Ramakrishna's Code Project Screen Saver

using System;

namespace CP.Apps.ScreenSaver.Effects
{
	public enum MovementDirection
	{
		Up = 0,
		Down = 1,
		Left = 2,
		Right = 3
	}

	public delegate void ComputeMovementDelegate(ref int x, ref int y, int step);

	public class Movement
	{
		public static void GetImageSizeForMovement(ref int width, ref int height, int step, MovementDirection dir)
		{
			switch(dir)
			{
				case MovementDirection.Down:
				case MovementDirection.Up:
					height += step;
					break;
				default:
					width += step;
					break;
			}
		}

		public static void GetImagePosForMovement(ref int x, ref int y, int step, MovementDirection dir)
		{
			switch(dir)
			{
				case MovementDirection.Down:
					y += step;
					break;
				case MovementDirection.Right:
					x += step;
					break;
			}
		}
	}
}