Add state modifier stack to pop on/off state changes.

Main.tscn

@@ -1,10 +1,8 @@
-[gd_scene load_steps=19 format=2]
+[gd_scene load_steps=17 format=2]
 
-[ext_resource path="res://src/playerB/Player.tscn" type="PackedScene" id=1]
 [ext_resource path="res://src/playerC/Player.tscn" type="PackedScene" id=2]
 [ext_resource path="res://assets/Tiles/Assets/Assets.png" type="Texture" id=3]
 [ext_resource path="res://src/CameraControl-Position2D.gd" type="Script" id=5]
-[ext_resource path="res://src/enemyB/Enemy2.tscn" type="PackedScene" id=6]
 
 [sub_resource type="ConvexPolygonShape2D" id=2]
 points = PoolVector2Array( 16, 16, 0, 16, 0, 0, 16, 0 )
@@ -145,12 +143,8 @@ __meta__ = {
 "_edit_lock_": true
 }
 
-[node name="Player" parent="." instance=ExtResource( 1 )]
+[node name="Player" parent="." instance=ExtResource( 2 )]
-position = Vector2( 154, 27 )
-
-[node name="Player2" parent="." instance=ExtResource( 2 )]
 position = Vector2( 81, 27 )
-player_number = 2
 
 [node name="CameraControl" type="Position2D" parent="."]
 process_priority = 1
@@ -194,6 +188,3 @@ shape = SubResource( 13 )
 [node name="CollisionShape2D2" type="CollisionShape2D" parent="CameraBoundaries"]
 position = Vector2( 1281, 68 )
 shape = SubResource( 13 )
-
-[node name="NewEnemy" parent="." instance=ExtResource( 6 )]
-position = Vector2( 400, 81 )

project.godot

@@ -20,14 +20,32 @@ _global_script_classes=[ {
 "path": "res://src/playerB/player_move_component.gd"
 }, {
 "base": "Node",
+"class": "PushdownStateMachine",
+"language": "GDScript",
+"path": "res://src/pushdown_state_machine.gd"
+}, {
+"base": "Node",
 "class": "State",
 "language": "GDScript",
 "path": "res://src/state.gd"
+}, {
+"base": "Node",
+"class": "StateMachine",
+"language": "GDScript",
+"path": "res://src/state_machine.gd"
+}, {
+"base": "Node",
+"class": "StateModifier",
+"language": "GDScript",
+"path": "res://src/state_modifier.gd"
 } ]
 _global_script_class_icons={
 "Enemy": "",
 "Movement": "",
-"State": ""
+"PushdownStateMachine": "",
+"State": "",
+"StateMachine": "",
+"StateModifier": ""
 }
 
 [application]

src/CameraControl-Position2D.gd

@@ -80,7 +80,7 @@ func jump_to_grid_position():
 	else:
 		$Camera2D.limit_left = -10000000
 	if $Right.is_colliding():
-		print("Oh God! No! ", $Right.get_collision_point().x, $Right.global_position)
+		#print("Oh God! No! ", $Right.get_collision_point().x, $Right.global_position)
 		$Camera2D.limit_right = $Right.get_collision_point().x
 	else:
 		$Camera2D.limit_right = 10000000

src/components/Hurtbox_Component.tscn

@@ -0,0 +1,13 @@
+[gd_scene load_steps=2 format=2]
+
+[sub_resource type="RectangleShape2D" id=148]
+extents = Vector2( 11.5, 14.5 )
+
+[node name="Hurtbox_Component" type="Area2D"]
+collision_layer = 16
+collision_mask = 128
+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="."]
+self_modulate = Color( 1, 0, 0, 1 )
+position = Vector2( 0, -4 )
+shape = SubResource( 148 )

src/enemyB/states/attack.gd

@@ -5,7 +5,7 @@ export (NodePath) var idle_node
 onready var idle_state: State = get_node(idle_node)
 var can_fire = true
 
-func enter() -> void:
+func enter(state_modifiers: Array = []) -> void:
 	.enter()
 	parent.velocity.x = 0
 	parent.set_hitbox(false)

src/enemyB/states/hurt.gd

@@ -4,7 +4,7 @@ export (NodePath) var idle_node
 
 onready var idle_state: State = get_node(idle_node)
 
-func enter() -> void:
+func enter(state_modifiers: Array = []) -> void:
 	.enter()
 	parent.velocity.x = 0
 	parent.set_hurtbox(false)

src/enemyB/states/idle.gd

@@ -14,7 +14,7 @@ onready var fire_state: State = get_node(fire_node)
 onready var wander_state: State = get_node(wander_node)
 onready var attack_state: State = get_node(attack_node)
 
-func enter() -> void:
+func enter(state_modifiers: Array = []) -> void:
 	.enter()
 	parent.set_hurtbox(true)
 	parent.velocity.x = 0

src/enemyB/states/jump.gd

@@ -11,7 +11,7 @@ onready var move_state: State = get_node(move_node)
 
 export var jump_force: float = 900.0
 
-func enter() -> void:
+func enter(state_modifiers: Array = []) -> void:
 	.enter()
 	parent.velocity.y = -jump_force
 

src/enemyB/states/wander.gd

@@ -13,7 +13,7 @@ onready var attack_state: State = get_node(attack_node)
 var flip_flop = false
 var move_direction_x = 1.0
 
-func enter() -> void:
+func enter(state_modifiers: Array = []) -> void:
 	.enter()
 	parent.set_hurtbox(true)
 	state_timeout.start()

src/playerC/Player-KinematicBody2D.gd

@@ -5,13 +5,15 @@ var direction = Vector2(0,0)
 
 export var player_number: int = 1
 
+export var sprite_facing_right: bool = true
+
 onready var movement_animations: AnimatedSprite = $AnimatedSprite
 
 onready var movement_state_machine: Node = $Controllers/state_machine
 
 onready var player_move_component = $Controllers/move_component
 
-onready var player_hurtbox = $Hurtbox/CollisionShape2D
+onready var player_hurtbox = $Hurtbox_Component/CollisionShape2D
 
 onready var gun = $Gun
 
@@ -62,118 +64,3 @@ func shoot_projectile():
 	var is_shooting = false
 	is_shooting = gun.shoot(direction.x)
 
-#func _ready():
-#	# Static types are necessary here to avoid warnings.
-#	var camera: Camera2D = $Camera2D
-#	camera.custom_viewport = $"../.."
-#	yield(get_tree(), "idle_frame")
-#	camera.make_current()
-
-#
-#func _physics_process(delta):
-#	# Horizontal movement 
-#	velocity.x = (Input.get_axis("ui_left", "ui_right") * WALK_MAX_SPEED)
-#
-#	# Vertical movement code. Apply gravity.
-#	velocity.y += gravity * delta
-#
-#	# Move based on the velocity and snap to the ground.
-#	#velocity = move_and_slide_with_snap(velocity, Vector2.DOWN, Vector2.UP)
-#	velocity = move_and_slide(velocity, Vector2(0, -1))
-#
-#	# Check for jumping. is_on_floor() must be called after movement code.
-#	# Apply Jump velocity
-#	if is_on_floor() and Input.is_action_just_pressed("ui_accept"):
-#		velocity.y = -JUMP_SPEED
-#
-#	# Animate based on last state and velocity 
-#	if velocity.x > 0 and _animated_sprite.flip_h != true:
-#		_animated_sprite.flip_h = true
-#	if velocity.x < 0 and _animated_sprite.flip_h != false:
-#		_animated_sprite.flip_h = false
-#
-#	# forced state changes like falling an gitting hurt
-#	if velocity.y > 0 and player_state != STATE.JUMP and player_state != STATE.FALL:
-#		print("STATE_TRANSITION: Fall")
-#		player_state = STATE.FALL
-#
-#
-#	# Each state should trigger its own animation
-#	match player_state:
-#		STATE.IDLE:
-#			# Transitions
-#			if velocity.y == -JUMP_SPEED:
-#				print("STATE_TRANSITION: Jump")
-#				player_last_state = STATE.IDLE
-#				player_state = STATE.JUMP
-#			elif velocity.x != 0:
-#				print("STATE_TRANSITION: Run")
-#				player_last_state = STATE.IDLE
-#				player_state = STATE.RUN
-#			# Animation
-#			if player_last_state != STATE.IDLE:
-#				$IdleTimeout.start()
-#				_animated_sprite.play("idle")
-#				player_last_state = STATE.IDLE
-#			if $IdleTimeout.time_left == 0 and _animated_sprite.animation != 'blink':
-#				_animated_sprite.play("blink")
-#				animation_play_finished = false
-#			if $IdleTimeout.time_left == 0 and animation_play_finished == true:
-#				$IdleTimeout.start()
-#				_animated_sprite.play("idle")
-#				print("blink over")
-#
-#		STATE.JUMP:
-#			# Transitions
-#			if is_on_floor():
-#				print("STATE_TRANSITION: Idle")
-#				_animated_sprite.play("idle")
-#				player_last_state = STATE.JUMP
-#				player_state = STATE.IDLE
-#			# Animation
-#			if player_last_state != STATE.JUMP:
-#				_animated_sprite.play("jump")
-#				player_last_state = STATE.JUMP
-#
-#		STATE.FALL:
-#			# Transitions
-#			if is_on_floor():
-#				print("STATE_TRANSITION: Idle")
-#				_animated_sprite.play("idle")
-#				player_last_state = STATE.FALL
-#				player_state = STATE.IDLE
-#			# Animation
-#			if player_last_state != STATE.FALL:
-#				_animated_sprite.animation = "jump"
-#				_animated_sprite.frame = 8
-#				_animated_sprite.stop()
-#				player_last_state = STATE.FALL
-#
-#		STATE.RUN:
-#			# print (_animated_sprite.animation ) # apparentl playing doesn't stop when loop is disabled.
-#			# Transitions
-#			if velocity.y == -JUMP_SPEED:
-#				print("STATE_TRANSITION: Jump")
-#				_animated_sprite.play("jump")
-#				player_last_state = STATE.RUN
-#				player_state = STATE.JUMP
-#			elif velocity.x == 0:
-#				print("STATE_TRANSITION: Idle")
-#				_animated_sprite.play("idle")
-#				player_last_state = STATE.RUN
-#				player_state = STATE.IDLE
-#			# Animation
-#			if player_last_state == STATE.IDLE:
-#				_animated_sprite.play("step")
-#				animation_play_finished = false
-#				player_last_state = STATE.RUN
-#			elif animation_play_finished == true:
-#				_animated_sprite.play("run")
-#				animation_play_finished = false
-#
-#
-#func _on_AnimatedSprite_animation_finished():
-#	animation_play_finished = true
-#	print($AnimatedSprite.animation," anim over ", $IdleTimeout.time_left, animation_play_finished)
-
-

src/playerC/Player.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=86 format=2]
+[gd_scene load_steps=88 format=2]
 
 [ext_resource path="res://src/playerC/Player-KinematicBody2D.gd" type="Script" id=1]
 [ext_resource path="res://src/playerC/states/idle.gd" type="Script" id=2]
@@ -10,6 +10,9 @@
 [ext_resource path="res://src/playerC/states/hurt.gd" type="Script" id=8]
 [ext_resource path="res://src/playerC/Gun.gd" type="Script" id=9]
 [ext_resource path="res://src/playerC/states/fire.gd" type="Script" id=10]
+[ext_resource path="res://src/playerC/states/none.gd" type="Script" id=11]
+[ext_resource path="res://src/components/Hurtbox_Component.tscn" type="PackedScene" id=12]
+[ext_resource path="res://src/state_modifier.gd" type="Script" id=13]
 
 [sub_resource type="StreamTexture" id=75]
 load_path = "res://.import/MegaMan.png-dc2c293e5a0f5d183ee961942ac90e4a.stex"
@@ -399,9 +402,6 @@ animations = [ {
 [sub_resource type="RectangleShape2D" id=74]
 extents = Vector2( 14, 18.5 )
 
-[sub_resource type="RectangleShape2D" id=148]
-extents = Vector2( 11.5, 14.5 )
-
 [node name="Player" type="KinematicBody2D"]
 collision_layer = 2
 script = ExtResource( 1 )
@@ -409,7 +409,7 @@ script = ExtResource( 1 )
 [node name="AnimatedSprite" type="AnimatedSprite" parent="."]
 frames = SubResource( 147 )
 animation = "idle"
-frame = 26
+frame = 1
 playing = true
 flip_h = true
 __meta__ = {
@@ -431,6 +431,9 @@ shape = SubResource( 74 )
 
 [node name="Controllers" type="Node" parent="."]
 
+[node name="move_component" type="Node" parent="Controllers"]
+script = ExtResource( 6 )
+
 [node name="state_machine" type="Node" parent="Controllers"]
 script = ExtResource( 3 )
 starting_state = NodePath("idle")
@@ -439,6 +442,7 @@ starting_state = NodePath("idle")
 script = ExtResource( 2 )
 animation_name = "idle"
 move_speed = 90.0
+transition_state_nodes = [ NodePath("../jump") ]
 jump_node = NodePath("../jump")
 fall_node = NodePath("../fall")
 move_node = NodePath("../move")
@@ -482,17 +486,17 @@ animation_name = "fire"
 timeout_seconds = 1.0
 idle_node = NodePath("../idle")
 
-[node name="move_component" type="Node" parent="Controllers"]
+[node name="attack" type="Node" parent="Controllers/state_machine"]
-script = ExtResource( 6 )
+script = ExtResource( 13 )
+timeout_seconds = 2.0
 
-[node name="Hurtbox" type="Area2D" parent="."]
+[node name="AttackStateMachine" type="Node" parent="Controllers"]
-collision_layer = 16
+script = ExtResource( 3 )
-collision_mask = 128
 
-[node name="CollisionShape2D" type="CollisionShape2D" parent="Hurtbox"]
+[node name="none" type="Node" parent="Controllers/AttackStateMachine"]
-self_modulate = Color( 1, 0, 0, 1 )
+script = ExtResource( 11 )
-position = Vector2( 0, -4 )
+
-shape = SubResource( 148 )
+[node name="Hurtbox_Component" parent="." instance=ExtResource( 12 )]
 
 [node name="Gun" type="Position2D" parent="."]
 physics_interpolation_mode = 1
@@ -509,4 +513,3 @@ width = 2.0
 default_color = Color( 1, 0.607843, 0, 1 )
 
 [connection signal="animation_finished" from="AnimatedSprite" to="." method="_on_AnimatedSprite_animation_finished"]
-[connection signal="area_entered" from="Hurtbox" to="." method="_on_Hurtbox_area_entered"]

src/playerC/states/fire.gd

@@ -10,6 +10,9 @@ func enter() -> void:
 	parent.set_hurtbox(false)
 	state_timeout.start()
 	can_fire = true
+	if modifier_stack_ref.has($"../attack") == false:
+		$"../attack".state_timeout.start()
+		modifier_stack_ref.push_front($"../attack")
 
 func process_input(_event: InputEvent) -> State:
 #	if move_component.get_movement_direction() != 0.0:
@@ -45,3 +48,11 @@ func process_physics(delta: float) -> State:
 	
 	return null
 
+func exit() -> void:
+	for mods in modifier_stack_ref:
+		print(mods.name)
+	
+#	var testmod :StateModifier = StateModifier.new()
+#	testmod.name
+	
+	pass	

src/playerC/states/none.gd

@@ -0,0 +1 @@
+extends State

src/pushdown_state_machine.gd

@@ -0,0 +1,46 @@
+class_name PushdownStateMachine extends Node
+
+export (NodePath) var starting_state
+
+var current_state: State
+var state_stack = []
+
+# Initialize the state machine by giving each child state a reference to the
+# parent object it belongs to and enter the default starting_state.
+func init(parent: KinematicBody2D, animations: AnimatedSprite, move_component) -> void:
+	for child in get_children():
+		child.parent = parent
+		child.animations = animations
+		child.move_component = move_component
+
+	# Initialize to the default state
+	change_state(get_node(starting_state))
+
+# Change to the new state by first calling any exit logic on the current state.
+func change_state(new_state: State) -> void:
+	if current_state:
+		current_state.exit()
+
+	current_state = new_state
+	current_state.enter()
+
+func push_state(new_state: State) -> void:
+	state_stack.push_front(new_state)
+	
+	
+# Pass through functions for the Player to call,
+# handling state changes as needed.
+func process_physics(delta: float) -> void:
+	var new_state = current_state.process_physics(delta)
+	if new_state:
+		change_state(new_state)
+
+func process_input(event: InputEvent) -> void:
+	var new_state = current_state.process_input(event)
+	if new_state:
+		change_state(new_state)
+
+func process_frame(delta: float) -> void:
+	var new_state = current_state.process_frame(delta)
+	if new_state:
+		change_state(new_state)

src/state.gd

@@ -1,13 +1,25 @@
 class_name State
 extends Node
+## Animation and movement state class
+##
+## A state intended to control the movement and animation
+## functions of a KinimaticBody2D node. Initialized with a
+## player, movement node, and kinematicbody2d 
+## I think if we also had modifier states that transfered along with the enter and entrance of nodes, that would be helpful.
+##
+## @WIP
+
 
 export var animation_name: String
 export var move_speed: float = 60
 export var timeout_seconds: float = 0.0
 
 export(Array, String) var animation_sequence
+export(Array, NodePath) var transition_state_nodes
+
 var animation_index: int = 0
 var current_animation_sequence: int = 0
+var modifier_stack_ref: Array # Well this didn't work 
 
 var gravity: int = ProjectSettings.get_setting("physics/2d/default_gravity")
 
@@ -20,6 +32,7 @@ var parent: KinematicBody2D
 var state_timeout: Timer
 
 func _ready():
+	# Only add timout node if timer value was specified.
 	if(timeout_seconds > 0.0):
 		state_timeout = Timer.new()
 		state_timeout.wait_time = timeout_seconds
@@ -30,6 +43,7 @@ func _ready():
 
 func enter() -> void:
 	print(parent.name, " entering State: ", self.name)
+	#modifier_stack_ref = state_modifiers
 	if animation_name != '':
 		animations.play(animation_name)
 	elif animation_sequence.size() > 0:
@@ -54,9 +68,3 @@ func process_frame(_delta: float) -> State:
 
 func process_physics(_delta: float) -> State:
 	return null
-
-#func get_movement_input() -> float:
-#	return move_component.get_movement_direction()
-#
-#func get_jump() -> bool:
-#	return move_component.wants_jump()

src/state_machine.gd

@@ -1,16 +1,20 @@
-extends Node
+class_name StateMachine extends Node
 
 export (NodePath) var starting_state
 
 var current_state: State
+var state_modifiers: Array
 
 # Initialize the state machine by giving each child state a reference to the
 # parent object it belongs to and enter the default starting_state.
 func init(parent: KinematicBody2D, animations: AnimatedSprite, move_component) -> void:
 	for child in get_children():
-		child.parent = parent
+		if child is State:
-		child.animations = animations
+			print("Initializing State Node for ", parent.name, ": ", child.name)
-		child.move_component = move_component
+			child.parent = parent
+			child.animations = animations
+			child.move_component = move_component
+			child.modifier_stack_ref = state_modifiers
 
 	# Initialize to the default state
 	change_state(get_node(starting_state))
@@ -22,6 +26,10 @@ func change_state(new_state: State) -> void:
 
 	current_state = new_state
 	current_state.enter()
+	if(state_modifiers.size() > 0):
+		print("Active Modifiers:")
+		for mods in state_modifiers:
+			print(mods.name)
 	
 # Pass through functions for the Player to call,
 # handling state changes as needed.
@@ -36,6 +44,14 @@ func process_input(event: InputEvent) -> void:
 		change_state(new_state)
 
 func process_frame(delta: float) -> void:
+	# Check the state modifiers for timeouts, and maybe more conditions later
+	# If the modifier is no longer valid, pop it from the stack. 
+	# We could iterate through a whole list of states but I'm not sure i want
+	# states to be that complex. 
+	if state_modifiers.empty() == false:
+		if state_modifiers[-1].state_timeout.time_left == 0:
+			print("Pop State Modifier: ", state_modifiers[-1].name)
+			state_modifiers.pop_back()
 	var new_state = current_state.process_frame(delta)
 	if new_state:
 		change_state(new_state)

src/state_modifier.gd

@@ -0,0 +1,37 @@
+class_name StateModifier
+extends Node
+## State modification
+##
+## A state modifier doesn't have any direct control of a game object. 
+## They are transfered from the enter and exit of other states and 
+## influence the movement or animation of their parent states. 
+## Rather than going full into paralell state machines I hope that this 
+## modifier will be suitable for a basic state machine.
+##
+## @WIP
+
+
+export var animation_name: String
+export var move_speed: float = 60
+export var timeout_seconds: float = 0.0
+
+export(Array, String) var animation_sequence
+export(Array, NodePath) var transition_state_nodes
+var animation_index: int = 0
+var current_animation_sequence: int = 0
+
+var gravity: int = ProjectSettings.get_setting("physics/2d/default_gravity")
+
+#var animation_sequence_timer: Timer
+
+var state_timeout: Timer
+
+func _ready():
+	state_timeout = Timer.new()
+	state_timeout.wait_time = timeout_seconds
+	state_timeout.one_shot = true
+	state_timeout.autostart = false
+	add_child(state_timeout)
+
+func _update():
+	pass