godot-combat-system

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Combat System

战斗系统

Expert guidance for building flexible, component-based combat systems.

构建灵活的、基于组件的战斗系统的专业指南。

NEVER Do

绝对禁止的操作

NEVER use direct damage references (
target.health -= 10
) — Bypasses armor, resistance, events. Use DamageData + HealthComponent pattern.
NEVER forget invincibility frames — Without i-frames, multi-hit attacks deal damage every frame. Add 0.5-1s invincibility after hit.
NEVER keep hitboxes active permanently — Enable/disable hitboxes with animation tracks. Permanent hitboxes cause unintended damage.
NEVER use groups for hitbox filtering — Use collision layers. Groups don't respect physics layers and cause friendly fire.
NEVER emit damage_received without DamageData — Raw int/float damage loses context (source, type, knockback). Always use DamageData class.

绝对不要直接修改生命值（
target.health -= 10
） — 这种方式会绕过护甲、抗性和事件机制，请使用DamageData + HealthComponent模式。
绝对不要忽略无敌帧 — 没有无敌帧的话，多段攻击会每帧都造成伤害，受击后应添加0.5-1秒的无敌时间。
绝对不要让碰撞箱始终处于激活状态 — 应通过动画轨道来启用/禁用碰撞箱，永久激活的碰撞箱会导致意外伤害。
绝对不要用分组来过滤碰撞箱 — 请使用碰撞层，分组不会遵循物理层规则，会导致友军误伤。
绝对不要在没有DamageData的情况下触发damage_received信号 — 直接传递整数/浮点数伤害会丢失上下文信息（来源、类型、击退效果），务必使用DamageData类。

Available Scripts

可用脚本

MANDATORY: Read the appropriate script before implementing the corresponding pattern.

强制要求：在实现对应模式前，请先阅读相应的脚本。

hitbox_hurtbox.gd

Component-based hitbox with hit-stop and knockback. Uses Engine.time_scale with ignore_time_scale timer for proper hit-stop freeze frame.

基于组件的碰撞箱，包含击中停顿和击退效果。使用Engine.time_scale结合ignore_time_scale计时器来实现正确的击中停顿帧效果。

Damage System

伤害系统

gdscript

undefined

gdscript

undefined

damage_data.gd

class_name DamageData extends RefCounted

var amount: float var source: Node var damage_type: String = "physical" var knockback: Vector2 = Vector2.ZERO var is_critical: bool = false

func _init(dmg: float, src: Node = null) -> void: amount = dmg source = src

undefined

class_name DamageData extends RefCounted

var amount: float var source: Node var damage_type: String = "physical" var knockback: Vector2 = Vector2.ZERO var is_critical: bool = false

func _init(dmg: float, src: Node = null) -> void: amount = dmg source = src

undefined

Hurtbox/Hitbox Pattern

受击箱/碰撞箱模式

gdscript

undefined

gdscript

undefined

hurtbox.gd

extends Area2D class_name Hurtbox

signal damage_received(data: DamageData)

@export var health_component: Node

func _ready() -> void: area_entered.connect(_on_area_entered)

func _on_area_entered(area: Area2D) -> void: if area is Hitbox: var damage := area.get_damage() damage_received.emit(damage)

    if health_component:
        health_component.take_damage(damage)


```gdscript

extends Area2D class_name Hurtbox

signal damage_received(data: DamageData)

@export var health_component: Node

func _ready() -> void: area_entered.connect(_on_area_entered)

func _on_area_entered(area: Area2D) -> void: if area is Hitbox: var damage := area.get_damage() damage_received.emit(damage)

    if health_component:
        health_component.take_damage(damage)


```gdscript

hitbox.gd

extends Area2D class_name Hitbox

@export var damage: float = 10.0 @export var damage_type: String = "physical" @export var knockback_force: float = 100.0 @export var owner_node: Node

func get_damage() -> DamageData: var data := DamageData.new(damage, owner_node) data.damage_type = damage_type

# Calculate knockback direction
if owner_node:
    var direction := (global_position - owner_node.global_position).normalized()
    data.knockback = direction * knockback_force

return data

undefined

extends Area2D class_name Hitbox

@export var damage: float = 10.0 @export var damage_type: String = "physical" @export var knockback_force: float = 100.0 @export var owner_node: Node

func get_damage() -> DamageData: var data := DamageData.new(damage, owner_node) data.damage_type = damage_type

# Calculate knockback direction
if owner_node:
    var direction := (global_position - owner_node.global_position).normalized()
    data.knockback = direction * knockback_force

return data

undefined

Health Component

生命值组件

gdscript

undefined

gdscript

undefined

health_component.gd

extends Node class_name HealthComponent

signal health_changed(old_health: float, new_health: float) signal died signal healed(amount: float)

@export var max_health: float = 100.0 @export var current_health: float = 100.0 @export var invincible: bool = false

func take_damage(data: DamageData) -> void: if invincible: return

var old_health := current_health
current_health -= data.amount
current_health = clampf(current_health, 0, max_health)

health_changed.emit(old_health, current_health)

if current_health <= 0:
    died.emit()

func heal(amount: float) -> void: var old_health := current_health current_health += amount current_health = minf(current_health, max_health)

healed.emit(amount)
health_changed.emit(old_health, current_health)

func is_dead() -> bool: return current_health <= 0

undefined

extends Node class_name HealthComponent

signal health_changed(old_health: float, new_health: float) signal died signal healed(amount: float)

@export var max_health: float = 100.0 @export var current_health: float = 100.0 @export var invincible: bool = false

func take_damage(data: DamageData) -> void: if invincible: return

var old_health := current_health
current_health -= data.amount
current_health = clampf(current_health, 0, max_health)

health_changed.emit(old_health, current_health)

if current_health <= 0:
    died.emit()

func heal(amount: float) -> void: var old_health := current_health current_health += amount current_health = minf(current_health, max_health)

healed.emit(amount)
health_changed.emit(old_health, current_health)

func is_dead() -> bool: return current_health <= 0

undefined

Combat State Machine

战斗状态机

gdscript

undefined

gdscript

undefined

combat_state.gd

extends Node class_name CombatState

enum State { IDLE, ATTACKING, BLOCKING, DODGING, STUNNED }

var current_state: State = State.IDLE var can_act: bool = true

func enter_attack_state() -> bool: if not can_act: return false

current_state = State.ATTACKING
can_act = false
return true

func enter_block_state() -> void: current_state = State.BLOCKING

func enter_dodge_state() -> bool: if not can_act: return false

current_state = State.DODGING
can_act = false
return true

func exit_state() -> void: current_state = State.IDLE can_act = true

undefined

extends Node class_name CombatState

enum State { IDLE, ATTACKING, BLOCKING, DODGING, STUNNED }

var current_state: State = State.IDLE var can_act: bool = true

func enter_attack_state() -> bool: if not can_act: return false

current_state = State.ATTACKING
can_act = false
return true

func enter_block_state() -> void: current_state = State.BLOCKING

func enter_dodge_state() -> bool: if not can_act: return false

current_state = State.DODGING
can_act = false
return true

func exit_state() -> void: current_state = State.IDLE can_act = true

undefined

Combo System

连招系统

gdscript

undefined

gdscript

undefined

combo_system.gd

extends Node class_name ComboSystem

signal combo_executed(combo_name: String)

@export var combo_window: float = 0.5 var combo_buffer: Array[String] = [] var last_input_time: float = 0.0

func register_input(action: String) -> void: var current_time := Time.get_ticks_msec() / 1000.0

if current_time - last_input_time > combo_window:
    combo_buffer.clear()

combo_buffer.append(action)
last_input_time = current_time

check_combos()

func check_combos() -> void: # Light → Light → Heavy = Special Attack if combo_buffer.size() >= 3: var last_three := combo_buffer.slice(-3) if last_three == ["light", "light", "heavy"]: execute_combo("special_attack") combo_buffer.clear()

func execute_combo(combo_name: String) -> void: combo_executed.emit(combo_name)

undefined

extends Node class_name ComboSystem

signal combo_executed(combo_name: String)

@export var combo_window: float = 0.5 var combo_buffer: Array[String] = [] var last_input_time: float = 0.0

func register_input(action: String) -> void: var current_time := Time.get_ticks_msec() / 1000.0

if current_time - last_input_time > combo_window:
    combo_buffer.clear()

combo_buffer.append(action)
last_input_time = current_time

check_combos()

func execute_combo(combo_name: String) -> void: combo_executed.emit(combo_name)

undefined

Ability System

技能系统

gdscript

undefined

gdscript

undefined

ability.gd

class_name Ability extends Resource

@export var ability_name: String @export var cooldown: float = 1.0 @export var damage: float = 25.0 @export var range: float = 100.0 @export var animation: String

var is_on_cooldown: bool = false

func can_use() -> bool: return not is_on_cooldown

func use(caster: Node) -> void: if not can_use(): return

is_on_cooldown = true

# Execute ability logic
_execute(caster)

# Start cooldown
await caster.get_tree().create_timer(cooldown).timeout
is_on_cooldown = false

func _execute(caster: Node) -> void: # Override in derived abilities pass

undefined

class_name Ability extends Resource

@export var ability_name: String @export var cooldown: float = 1.0 @export var damage: float = 25.0 @export var range: float = 100.0 @export var animation: String

var is_on_cooldown: bool = false

func can_use() -> bool: return not is_on_cooldown

func use(caster: Node) -> void: if not can_use(): return

is_on_cooldown = true

# Execute ability logic
_execute(caster)

# Start cooldown
await caster.get_tree().create_timer(cooldown).timeout
is_on_cooldown = false

func _execute(caster: Node) -> void: # Override in derived abilities pass

undefined

Damage Popups

伤害飘字

gdscript

undefined

gdscript

undefined

damage_popup.gd

extends Label

func show_damage(amount: float, is_crit: bool = false) -> void: text = str(int(amount))

if is_crit:
    modulate = Color.RED
    scale = Vector2(1.5, 1.5)

var tween := create_tween()
tween.set_parallel(true)
tween.tween_property(self, "position:y", position.y - 50, 1.0)
tween.tween_property(self, "modulate:a", 0.0, 1.0)
tween.finished.connect(queue_free)

undefined

extends Label

func show_damage(amount: float, is_crit: bool = false) -> void: text = str(int(amount))

if is_crit:
    modulate = Color.RED
    scale = Vector2(1.5, 1.5)

var tween := create_tween()
tween.set_parallel(true)
tween.tween_property(self, "position:y", position.y - 50, 1.0)
tween.tween_property(self, "modulate:a", 0.0, 1.0)
tween.finished.connect(queue_free)

undefined

Critical Hits

暴击机制

gdscript

func calculate_damage(base_damage: float, crit_chance: float = 0.1) -> DamageData:
    var data := DamageData.new(base_damage)
    
    if randf() < crit_chance:
        data.is_critical = true
        data.amount *= 2.0
    
    return data

gdscript

func calculate_damage(base_damage: float, crit_chance: float = 0.1) -> DamageData:
    var data := DamageData.new(base_damage)
    
    if randf() < crit_chance:
        data.is_critical = true
        data.amount *= 2.0
    
    return data

Best Practices

最佳实践

Separate Concerns - Health ≠ Combat ≠ Movement
Use Signals - Decouple systems
Area2D for Hitboxes - Built-in collision detection
Invincibility Frames - Prevent spam damage

关注点分离 - 生命值系统 ≠ 战斗系统 ≠ 移动系统
使用信号 - 实现系统解耦
用Area2D实现碰撞箱 - 利用内置的碰撞检测功能
添加无敌帧 - 防止重复 spam 伤害

Reference

参考资料

godot-2d-physics

godot-animation-player

godot-characterbody-2d

godot-combat-system

Original

Translation

Combat System

战斗系统

NEVER Do

绝对禁止的操作

Available Scripts

可用脚本

hitbox_hurtbox.gd

hitbox_hurtbox.gd

Damage System

伤害系统

damage_data.gd

damage_data.gd

Hurtbox/Hitbox Pattern

受击箱/碰撞箱模式

hurtbox.gd

hurtbox.gd

hitbox.gd

hitbox.gd

Health Component

生命值组件

health_component.gd

health_component.gd

Combat State Machine

战斗状态机

combat_state.gd

combat_state.gd

Combo System

连招系统

combo_system.gd

combo_system.gd

Ability System

技能系统

ability.gd

ability.gd

Damage Popups

伤害飘字

damage_popup.gd

damage_popup.gd

Critical Hits

暴击机制

Best Practices

最佳实践

Reference

参考资料

Related

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