simple composable grid context and grid controller, fiend sprite, godotxel addon

nodes/FittingSprite.gd

@@ -0,0 +1,14 @@
+tool
+extends Sprite
+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
+
+func _set_target_size(p_size: Vector2) -> void:
+    target_size = p_size
+    _update_scale()
+
+func _update_scale() -> void:
+    scale = target_size / texture.get_size()

nodes/GridContext.gd

@@ -0,0 +1,13 @@
+extends Node2D
+class_name TK_GridContext
+
+## todo: Cell visualization.
+## todo: Integration of TileMap.
+
+export var cell_size: Vector2 = Vector2(64, 64)
+
+func position_to_cell_position(p_position: Vector2) -> Vector2:
+    return Arithmetic.vector2_mod(global_position - p_position, cell_size)
+
+func is_cell_traversible(p_cell_position: Vector2) -> bool:
+    return true

nodes/GridContext.tscn

@@ -0,0 +1,6 @@
+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://nodes/GridContext.gd" type="Script" id=1]
+
+[node name="GridContext" type="Node2D"]
+script = ExtResource( 1 )

nodes/GridController.gd

@@ -0,0 +1,26 @@
+extends Node
+class_name TK_GridController
+
+## Composable 4-way grid controller.
+## Depends on placement below some Node2D below some GridContext.
+
+signal moved(p_new_cell_position)
+
+func _input(p_event: InputEvent):
+    var direction := InputUtils.input_event_to_4way_direction(p_event)
+    if direction == Vector2.ZERO:
+        return
+
+    var context := _get_grid_context()
+    var cell = context.position_to_cell_position(get_parent().global_position)
+    var new_cell = cell + direction
+    if context.is_cell_traversible(new_cell):
+        # todo: Should we move the outmost node2d?
+        get_parent().position += context.cell_size * direction
+        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/GridController.tscn

@@ -0,0 +1,6 @@
+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://nodes/GridController.gd" type="Script" id=1]
+
+[node name="GridController" type="Node"]
+script = ExtResource( 1 )

nodes/singletons/Arithmetic.gd

@@ -0,0 +1,8 @@
+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))
+
+static func vector2_mod(p_a: Vector2, p_b: Vector2) -> Vector2:
+    return p_a - (p_b * (p_a / p_b).floor())

nodes/singletons/InputUtils.gd

@@ -0,0 +1,13 @@
+extends Node
+
+func input_event_to_4way_direction(p_event: InputEvent) -> Vector2:
+    var result := Vector2.ZERO
+    if p_event.is_action_pressed("move_down"):
+        result.y += 1
+    if p_event.is_action_pressed("move_right"):
+        result.x += 1
+    if p_event.is_action_pressed("move_up"):
+        result.y -= 1
+    if p_event.is_action_pressed("move_left"):
+        result.x -= 1
+    return result