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

11. Detecting Collisions

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Previous episode: 10. Consuming & Regenerating the Food Next episode: 12. Show Game Over Dialog

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You are now able to control a moving Snake. It also grows as it eats the food but one thing that you should also do is prevent the Snake from moving off the screen.

@override
  Widget build(BuildContext context) {
    ...
    return Scaffold(
      body: Container(
        color: Color(0XFFF5BB00),
        child: Stack(
          children: [
            getPlayAreaBorder(),
            ...
          ],
        ),
      ),
    );
  }

bool detectCollision(Offset position) {
    
}

bool detectCollision(Offset position) {
    if (position.dx >= upperBoundX && direction == Direction.right) {
        return true;
    } else if (position.dx <= lowerBoundX && direction == Direction.left) {
        return true;
    } else if (position.dy >= upperBoundY && direction == Direction.down) {
        return true;
    } else if (position.dy <= lowerBoundY && direction == Direction.up) {
        return true;
    }
    return false;
  }

Future<Offset> getNextPosition(Offset position) async {
    Offset nextPosition;

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

    ...

    return nextPosition;
  }