inicia implementacao do joystick

lib/components/joystick/joystick_component.dart

@@ -0,0 +1,100 @@
+import 'dart:ui';
+
+import 'package:flame/components/component.dart';
+import 'package:flame/components/joystick/Joystick_action.dart';
+import 'package:flame/components/joystick/Joystick_directional.dart';
+import 'package:flame/components/mixins/has_game_ref.dart';
+import 'package:flame/game/base_game.dart';
+
+enum JoystickMoveDirectional {
+  MOVE_UP,
+  MOVE_UP_LEFT,
+  MOVE_UP_RIGHT,
+  MOVE_RIGHT,
+  MOVE_DOWN,
+  MOVE_DOWN_RIGHT,
+  MOVE_DOWN_LEFT,
+  MOVE_LEFT,
+  IDLE
+}
+
+class JoystickDirectionalEvent {
+  final JoystickMoveDirectional directional;
+  final double intensity;
+  final double radAngle;
+
+  JoystickDirectionalEvent({
+    this.directional,
+    this.intensity = 0.0,
+    this.radAngle = 0.0,
+  });
+}
+
+enum ActionEvent { DOWN, UP, MOVE }
+
+class JoystickActionEvent {
+  final int id;
+  final double intensity;
+  final double radAngle;
+  final ActionEvent event;
+
+  JoystickActionEvent(
+      {this.id, this.intensity = 0.0, this.radAngle = 0.0, this.event});
+}
+
+abstract class JoystickListener {
+  void joystickChangeDirectional(JoystickDirectionalEvent event);
+  void joystickAction(JoystickActionEvent event);
+}
+
+abstract class JoystickController extends Component with HasGameRef<BaseGame> {
+  final List<JoystickListener> _observers = [];
+
+  void joystickChangeDirectional(JoystickDirectionalEvent event) {
+    _observers.forEach((o) => o.joystickChangeDirectional(event));
+  }
+
+  void joystickAction(JoystickActionEvent event) {
+    _observers.forEach((o) => o.joystickAction(event));
+  }
+
+  void addObserver(JoystickListener listener) {
+    _observers.add(listener);
+  }
+
+  @override
+  bool isHud() => true;
+}
+
+class JoystickComponent extends JoystickController {
+  final List<JoystickAction> actions;
+  final JoystickDirectional directional;
+
+  JoystickComponent({this.actions, this.directional});
+
+  void addAction(JoystickAction action) {
+    if (actions != null && gameRef?.size != null) {
+      action.initialize(gameRef.size, this);
+      actions.add(action);
+    }
+  }
+
+  @override
+  void render(Canvas canvas) {
+    directional?.render(canvas);
+    actions?.forEach((action) => action.render(canvas));
+  }
+
+  @override
+  void update(double t) {
+    directional?.update(t);
+    actions?.forEach((action) => action.update(t));
+  }
+
+  @override
+  void resize(Size size) {
+    directional?.initialize(size, this);
+    actions?.forEach((action) => action.initialize(size, this));
+    super.resize(size);
+  }
+}