feat: Add TiledObjectHealpers extension on TiledObject (#3032)

This PR adds an extension on `TiledObject` to allow getting the object's
`position` and `size` as `Vector2` objects.

---------

Co-authored-by: Lukas Klingsbo <me@lukas.fyi>

packages/flame_tiled/lib/flame_tiled.dart

@@ -2,6 +2,7 @@ library flame_tiled;
 
 export 'package:tiled/tiled.dart';
 
+export 'src/extensions.dart';
 export 'src/flame_tsx_provider.dart';
 export 'src/renderable_tile_map.dart';
 export 'src/simple_flips.dart';

packages/flame_tiled/lib/src/extensions.dart

@@ -0,0 +1,12 @@
+import 'package:flame/components.dart';
+import 'package:flame_tiled/flame_tiled.dart';
+
+/// This extension adds some helpers for [TiledObject] that make it easier to
+/// use it with Flame.
+extension TiledObjectHelpers on TiledObject {
+  /// Returns the position of this tiled object as a Vector2.
+  Vector2 get position => Vector2(x, y);
+
+  /// Returns the size of this tiled object as a Vector2.
+  Vector2 get size => Vector2(width, height);
+}

packages/flame_tiled/test/extensions_test.dart

@@ -0,0 +1,32 @@
+import 'package:flame_tiled/flame_tiled.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  group('TiledObjectHelpers', () {
+    test('position returns correct values', () {
+      final tiledObject = TiledObject(id: 0);
+
+      expect(tiledObject.position.x, 0);
+      expect(tiledObject.position.y, 0);
+
+      tiledObject.x = 26;
+      tiledObject.y = 83;
+
+      expect(tiledObject.position.x, 26);
+      expect(tiledObject.position.y, 83);
+    });
+
+    test('size returns correct values', () {
+      final tiledObject = TiledObject(id: 0);
+
+      expect(tiledObject.size.x, 0);
+      expect(tiledObject.size.y, 0);
+
+      tiledObject.width = 59;
+      tiledObject.height = 42;
+
+      expect(tiledObject.size.x, 59);
+      expect(tiledObject.size.y, 42);
+    });
+  });
+}