Add planet scanner and octopus biome

world/Main.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=46 format=3]
+[gd_scene load_steps=48 format=3]
 [ext_resource type="PackedScene" path="res://ui/menus/BuildMenu.tscn" id="menu_build"]
 [ext_resource type="PackedScene" path="res://ui/menus/HangarMenu.tscn" id="menu_hangar"]
 [ext_resource type="PackedScene" path="res://ui/menus/LabMenu.tscn" id="menu_lab"]
@@ -9,6 +9,7 @@
 [ext_resource type="PackedScene" path="res://ui/menus/GarrisonMenu.tscn" id="menu_garrison"]
 [ext_resource type="PackedScene" path="res://ui/menus/SkillMenu.tscn" id="menu_skill"]
 [ext_resource type="PackedScene" path="res://ui/menus/DevMenu.tscn" id="menu_dev"]
+[ext_resource type="PackedScene" path="res://ui/menus/ScannerMenu.tscn" id="menu_scanner"]
 
 
 [ext_resource type="Script" path="res://world/Starfield.gd" id="1"]
@@ -45,6 +46,7 @@
 [ext_resource type="Script" path="res://ui/SpeedFader.gd" id="31"]
 [ext_resource type="Script" path="res://world/QuestDirector.gd" id="quest_dir"]
 [ext_resource type="Script" path="res://ui/QuestPanel.gd" id="quest_panel"]
+[ext_resource type="Script" path="res://world/OctopusField.gd" id="octopus_field"]
 
 [sub_resource type="ShaderMaterial" id="1"]
 shader = ExtResource("5")
@@ -104,6 +106,9 @@ script = ExtResource("6")
 [node name="AsteroidField" type="Node2D" parent="."]
 script = ExtResource("7")
 
+[node name="OctopusField" type="Node2D" parent="."]
+script = ExtResource("octopus_field")
+
 [node name="PlanetField" type="Node2D" parent="."]
 script = ExtResource("11")
 
@@ -513,6 +518,7 @@ icon = 1
 [node name="GarrisonMenu" parent="UI" instance=ExtResource("menu_garrison")]
 [node name="SkillMenu" parent="UI" instance=ExtResource("menu_skill")]
 [node name="DevMenu" parent="UI" instance=ExtResource("menu_dev")]
+[node name="ScannerMenu" parent="UI" instance=ExtResource("menu_scanner")]
 [node name="QuestPanel" type="Control" parent="UI" groups=["modal_menus"]]
 visible = false
 mouse_filter = 2

world/OctopusField.gd

@@ -0,0 +1,62 @@
+extends Node2D
+
+# A bounded ambient threat attached to the OCTOPUS biome. Like AsteroidField,
+# this node owns only the nearby presentation: the biome itself and its one
+# boss planet remain deterministic WorldGen data.
+
+@export var spawn_interval: float = 2.4
+@export var max_octopuses: int = 7
+@export var spawn_margin: float = 180.0
+@export var retire_distance: float = 2600.0
+
+@onready var fleet: Node2D = get_node("../Fleet")
+
+var octopus_scene: PackedScene = preload("res://boss/BossMinion.tscn")
+var active: Array = []
+var spawn_left: float = 0.0
+var spawn_count: int = 0
+
+
+func _process(delta: float) -> void:
+	active = active.filter(func(o): return is_instance_valid(o))
+	var in_biome: bool = WorldGen.biome_at_chunk(
+		WorldGen.chunk_coords(fleet.get_centroid())) == WorldGen.Biome.OCTOPUS
+	if not in_biome or GameState.intro_active:
+		retire_all()
+		spawn_left = 0.0
+		return
+	for octopus in active.duplicate():
+		if octopus.global_position.distance_to(fleet.get_centroid()) > retire_distance:
+			octopus.retire()
+			active.erase(octopus)
+	spawn_left -= delta
+	if spawn_left <= 0.0 and active.size() < max_octopuses:
+		spawn_one()
+		spawn_left = spawn_interval
+
+
+func spawn_one() -> Node2D:
+	if fleet == null or fleet.ships.is_empty():
+		return null
+	var visible_rect: Rect2 = ViewUtils.get_visible_world_rect(self)
+	var radius: float = maxf(visible_rect.size.length() * 0.5 + spawn_margin,
+		620.0)
+	var angle: float = randf() * TAU
+	var octopus: Node2D = octopus_scene.instantiate()
+	# Ambient hatchlings are sturdy enough to harass a travelling fleet, but
+	# never marked: only the boss encounter's golden hatchlings open eyes.
+	octopus.max_hp = 7
+	octopus.position = fleet.get_centroid() + Vector2.from_angle(angle) * radius
+	get_parent().add_child(octopus)
+	octopus.uses_dash_pattern = spawn_count % 3 == 2
+	octopus.add_to_group("roaming_octopuses")
+	active.append(octopus)
+	spawn_count += 1
+	return octopus
+
+
+func retire_all() -> void:
+	for octopus in active:
+		if is_instance_valid(octopus):
+			octopus.retire()
+	active.clear()

world/Starfield.gd

@@ -15,6 +15,8 @@ extends ColorRect
 
 @onready var camera: Camera2D = get_node("../../Camera2D")
 
+var current_chunk: Vector2i = Vector2i(2147483647, 2147483647)
+
 
 func _process(_delta: float) -> void:
 	var viewport_size: Vector2 = get_viewport_rect().size
@@ -26,3 +28,8 @@ func _process(_delta: float) -> void:
 	material.set_shader_parameter("camera_frac", p - cell)
 	material.set_shader_parameter("camera_zoom", 1.0 / camera.zoom.x)
 	material.set_shader_parameter("viewport_size", viewport_size)
+	var chunk: Vector2i = WorldGen.chunk_coords(camera.global_position)
+	if chunk != current_chunk:
+		current_chunk = chunk
+		material.set_shader_parameter("bg_color",
+			WorldGen.biome_background_color(WorldGen.biome_at_chunk(chunk)))

world/WorldGen.gd

@@ -9,7 +9,7 @@ const PLANET_DEFINITIONS = preload("res://planets/PlanetDefinitions.gd")
 # revisiting the same chunk always yields the same biome, and biomes form
 # smooth multi-chunk regions instead of a per-chunk random checkerboard.
 
-enum Biome { SPACE, ASTEROID_FIELD }
+enum Biome { SPACE, ASTEROID_FIELD, OCTOPUS }
 
 const CHUNK_SIZE: float = 1200.0
 const NOISE_SEED: int = 1337
@@ -37,10 +37,18 @@ const BLACK_HOLE_CHANCE: float = 0.05
 # from 0.08 after playtesting found that rate too scarce for how central
 # research points had become to progression.
 const RESEARCH_LAB_CHANCE: float = 0.16
-# A boss world is rarer than every ordinary discovery. Its roll uses a
-# separately seeded generator below, so adding it cannot rename or re-roll
-# any planet in an existing world.
-const BOSS_PLANET_CHANCE: float = 0.025
+# The hostile region is authored into procedural space as one finite,
+# deterministic island. A probability per chunk can only say "rare"; over an
+# infinite world it inevitably creates infinitely many boss worlds. One
+# anchor and one shape make the actual rule representable: one multi-chunk
+# octopus biome, with its boss at the centre.
+const OCTOPUS_BIOME_CENTER: Vector2i = Vector2i(12, -9)
+const OCTOPUS_BIOME_OFFSETS: Array[Vector2i] = [
+	Vector2i(0, 0), Vector2i(-1, 0), Vector2i(1, 0),
+	Vector2i(0, -1), Vector2i(0, 1),
+	Vector2i(-1, -1), Vector2i(1, -1),
+	Vector2i(-1, 1), Vector2i(1, 1),
+]
 
 # DEV MODE ONLY: one of every planet type, parked in the chunks immediately
 # around the spawn so all five can be reached in seconds.
@@ -113,6 +121,8 @@ static func chunk_origin(chunk: Vector2i) -> Vector2:
 
 
 static func biome_at_chunk(chunk: Vector2i) -> int:
+	if is_octopus_chunk(chunk):
+		return Biome.OCTOPUS
 	var n: float = _get_noise().get_noise_2d(float(chunk.x), float(chunk.y))
 	if n > ASTEROID_FIELD_THRESHOLD:
 		return Biome.ASTEROID_FIELD
@@ -122,6 +132,10 @@ static func biome_at_chunk(chunk: Vector2i) -> int:
 static func has_planet_at_chunk(chunk: Vector2i) -> bool:
 	if _dev_planets_active() and DEV_PLANET_CHUNKS.has(chunk):
 		return true
+	if chunk == OCTOPUS_BIOME_CENTER:
+		return true
+	if is_octopus_chunk(chunk):
+		return false
 	var n: float = _get_planet_noise().get_noise_2d(float(chunk.x), float(chunk.y))
 	return (biome_at_chunk(chunk) == Biome.ASTEROID_FIELD and n > PLANET_THRESHOLD) or (biome_at_chunk(chunk) == Biome.SPACE and n > GAS_GIANT_THRESHOLD)
 
@@ -148,17 +162,12 @@ static func planet_data_at_chunk(chunk: Vector2i) -> Dictionary:
 	var black_hole_roll: float = rng.randf()
 	# Same principle, its own independent roll (#63).
 	var research_lab_roll: float = rng.randf()
-	# Independent from the established generation stream: existing chunks keep
-	# their old names and shapes when this new rare outcome is introduced.
-	var boss_rng := RandomNumberGenerator.new()
-	boss_rng.seed = hash("boss:%d:%d" % [chunk.x, chunk.y])
-	var boss_roll: float = boss_rng.randf()
 	# A stable per-chunk roll makes gas giants persistent landmarks rather
 	# than a different resource whenever the scene reloads.
 	var gas_giant: bool = biome_at_chunk(chunk) == Biome.SPACE
 	var definition_id: String = PLANET_DEFINITIONS.GAS_GIANT_ID if gas_giant else PLANET_DEFINITIONS.ROCKY_ID
 	# Rare authored outcomes, seeded deterministically like everything else.
-	if boss_roll < BOSS_PLANET_CHANCE:
+	if chunk == OCTOPUS_BIOME_CENTER:
 		definition_id = PLANET_DEFINITIONS.BOSS_ID
 	elif black_hole_roll < BLACK_HOLE_CHANCE:
 		definition_id = PLANET_DEFINITIONS.BLACK_HOLE_ID
@@ -186,5 +195,26 @@ static func biome_color(biome: int) -> Color:
 	match biome:
 		Biome.ASTEROID_FIELD:
 			return Color(0.55, 0.36, 0.18, 1.0)
+		Biome.OCTOPUS:
+			return Color(0.34, 0.07, 0.24, 1.0)
 		_:
 			return Color(0.10, 0.13, 0.28, 1.0)
+
+
+static func biome_background_color(biome: int) -> Color:
+	match biome:
+		Biome.OCTOPUS:
+			return Color(0.075, 0.012, 0.065, 1.0)
+		_:
+			return Color(0.02, 0.02, 0.08, 1.0)
+
+
+static func is_octopus_chunk(chunk: Vector2i) -> bool:
+	return chunk - OCTOPUS_BIOME_CENTER in OCTOPUS_BIOME_OFFSETS
+
+
+static func octopus_biome_chunks() -> Array[Vector2i]:
+	var chunks: Array[Vector2i] = []
+	for offset in OCTOPUS_BIOME_OFFSETS:
+		chunks.append(OCTOPUS_BIOME_CENTER + offset)
+	return chunks

world/WorldMap.gd

@@ -58,7 +58,11 @@ func close_map() -> void:
 
 
 func recenter_view() -> void:
-	var fleet_local: Vector2 = fleet.get_centroid() * content.WORLD_TO_LOCAL
+	focus_world_position(fleet.get_centroid())
+
+
+func focus_world_position(world_position: Vector2) -> void:
+	var fleet_local: Vector2 = world_position * content.WORLD_TO_LOCAL
 	var viewport_center: Vector2 = get_viewport_rect().size / 2.0
 	content.position = viewport_center - fleet_local * content.scale.x