How to Create a 2D Snake Game in Flutter

Jan 17 2023 Dart 2.17, Flutter 3.0, Android Studio or VS Code

Part 1: How to Create a 2D Snake Game in Flutter

12. Show Game Over Dialog

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Previous episode: 11. Detecting Collisions Next episode: 13. Restarting the Game

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Add detectCollision to the getNextPosition method.

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In this episode, you will be using the provided showGameOverDialog method to display a game-over dialog to the user when the Snake collides with the play-area boundaries. The showGameOverDialog method is provided as part of the starter project.

Offset getNextPosition(Offset position) {
    ...
    if (detectCollision(position) == true) {
        if (timer != null && timer.isActive) timer.cancel();
        showGameOverDialog(); // Add this
        return position;
    }
    ...
    return nextPosition;
}

Future<Offset> getNextPosition(Offset position) async {
    ...

    if (detectCollision(position) == true) {
      if (timer != null && timer.isActive) timer.cancel();
      await Future.delayed(Duration(milliseconds: 500), () => showGameOverDialog());
      return position;
    }
    ...
}

void draw() async {
    ...
    // Update this
    positions[0] = await getNextPosition(positions[0]);
}