flame/packages/flame_forge2d/example/lib/tappable_sample.dart

import 'package:flame/components.dart';
import 'package:flame/palette.dart';
import 'package:flame_forge2d/flame_forge2d.dart';
import 'package:flame_forge2d/forge2d_game.dart';
import 'package:forge2d/forge2d.dart';

import 'balls.dart';
import 'boundaries.dart';

class TappableSample extends Forge2DGame with HasTappables {
  TappableSample() : super(zoom: 20, gravity: Vector2(0, -10.0));

  @override
  Future<void> onLoad() async {
    await super.onLoad();
    final boundaries = createBoundaries(this);
    boundaries.forEach(add);
    final center = screenToWorld(camera.viewport.effectiveSize / 2);
    add(TappableBall(center));
  }
}

class TappableBall extends Ball with Tappable {
  TappableBall(Vector2 position) : super(position) {
    originalPaint = BasicPalette.white.paint();
    paint = originalPaint;
  }

  @override
  bool onTapDown(_) {
    body.applyLinearImpulse(Vector2.random() * 1000);
    paint = randomPaint();
    return false;
  }
}