Enemy.gd

1	extends KinematicBody2D
2	class_name Enemy
3
4	onready var ray_cast_2d: RayCast2D = $RayCast2D
5	onready var damage_points = $DamagePoints
6	const Utils = preload("res://Utils.gd")
7	const Explosion = preload("res://Explosion.tscn")
8	const Smoke = preload("res://Smoke.tscn")
9
10	export var move_speed = 40
11	export var health = -1
12	export var max_health = 10
13	export var is_targeted = false
14	export var is_invincible = false
15	signal enemy_killed
16
17	var velocity = Vector2.ZERO
18	var dead = false
19
20	func _ready() -> void:
21	if health < 0 or health > max_health:
22	health = max_health
23	else:
24	var hurt_points = max_health - health
25	health = max_health
26	for i in hurt_points:
27	hurt()
28
29	func _process(_delta: float) -> void:
30	$Graphics/Alive/Container/HealthLabel.text = "%s / %s" % [health, max_health]
31	$Graphics/Alive/Container.global_rotation = 0
32	$Graphics/Alive/Target.visible = is_targeted
33
34	func _physics_process(_delta: float) -> void:
35	if dead:
36	return
37	var players = get_tree().get_nodes_in_group("player")
38	var player: Player = players[0]
39	if player.dead:
40	return
41	var dist_to_player = global_position.distance_to(player.global_position)
42	var dir_to_player = global_position.direction_to(player.global_position)
43	var angle_to_player = dir_to_player.angle() + PI / 2.0
44	var vel = dir_to_player * move_speed
45	global_rotation = angle_to_player
46	velocity = move_and_slide(vel)
47
48	var ray_length = ray_cast_2d.cast_to.length()
49	if ray_cast_2d.is_colliding():
50	if ray_cast_2d.get_collider() == player and dist_to_player < (ray_length + 5):
51	player.hurt(2)
52	var explosion = Explosion.instance()
53	explosion.transform = transform
54	get_parent().add_child(explosion)
55	kill()
56
57	func hurt():
58	if dead \|\| is_invincible:
59	return
60	health -= 1
61	var smoke = Smoke.instance()
62	var smoke_pos = get_damage_point_on_body()
63	smoke.position = smoke_pos
64	add_child(smoke)
65	if health <= 0:
66	kill()
67
68	func kill():
69	if dead \|\| is_invincible:
70	return
71	dead = true
72	$Graphics/Alive.hide()
73	$CollisionPolygon2D.queue_free()
74	var explosion = Explosion.instance()
75	explosion.connect("explosion_done", self, "_on_death_explosion_finished")
76	$Graphics.add_child(explosion)
77	z_index = -1
78	emit_signal("enemy_killed")
79
80	func _on_death_explosion_finished():
81	$AnimationPlayer.play("fade_out")
82
83	func get_damage_point_on_body() -> Vector2:
84	var child_count = damage_points.get_child_count()
85	var random_index = randi() % child_count
86	var random_child: Position2D = damage_points.get_child(random_index)
87	return random_child.position