Your First Flutter Flame Game

Mar 6 2024 · Dart 3, Flutter 3.10.1, Android Studio 2021.3.1 or higher, Visual Studo Code 1.7.4 or higher

Part 3: Collision Detection & Overlays

18. Make a Game Menu

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Previous episode: 17. Add a Heads-Up Display Next episode: 19. Challenge: Create a Game Over Overlay

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Notes: 18. Make a Game Menu

Check out Flame’s documentation about overlays.

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The first thing a player sees in any game is a menu.

Demo

Time to create the game menu.

MainMenu

Let’s start with a basic stateless widget.

class MainMenu extends StatelessWidget {
}

static const String overlayName = 'MainMenu';

// Reference to parent game.
final MeteormaniaGame game;

const MainMenu({super.key, required this.game});

return Material()

color: Colors.transparent,
child: Center(
  child: Container(
    padding: const EdgeInsets.all(16.0),
    height: 250,
  ),
),

BoxDecoration(
  color: const Color.fromRGBO(255, 255, 255, 0.15),
  border: Border.all(
    color: Colors.white,
    width: 4,
  ),
  borderRadius: const BorderRadius.all(
    Radius.circular(20),
  ),
),

const Text(
  'Meteormania',
  style: TextStyle(
    fontFamily: 'PressStart2P',
    color: Colors.white,
    fontSize: 24,
  ),
),

const SizedBox(height: 48),

onPressed: () {
  game.overlays.remove(overlayName);
  game.initializeGame();
},

Saucer, Spaceship, Meteorite, Bullet

Now, you’ll have to check on the different components to see if the game is over so that they only appear when a new game has started.

if (game.manager.isGameOver) {
  removeFromParent();
}

if (game.manager.isGameOver) {
  removeFromParent();
}

if (game.manager.isGameOver) {
  removeFromParent();
}

if (game.manager.isGameOver) {
  removeFromParent();
}

MeteormaniaGame

Now, in MeteormaniaGame you’ll also have to check if the game is over to re-add the overlay if the player’s spaceship was hit. Add an if check on spaceshipHit.

if (manager.isGameOver) {
  overlays.add(MainMenu.overlayName);
}

Main

As the final step, change main to a controlled GameWidget. This allows you to handle the game and also overlays built as a widget.

GameWidget<MeteormaniaGame>.controlled(
  gameFactory: MeteormaniaGame.new,
  overlayBuilderMap: {
    MainMenu.overlayName: (_, game) => MainMenu(game: game),
  },
  initialActiveOverlays: const [MainMenu.overlayName],
),