game: add base enemy and rat

scenes/enemies/enemy_base.gd

@@ -0,0 +1,144 @@
+class_name EnemyBase
+extends CharacterBody2D
+
+@export var move_speed: float = 100
+@export var max_health: float = 10.0
+@export var default_contact_damage: float = 0.0
+@export var target_distance: float = 6.0
+@export var path_update_interval: float = 0.5
+
+@onready var target_cast: RayCast2D = $TargetCast
+@onready var animation_player: AnimationPlayer = $AnimationPlayer
+@onready var contact_damage_cd: Timer = $ContactDamageCD
+@onready var nav_agent: NavigationAgent2D = $NavigationAgent2D
+@onready var collision_shape_2d: CollisionShape2D = $CollisionShape2D
+@onready var shape_cast_2d: ShapeCast2D = $ShapeCast2D
+
+var player: Player
+var target: Node2D
+var god_mode: bool = false
+var is_dead: bool = false
+var health: float
+
+var _path_update_timer: float = 0.0
+
+
+func _ready() -> void:
+	health = max_health
+	shape_cast_2d.shape.radius = collision_shape_2d.shape.radius
+	shape_cast_2d.enabled = false
+	_find_player()
+
+
+func _find_player():
+	if not player:
+		player = get_tree().get_first_node_in_group(GlobalConst.GROUP_PLAYER)
+		target = player
+
+
+func _physics_process(delta: float) -> void:
+	if not target:
+		return
+	do_movement(delta)
+	check_contact_damage()
+
+
+func do_movement(delta: float) -> void:
+	if not target:
+		return
+	if global_position.distance_to(target.global_position) < target_distance:
+		return
+	_path_update_timer -= delta
+	if _has_direct_path():
+		shape_cast_2d.enabled = false
+		_do_simple_movement()
+	else:
+		_do_nav_agent_movement()
+
+
+func _has_direct_path():
+	target_cast.target_position = to_local(target.global_position)
+	target_cast.enabled = true
+	return not target_cast.is_colliding()
+
+
+func _do_simple_movement():
+	var direction = global_position.direction_to(target.global_position)
+	var distance = global_position.distance_to(target.global_position)
+	if distance > 4:
+		velocity = direction * move_speed
+		move_and_slide()
+
+
+func _do_nav_agent_movement():
+	if _path_update_timer <= 0.0:
+		_path_update_timer = path_update_interval
+		nav_agent.target_position = target.global_position
+
+	if nav_agent.is_navigation_finished():
+		return
+	var next_point = nav_agent.get_next_path_position()
+	var direction = (next_point - global_position).normalized()
+	shape_cast_2d.target_position = to_local(next_point)
+	shape_cast_2d.enabled = true
+	if shape_cast_2d.is_colliding():
+		direction = direction.bounce(shape_cast_2d.get_collision_normal(0)).normalized()
+
+	velocity = direction * move_speed
+	move_and_slide()
+
+
+func check_contact_damage():
+	if default_contact_damage == 0.0:
+		return
+	if global_position.distance_to(target.global_position) > target_distance:
+		return
+	deal_contact_damage()
+
+
+func deal_contact_damage():
+	if target.is_in_group("damagable"):
+		if contact_damage_cd.is_stopped():
+			target.take_damage(default_contact_damage)
+			contact_damage_cd.start()
+
+
+func take_damage(value: float, is_crit: bool = false):
+	if god_mode:
+		return
+	health -= value
+	var dm = preload("res://scenes/damage_numbers.tscn").instantiate()
+	dm.damage_taken = value
+	dm.critical_damage = is_crit
+	animation_player.play("generic_anims/take_damage")
+	add_child(dm)
+	if health <= 0:
+		die()
+
+
+func cheer():
+	target_distance = 2
+	if not animation_player.is_playing():
+		animation_player.play("generic_anims/cheer")
+
+
+func die():
+	if is_dead:
+		return
+	is_dead = true
+	drop_xp_orb()
+	target = null
+	velocity = Vector2.ZERO
+	animation_player.play("generic_anims/die")
+
+
+func drop_xp_orb() -> void:
+	var orb: XPOrb = preload("res://scenes/xp_orb.tscn").instantiate()
+	orb.value = 5
+	orb.position = position
+	get_parent().add_child(orb)
+
+
+func _on_animation_player_animation_finished(anim_name: StringName) -> void:
+	if is_dead:
+		queue_free()

scenes/enemies/enemy_base.gd.uid

@@ -0,0 +1 @@
+uid://dxn17u7ltuibw

scenes/enemies/enemy_base.tscn

@@ -0,0 +1,75 @@
+[gd_scene load_steps=8 format=3 uid="uid://b7vq8xspnlyeu"]
+
+[ext_resource type="Script" uid="uid://dxn17u7ltuibw" path="res://scenes/enemies/enemy_base.gd" id="1_qty17"]
+[ext_resource type="AnimationLibrary" uid="uid://dos4y853hq1gu" path="res://animation/generic_anims.res" id="2_pkqou"]
+
+[sub_resource type="PlaceholderTexture2D" id="PlaceholderTexture2D_pkqou"]
+size = Vector2(32, 32)
+
+[sub_resource type="CircleShape2D" id="CircleShape2D_satqt"]
+radius = 6.0
+
+[sub_resource type="Animation" id="Animation_satqt"]
+length = 0.001
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath("Sprite2D:position")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 0,
+"values": [Vector2(0, 0)]
+}
+tracks/1/type = "value"
+tracks/1/imported = false
+tracks/1/enabled = true
+tracks/1/path = NodePath("Sprite2D:modulate")
+tracks/1/interp = 1
+tracks/1/loop_wrap = true
+tracks/1/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 0,
+"values": [Color(1, 1, 1, 1)]
+}
+
+[sub_resource type="AnimationLibrary" id="AnimationLibrary_qa0nx"]
+_data = {
+&"RESET": SubResource("Animation_satqt")
+}
+
+[sub_resource type="CircleShape2D" id="CircleShape2D_pkqou"]
+
+[node name="EnemyBase" type="CharacterBody2D"]
+collision_layer = 2
+collision_mask = 3
+script = ExtResource("1_qty17")
+
+[node name="Sprite2D" type="Sprite2D" parent="."]
+texture = SubResource("PlaceholderTexture2D_pkqou")
+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="."]
+shape = SubResource("CircleShape2D_satqt")
+
+[node name="TargetCast" type="RayCast2D" parent="." groups=["damagable", "enemy"]]
+enabled = false
+collision_mask = 3
+
+[node name="AnimationPlayer" type="AnimationPlayer" parent="."]
+libraries = {
+&"": SubResource("AnimationLibrary_qa0nx"),
+&"generic_anims": ExtResource("2_pkqou")
+}
+
+[node name="ContactDamageCD" type="Timer" parent="."]
+wait_time = 0.5
+
+[node name="NavigationAgent2D" type="NavigationAgent2D" parent="."]
+
+[node name="ShapeCast2D" type="ShapeCast2D" parent="."]
+shape = SubResource("CircleShape2D_pkqou")
+
+[connection signal="animation_finished" from="AnimationPlayer" to="." method="_on_animation_player_animation_finished"]

scenes/enemies/enemy_rat.gd

@@ -0,0 +1 @@
+extends EnemyBase

scenes/enemies/enemy_rat.gd.uid

@@ -0,0 +1 @@
+uid://ddvxp8eada0mw

scenes/enemies/enemy_rat.tscn

@@ -0,0 +1,13 @@
+[gd_scene load_steps=4 format=3 uid="uid://c7jaqltfjhn5n"]
+
+[ext_resource type="PackedScene" uid="uid://b7vq8xspnlyeu" path="res://scenes/enemies/enemy_base.tscn" id="1_o1awd"]
+[ext_resource type="Texture2D" uid="uid://in5id1p5bxux" path="res://assets/sprites/rat_small.png" id="2_gscll"]
+[ext_resource type="Script" uid="uid://ddvxp8eada0mw" path="res://scenes/enemies/enemy_rat.gd" id="2_sari4"]
+
+[node name="EnemyRat" instance=ExtResource("1_o1awd")]
+script = ExtResource("2_sari4")
+max_health = 50.0
+default_contact_damage = 5.0
+
+[node name="Sprite2D" parent="." index="0"]
+texture = ExtResource("2_gscll")