection_visual:
        selection_visual.visible = false

func move_to(target_pos: Vector2) -> void:
    nav_agent.target_position = target_pos
    state = State.MOVE

func set_selected(selected: bool) -> void:
    _is_selected = selected
    if selection_visual:
        selection_visual.visible = selected

func _physics_process(delta: float) -> void:
    if state == State.MOVE:
        if nav_agent.is_navigation_finished():
            state = State.IDLE
            velocity = Vector2.ZERO
            return
            
        var next = nav_agent.get_next_path_position()
        var dir = global_position.direction_to(next)
        
        # Trigger avoidance calc
        nav_agent.set_velocity(dir * speed)
        
    elif state == State.ATTACK:
        # Attack logic here
        pass

func _on_velocity_computed(safe_velocity: Vector2) -> void:
    # Callback from RVO avoidance
    velocity = safe_velocity
    move_and_slide()

## EXPERT USAGE:
## Attach NavigationAgent2D CHILD. Assign it to 'nav_agent'.
## Connect 'velocity_computed' signal in inspector or _ready (done above).

# godot-master/scripts/rts_rts_selection_manager.gd
extends Node2D

## RTS Selection Manager (Expert Pattern)
## Handles 2D/3D unit selection via drag box and single clicks.
## Supports Shift-Add and broadcasting commands to selected units.

class_name RTSSelectionManager

signal selection_changed(selected_units: Array)

@export var selection_box_color: Color = Color(0, 1, 0, 0.3)
@export var selection_border_color: Color = Color(0, 1, 0, 1)

var selected_units: Array = []
var drag_start: Vector2 = Vector2.ZERO
var is_dragging: bool = false
var _box_rect: Rect2

func _unhandled_input(event: InputEvent) -> void:
    if event is InputEventMouseButton:
        if event.button_index == MOUSE_BUTTON_LEFT:
            if event.pressed:
                _start_drag(event.position)
            else:
                _end_drag(event.position)
        elif event.button_index == MOUSE_BUTTON_RIGHT and event.pressed:
            _issue_move_command(get_global_mouse_position()) # Or raycast for 3D

    elif event is InputEventMouseMotion and is_dragging:
        queue_redraw()

func _start_drag(pos: Vector2) -> void:
    drag_start = pos
    is_dragging = true

func _end_drag(pos: Vector2) -> void:
    is_dragging = false
    queue_redraw()
    
    var drag_rect = Rect2(drag_start, pos - drag_start).abs()
    
    if not Input.is_key_pressed(KEY_SHIFT):
        _deselect_all()
    
    if drag_rect.size.length_squared() < 100:
        # Single Click
        _select_at_point(pos)
    else:
        # Box Select
        _select_in_rect(drag_rect)
    
    selection_changed.emit(selected_units)

func _select_at_point(pos: Vector2) -> void:
    # 2D Implementation (Physics Query)
    var space = get_world_2d().direct_space_state
    var query = PhysicsPointQueryParameters2D.new()
    query.position = get_global_mouse_position() # Use global for query
    query.collide_with_areas = true # Assuming units have areas or bodies
    
    var results = space.intersect_point(query)
    if not results.is_empty():
        var unit = results[0].collider
        if unit.has_method("set_selected"):
            _add_to_selection(unit)

func _select_in_rect(rect: Rect2) -> void:
    # Need to convert Viewport Screen Rect to World Rect if camera moves
    # For now assuming simple 2D screen-space match or using `get_global_mouse_position` logic
    # Better: Query physics with a Shape
    
    var space = get_world_2d().direct_space_state
    var query = PhysicsShapeQueryParameters2D.new()
    var shape = RectangleShape2D.new()
    shape.size = rect.size
    query.shape = shape
    query.transform = Transform2D(0, (drag_start + (rect.size / 2)) + get_canvas_transform().origin ) # Rough approximation, requires camera awareness
    
    # Actually, easiest is to iterate all "selectable" group nodes and check if inside rect
    # This avoids complex shape transform math for screen-to-world rect
    var candidates = get_tree().get_nodes_in_group("selectable")
    for unit in candidates:
        # Check if unit screen position is inside drag_rect
        var screen_pos = unit.get_global_transform_with_canvas().origin
        if rect.has_point(screen_pos):
             _add_to_selection(unit)

func _add_to_selection(unit: Node) -> void:
    if unit not in selected_units:
        selected_units.append(unit)
        unit.set_selected(true)

func _deselect_all() -> void:
    for unit in selected_units:
        if is_instance_valid(unit):
            unit.set_selected(false)
    selected_units.clear()

func _issue_move_command(target: Vector2) -> void:
    for unit in selected_units:
        if unit.has_method("move_to"):
            unit.move_to(target)

func _draw() -> void:
    if is_dragging:
        var mouse = get_local_mouse_position()
        var rect = Rect2(drag_start, mouse - drag_start)
        draw_rect(rect, selection_box_color, true)
        draw_rect(rect, selection_border_color, false, 2.0)

## EXPERT USAGE:
## Add units to "selectable" group. Implement set_selected(bool) and move_to(pos) on units.
## For 3D, replace PhysicsPointQueryParameters2D with Raycast logic.

# rts_selection_manager.gd
extends Node3D
class_name RTSSelectionManager

# Fast Physics-Server Raycasting for Unit Selection
# Bypasses SceneTree overhead by querying the C++ PhysicsServer3D directly.

func select_unit_at_mouse(camera: Camera3D, mouse_pos: Vector2) -> Object:
    var space_state := get_world_3d().direct_space_state
    
    # Standard ray projection from camera.
    var origin := camera.project_ray_origin(mouse_pos)
    var normal := camera.project_ray_normal(mouse_pos)
    
    var query := PhysicsRayQueryParameters3D.create(origin, origin + normal * 1000.0)
    query.collide_with_areas = false
    query.collide_with_bodies = true
    
    # Pattern: Direct server lookup is faster than Area3D detection for mass units.
    var result := space_state.intersect_ray(query)
    return result.get("collider") if not result.is_empty() else null