base Context and Controller classes, generalization of context

nodes/4WayController.gd

@@ -0,0 +1,22 @@
+extends TK_Controller
+class_name TK_4WayController
+
+## Composable 4-way grid controller.
+## Depends on placement below some Node2D below some GridContext.
+
+# todo: Network player aware.
+# todo: AI aware.
+
+var _game_object: Node2D
+
+func _enter_tree() -> void:
+    _game_object = get_parent()
+
+func _input(p_event: InputEvent):
+    var direction := InputUtils.input_event_to_4way_direction(p_event)
+    if direction == Vector2.ZERO:
+        return
+
+    var cell = _context.local_position_to_context_position(_game_object.position)
+    var new_cell = cell + direction
+    _context.try_moving(_game_object, cell, new_cell)

nodes/4WayController.tscn

@@ -1,6 +1,6 @@
 [gd_scene load_steps=2 format=2]
 
-[ext_resource path="res://nodes/GridController.gd" type="Script" id=1]
+[ext_resource path="res://nodes/4WayController.gd" type="Script" id=1]
 
 [node name="GridController" type="Node"]
 script = ExtResource( 1 )

nodes/Context.gd

@@ -0,0 +1,17 @@
+extends Node2D
+class_name TK_Context
+
+# todo: Abstract actions.
+# todo: Signal registration of GameObject actions.
+
+func local_position_to_context_position(_p_position: Vector2) -> Vector2:
+    push_error("Abstract class method is unimplemented")
+    return Vector2.ZERO
+
+func is_path_traversible(_p_from: Vector2, _p_to: Vector2) -> bool:
+    push_error("Abstract class method is unimplemented")
+    return false
+
+func try_moving(_p_game_object: Node2D, _p_from: Vector2, _p_to: Vector2) -> bool:
+    push_error("Abstract class method is unimplemented")
+    return false

nodes/Controller.gd

@@ -0,0 +1,13 @@
+extends Node
+class_name TK_Controller
+
+var _context: Node2D
+
+func _enter_tree() -> void:
+    _context = _get_context()
+
+func _get_context() -> Node:
+    var current := self.get_parent().get_parent()
+    while not current is TK_Context:
+        current = current.get_parent()
+    return current

nodes/FittingSprite.gd

@@ -4,7 +4,14 @@ class_name TK_FittingSprite
 
 ## A Sprite that is resized to absolute pixel size, no matter the texture.
 
-export var target_size: Vector2 setget _set_target_size
+const NO_SIZE_SENTINEL = Vector2(-1, -1)
+
+export var target_size: Vector2 = NO_SIZE_SENTINEL setget _set_target_size
+
+# todo: Ask context about preferred sizing if there's any.
+func _enter_tree() -> void:
+    if target_size == NO_SIZE_SENTINEL:
+        self.target_size = texture.get_size()
 
 func _set_target_size(p_size: Vector2) -> void:
     target_size = p_size

nodes/GameObject.tscn

@@ -0,0 +1,3 @@
+[gd_scene format=2]
+
+[node name="GameObject" type="Node2D"]

nodes/GridContext.gd

@@ -1,4 +1,4 @@
-extends Node2D
+extends TK_Context
 class_name TK_GridContext
 
 ## todo: Cell visualization.
@@ -6,15 +6,16 @@ class_name TK_GridContext
 
 export var cell_size: Vector2 = Vector2(64, 64)
 
-func position_to_cell_position(p_position: Vector2) -> Vector2:
+func local_position_to_context_position(p_position: Vector2) -> Vector2:
     return p_position / cell_size
 
-func is_cell_traversible(p_cell_position: Vector2) -> bool:
+func is_path_traversible(p_from: Vector2, p_to: Vector2) -> bool:
+    # todo:
     return true
 
-func try_moving(p_node: Node2D, p_cell_position: Vector2) -> bool:
-    if not is_cell_traversible(p_cell_position):
+func try_moving(p_game_object: Node2D, p_from: Vector2, p_to: Vector2) -> bool:
+    if not is_path_traversible(p_from, p_to):
         return false
     
-    p_node.position = cell_size * p_cell_position
+    p_game_object.position = cell_size * p_to
     return true

nodes/GridController.gd

@@ -1,30 +0,0 @@
-extends Node
-class_name TK_GridController
-
-## Composable 4-way grid controller.
-## Depends on placement below some Node2D below some GridContext.
-
-# todo: Turn-based logic context.
-
-signal moved(p_new_cell_position)
-
-var _grid_context_cache: Node2D
-
-func _enter_tree() -> void:
-    _grid_context_cache = _get_grid_context()
-
-func _input(p_event: InputEvent):
-    var direction := InputUtils.input_event_to_4way_direction(p_event)
-    if direction == Vector2.ZERO:
-        return
-
-    var cell = _grid_context_cache.position_to_cell_position(get_parent().position)
-    var new_cell = cell + direction
-    if _grid_context_cache.try_moving(get_parent(), new_cell):
-        emit_signal("moved", new_cell)
-
-func _get_grid_context() -> Node:
-    var current := self.get_parent().get_parent()
-    while current.name != "GridContext":
-        current = current.get_parent()
-    return current

nodes/singletons/Arithmetic.gd

@@ -2,7 +2,7 @@ extends Node
 class_name TK_Arithmetic
 
 static func float_mod(p_a: float, p_b: float) -> float:
-    return p_a - (p_b * floor(p_a / p_b))
+    return p_a - p_b * floor(p_a / p_b)
 
 static func vector2_mod(p_a: Vector2, p_b: Vector2) -> Vector2:
-    return p_a - (p_b * (p_a / p_b).floor())
+    return p_a - p_b * (p_a / p_b).floor()

nodes/singletons/InputUtils.gd

@@ -1,6 +1,6 @@
 extends Node
 
-func input_event_to_4way_direction(p_event: InputEvent) -> Vector2:
+func input_event_to_8way_direction(p_event: InputEvent) -> Vector2:
     var result := Vector2.ZERO
     if p_event.is_action_pressed("move_down"):
         result.y += 1
@@ -11,3 +11,15 @@ func input_event_to_4way_direction(p_event: InputEvent) -> Vector2:
     if p_event.is_action_pressed("move_left"):
         result.x -= 1
     return result
+
+func input_event_to_4way_direction(p_event: InputEvent) -> Vector2:
+    if p_event.is_action_pressed("move_down") and not p_event.is_action_pressed("move_up"):
+        return Vector2.DOWN
+    elif p_event.is_action_pressed("move_up") and not p_event.is_action_pressed("move_down"):
+        return Vector2.UP
+    elif p_event.is_action_pressed("move_left") and not p_event.is_action_pressed("move_right"):
+        return Vector2.LEFT
+    elif p_event.is_action_pressed("move_right") and not p_event.is_action_pressed("move_left"):
+        return Vector2.RIGHT
+    else:
+        return Vector2.ZERO