Vtj.Contest.Race.RaceLevel.PreUpdate C# (CSharp) Method

        protected override void PreUpdate(CanvasContext2D context)
        {
            // Draw background
            context.DrawImage(_backgroundImage, 0, 0);

            switch (Status)
            {
                case RaceStatus.Running:
                    // Handle left and right turns
                    if (Speed > 0)
                    {
                        float increment = (60 - Math.Max(Speed, 20)) / 80;

                        if (Left)
                        {
                            Shift += increment * DeltaTime;
                            CarSystem.CarObject.CurrentAnimation = Down ? "b-Left" : "Left";
                        }
                        if (Right)
                        {
                            Shift -= increment * DeltaTime;
                            CarSystem.CarObject.CurrentAnimation = Down ? "b-Right" : "Right";
                        }
                    }

                    if (!(Left ^ Right)) CarSystem.CarObject.CurrentAnimation = Down ? "b-Forward" : "Forward";

                    // Handle acceleration, braking and inertia
                    if (Down) Speed -= 0.4f;
                    else if (Up) Speed += 0.3f;
                    else Speed -= 0.1f;

                    if (Up) _rpm += 40;
                    else _rpm -= 40;
                    if (_rpm > 4500) _rpm = 4500;
                    else if (_rpm < 200) _rpm = 200;

                    // When driving off the road
                    if (Math.Abs(Shift) > 350)
                    {
                        Speed *= 0.95f;

                        if (Math.Abs(Shift) > 450)
                            Shift = (Shift / Math.Abs(Shift)) * 450;
                    }
                    break;

                case RaceStatus.Win:
                case RaceStatus.Fail:
                    Speed -= 1;
                    _rpm -= 40;
                    break;

                case RaceStatus.Crashing:
                    Speed -= 0.3f;
                    Shift -= Shift * DeltaTime / 1000;
                    break;
            }

            // Speed capping
            if (Speed > MaxSpeed) Speed = MaxSpeed;
            if (Speed < 0) Speed = 0;

            // Calculating new position
            Position += Speed * DeltaTime;

            // Drift in turns
            Shift += Curve * Speed * 150;

            if (Position >= RoadLength && Status == RaceStatus.Running)
            {
                _music.Pause();
                Status = RaceStatus.Win;
                CarSystem.CarObject.StartAnimation("Skid");
                ShowMessage(_winMessage);
                RemoveSystem(_engineSoundSystem);
                RemoveSystem(_npcSystem);

                int timeLeft = Math.Floor(TimeLeft / 1000);
                CurrentGame.Score += 1000 + timeLeft * 500;

                //if (!_practice)
                //{
                //    pendingTimers.Add(
                //    Window.SetTimeout(delegate()
                //    {
                //        UpdateMessage("<p>Time Left: " + timeLeft + "</p>");
                //    }, 1500));

                //    pendingTimers.Add(
                //    Window.SetTimeout(delegate()
                //    {
                //        UpdateMessage("<p>Score: " + CurrentGame.Score + "</p>");
                //    }, 2500));
                //}

                pendingTimers.Add(
                Window.SetTimeout(delegate()
                {
                    UpdateMessage("<p>Press a key to continue.</p>");
                }, 3000));
            }
        }