Add new "World Coordinate" types.

These types provide fixed-point representations of distances, angles,
positions, vectors, and rotations in 3d space.

WAngle (and WRot) represents 360 degrees in 1024 units.
WRange (and WPos, WVec) represents 1 cell in 1024 units.

Distance types in yaml can be written as <cell>c<subcell>, e.g. "4c512" for 4.5 cells.

OpenRA.FileFormats/WRange.cs

@@ -0,0 +1,72 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2013 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System;
+using System.Drawing;
+
+namespace OpenRA
+{
+	/// <summary>
+	/// 1d world distance - 1024 units = 1 cell.
+	/// </summary>
+	public struct WRange
+	{
+		public readonly int Range;
+
+		public WRange(int r) { Range = r; }
+		public static readonly WRange Zero = new WRange(0);
+
+		public static WRange operator +(WRange a, WRange b) { return new WRange(a.Range + b.Range); }
+		public static WRange operator -(WRange a, WRange b) { return new WRange(a.Range - b.Range); }
+		public static WRange operator -(WRange a) { return new WRange(-a.Range); }
+
+		public static bool operator ==(WRange me, WRange other) { return (me.Range == other.Range); }
+		public static bool operator !=(WRange me, WRange other) { return !(me == other); }
+
+		public static bool TryParse(string s, out WRange result)
+		{
+			s = s.ToLowerInvariant();
+			var components = s.Split('c');
+			int cell = 0;
+			int subcell = 0;
+			result = WRange.Zero;
+
+			switch (components.Length)
+			{
+			case 2:
+				if (!int.TryParse(components[0], out cell) ||
+				    !int.TryParse(components[1], out subcell))
+					return false;
+				break;
+			case 1:
+				if (!int.TryParse(components[0], out subcell))
+					return false;
+				break;
+			default: return false;
+			}
+
+			result = new WRange(1024*cell + subcell);
+			return true;
+		}
+
+		public override int GetHashCode() { return Range.GetHashCode(); }
+
+		public override bool Equals(object obj)
+		{
+			if (obj == null)
+				return false;
+
+			WRange o = (WRange)obj;
+			return o == this;
+		}
+
+		public override string ToString() { return "{0}".F(Range); }
+	}
+}