simple bot navigation

addons/nezvers_library/static/GameMath/GameMath.gd

@@ -38,6 +38,17 @@ static func dist_to_line_3d(pos:Vector3, line_start:Vector3, line_end:Vector3)->
 		return bv.length()
 	return ab.cross(ac).length() / ab.length()
 
+static func get_closest_node_2d(point:Vector2, body_list:Array[Node2D])->Node2D:
+	if body_list.is_empty():
+		return null
+	var closest:Node2D = body_list.front()
+	var dist:float = (closest.global_position - point).length_squared()
+	for body:Node2D in body_list:
+		var _dist:float = (body.global_position - point).length_squared()
+		if _dist < dist:
+			dist = _dist
+			closest = body
+	return closest
 
 ## Outline of the formula
 static func dampened_spring(displacement, damp, velocity, spring:float, delta:float):

scenes/actors/ai/enemy_ai.tscn

@@ -0,0 +1,51 @@
+[gd_scene load_steps=7 format=3 uid="uid://cenq1bawfywu8"]
+
+[ext_resource type="Script" path="res://scripts/actor/bots/BotInput.gd" id="1_qo7hy"]
+[ext_resource type="Script" path="res://scripts/actor/bots/NavigationVisualizer2D.gd" id="2_2yt0t"]
+[ext_resource type="Script" path="res://scripts/actor/bots/ProximityAttack.gd" id="3_4n00q"]
+[ext_resource type="Script" path="res://scripts/actor/bots/TargetFinder.gd" id="4_y3qb6"]
+[ext_resource type="Script" path="res://scripts/actor/bots/TargetDirection.gd" id="5_ekfo4"]
+
+[sub_resource type="RectangleShape2D" id="RectangleShape2D_ixqjj"]
+size = Vector2(1000, 500)
+
+[node name="EnemyAi" type="Node2D"]
+script = ExtResource("1_qo7hy")
+
+[node name="Area2D" type="Area2D" parent="."]
+collision_layer = 0
+collision_mask = 2
+monitorable = false
+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="Area2D"]
+shape = SubResource("RectangleShape2D_ixqjj")
+debug_color = Color(0, 0.6, 0.701961, 0)
+
+[node name="RayCast2D" type="RayCast2D" parent="."]
+enabled = false
+
+[node name="NavigationAgent2D" type="NavigationAgent2D" parent="."]
+path_desired_distance = 5.0
+radius = 16.0
+
+[node name="NavigationVisualizer" type="Line2D" parent="NavigationAgent2D" node_paths=PackedStringArray("navigation_agent")]
+width = 1.0
+script = ExtResource("2_2yt0t")
+navigation_agent = NodePath("..")
+
+[node name="TargetFinder" type="Node" parent="." node_paths=PackedStringArray("area", "bot_input")]
+script = ExtResource("4_y3qb6")
+area = NodePath("../Area2D")
+bot_input = NodePath("..")
+
+[node name="ProximityAttack" type="Node" parent="." node_paths=PackedStringArray("target_finder", "bot_input")]
+script = ExtResource("3_4n00q")
+target_finder = NodePath("../TargetFinder")
+bot_input = NodePath("..")
+
+[node name="TargetDirection" type="Node" parent="." node_paths=PackedStringArray("target_finder", "bot_input", "raycast", "navigation_agent")]
+script = ExtResource("5_ekfo4")
+target_finder = NodePath("../TargetFinder")
+bot_input = NodePath("..")
+raycast = NodePath("../RayCast2D")
+navigation_agent = NodePath("../NavigationAgent2D")

scenes/actors/zombie.tscn

@@ -1,18 +1,17 @@
-[gd_scene load_steps=20 format=3 uid="uid://62j3fy0o3uwl"]
+[gd_scene load_steps=18 format=3 uid="uid://62j3fy0o3uwl"]
 
 [ext_resource type="PackedScene" uid="uid://botai66n8rwt3" path="res://scenes/actors/actor.tscn" id="1_fkm2k"]
 [ext_resource type="Shader" path="res://scripts/shaders/color_flash.gdshader" id="2_duvie"]
 [ext_resource type="Texture2D" uid="uid://dqqfb3tyiyk2v" path="res://assets/images/characters/zombie_16x16_strip8.png" id="2_giu7j"]
-[ext_resource type="Script" path="res://scripts/actor/ZombieInput.gd" id="2_yis6g"]
 [ext_resource type="Resource" uid="uid://k6kulmw3ddq8" path="res://resources/health_resource/zombie_health.tres" id="2_ysqwl"]
 [ext_resource type="Resource" uid="uid://bgj1j2b6mc1u7" path="res://resources/ActorStatsResource/zombie_stats.tres" id="5_srg4e"]
 [ext_resource type="Resource" uid="uid://dq8mhmimpehoi" path="res://resources/InputResource/zombie_input_resource.tres" id="6_o1vf4"]
 [ext_resource type="PackedScene" uid="uid://baisjmcsnk3on" path="res://scenes/weapons/zombie_attack.tscn" id="7_tyqu3"]
 [ext_resource type="Resource" uid="uid://bmurrqosq7bec" path="res://resources/sounds/kill_zombie.tres" id="7_uiw1f"]
 [ext_resource type="Script" path="res://scripts/actor/AddPoint.gd" id="9_3rsmj"]
 [ext_resource type="PackedScene" uid="uid://bu2n5cvym7bse" path="res://scenes/vfx/zombie_body.tscn" id="9_3xjhw"]
+[ext_resource type="PackedScene" uid="uid://cenq1bawfywu8" path="res://scenes/actors/ai/enemy_ai.tscn" id="9_4t8nd"]
 [ext_resource type="Resource" uid="uid://5emqdks7qgbm" path="res://resources/score_resource.tres" id="10_3mlgp"]
-[ext_resource type="Script" path="res://scripts/actor/bots/NavigationVisualizer2D.gd" id="10_ouyos"]
 
 [sub_resource type="ShaderMaterial" id="ShaderMaterial_mtjxa"]
 resource_local_to_scene = true
@@ -100,9 +99,6 @@ _data = {
 "walk": SubResource("Animation_d7gcn")
 }
 
-[sub_resource type="RectangleShape2D" id="RectangleShape2D_ixqjj"]
-size = Vector2(1000, 500)
-
 [node name="Zombie" instance=ExtResource("1_fkm2k")]
 collision_layer = 4
 collision_mask = 7
@@ -128,33 +124,14 @@ input_resource = ExtResource("6_o1vf4")
 sound_resource_dead = ExtResource("7_uiw1f")
 dead_vfx_scene = ExtResource("9_3xjhw")
 
-[node name="PlayerDetector" type="Area2D" parent="." index="8"]
-
-[node name="CollisionShape2D" type="CollisionShape2D" parent="PlayerDetector" index="0"]
-shape = SubResource("RectangleShape2D_ixqjj")
-debug_color = Color(0, 0.6, 0.701961, 0)
-
-[node name="ZombieInput" type="Node2D" parent="." index="9" node_paths=PackedStringArray("mover", "player_detector", "weapon")]
-script = ExtResource("2_yis6g")
+[node name="ZombieInput" parent="." index="8" node_paths=PackedStringArray("mover") instance=ExtResource("9_4t8nd")]
 mover = NodePath("../MoverTopDown2D")
-player_detector = NodePath("../PlayerDetector")
-minimal_distance = Vector2(12, 6)
-weapon = NodePath("../SlashAttack")
-
-[node name="RayCast2D" type="RayCast2D" parent="ZombieInput" index="0"]
-enabled = false
-
-[node name="NavigationAgent2D" type="NavigationAgent2D" parent="ZombieInput" index="1"]
-
-[node name="NavigationVisualizer" type="Line2D" parent="ZombieInput/NavigationAgent2D" index="0" node_paths=PackedStringArray("navigation_agent")]
-script = ExtResource("10_ouyos")
-navigation_agent = NodePath("..")
 
-[node name="SlashAttack" parent="." index="10" node_paths=PackedStringArray("mover") instance=ExtResource("7_tyqu3")]
+[node name="SlashAttack" parent="." index="9" node_paths=PackedStringArray("mover") instance=ExtResource("7_tyqu3")]
 collision_mask = 2
 mover = NodePath("../MoverTopDown2D")
 
-[node name="AddPoint" type="Node" parent="." index="11" node_paths=PackedStringArray("damage_receiver")]
+[node name="AddPoint" type="Node" parent="." index="10" node_paths=PackedStringArray("damage_receiver")]
 script = ExtResource("9_3rsmj")
 damage_receiver = NodePath("../DamageReceiver")
 score_resource = ExtResource("10_3mlgp")

scripts/actor/bots/BotInput.gd

@@ -0,0 +1,29 @@
+class_name BotInput
+extends Node2D
+
+signal input_update
+
+@export var enabled:bool = true
+## Commands the movement
+@export var mover:MoverTopDown2D
+
+var axis_compensation:Vector2 # top down movement can use different speed for X&Y axis
+
+## Not using automatic setter functions because they are called before _ready during initialization
+func _ready()->void:
+	# Set to run before mover
+	process_physics_priority -= 1
+	axis_compensation = Vector2.ONE/mover.axis_multiplier
+	set_enabled(enabled)
+
+## Toggle processing for animation state machine
+func set_enabled(value:bool)->void:
+	enabled = value
+	set_physics_process(enabled)
+	if !enabled:
+		mover.input_resource.axis = Vector2.ZERO
+
+## Inputs need to be manipulated here
+## Modules use this to time their functions
+func _physics_process(_delta:float)->void:
+	input_update.emit()

scripts/actor/bots/ProximityAttack.gd

@@ -0,0 +1,16 @@
+class_name ProximityAttack
+extends Node
+
+@export var attack_range:float = 16.0
+@export var target_finder:TargetFinder
+@export var bot_input:BotInput
+
+func _ready()->void:
+	target_finder.target_update.connect(on_target_update)
+
+func on_target_update()->void:
+	if target_finder.closest == null:
+		bot_input.mover.input_resource.set_action(false)
+		return
+	var distance:float = (target_finder.closest.global_position - bot_input.global_position).length()
+	bot_input.mover.input_resource.set_action(distance <= attack_range)

scripts/actor/bots/TargetDirection.gd

@@ -0,0 +1,40 @@
+class_name TargetDirection
+extends Node
+
+@export var target_finder:TargetFinder
+@export var bot_input:BotInput
+@export var attack_distance:float = 16.0
+@export var raycast:RayCast2D
+@export var navigation_agent:NavigationAgent2D
+
+var detected: = false
+var last_target_position:Vector2
+var local_direction:Vector2
+
+func _ready()->void:
+	target_finder.target_update.connect(on_target_update)
+
+
+func on_target_update()->void:
+	if target_finder.closest == null:
+		return
+	local_direction = target_finder.closest.global_position - bot_input.global_position
+	if local_direction.length() > attack_distance && line_of_sight():
+		bot_input.mover.input_resource.set_axis((local_direction * bot_input.axis_compensation).normalized())
+		bot_input.mover.input_resource.set_aim_direction(bot_input.mover.input_resource.axis)
+		return
+	navigation_update()
+
+## Raycast checks if anything from environment is in the way
+func line_of_sight()->bool:
+	raycast.target_position = local_direction
+	raycast.force_raycast_update()
+	return !raycast.is_colliding()
+
+func navigation_update()->void:
+	if (navigation_agent.target_position - bot_input.global_position).length() > 16.0:
+		navigation_agent.target_position = target_finder.closest.global_position
+	var point:Vector2 = navigation_agent.get_next_path_position()
+	var direction:Vector2 = (point - bot_input.global_position).normalized()
+	bot_input.mover.input_resource.set_axis((direction * bot_input.axis_compensation).normalized())
+	bot_input.mover.input_resource.set_aim_direction(bot_input.mover.input_resource.axis)

scripts/actor/bots/TargetFinder.gd

@@ -0,0 +1,19 @@
+class_name TargetFinder
+extends Node
+
+signal target_update
+
+@export var area:Area2D
+@export var bot_input:BotInput
+
+var target_list:Array[Node2D]
+var closest:Node2D
+
+func _ready()->void:
+	bot_input.input_update.connect(on_input_update)
+
+func on_input_update()->void:
+	target_list = area.get_overlapping_bodies()
+	closest = GameMath.get_closest_node_2d(bot_input.global_position, target_list)
+
+	target_update.emit()