Enemies & very basic enemy AI

scenes/game.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=11 format=3 uid="uid://bauklhpieuivd"]
+[gd_scene load_steps=12 format=3 uid="uid://bauklhpieuivd"]
 
 [ext_resource type="Script" uid="uid://d0qswyhwbhdua" path="res://scripts/game.gd" id="1_u5sy4"]
 [ext_resource type="Texture2D" uid="uid://dtwo7g0ipc4k" path="res://textures/ship_1.png" id="1_uwrxv"]
@@ -8,6 +8,7 @@
 [ext_resource type="AudioStream" uid="uid://5tr30e1tmdp6" path="res://sounds/collision.mp3" id="2_lbhrr"]
 [ext_resource type="AudioStream" uid="uid://b6tyof2j3ytbv" path="res://sounds/concrete_halls.mp3" id="3_0tnpc"]
 [ext_resource type="AudioStream" uid="uid://b1ung55xg31l3" path="res://sounds/boost_finish.mp3" id="3_p57ef"]
+[ext_resource type="Script" uid="uid://8d4jhy3fo32b" path="res://scripts/enemy.gd" id="9_0tnpc"]
 
 [sub_resource type="CircleShape2D" id="CircleShape2D_uwrxv"]
 radius = 16.0
@@ -59,6 +60,36 @@ rotation_smoothing_speed = 15.0
 shape = SubResource("CircleShape2D_lnu2h")
 debug_color = Color(0.9686392, 0, 0.4696517, 0.41960785)
 
+[node name="Enemy" type="RigidBody2D" parent="."]
+position = Vector2(0, -418)
+linear_damp = 6.247
+script = ExtResource("9_0tnpc")
+
+[node name="Boost" type="AudioStreamPlayer" parent="Enemy"]
+stream = ExtResource("2_iywne")
+
+[node name="BoostFinish" type="AudioStreamPlayer" parent="Enemy"]
+stream = ExtResource("3_p57ef")
+volume_db = -8.0
+
+[node name="Collision" type="AudioStreamPlayer" parent="Enemy"]
+stream = ExtResource("2_lbhrr")
+
+[node name="Sprite" type="Sprite2D" parent="Enemy"]
+texture = ExtResource("1_uwrxv")
+
+[node name="CollisionShape" type="CollisionShape2D" parent="Enemy"]
+shape = SubResource("CircleShape2D_uwrxv")
+
+[node name="Hitbox" type="Area2D" parent="Enemy"]
+
+[node name="CollisionShape" type="CollisionShape2D" parent="Enemy/Hitbox"]
+shape = SubResource("CircleShape2D_lnu2h")
+debug_color = Color(0.9686392, 0, 0.4696517, 0.41960785)
+
+[node name="SightCast" type="RayCast2D" parent="Enemy"]
+target_position = Vector2(0, -256)
+
 [node name="Unloadables" type="Node2D" parent="."]
 
 [node name="UI" type="CanvasLayer" parent="."]
@@ -89,3 +120,4 @@ grow_vertical = 2
 text = "DIST: 2048"
 
 [connection signal="body_shape_entered" from="Player/Hitbox" to="Player" method="_on_hitbox_body_shape_entered"]
+[connection signal="body_shape_entered" from="Enemy/Hitbox" to="Enemy" method="_on_hitbox_body_shape_entered"]

scripts/enemy.gd

@@ -0,0 +1,171 @@
+extends RigidBody2D
+
+var health = 1000
+var boost = 100
+var speed = 480
+var time_since_last_collision = 1
+var boosting = false
+
+var axis = 0
+var movement_axis = -1
+
+var AI_MODE_ATTACK = 1
+
+var ai_mode = AI_MODE_ATTACK
+
+var AI_STATE_EVADE_OBJECT = 1
+var AI_STATE_TRACK_ENEMY = 2
+var AI_STATE_STATIONARY_ENEMY = 3
+
+var object_to_evade = null
+var last_ai_state_before_evasion = AI_STATE_TRACK_ENEMY
+
+var ai_state = AI_STATE_TRACK_ENEMY
+var target_rotation = 0
+var target_rotation_speed = 1
+
+var ai_tick = 0.1
+@onready var player = get_parent().get_node("Player")
+
+func cast(angle):
+	$SightCast.rotation_degrees = angle
+	$SightCast.force_raycast_update()
+	
+	return $SightCast.get_collider()
+	
+func check_front():
+	var front_cast = cast(0)
+	if !front_cast:
+		$SightCast.position.x = -20
+		front_cast = cast(0)
+		
+		if !front_cast:
+			$SightCast.position.x = 20
+			front_cast = cast(0)
+			
+	$SightCast.position.x = 0
+			
+	if front_cast:
+		$SightCast.position.x = -20
+		$SightCast.force_raycast_update()
+		var cast_left = $SightCast.get_collision_point()
+		
+		$SightCast.position.x = 20
+		$SightCast.force_raycast_update()
+		var cast_right = $SightCast.get_collision_point()
+		
+		$SightCast.position.x = 0
+		
+		if (cast_left - $SightCast.position).length() > (cast_right - $SightCast.position).length(): return -1
+		else: return 1
+		
+	return 1
+
+func _process(delta: float) -> void:
+	ai_tick -= delta
+	
+	if boosting:
+		if Input.is_action_pressed("boost"):
+			boost -= delta * 40
+			
+			if boost <= 0:
+				boost = 0
+				boosting = false
+				$BoostFinish.play()
+		else:
+			boosting = false
+			$BoostFinish.play()
+	else:
+		boost += delta * 25
+		if boost > 100: boost = 100
+		
+		$Boost.stop()
+		if Input.is_action_just_pressed("boost") and (boost > 33):
+			boosting = true
+			$Boost.play()
+	
+	if time_since_last_collision <= 1:
+		time_since_last_collision += delta
+		
+	if ai_tick < 0:
+		ai_tick = 0.1
+		
+		movement_axis = -1
+		
+		if ai_state == AI_STATE_TRACK_ENEMY:
+			target_rotation = global_position.direction_to(player.position).angle() + deg_to_rad(270)
+			
+		if ai_state == AI_STATE_STATIONARY_ENEMY:
+			target_rotation = global_position.direction_to(player.position).angle() + deg_to_rad(270)
+			movement_axis = 0
+			
+		var front_cast = cast(0)
+		if !front_cast:
+			$SightCast.position.x = -20
+			front_cast = cast(0)
+			
+			if !front_cast:
+				$SightCast.position.x = 20
+				front_cast = cast(0)
+		
+		$SightCast.position.x = 0
+			
+		if front_cast:
+			var front_cast_distance = ($SightCast.get_collision_point() - position).length()
+			
+			if (front_cast_distance < 160 * (speed / 300)) and (front_cast_distance < (player.position - position).length()):
+				if ai_state != AI_STATE_EVADE_OBJECT: last_ai_state_before_evasion = ai_state 
+				
+				ai_state = AI_STATE_EVADE_OBJECT
+				target_rotation += deg_to_rad(45) * check_front()
+				
+				object_to_evade = front_cast
+				
+		target_rotation_speed = 1
+			
+		if ai_state == AI_STATE_EVADE_OBJECT:
+			if not front_cast:
+				ai_state = last_ai_state_before_evasion
+			else:
+				var front_cast_distance = ($SightCast.get_collision_point() - position).length()
+				if front_cast_distance > 160 * (speed / 300):
+					ai_state = last_ai_state_before_evasion
+					
+		print(ai_state)
+
+func _physics_process(delta: float) -> void:
+	axis = 0
+	
+	var difference = fmod(target_rotation, deg_to_rad(360)) - fmod(rotation, deg_to_rad(360)) 
+	var normalized_difference = fmod(difference + deg_to_rad(180), deg_to_rad(360)) - deg_to_rad(180)
+	var target_distance = normalized_difference
+	
+	if target_distance < 0:
+		axis = target_rotation_speed
+	if target_distance > 0:
+		axis = -target_rotation_speed
+	
+	angular_velocity = deg_to_rad(180 * axis)
+	
+	var final_speed = speed
+	
+	if boosting:
+		movement_axis = -1
+		final_speed = 1024
+	
+	# Slow down on collision and gradually speed up
+	if time_since_last_collision < 0.85: final_speed *= (time_since_last_collision + 0.15)
+	
+	var new_velocity = transform.y * movement_axis * final_speed
+	
+	if (new_velocity.length() > linear_velocity.length() - 12):
+		linear_velocity = new_velocity
+
+
+func _on_hitbox_body_shape_entered(body_rid: RID, body: Node2D, body_shape_index: int, local_shape_index: int) -> void:
+	if body.linear_velocity.length() + linear_velocity.length() > 256:
+		health -= 100
+		
+		$Collision.play()
+		
+		time_since_last_collision = 0

scripts/enemy.gd.uid

@@ -0,0 +1 @@
+uid://8d4jhy3fo32b

scripts/game.gd

@@ -27,7 +27,7 @@ func _process(delta: float) -> void:
 		if time_since_last_atmospheric_track > 60:
 			var tracks = [$BalladOfTheCats, $ConcreteHalls]
 			
-			current_atmospheric_track = tracks[randi_range(0, tracks.size())]
+			current_atmospheric_track = tracks[randi_range(0, tracks.size() - 1)]
 			current_atmospheric_track.play()
 	
 	chunk_tick_timer -= delta