Pong/Scripts/Managers/ScalingManager.cs

namespace Pong.Scripts.Managers;

public partial class ScalingManager : Node
{
    private HFlowContainer _score;
    private RigidBody2D _paddle;
    private CharacterBody2D _ball;

    private Area2D _leftWall;
    private Area2D _rightWall;
    private StaticBody2D _topWall;
    private StaticBody2D _bottomWall;

    private RigidBody2D _enemy;

    private Vector2I _gameResolution;
    private Vector2 _edgePosition;

    public override void _EnterTree()
    {
        GetNodes();
		GetTree().Root.SizeChanged += AdaptToGameResolution;
		AdaptToGameResolution();
    }

    public override void _ExitTree()
    {
		GetTree().Root.SizeChanged -= AdaptToGameResolution;
    }

    private void GetNodes()
    {
        _score = GetNode<HFlowContainer>("../Score");
        _paddle = GetNode<RigidBody2D>("../Paddle");
        _ball = GetNode<CharacterBody2D>("../Ball");

        _leftWall = GetNode<Area2D>("../Walls/Left");
        _rightWall = GetNode<Area2D>("../Walls/Right");
        _topWall = GetNode<StaticBody2D>("../Walls/Top");
        _bottomWall = GetNode<StaticBody2D>("../Walls/Bottom");

        _enemy = GetNode<RigidBody2D>("../Enemy");
    }

    private void AdaptToGameResolution()
    {
        _gameResolution = DisplayServer.WindowGetSize();
        _edgePosition = CalculateEdgePosition(_gameResolution);

        SetWallPosition(_edgePosition);
        _score.Position = new Vector2(-_edgePosition.X + 30, -_edgePosition.Y + 30);
    }

    private static Vector2 CalculateEdgePosition(Vector2 resolution)
    {
        return new Vector2(resolution.X / 2, resolution.Y / 2);
    }

    private void SetWallPosition(Vector2 edgePosition)
    {
        var xSize = edgePosition.X - Constants.WallSizeExtents;
        var ySize = edgePosition.Y - Constants.WallSizeExtents;

        _leftWall.Position = new Vector2(-xSize, 0);
        _rightWall.Position = new Vector2(xSize, 0);
        _topWall.Position = new Vector2(0, -ySize);
        _bottomWall.Position = new Vector2(0, ySize);

        _leftWall.Scale = _leftWall.Scale with { Y = _gameResolution.Y };
        _rightWall.Scale = _rightWall.Scale with { Y = _gameResolution.Y };
        _topWall.Scale = _topWall.Scale with { X = _gameResolution.X - 60 };
        _bottomWall.Scale = _bottomWall.Scale with { X = _gameResolution.X - 60 };
    }
}