game: add weapon base and sword

scenes/weapons/weapon_sword.gd

@@ -0,0 +1,42 @@
+class_name WeaponSword
+extends WeaponBase
+
+const WEAPON_SWORD_PROJECTILE = preload("res://scenes/weapons/weapon_sword_projectile.tscn")
+
+@onready var targeting_range: Area2D = $TargetingRange
+@onready var targeting_range_shape: CollisionShape2D = $TargetingRange/CollisionShape2D
+
+signal projectile_hit(projectile: WeaponSwordProjectile, enemy: EnemyBase)
+
+var _player: Player
+
+
+func _ready() -> void:
+	targeting_range_shape.shape.radius = attack_range
+	projectile_hit.connect(_on_projectile_hit)
+	_player = get_tree().get_first_node_in_group(GlobalConst.GROUP_PLAYER)
+
+
+func do_attack() -> void:
+	var target: EnemyBase = find_target_in_radius()
+	if not target:
+		return
+
+	var projectile = WEAPON_SWORD_PROJECTILE.instantiate()
+	projectile.damage = attack_damage
+	projectile.target = target
+	projectile.on_hit_sig = projectile_hit
+	add_child(projectile)
+
+
+func deal_damage(enemy: EnemyBase):
+	var crit_chance = _player.player_stats.get_final("crit_chance", _player.modifiers)
+	var damage_dealt = attack_damage
+	var is_crit = randf() >= 1 - crit_chance
+	if is_crit:
+		damage_dealt *= _player.player_stats.get_final("crit_multiplier", _player.modifiers)
+	enemy.take_damage(damage_dealt, is_crit)
+
+
+func _on_projectile_hit(projectile: WeaponSwordProjectile, enemy: EnemyBase):
+	deal_damage(enemy)