Pong/Scripts/Objects/Paddle.cs

namespace Pong.Scripts.Objects;

public partial class Paddle : RigidBody2D
{
	[Export] private double _moveSpeed;
	
	private double _verticalInput;
	private readonly StringName _paddleUp = "paddle_up";
	private readonly StringName _paddleDown = "paddle_down";

	/// <summary>
	/// property that multiples the moveSpeed by the <see cref="Constants.Meter">Meter</see> constant.
	/// </summary>
	private double MoveSpeed => _moveSpeed * Constants.Meter;

	public override void _Process(double delta)
	{
		_verticalInput = GetVerticalInput();
	}

	public override void _PhysicsProcess(double delta)
	{
		LinearVelocity = Vector2.Up * MoveSpeed * _verticalInput;
	}

	/// <summary>
	/// a method that returns a number that represents input on the vertical axis.
	/// </summary>
	/// <returns>1 for up, -1 for down, 0 for nothing.</returns>
	private double GetVerticalInput()
	{
		if (Input.IsActionPressed(_paddleUp))
		{
			return 1;
		}

		if (Input.IsActionPressed(_paddleDown))
		{
			return -1;
		}

		return 0;
	}
}