Merged in better-communication (pull request #49)

Better communication

Shogi.Domain/Pathing/Path.cs

@@ -0,0 +1,45 @@
+using Shogi.Domain.Pieces;
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Numerics;
+
+namespace Shogi.Domain.Pathing
+{
+	[DebuggerDisplay("{Direction} - {Distance}")]
+	public class Path
+	{
+		public Vector2 Direction { get; }
+		public Distance Distance { get; }
+		public Path(Vector2 direction, Distance distance = Distance.OneStep)
+		{
+			Direction = direction;
+			Distance = distance;
+		}
+
+		public Path Invert() => new(Vector2.Negate(Direction), Distance);
+	}
+
+	public static class PathExtensions
+	{
+		public static Path GetNearestPath(this IEnumerable<Path> paths, Vector2 start, Vector2 end)
+		{
+			if (!paths.DefaultIfEmpty().Any())
+			{
+				throw new ArgumentException("No paths to get nearest path from.");
+			}
+			var shortestPath = paths.First();
+			foreach (var path in paths.Skip(1))
+			{
+				var distance = Vector2.Distance(start + path.Direction, end);
+				var shortestDistance = Vector2.Distance(start + shortestPath.Direction, end);
+				if (distance < shortestDistance)
+				{
+					shortestPath = path;
+				}
+			}
+			return shortestPath;
+		}
+	}
+}