Pathwalker-Klasse (Blatt 7)

src/Pathwalker.cs

@@ -0,0 +1,70 @@
+using System;
+using System.Runtime.Serialization;
+using System.Collections.Generic;
+
+namespace WorldOfPeacecraft
+{
+	class Pathwalker
+	{
+		private LinkedList<Coordinate> Coords;
+
+		public void Stop()
+		{
+			Coords = null;
+		}
+
+		public string NextStep ()
+		{
+			if (Coords == null) {
+				throw new PathwalkerException ("There are no coordinates set");
+			}
+			if (Coords.Count < 2) {
+				throw new PathwalkerException ("There are no more steps to take");
+			}
+			Coordinate src = Coords.First.Value;
+			Coords.RemoveFirst ();
+			Coordinate dst = Coords.First.Value;
+			int distance = Math.Abs (src.X - dst.X) + Math.Abs (src.Y - dst.Y);
+			if (distance > 1) {
+				throw new PathwalkerException ("The distance between (" + src.X + "|" + src.Y + ") and (" + dst.X + "|" + dst.Y + ") is grater than 1");
+			}
+			string command;
+			if (src.X > dst.X) {
+				command = "mv:dwn";
+			} else if (src.X < dst.X) {
+				command = "mv:up";
+			} else if (src.Y > dst.Y) {
+				command = "mv:lft";
+			} else if (src.Y < dst.Y) {
+				command = "mv:rgt";
+			} else {
+				command = NextStep ();
+			}
+			return command;
+		}
+
+		public void SetCoords(LinkedList<Coordinate> coords)
+		{
+			this.Coords = coords;
+		}
+	}
+
+	public class PathwalkerException : Exception
+	{
+		public PathwalkerException () : base()
+		{
+		}
+
+		public PathwalkerException (string message) : base(message)
+		{
+		}
+
+		public PathwalkerException (SerializationInfo info, StreamingContext context) : base(info, context)
+		{
+		}
+
+		public PathwalkerException (string message, Exception innerException) : base(message, innerException)
+		{
+		}
+	}
+}