add game state

game/project.godot

@@ -9,6 +9,11 @@
 config_version=4
 
 _global_script_classes=[ {
+"base": "Node",
+"class": "GameState",
+"language": "GDScript",
+"path": "res://src/GameState.gd"
+}, {
 "base": "Node2D",
 "class": "Piece",
 "language": "GDScript",
@@ -20,6 +25,7 @@ _global_script_classes=[ {
 "path": "res://src/Taquin.gd"
 } ]
 _global_script_class_icons={
+"GameState": "",
 "Piece": "",
 "Taquin": ""
 }

game/src/GameState.gd

@@ -0,0 +1,25 @@
+extends Node
+class_name GameState
+
+# https://github.com/GDQuest/godot-demos/blob/master/2018/04-24-finite-state-machine/player_v2/state_machine.gd
+# http://www.gameprogrammingpatterns.com/state.html
+
+enum State { MAIN, WINNING, GAME_OVER }
+var transitions = {
+	State.MAIN : [ State.WINNING ],
+	State.WINNING : [ State.GAME_OVER ],
+	State.GAME_OVER : [ State.MAIN ]
+}
+
+signal state_changed(previous, current)
+
+export(State) var current_state = State.MAIN
+
+func current_state_name() -> String:
+	return State.keys()[current_state]
+
+func transition_to(state):
+	assert(state in transitions[current_state])
+	var previous_state = current_state
+	current_state = state
+	emit_signal("state_changed", previous_state, current_state)

game/src/Main.gd

@@ -2,12 +2,17 @@ extends Control
 
 var blur_amount = 3
 
-enum State {}
-
 func _ready():
 	$ColorRect.visible = false
+	print("Starting state: ", $GameState.current_state_name())
 
-func _on_Taquin_solved():
-	print("Solved!")
-	$ColorRect.visible = true
-	$ColorRect.material.set_shader_param("blur_amount", blur_amount)
+func _on_GameState_state_changed(previous, current):
+	print("GameState: ", $GameState.State.keys()[previous], " -> ", $GameState.State.keys()[current])
+	match current:
+		GameState.State.WINNING:
+			print("Solved!")
+			# TODO: wait for the animation to finish before game over
+			$GameState.transition_to(GameState.State.GAME_OVER)
+		GameState.State.GAME_OVER:
+			$ColorRect.visible = true
+			$ColorRect.material.set_shader_param("blur_amount", blur_amount)

game/src/Main.tscn

@@ -1,7 +1,8 @@
-[gd_scene load_steps=5 format=2]
+[gd_scene load_steps=6 format=2]
 
 [ext_resource path="res://src/Main.gd" type="Script" id=1]
 [ext_resource path="res://src/Taquin.tscn" type="PackedScene" id=2]
+[ext_resource path="res://src/GameState.gd" type="Script" id=3]
 
 [sub_resource type="Shader" id=1]
 code = "shader_type canvas_item;
@@ -49,4 +50,7 @@ text = "New game"
 material = SubResource( 2 )
 anchor_right = 1.0
 anchor_bottom = 1.0
-[connection signal="solved" from="HSplitContainer/Taquin" to="." method="_on_Taquin_solved"]
+
+[node name="GameState" type="Node" parent="."]
+script = ExtResource( 3 )
+[connection signal="state_changed" from="GameState" to="." method="_on_GameState_state_changed"]

game/src/Taquin.gd

@@ -2,8 +2,6 @@ extends Control
 class_name Taquin
 tool
 
-signal solved
-
 var Piece = preload("res://src/Piece.tscn")
 
 export var rows: int = 4
@@ -149,6 +147,8 @@ func move_piece(direction) -> bool:
 	
 	update()
 	if check_solved():
+		var game_state = get_node("/root/Main/GameState") as GameState
+		game_state.transition_to(GameState.State.WINNING)
 		emit_signal("solved")
 	
 	return true