Add tentacled boss planet encounter

boss/BossMinion.gd

@@ -0,0 +1,96 @@
+class_name BossMinion
+extends Area2D
+
+signal destroyed
+
+const COMBAT_TARGET = preload("res://core/CombatTarget.gd")
+
+@export var marked: bool = false
+@export var max_hp: int = 2
+@export var speed: float = 245.0
+@export var acceleration: float = 520.0
+
+var boss: Node2D
+var hp: int = 2
+var velocity: Vector2 = Vector2.ZERO
+var phase: float = 0.0
+var dead: bool = false
+
+
+func _ready() -> void:
+	hp = max_hp
+	add_to_group("enemies")
+	add_to_group("boss_minions")
+	COMBAT_TARGET.register(self, COMBAT_TARGET.DANGER_PRIORITY)
+	phase = randf() * TAU
+	queue_redraw()
+
+
+func _physics_process(delta: float) -> void:
+	phase += delta
+	var fleet: Node2D = get_tree().get_first_node_in_group("player_fleet")
+	if fleet != null and not fleet.ships.is_empty():
+		var to_fleet: Vector2 = fleet.get_centroid() - global_position
+		if to_fleet.length() > 1.0:
+			velocity = velocity.move_toward(to_fleet.normalized() * speed,
+				acceleration * delta)
+			global_position += velocity * delta
+			if velocity.length() > 4.0:
+				rotation = lerp_angle(rotation, velocity.angle() + PI / 2.0,
+					7.0 * delta)
+	queue_redraw()
+
+
+func take_damage(amount: int) -> bool:
+	if dead:
+		return false
+	hp -= maxi(amount, 1)
+	if hp > 0:
+		return false
+	_die(true)
+	return true
+
+
+func collide_with_player_vessel() -> void:
+	_die(false)
+
+
+func retire() -> void:
+	if dead:
+		return
+	dead = true
+	hp = 0
+	destroyed.emit()
+	queue_free()
+
+
+func _die(killed_by_player: bool) -> void:
+	if dead:
+		return
+	dead = true
+	hp = 0
+	if killed_by_player and marked and is_instance_valid(boss):
+		boss.accept_marked_kill(global_position)
+	EnemyExplosionVFX.spawn(get_tree().root, global_position)
+	Sfx.play(get_tree(), Sfx.ENEMY_DEATH)
+	destroyed.emit()
+	queue_free()
+
+
+func _draw() -> void:
+	var glow := Color(1.0, 0.78, 0.18) if marked else Color(0.9, 0.16, 0.58)
+	var core := Color(0.13, 0.01, 0.09)
+	# A small bulb with four streaming arms: recognisably related to the boss,
+	# but compact enough to read among an entire wave.
+	draw_set_transform(Vector2.ZERO, 0.0, Vector2(1.0, 0.76))
+	NeonDraw.draw_glowing_circle(self, Vector2(0, -7), 13.0, glow, 1.0, core)
+	draw_set_transform(Vector2.ZERO, 0.0, Vector2.ONE)
+	for i in range(4):
+		var x: float = -12.0 + float(i) * 8.0
+		var curl: float = sin(phase * 5.0 + float(i)) * 5.0
+		NeonDraw.draw_glowing_path(self, PackedVector2Array([
+			Vector2(x, 1), Vector2(x + curl * 0.35, 10), Vector2(x + curl, 21),
+		]), glow, 0.85, 0.35, core)
+	if marked:
+		NeonDraw.draw_glowing_circle(self, Vector2(0, -8), 4.0,
+			Color.WHITE, 1.0, core)