SlowDown.cs

using System;
using GTA;
using GTA.Native;
using System.Windows.Forms;

namespace Chaos
{
	enum Speed
	{
		Normal,
		Slow1,
		Slow2,
		Slow3,
	}

	public class SlowDown : Script
	{
		Speed speed = Speed.Normal;

		public SlowDown()
		{
			this.KeyDown += OnKeyDown;
		}

		private void OnKeyDown(object sender, KeyEventArgs e)
		{
			Speed? update = null;

			if (e.KeyCode == Keys.K)
			{
				switch (speed)
				{
					case Speed.Normal:
						break;
					case Speed.Slow1:
						update = Speed.Normal;
						break;
					case Speed.Slow2:
						update = Speed.Slow1;
						break;
					case Speed.Slow3:
						update = Speed.Slow2;
						break;
				}
			}
			
			if (e.KeyCode == Keys.J)
			{
				switch (speed)
				{
					case Speed.Normal:
						update = Speed.Slow1;
						break;
					case Speed.Slow1:
						update = Speed.Slow2;
						break;
					case Speed.Slow2:
						update = Speed.Slow3;
						break;
					case Speed.Slow3:
						break;
				}
			}

			if (update.HasValue)
			{
				speed = update.Value;
				float scale = 1.0f;

				switch (speed)
				{
					case Speed.Normal:
						break;
					case Speed.Slow1:
						scale = 0.5f;
						break;
					case Speed.Slow2:
						scale = 0.25f;
						break;
					case Speed.Slow3:
						scale = 0.125f;
						break;
				}

				UI.ShowSubtitle("Speed: " + scale + "X");
				Function.Call(Hash.SET_TIME_SCALE, scale);
			}
		}
	}
}