ft: nucleotide prey FSM

evolve-die-repeat/molecular/molecular_player.gd

@@ -63,7 +63,7 @@ func _on_attack_hit(body: Node2D) -> void:
 	var hit_hittable = false
 	if body.is_in_group("prey") or body.is_in_group("predators"):
 		if body.has_method("handle_damage"):
-			body.handle_damage(damage)
+			body.handle_damage(damage, self)
 			hit_hittable = true
 	elif body.is_in_group("resources"):
 		pass

evolve-die-repeat/molecular/molecular_stage.tscn

@@ -5,7 +5,7 @@
 [ext_resource type="Texture2D" uid="uid://c3cuhrmulyy1s" path="res://molecular/assets/background/bg-near.png" id="4_b1jr0"]
 [ext_resource type="Script" uid="uid://ceut2lrvkns75" path="res://debug_label.gd" id="4_mys4o"]
 [ext_resource type="Script" uid="uid://umx4w11edif" path="res://molecular/prey_manager.gd" id="5_cthuy"]
-[ext_resource type="PackedScene" uid="uid://c3iw2v3x6ngrb" path="res://molecular/nucleotide_prey.tscn" id="6_a5cls"]
+[ext_resource type="PackedScene" uid="uid://c3iw2v3x6ngrb" path="res://molecular/prey/nucleotide_prey.tscn" id="6_a5cls"]
 
 [sub_resource type="TileMapPattern" id="TileMapPattern_a5cls"]
 tile_data = PackedInt32Array(0, 65536, 2, 65536, 65536, 3, 1, 131072, 2, 65537, 131072, 3)
@@ -108,9 +108,8 @@ text = "Debug: You made it into the game!
 This is running from C++:                         "
 script = ExtResource("4_mys4o")
 
-[node name="PreyManager" type="Node" parent="." node_paths=PackedStringArray("cam")]
+[node name="PreyManager" type="Node" parent="."]
 script = ExtResource("5_cthuy")
-cam = NodePath("../player/Camera2D")
 scene = ExtResource("6_a5cls")
 minCount = 100
 maxCount = 300

evolve-die-repeat/molecular/nucleotide_prey_foraging.gd

@@ -1,17 +0,0 @@
-extends NucleotidePreyState
-
-@onready var timer = $Timer
-var dir: float = 0.0
-
-func enter(previous_state_path: String, data := {}) -> void:
-	timer.start(randi() % 5)
-	dir = randi() % 360
-
-func physics_update(_delta: float) -> void:
-	# TODO: move in direction of dir
-	pass
-
-
-func _on_timer_timeout() -> void:
-	dir = randi() % 360
-	timer.start(randi() % 5)

evolve-die-repeat/molecular/nucleotide_prey_state.gd

@@ -1,6 +0,0 @@
-class_name NucleotidePreyState extends State
-
-enum State {IDLE, FORAGING, FEEDING, FLEEING}
-
-func _ready() -> void:
-	await owner.ready

evolve-die-repeat/molecular/nucleotide_prey_state.gd.uid

@@ -1 +0,0 @@
-uid://c7o7sp02u0wkv

evolve-die-repeat/molecular/prey/nucleotide_prey.gd

@@ -1,6 +1,7 @@
 extends AbstractPrey2D
 
 @onready var sprite = get_node("AnimatedSprite2D")
+@onready var fsm = $StateMachine
 
 # Mirroed sprites for periodic boundary
 var mirrorSprite1: Node2D
@@ -29,6 +30,7 @@ func _process(delta: float) -> void:
 
 func _physics_process(delta: float) -> void:
 	#self.move(Vector3(randfn(0, 1), randfn(0, 1), 0))
+	# TODO: state transition logic (bot controller code)
 	pass
 
 func move(motion: Vector3) -> void:
@@ -37,12 +39,13 @@ func move(motion: Vector3) -> void:
 	# Apply boundary to new position
 	position = GameManager.get_boundaried_position(position)
 
-func handle_damage(dmg: int) -> void:
+func handle_damage(dmg: int, src: Node) -> void:
 	health = max(0, health-dmg)
 	if health == 0:
 		die()
 	if health < maxHealth:
 		become_injured()
+	fsm.transition_to_next_state(fsm.States.FLEEING, {"threat": src})
 	
 func die() -> void:
 	sprite.play("Dying")
@@ -143,3 +146,7 @@ func _handle_wrapping():
 		mirrorSprite3.position = Vector2(0,  - GameManager.screen_size.y)
 
 	
+
+
+func _on_timer_timeout() -> void:
+	pass # Replace with function body.

evolve-die-repeat/molecular/prey/nucleotide_prey.tscn

@@ -1,15 +1,17 @@
-[gd_scene load_steps=12 format=3 uid="uid://c3iw2v3x6ngrb"]
+[gd_scene load_steps=14 format=3 uid="uid://c3iw2v3x6ngrb"]
 
 [ext_resource type="PackedScene" uid="uid://bvsdg1v3ksixy" path="res://shared/npc/prey2D.tscn" id="1_qvulj"]
-[ext_resource type="Script" uid="uid://bgossk6xo31gi" path="res://molecular/nucleotide_prey.gd" id="2_0227s"]
+[ext_resource type="Script" uid="uid://bgossk6xo31gi" path="res://molecular/prey/nucleotide_prey.gd" id="2_0227s"]
 [ext_resource type="Texture2D" uid="uid://bhcb5g7g7um8" path="res://molecular/assets/prey/prey-dying-frame0.png" id="2_lkj7f"]
 [ext_resource type="Texture2D" uid="uid://bxn11avw7dykl" path="res://molecular/assets/prey/prey-dying-frame1.png" id="3_svqyr"]
 [ext_resource type="Texture2D" uid="uid://ctkehsavw6ghx" path="res://molecular/assets/prey/prey-healthy-frame0.png" id="4_ee1gb"]
 [ext_resource type="Texture2D" uid="uid://uy28y3mkk6nt" path="res://molecular/assets/prey/prey-healthy-frame1.png" id="5_ae5nf"]
 [ext_resource type="Texture2D" uid="uid://btnyajci8ptb2" path="res://molecular/assets/prey/prey-injured-frame0.png" id="6_0f87h"]
 [ext_resource type="Texture2D" uid="uid://bqll8ge4cr2uf" path="res://molecular/assets/prey/prey-injured-frame1.png" id="7_w7inl"]
-[ext_resource type="Script" uid="uid://c7o7sp02u0wkv" path="res://molecular/nucleotide_prey_state.gd" id="9_guu3v"]
+[ext_resource type="Script" uid="uid://0vwv2nt16gpv" path="res://molecular/prey/nucleotide_prey_state_machine.gd" id="9_xxtgy"]
-[ext_resource type="Script" uid="uid://ubcu8fdfxxj1" path="res://molecular/nucleotide_prey_foraging.gd" id="10_rgguv"]
+[ext_resource type="Script" uid="uid://ubcu8fdfxxj1" path="res://molecular/prey/nucleotide_prey_random_movement.gd" id="10_rgguv"]
+[ext_resource type="Script" uid="uid://xbiqj7ubmj7d" path="res://molecular/prey/nucleotide_prey_idle.gd" id="12_ubfhk"]
+[ext_resource type="Script" uid="uid://dlw7inlh6asvu" path="res://molecular/prey/nucleotide_prey_fleeing.gd" id="12_xxtgy"]
 
 [sub_resource type="SpriteFrames" id="SpriteFrames_66x8p"]
 animations = [{
@@ -58,15 +60,26 @@ scale = Vector2(0.1, 0.1)
 sprite_frames = SubResource("SpriteFrames_66x8p")
 animation = &"Injured"
 
-[node name="State" type="Node" parent="." index="2"]
+[node name="StateMachine" type="Node" parent="." index="2" node_paths=PackedStringArray("initial_state")]
-script = ExtResource("9_guu3v")
+script = ExtResource("9_xxtgy")
-metadata/_custom_type_script = "uid://co2xp7gauamql"
+initial_state = NodePath("Idle")
+metadata/_custom_type_script = "uid://ck7k8ht54snsy"
 
-[node name="Foraging" type="Node" parent="State" index="0"]
+[node name="RandomMovement" type="Node" parent="StateMachine" index="0"]
 script = ExtResource("10_rgguv")
-metadata/_custom_type_script = "uid://c7o7sp02u0wkv"
 
-[node name="Timer" type="Timer" parent="State/Foraging" index="0"]
+[node name="Timer" type="Timer" parent="StateMachine/RandomMovement" index="0"]
 one_shot = true
 
-[connection signal="timeout" from="State/Foraging/Timer" to="State/Foraging" method="_on_timer_timeout"]
+[node name="Fleeing" type="Node" parent="StateMachine" index="1"]
+script = ExtResource("12_xxtgy")
+
+[node name="Idle" type="Node" parent="StateMachine" index="2"]
+script = ExtResource("12_ubfhk")
+metadata/_custom_type_script = "uid://co2xp7gauamql"
+
+[node name="Timer" type="Timer" parent="StateMachine/Idle" index="0"]
+one_shot = true
+
+[connection signal="timeout" from="StateMachine/RandomMovement/Timer" to="StateMachine/RandomMovement" method="_on_timer_timeout"]
+[connection signal="timeout" from="StateMachine/Idle/Timer" to="StateMachine/Idle" method="_on_timer_timeout"]

evolve-die-repeat/molecular/prey/nucleotide_prey_fleeing.gd

@@ -0,0 +1,22 @@
+extends State
+
+var threat: Node2D
+var threshold: float = 100
+
+func enter(previous_state_path: String, data := {}) -> void:
+	if data.has("threat"):
+		threat = data["threat"]
+	else:
+		# default behaviour; do nothing
+		threat = owner
+
+func physics_update(_delta: float) -> void:
+	if owner.position.distance_to(threat.position) > threshold:
+		finished.emit(owner.fsm.States.IDLE, {}) 
+		return
+	owner.move(flee_from(threat.position))
+
+func flee_from(pos: Vector2) -> Vector3:
+	var diff = threat.position - owner.position
+	diff = diff.normalized() * -1
+	return Vector3(diff.x, diff.y ,0)	

evolve-die-repeat/molecular/prey/nucleotide_prey_fleeing.gd.uid

@@ -0,0 +1 @@
+uid://dlw7inlh6asvu

evolve-die-repeat/molecular/prey/nucleotide_prey_idle.gd

@@ -0,0 +1,19 @@
+extends State
+
+@onready var timer = $Timer
+
+
+func enter(previous_state_path: String, data := {}) -> void:
+	timer.start((float)(randi() % 5)/5)
+
+func physics_update(_delta: float) -> void:
+	owner.move(Vector3(randfn(0, 1), randfn(0, 1), 0))
+
+func _on_timer_timeout() -> void:
+	if (randi() % 4 != 0):
+		finished.emit(owner.fsm.States.RANDOMMOVEMENT, {})
+	else:
+		finished.emit(owner.fsm.States.IDLE, {})
+
+func exit() -> void:
+	timer.stop()

evolve-die-repeat/molecular/prey/nucleotide_prey_idle.gd.uid

@@ -0,0 +1 @@
+uid://xbiqj7ubmj7d

evolve-die-repeat/molecular/prey/nucleotide_prey_random_movement.gd

@@ -0,0 +1,20 @@
+extends State
+
+@onready var timer = $Timer
+var dir: Vector3 = Vector3(0,0,0);
+
+func enter(previous_state_path: String, data := {}) -> void:
+	timer.start((float)(randi() % 10)/20)
+	dir = calc_dir(randi() % 360)
+
+func physics_update(_delta: float) -> void:
+	owner.move(dir)
+
+func calc_dir(angle: float) -> Vector3:
+	return Vector3(cos(angle), sin(angle), 0)	
+	
+func _on_timer_timeout() -> void:
+	finished.emit(owner.fsm.States.IDLE, {})
+
+func exit() -> void:
+	timer.stop()

evolve-die-repeat/molecular/prey/nucleotide_prey_state_machine.gd

@@ -0,0 +1,17 @@
+extends StateMachine
+
+enum States {IDLE, RANDOMMOVEMENT, FEEDING, FLEEING}
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	super()
+	await owner.ready
+
+
+func transition_to_next_state(target: int, data: Dictionary = {}) -> void:
+	match target:
+		States.IDLE: _transition_to_next_state("Idle", data)
+		States.RANDOMMOVEMENT: _transition_to_next_state("RandomMovement", data)
+		States.FEEDING: _transition_to_next_state("Feeding", data)
+		States.FLEEING: _transition_to_next_state("Fleeing", data)
+		_: push_error("Trying to transition to unknown state {target}")

evolve-die-repeat/molecular/prey/nucleotide_prey_state_machine.gd.uid

@@ -0,0 +1 @@
+uid://0vwv2nt16gpv

evolve-die-repeat/shared/npc/prey2D.gd

@@ -1,9 +1,6 @@
 extends NPC2D
 class_name AbstractPrey2D
 
-enum States {IDLE, FORAGING, FLEEING}
-var state = States.IDLE
-
 
 # Called when the node enters the scene tree for the first time.
 func _ready() -> void:

evolve-die-repeat/shared/state_machine.gd

@@ -10,7 +10,7 @@ class_name StateMachine extends Node
 # Connect states on ready, then wait.
 func _ready() -> void:
 	for node: State in find_children("*", "State"):
-		node.finished.connect(_transition_to_next_state)
+		node.finished.connect(transition_to_next_state)
 
 	await owner.ready
 	state.enter("")
@@ -37,3 +37,6 @@ func _transition_to_next_state(target_path: String, data: Dictionary = {}) -> vo
 	state.exit()
 	state = get_node(target_path)
 	state.enter(previous_state_path, data)
+
+func transition_to_next_state(target: int, data: Dictionary = {}) -> void:
+	push_error("Child FSM failed to implement transition function.")