feat: add player-selectable array size

The player can now select the length of the level by changing it on the
level selection screen.

Author: danielzting

models/array_model.gd

@@ -6,11 +6,13 @@ signal removed(i)
 signal swapped(i, j)
 signal sorted(i, j)
 
+const DEFAULT_SIZE = 16
+
 var _array = []
 var size = 0 setget , get_size
 var biggest = null
 
-func _init(size=16):
+func _init(size=DEFAULT_SIZE):
     """Randomize the array."""
     for i in range(1, size + 1):
         _array.append(i)

scripts/levels.gd

@@ -11,7 +11,8 @@ const MAX_WAIT = 4
 const MIN_SIZE = 8
 const MAX_SIZE = 128
 
-var _level = LEVELS[0].new(ArrayModel.new())
+var _level = LEVELS[0].new(ArrayModel.new(
+    GlobalScene.get_param("size", ArrayModel.DEFAULT_SIZE)))
 
 func _ready():
     for level in LEVELS:
@@ -54,7 +55,9 @@ func _on_Button_focus_entered(size=_level.array.size):
     $Preview/Display.add_child(ArrayView.new(_level))
 
 func _input(event):
-    if event.is_action_pressed("faster"):
+    if event.is_action_pressed("ui_cancel"):
+        GlobalScene.change_scene("res://scenes/menu.tscn")
+    elif event.is_action_pressed("faster"):
         $Timer.wait_time = max(MIN_WAIT, $Timer.wait_time / 2)
     elif event.is_action_pressed("slower"):
         $Timer.wait_time = min(MAX_WAIT, $Timer.wait_time * 2)
@@ -64,7 +67,8 @@ func _input(event):
         _on_Button_focus_entered(max(MIN_SIZE, _level.array.size / 2))
 
 func _on_Button_pressed(level):
-    GlobalScene.change_scene("res://scenes/play.tscn", {"level": level})
+    GlobalScene.change_scene("res://scenes/play.tscn",
+        {"level": level, "size": _level.array.size})
 
 func _get_level(name):
     for level in LEVELS:

scripts/menu.gd

@@ -16,3 +16,7 @@ func _on_Credits_pressed():
 
 func _on_Timer_timeout():
     _level.next(null)
+
+func _input(event):
+    if event.is_action_pressed("ui_cancel"):
+        get_tree().quit()

scripts/play.gd

@@ -1,9 +1,11 @@
 extends VBoxContainer
 
 var _start_time = -1
+var _level = GlobalScene.get_param(
+    "level", preload("res://scripts/levels.gd").LEVELS[0])
 
 func _ready():
-    $HUDBorder/HUD/Level.text = GlobalScene.get_param("level").NAME
+    $HUDBorder/HUD/Level.text = _level.NAME
 
 func _process(delta):
     if _start_time >= 0:
@@ -12,13 +14,18 @@ func _process(delta):
 func _on_Timer_timeout():
     _start_time = OS.get_ticks_msec()
     $DisplayBorder/Label.queue_free() # Delete ready text
-    var level = GlobalScene.get_param("level").new(ArrayModel.new())
+    var level = _level.new(ArrayModel.new(
+        GlobalScene.get_param("size", ArrayModel.DEFAULT_SIZE)))
     level.connect("done", self, "_on_Level_done")
     $DisplayBorder.add_child(ArrayView.new(level))
 
 func get_score():
     return stepify((OS.get_ticks_msec() - _start_time) / 1000.0, 0.001)
 
+func _input(event):
+    if event.is_action_pressed("ui_cancel"):
+        _on_Button_pressed("levels")
+
 func _on_Level_done():
     var restart = Button.new()
     restart.text = "RESTART LEVEL"
@@ -43,4 +50,4 @@ func _on_Level_done():
 
 func _on_Button_pressed(scene):
     GlobalScene.change_scene("res://scenes/" + scene + ".tscn",
-        {"level": GlobalScene.get_param("level")})
+        {"level": _level, "size": GlobalScene.get_param("size")})

scripts/scene.gd

@@ -10,7 +10,7 @@ func change_scene(next_scene, params=null):
     _params = params
     get_tree().change_scene(next_scene)
 
-func get_param(name):
+func get_param(name, default=null):
     if _params != null and _params.has(name):
         return _params[name]
-    return null
+    return default