Add attack mechanic demo - tutorial with Heartbeast

final/17-Attack demo with Heartbeast/end/Game.tscn

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+[gd_scene load_steps=4 format=2]
+
+[ext_resource path="res://art/bg.png" type="Texture" id=1]
+[ext_resource path="res://characters/player/Player.tscn" type="PackedScene" id=2]
+[ext_resource path="res://characters/enemy/Enemy.tscn" type="PackedScene" id=3]
+
+[node name="Game" type="Node"]
+
+[node name="bg" type="Sprite" parent="."]
+
+position = Vector2( 511.5, 320.5 )
+scale = Vector2( 0.748902, 0.832031 )
+texture = ExtResource( 1 )
+_sections_unfolded = [ "Transform" ]
+__meta__ = {
+"_edit_lock_": true
+}
+
+[node name="Player" parent="." instance=ExtResource( 2 )]
+
+position = Vector2( 329, 444 )
+
+[node name="Enemy" parent="." instance=ExtResource( 3 )]
+
+position = Vector2( 699, 371 )
+
+[node name="Enemy2" parent="." instance=ExtResource( 3 )]
+
+position = Vector2( 622, 559 )
+
+[node name="Enemy3" parent="." instance=ExtResource( 3 )]
+
+position = Vector2( 133, 365 )
+max_health = 4
+
+

final/17-Attack demo with Heartbeast/end/art/bg.png.import

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+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/bg.png-ca4dd02b5a08671d1e8200d74b5e8347.stex"
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0

final/17-Attack demo with Heartbeast/end/characters/Character.gd

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+extends KinematicBody2D
+
+signal health_changed
+signal died
+
+export(String) var weapon_scene_path = "res://characters/weapons/spear/Spear.tscn"
+
+var weapon = null
+var weapon_path = ""
+
+onready var animation_player = $AnimationPlayer
+
+enum STATES {IDLE, WALK, ATTACK, STAGGER, DIE, DEAD}
+var current_state = null
+var previous_state = null
+
+var speed = 400
+var look_direction = Vector2(1, 0)
+var move_direction = Vector2()
+var input_direction = Vector2()
+
+
+export var max_health = 1
+var health
+
+
+func _ready():
+	health = max_health
+
+	# Weapon setup
+	var weapon_instance = load(weapon_scene_path).instance()
+	var weapon_anchor = $WeaponSpawnPoint/WeaponAnchorPoint
+	weapon_anchor.add_child(weapon_instance)
+
+	weapon = weapon_anchor.get_child(0)
+
+	weapon_path = weapon.get_path()
+	weapon.connect("attack_finished", self, "_on_Weapon_attack_finished")
+
+	_change_state(IDLE)
+
+
+
+func _physics_process(delta):
+
+	# Movement
+	if current_state == IDLE:
+		if input_direction:
+			_change_state(WALK)
+
+	if current_state == WALK:
+		move_direction = input_direction
+
+		if move_direction.x:
+			look_direction.x = move_direction.x
+			$WeaponSpawnPoint.scale.x = look_direction.x
+		if move_direction.y:
+			look_direction.y = move_direction.y
+
+		if not move_direction:
+			_change_state(IDLE)
+
+		var velocity = move_direction * speed * delta
+		move_and_collide(velocity)
+
+
+func _change_state(new_state):
+	previous_state = current_state
+	current_state = new_state
+
+	# initialize/enter the state
+	match new_state:
+		IDLE:
+			animation_player.play("idle")
+		ATTACK:
+			# see Weapon.gd for damage management
+			weapon.attack()
+		STAGGER:
+			animation_player.play("take_damage")
+		DEAD:
+			queue_free()
+
+
+func take_damage(count):
+	if current_state == DEAD:
+		return
+
+	health -= count
+	if health <= 0:
+		health = 0
+		_change_state(DEAD)
+		emit_signal("died")
+		return
+
+	_change_state(STAGGER)
+	emit_signal("health_changed", health)
+
+
+func _on_AnimationPlayer_animation_finished( name ):
+	if name == "take_damage":
+		_change_state(IDLE)
+
+
+func _on_Weapon_attack_finished():
+	_change_state(IDLE)

final/17-Attack demo with Heartbeast/end/characters/Character.tscn

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+[gd_scene load_steps=9 format=2]
+
+[ext_resource path="res://characters/Character.gd" type="Script" id=1]
+[ext_resource path="res://characters/shared/shadow.png" type="Texture" id=2]
+[ext_resource path="res://characters/player/buddy_green.png" type="Texture" id=3]
+[ext_resource path="res://characters/DebugCharacter.gd" type="Script" id=4]
+
+[sub_resource type="Animation" id=1]
+
+resource_name = "_setup"
+length = 1.0
+loop = false
+step = 0.1
+
+[sub_resource type="Animation" id=2]
+
+resource_name = "idle"
+length = 1.0
+loop = false
+step = 0.1
+
+[sub_resource type="Animation" id=3]
+
+resource_name = "take_damage"
+length = 0.6
+loop = false
+step = 0.1
+tracks/0/type = "value"
+tracks/0/path = NodePath("Body:self_modulate")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/imported = false
+tracks/0/keys = {
+"times": PoolRealArray( 0, 0.6 ),
+"transitions": PoolRealArray( 0.390557, 1 ),
+"update": 0,
+"values": [ Color( 1, 0, 0, 1 ), Color( 1, 1, 1, 1 ) ]
+}
+
+[sub_resource type="RectangleShape2D" id=4]
+
+custom_solver_bias = 0.0
+extents = Vector2( 19.9141, 16 )
+_sections_unfolded = [ "Resource" ]
+
+[node name="Character" type="KinematicBody2D" groups=[
+"character",
+]]
+
+input_pickable = false
+collision_layer = 1
+collision_mask = 1
+collision/safe_margin = 0.08
+script = ExtResource( 1 )
+_sections_unfolded = [ "Collision", "collision" ]
+weapon_scene_path = "res://characters/weapons/spear/Spear.tscn"
+max_health = 1
+
+[node name="AnimationPlayer" type="AnimationPlayer" parent="."]
+
+playback_process_mode = 1
+playback_default_blend_time = 0.0
+root_node = NodePath("..")
+anims/_setup = SubResource( 1 )
+anims/idle = SubResource( 2 )
+anims/take_damage = SubResource( 3 )
+playback/active = true
+playback/speed = 1.0
+blend_times = [  ]
+autoplay = ""
+
+[node name="Shadow" type="Sprite" parent="."]
+
+scale = Vector2( 0.546225, 0.546225 )
+texture = ExtResource( 2 )
+_sections_unfolded = [ "Transform" ]
+
+[node name="Body" type="Sprite" parent="."]
+
+scale = Vector2( 0.446435, 0.446435 )
+texture = ExtResource( 3 )
+offset = Vector2( 0, -69 )
+_sections_unfolded = [ "Offset", "Transform", "Visibility" ]
+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="."]
+
+position = Vector2( 0, -15.8886 )
+shape = SubResource( 4 )
+
+[node name="WeaponSpawnPoint" type="Node2D" parent="."]
+
+position = Vector2( 0, -30 )
+_sections_unfolded = [ "Transform" ]
+
+[node name="WeaponAnchorPoint" type="Node2D" parent="WeaponSpawnPoint"]
+
+_sections_unfolded = [ "Transform" ]
+
+[node name="DisplayDebugInfo" type="Label" parent="."]
+
+anchor_left = 0.0
+anchor_top = 0.0
+anchor_right = 0.0
+anchor_bottom = 0.0
+margin_left = -46.0
+margin_top = -84.0
+margin_right = 47.0
+margin_bottom = -68.0
+rect_pivot_offset = Vector2( 0, 0 )
+rect_clip_content = false
+mouse_filter = 2
+size_flags_horizontal = 1
+size_flags_vertical = 4
+text = "Debug info"
+align = 1
+percent_visible = 1.0
+lines_skipped = 0
+max_lines_visible = -1
+script = ExtResource( 4 )
+
+[connection signal="animation_finished" from="AnimationPlayer" to="." method="_on_AnimationPlayer_animation_finished"]
+
+

final/17-Attack demo with Heartbeast/end/characters/DebugCharacter.gd

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+extends Label
+
+onready var Character = $'..'
+
+func _ready():
+	visible = false
+
+func _physics_process(delta):
+	text = str(Character.current_state)

final/17-Attack demo with Heartbeast/end/characters/enemy/Enemy.gd

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+extends "res://characters/Character.gd"
+
+export(int) var patrol_distance = 200
+var start_position = Vector2()
+var end_position = Vector2()
+
+enum STATES_MIND {WAIT, MOVE, ACT}
+var current_mind_state = WAIT
+var previous_mind_state = null
+
+var last_move_direction = Vector2()
+
+onready var wait_timer = $WaitTimer
+onready var attack_timer = $AttackTimer
+
+var first_ai_cycle = true
+
+func _ready():
+	speed = 240
+	start_position = position
+	end_position = start_position + Vector2(patrol_distance, 0)
+
+	_change_mind_state(WAIT)
+	randomize()
+	wait_timer.stop()
+	wait_timer.wait_time = randf() * 3
+	wait_timer.start()
+
+
+func _physics_process(delta):
+	if current_mind_state == MOVE:
+		if input_direction.x == 1 and position.x > end_position.x \
+			or input_direction.x == -1 and position.x < start_position.x:
+			last_move_direction = input_direction
+			_change_mind_state(WAIT)
+
+
+func _change_mind_state(new_state):
+	previous_mind_state = current_mind_state
+	current_mind_state = new_state
+
+	match current_mind_state:
+		WAIT:
+			input_direction = Vector2()
+			wait_timer.wait_time = 1.0
+			wait_timer.start()
+		MOVE:
+			input_direction.x = -last_move_direction.x
+			if last_move_direction.x == 0:
+				input_direction.x = 1
+			wait_timer.stop()
+
+
+func _on_WaitTimer_timeout():
+	wait_timer.stop()
+	if first_ai_cycle:
+		first_ai_cycle = false
+		_change_mind_state(MOVE)
+		return
+
+	_change_state(ATTACK)
+	_change_mind_state(ACT)
+
+
+func _on_Weapon_attack_finished():
+	_change_mind_state(MOVE)
+	_change_state(IDLE)