RobustToolbox/Robust.Client/GameObjects/EntitySystems/VelocityDebugSystem.cs

using System.Numerics;
using Robust.Client.Graphics;
using Robust.Client.Player;
using Robust.Client.UserInterface;
using Robust.Client.UserInterface.Controls;
using Robust.Shared.GameObjects;
using Robust.Shared.IoC;
using Robust.Shared.Maths;
using Robust.Shared.Physics.Components;

namespace Robust.Client.GameObjects
{
    public sealed class VelocityDebugSystem : EntitySystem
    {
        [Dependency] private readonly IEyeManager _eyeManager = default!;
        [Dependency] private readonly IPlayerManager _playerManager = default!;
        [Dependency] private readonly TransformSystem _transform = default!;

        internal bool Enabled { get; set; }

        private Label _label = default!;

        public override void Initialize()
        {
            base.Initialize();
            _label = new Label();
            IoCManager.Resolve<IUserInterfaceManager>().StateRoot.AddChild(_label);
        }

        public override void FrameUpdate(float frameTime)
        {
            base.FrameUpdate(frameTime);
            if (!Enabled)
            {
                _label.Visible = false;
                return;
            }

            var player = _playerManager.LocalEntity;

            if (player == null || !EntityManager.TryGetComponent(player.Value, out PhysicsComponent? body))
            {
                _label.Visible = false;
                return;
            }

            var screenPos = _eyeManager.WorldToScreen(_transform.GetWorldPosition(Transform(player.Value)));
            LayoutContainer.SetPosition(_label, screenPos + new Vector2(0, 50));
            _label.Visible = true;

            _label.Text = $"Speed: {body.LinearVelocity.Length():0.00}\nLinear: {body.LinearVelocity.X:0.00}, {body.LinearVelocity.Y:0.00}\nAngular: {body.AngularVelocity}";
        }
    }
}