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326 lines
8.2 KiB
Markdown
326 lines
8.2 KiB
Markdown
# 7. Adding Menus
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To add menus to the game, we will leverage Flame's built-in
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[overlay](../../flame/overlays.md) system.
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## Main Menu
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In the `lib/overlays` folder, create `main_menu.dart` and add the following code:
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```dart
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import 'package:flutter/material.dart';
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import '../ember_quest.dart';
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class MainMenu extends StatelessWidget {
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// Reference to parent game.
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final EmberQuestGame game;
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const MainMenu({super.key, required this.game});
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@override
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Widget build(BuildContext context) {
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const blackTextColor = Color.fromRGBO(0, 0, 0, 1.0);
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const whiteTextColor = Color.fromRGBO(255, 255, 255, 1.0);
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return Material(
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color: Colors.transparent,
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child: Center(
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child: Container(
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padding: const EdgeInsets.all(10.0),
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height: 250,
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width: 300,
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decoration: const BoxDecoration(
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color: blackTextColor,
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borderRadius: const BorderRadius.all(
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Radius.circular(20),
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),
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),
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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const Text(
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'Ember Quest',
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style: TextStyle(
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color: whiteTextColor,
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fontSize: 24,
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),
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),
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const SizedBox(height: 40),
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SizedBox(
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width: 200,
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height: 75,
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child: ElevatedButton(
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onPressed: () {
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game.overlays.remove('MainMenu');
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},
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style: ElevatedButton.styleFrom(
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backgroundColor: whiteTextColor,
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),
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child: const Text(
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'Play',
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style: TextStyle(
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fontSize: 40.0,
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color: blackTextColor,
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),
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),
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),
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),
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const SizedBox(height: 20),
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const Text(
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'''Use WASD or Arrow Keys for movement.
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Space bar to jump.
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Collect as many stars as you can and avoid enemies!''',
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textAlign: TextAlign.center,
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style: TextStyle(
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color: whiteTextColor,
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fontSize: 14,
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),
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),
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],
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),
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),
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),
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);
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}
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}
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```
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This is a pretty self-explanatory file that just uses standard Flutter widgets to display
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information and provide a `Play` button. The only Flame-related line is
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`game.overlays.remove('MainMenu');` which simply removes the overlay so the user can play the
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game. It should be noted that the user can technically move Ember while this is displayed, but
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trapping the input is outside the scope of this tutorial as there are multiple ways this can be
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accomplished.
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## Game Over Menu
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Next, create a file called `lib/overlays/game_over.dart` and add the following code:
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```dart
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import 'package:flutter/material.dart';
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import '../ember_quest.dart';
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class GameOver extends StatelessWidget {
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// Reference to parent game.
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final EmberQuestGame game;
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const GameOver({super.key, required this.game});
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@override
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Widget build(BuildContext context) {
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const blackTextColor = Color.fromRGBO(0, 0, 0, 1.0);
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const whiteTextColor = Color.fromRGBO(255, 255, 255, 1.0);
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return Material(
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color: Colors.transparent,
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child: Center(
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child: Container(
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padding: const EdgeInsets.all(10.0),
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height: 200,
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width: 300,
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decoration: const BoxDecoration(
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color: blackTextColor,
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borderRadius: const BorderRadius.all(
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Radius.circular(20),
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),
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),
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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const Text(
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'Game Over',
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style: TextStyle(
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color: whiteTextColor,
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fontSize: 24,
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),
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),
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const SizedBox(height: 40),
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SizedBox(
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width: 200,
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height: 75,
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child: ElevatedButton(
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onPressed: () {
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game.reset();
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game.overlays.remove('GameOver');
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},
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style: ElevatedButton.styleFrom(
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backgroundColor: whiteTextColor,
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),
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child: const Text(
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'Play Again',
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style: TextStyle(
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fontSize: 28.0,
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color: blackTextColor,
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),
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),
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),
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),
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],
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),
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),
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),
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);
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}
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}
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```
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As with the Main Menu, this is all standard Flutter widgets except for the call to remove the
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overlay and also the call to `game.reset()` which we will create now.
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Open `lib/ember_quest.dart` and add / update the following code:
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```dart
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@override
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Future<void> onLoad() async {
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await images.loadAll([
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'block.png',
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'ember.png',
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'ground.png',
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'heart_half.png',
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'heart.png',
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'star.png',
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'water_enemy.png',
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]);
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camera.viewfinder.anchor = Anchor.topLeft;
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initializeGame(true);
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}
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void initializeGame(bool loadHud) {
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// Assume that size.x < 3200
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final segmentsToLoad = (size.x / 640).ceil();
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segmentsToLoad.clamp(0, segments.length);
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for (var i = 0; i <= segmentsToLoad; i++) {
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loadGameSegments(i, (640 * i).toDouble());
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}
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_ember = EmberPlayer(
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position: Vector2(128, canvasSize.y - 128),
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);
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add(_ember);
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if (loadHud) {
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add(Hud());
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}
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}
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void reset() {
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starsCollected = 0;
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health = 3;
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initializeGame(false);
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}
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```
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You may notice that we have added a parameter to the `initializeGame` method which allows us to
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bypass adding the HUD to the game. This is because in the coming section, when Ember's health drops
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to 0, we will wipe the game, but we do not need to remove the HUD, as we just simply need to reset
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the values using `reset()`.
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## Displaying the Menus
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To display the menus, add the following code to `lib/main.dart`:
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```dart
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void main() {
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runApp(
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GameWidget<EmberQuestGame>.controlled(
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gameFactory: EmberQuestGame.new,
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overlayBuilderMap: {
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'MainMenu': (_, game) => MainMenu(game: game),
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'GameOver': (_, game) => GameOver(game: game),
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},
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initialActiveOverlays: const ['MainMenu'],
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),
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);
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}
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```
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If the menus did not auto-import, add the following:
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```dart
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import 'overlays/game_over.dart';
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import 'overlays/main_menu.dart';
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```
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If you run the game now, you should be greeted with the Main Menu overlay. Pressing play will
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remove it and allow you to start playing the game.
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### Health Check for Game Over
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Our last step to finish Ember Quest is to add a game-over mechanism. This is fairly simple but
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requires us to place similar code in all of our components. So let's get started!
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In `lib/actors/ember.dart`, in the `update` method, add the following:
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```dart
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// If ember fell in pit, then game over.
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if (position.y > game.size.y + size.y) {
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game.health = 0;
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}
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if (game.health <= 0) {
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removeFromParent();
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}
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```
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In `lib/actors/water_enemy.dart`, in the `update` method update the following code:
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```dart
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if (position.x < -size.x || game.health <= 0) {
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removeFromParent();
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}
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```
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In `lib/objects/ground_block.dart`, in the `update` method update the following code:
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```dart
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if (game.health <= 0) {
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removeFromParent();
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}
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```
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In `lib/objects/platform_block.dart`, in the `update` method update the following code:
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```dart
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if (position.x < -size.x || game.health <= 0) {
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removeFromParent();
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}
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```
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In `lib/objects/star.dart`, in the `update` method update the following code:
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```dart
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if (position.x < -size.x || game.health <= 0) {
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removeFromParent();
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}
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```
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Finally, in `lib/ember_quest.dart`, add the following `update` method:
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```dart
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@override
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void update(double dt) {
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if (health <= 0) {
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overlays.add('GameOver');
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}
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super.update(dt);
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}
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```
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## Congratulations
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You made it! You have a working Ember Quest. Press the button below to see what the resulting code
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looks like or to play it live.
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```{flutter-app}
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:sources: ../tutorials/platformer/app
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:show: popup code
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```
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