Add tentacled boss planet encounter

boss/OctopusBoss.gd

@@ -0,0 +1,213 @@
+class_name OctopusBoss
+extends Node2D
+
+signal phase_changed(phase: int)
+signal defeated
+
+const EYE_SCENE: PackedScene = preload("res://boss/BossEye.tscn")
+const MINION_SCENE: PackedScene = preload("res://boss/BossMinion.tscn")
+const RETURN_SCENE: PackedScene = preload("res://boss/BossReturnSignal.tscn")
+const LASER_SCENE: PackedScene = preload("res://enemies/EnemyBigLaserBeam.tscn")
+
+enum Phase { MINION_WAVES, LASER_STORM, DEFEATED }
+
+const EYE_COUNT: int = 6
+const PHASE_TWO_EYES: int = 3
+const BODY_RADIUS: float = 86.0
+const TENTACLE_LENGTH: float = 235.0
+
+@export var first_wave_delay: float = 1.5
+@export var wave_interval: float = 6.0
+@export var minions_per_wave: int = 5
+@export var laser_interval: float = 5.5
+@export var laser_charge_time: float = 1.6
+@export var laser_range: float = 1500.0
+
+var phase: int = Phase.MINION_WAVES
+var wave_timer: float = 0.0
+var laser_timer: float = 0.0
+var wave_index: int = 0
+var eyes: Array = []
+var eyes_opened: int = 0
+var eyes_destroyed: int = 0
+var spawned_minions: Array = []
+var return_signals: Array = []
+var animation_phase: float = 0.0
+
+
+func _ready() -> void:
+	add_to_group("bosses")
+	wave_timer = first_wave_delay
+	laser_timer = laser_interval
+	_build_eyes()
+	queue_redraw()
+
+
+func _build_eyes() -> void:
+	for i in range(EYE_COUNT):
+		var eye: Area2D = EYE_SCENE.instantiate()
+		eye.position = eye_position(i)
+		eye.rotation = eye.position.angle()
+		add_child(eye)
+		eye.destroyed.connect(_on_eye_destroyed.bind(i))
+		eyes.append(eye)
+
+
+func eye_position(index: int) -> Vector2:
+	var angle: float = -PI / 2.0 + TAU * float(index) / float(EYE_COUNT)
+	# Alternating reach keeps the silhouette organic without randomising the
+	# actual weak-point layout between attempts.
+	var reach: float = TENTACLE_LENGTH * (0.88 if index % 2 == 0 else 1.0)
+	return Vector2.from_angle(angle) * reach
+
+
+func _process(delta: float) -> void:
+	if phase == Phase.DEFEATED:
+		return
+	animation_phase += delta
+	spawned_minions = spawned_minions.filter(func(node): return is_instance_valid(node))
+	return_signals = return_signals.filter(func(node): return is_instance_valid(node))
+
+	wave_timer -= delta
+	if wave_timer <= 0.0:
+		spawn_wave()
+		wave_timer = wave_interval * (1.25 if phase == Phase.LASER_STORM else 1.0)
+
+	if phase == Phase.LASER_STORM:
+		laser_timer -= delta
+		if laser_timer <= 0.0:
+			fire_laser_volley()
+			laser_timer = laser_interval
+	queue_redraw()
+
+
+func spawn_wave() -> void:
+	var fleet: Node2D = get_tree().get_first_node_in_group("player_fleet")
+	if fleet == null or fleet.ships.is_empty() or get_parent() == null:
+		return
+	var count: int = maxi(3, minions_per_wave - (2 if phase == Phase.LASER_STORM else 0))
+	var marked_slot: int = wave_index % count
+	for i in range(count):
+		var minion: Area2D = MINION_SCENE.instantiate()
+		minion.marked = i == marked_slot
+		minion.boss = self
+		get_parent().add_child(minion)
+		var angle: float = TAU * float(i) / float(count) + float(wave_index) * 0.47
+		# Minions are siblings rather than boss children, so account for the
+		# encounter scene's imposing boss scale when placing them off its body.
+		var launch_radius: float = BODY_RADIUS * scale.x + 34.0
+		minion.global_position = global_position + Vector2.from_angle(angle) * launch_radius
+		spawned_minions.append(minion)
+	wave_index += 1
+
+
+func accept_marked_kill(from: Vector2) -> void:
+	if phase == Phase.DEFEATED or get_parent() == null:
+		return
+	var returning: Node2D = RETURN_SCENE.instantiate()
+	returning.target = self
+	get_parent().add_child(returning)
+	returning.global_position = from
+	return_signals.append(returning)
+
+
+func open_next_eye() -> bool:
+	if phase == Phase.DEFEATED:
+		return false
+	for eye in eyes:
+		if is_instance_valid(eye) and not bool(eye.opened):
+			eye.open_eye()
+			eyes_opened += 1
+			return true
+	return false
+
+
+func _on_eye_destroyed(_index: int) -> void:
+	eyes_destroyed += 1
+	if eyes_destroyed >= EYE_COUNT:
+		_defeat()
+		return
+	if phase == Phase.MINION_WAVES and eyes_destroyed >= PHASE_TWO_EYES:
+		phase = Phase.LASER_STORM
+		laser_timer = 0.35
+		phase_changed.emit(phase)
+	queue_redraw()
+
+
+func fire_laser_volley() -> void:
+	if phase != Phase.LASER_STORM:
+		return
+	var fleet: Node2D = get_tree().get_first_node_in_group("player_fleet")
+	if fleet == null or fleet.ships.is_empty():
+		return
+	var toward: Vector2 = fleet.get_centroid() - global_position
+	if toward.length() < 1.0:
+		return
+	# Three locked, dodgeable lanes form the second phase's distinct pattern.
+	for spread in [-0.17, 0.0, 0.17]:
+		var beam: Node2D = LASER_SCENE.instantiate()
+		beam.charge_time = laser_charge_time
+		beam.beam_range = laser_range
+		beam.beam_half_width = 24.0
+		beam.damage = 1
+		beam.color = Color(1.0, 0.12, 0.58)
+		get_tree().root.add_child(beam)
+		beam.add_to_group("boss_lasers")
+		beam.launch(global_position, toward.rotated(float(spread)))
+
+
+func _defeat() -> void:
+	if phase == Phase.DEFEATED:
+		return
+	phase = Phase.DEFEATED
+	for minion in spawned_minions:
+		if is_instance_valid(minion):
+			minion.retire()
+	for returning in return_signals:
+		if is_instance_valid(returning):
+			returning.queue_free()
+	EnemyExplosionVFX.spawn(get_tree().root, global_position)
+	Sfx.play(get_tree(), Sfx.ENEMY_DEATH)
+	visible = false
+	phase_changed.emit(phase)
+	defeated.emit()
+
+
+func suppress_as_defeated() -> void:
+	phase = Phase.DEFEATED
+	visible = false
+	set_process(false)
+
+
+func _draw() -> void:
+	if phase == Phase.DEFEATED:
+		return
+	var flesh := Color(0.95, 0.18, 0.58)
+	var phase_color := Color(1.0, 0.1, 0.32) if phase == Phase.LASER_STORM \
+		else flesh
+	var dark := Color(0.075, 0.004, 0.05)
+	for i in range(EYE_COUNT):
+		var end: Vector2 = eye_position(i)
+		var angle: float = end.angle()
+		var side := Vector2.from_angle(angle + PI / 2.0)
+		var points := PackedVector2Array()
+		for step in range(9):
+			var t: float = float(step) / 8.0
+			var sway: float = sin(animation_phase * 1.7 + float(i) * 1.4 + t * PI * 2.0)
+			points.append(end * t + side * sway * 18.0 * sin(t * PI))
+		NeonDraw.draw_glowing_path(self, points, phase_color, 0.8, 0.8, dark)
+
+	var body := PackedVector2Array()
+	for i in range(28):
+		var angle: float = TAU * float(i) / 28.0
+		var pulse: float = 1.0 + 0.045 * sin(animation_phase * 2.4 + float(i) * 1.9)
+		body.append(Vector2.from_angle(angle) * BODY_RADIUS * pulse)
+	NeonDraw.draw_glowing_polygon(self, body, phase_color, 0.92, dark)
+	# The central eye watches but is armoured; only tentacle eyes opened by a
+	# returning marked minion join the combat-target group.
+	draw_set_transform(Vector2.ZERO, 0.0, Vector2(0.72, 1.0))
+	NeonDraw.draw_glowing_circle(self, Vector2.ZERO, 31.0,
+		Color(0.28, 0.92, 1.0), 0.8 + 0.2 * sin(animation_phase * 3.0), dark)
+	NeonDraw.draw_glowing_circle(self, Vector2.ZERO, 12.0,
+		Color(1.0, 0.82, 0.2), 1.0, dark)
+	draw_set_transform(Vector2.ZERO, 0.0, Vector2.ONE)