finish squig behavior

objects/enemy/squig.gd

@@ -1,13 +1,104 @@
 extends "res://objects/enemy/enemy.gd"
 
+enum State {SWIMMING, FALLING, TRANSITION}
+
+# whether the squid should start in falling state
+export var start_falling: bool = false
 export var speed: float = 50.0
 export var damping: float = 0.9
+export var delay: float = 1.0
+# margin of screen hitbox is disabled in
+export var hitbox_clip: Rect2 = Rect2(0.0, 0.0, 7.0, 7.0)
+export var full_clip: Rect2 = Rect2(-4.0, -4.0, 16.0, 16.0)
+
 
 var velocity: Vector2 = Vector2.ZERO
+# start of the sector it is trapped in
+var home_sector: Vector2 = Vector2.ZERO
+var _can_transition: bool = true
+
+
+onready var current_state: int = State.SWIMMING
+onready var hitbox_shape: CollisionShape2D = $"%HitboxShape"
+onready var animation_player: AnimationPlayer = $AnimationPlayer
+
+
+func _ready() -> void:
+	if start_falling:
+		_start_falling()
+	else:
+		_start_swimming()
+	home_sector = Game.get_sector(global_position)
 
 func _physics_process(delta: float) -> void:
+	if Game.current_sector != home_sector:
+		hitbox_shape.disabled = true
+		return
+	# process movement and apply damping
 	velocity.y *= pow(damping, delta)
+	if current_state == State.FALLING:
+		velocity.y = speed
 	global_position += velocity * delta
+	
+	var sector_rect = Rect2(home_sector * Game.resolution, Game.resolution)
+	
+	# disable hitbox at edge of screen
+	var global_hitbox_clip = hitbox_clip
+	global_hitbox_clip.position += global_position
+	if sector_rect.encloses(global_hitbox_clip):
+		hitbox_shape.disabled = false
+	else:
+		hitbox_shape.disabled = true
+	
+	# check if out of sector
+	var global_full_clip = full_clip
+	global_full_clip.position += global_position
+	if not sector_rect.intersects(global_full_clip) and _can_transition:
+		match current_state:
+			State.SWIMMING:
+				current_state = State.TRANSITION
+				_can_transition = false
+				velocity = Vector2.ZERO
+				var tween = create_tween()
+				tween.tween_interval(delay)
+				tween.tween_callback(self, "_start_falling")
+			State.FALLING:
+				current_state = State.TRANSITION
+				_can_transition = false
+				velocity = Vector2.ZERO
+				var tween = create_tween()
+				tween.tween_interval(delay)
+				tween.tween_callback(self, "_start_swimming")
+			State.TRANSITION:
+				pass
+	
+	# clip to inside of home sector
+	var rid = get_canvas_item()
+	var rect = Rect2(to_local(home_sector * Game.resolution), Game.resolution)
+	VisualServer.canvas_item_set_custom_rect(rid, true, rect)
+	VisualServer.canvas_item_set_clip(rid, true)
 
+
+# give a burst of speed
 func _propel() -> void:
 	velocity.y = -speed
+
+func _start_falling() -> void:
+	if not _can_transition:
+		var player = get_tree().get_nodes_in_group("player").pop_back()
+		if player != null:
+			global_position.x = player.global_position.x
+	animation_player.play("falling")
+	current_state = State.FALLING
+	yield(create_tween().tween_interval(1.0), "finished")
+	_can_transition = true
+
+func _start_swimming() -> void:
+	if not _can_transition:
+		var player = get_tree().get_nodes_in_group("player").pop_back()
+		if player != null:
+			global_position.x = player.global_position.x
+	animation_player.play("swimming")
+	current_state = State.SWIMMING
+	yield(create_tween().tween_interval(1.0), "finished")
+	_can_transition = true