add DefaultPickDelegate

thermion_dart/lib/src/input/input.dart

@@ -3,4 +3,5 @@ library;
 export 'src/input_handler.dart';
 export 'src/delegates.dart';
 export 'src/delegate_gesture_handler.dart';
+export 'src/implementations/default_pick_delegate.dart';
 export 'src/implementations/third_person_camera_delegate.dart';

thermion_dart/lib/src/input/src/implementations/default_pick_delegate.dart

@@ -0,0 +1,13 @@
+import 'package:thermion_dart/thermion_dart.dart';
+import 'package:vector_math/vector_math_64.dart';
+
+class DefaultPickDelegate extends PickDelegate {
+  final ThermionViewer viewer;
+
+  const DefaultPickDelegate(this.viewer);
+
+  @override
+  void pick(Vector2 location) {
+    viewer.pick(location.x.toInt(), location.y.toInt());
+  }
+}