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 turn_rate = 0.01
12	export var health = -1
13	export var max_health = 10
14	export var is_targeted = false
15	export var is_invincible = false
16	signal enemy_killed
17
18	var velocity = Vector2.ZERO
19	var dead = false
20
21	func _ready() -> void:
22	$AnimationPlayer.play("fade_in")
23	if health < 0 or health > max_health:
24	health = max_health
25	else:
26	var hurt_points = max_health - health
27	health = max_health
28	for i in hurt_points:
29	hurt()
30
31	func _process(_delta: float) -> void:
32	$Graphics/Alive/Container/HealthLabel.text = "%s / %s" % [health, max_health]
33	$Graphics/Alive/Container.global_rotation = 0
34	$Graphics/Alive/Target.visible = is_targeted
35	$Graphics/Alive/Target.global_rotation = 0
36
37	func _physics_process(_delta: float) -> void:
38	if dead:
39	return
40
41	velocity = move_and_slide(velocity)
42	global_rotation = velocity.angle() + PI/2.0
43
44	var ray_length = ray_cast_2d.cast_to.length()
45	if ray_cast_2d.is_colliding():
46	var players = get_tree().get_nodes_in_group("player")
47	var player: Player = players[0]
48	var dist_to_player = global_position.distance_to(player.global_position)
49	if ray_cast_2d.get_collider() == player and dist_to_player < (ray_length + 5):
50	player.hurt(2)
51	var explosion = Explosion.instance()
52	explosion.transform = transform
53	get_parent().add_child(explosion)
54	kill()
55
56	func turn_towards(pos: Vector2):
57	var to_dir = (pos - global_position).normalized()
58	var curr_dir = velocity.normalized()
59	var dir_diff = to_dir - curr_dir
60	var change = dir_diff.normalized() * turn_rate * move_speed
61	velocity = (velocity + change).normalized() * move_speed
62
63	func hurt():
64	if dead \|\| is_invincible:
65	return
66	health -= 1
67	var smoke = Smoke.instance()
68	var smoke_pos = get_damage_point_on_body()
69	smoke.position = smoke_pos
70	add_child(smoke)
71	if health <= 0:
72	kill()
73
74	func kill():
75	if dead \|\| is_invincible:
76	return
77	dead = true
78	$Graphics/Alive.hide()
79	$CollisionPolygon2D.set_deferred("disabled", true)
80	var explosion = Explosion.instance()
81	explosion.connect("explosion_done", self, "_on_death_explosion_finished")
82	$Graphics.add_child(explosion)
83	z_index = -1
84	emit_signal("enemy_killed")
85
86	func _on_death_explosion_finished():
87	$AnimationPlayer.play("fade_out")
88
89	func get_damage_point_on_body() -> Vector2:
90	var child_count = damage_points.get_child_count()
91	var random_index = randi() % child_count
92	var random_child: Position2D = damage_points.get_child(random_index)
93	return random_child.position
94
95	func remove_thyself():
96	queue_free()
97
98	func _on_Area2D_body_entered(body: Node) -> void:
99	var players = get_tree().get_nodes_in_group("player")
100	var player: Player = players[0]
101	var is_player = body == player
102	if is_player:
103	player.hurt(2)
104	var explosion = Explosion.instance()
105	explosion.transform = transform
106	get_parent().add_child(explosion)
107	kill()
108