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/WPos.cs

@@ -0,0 +1,50 @@
+#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>
+	/// 3d World position - 1024 units = 1 cell.
+	/// </summary>
+	public struct WPos
+	{
+		public readonly int X, Y, Z;
+
+		public WPos(int x, int y, int z) { X = x; Y = y; Z = z; }
+		public WPos(WRange x, WRange y, WRange z) { X = x.Range; Y = y.Range; Z = z.Range; }
+
+		public static readonly WPos Zero = new WPos(0, 0, 0);
+
+		public static explicit operator WVec(WPos a) { return new WVec(a.X, a.Y, a.Z); }
+
+		public static WPos operator +(WPos a, WVec b) { return new WPos(a.X + b.X, a.Y + b.Y, a.Z + b.Z); }
+		public static WPos operator -(WPos a, WVec b) { return new WPos(a.X - b.X, a.Y - b.Y, a.Z - b.Z); }
+		public static WVec operator -(WPos a, WPos b) { return new WVec(a.X - b.X, a.Y - b.Y, a.Z - b.Z); }
+
+		public static bool operator ==(WPos me, WPos other) { return (me.X == other.X && me.Y == other.Y && me.Z == other.Z); }
+		public static bool operator !=(WPos me, WPos other) { return !(me == other); }
+
+		public override int GetHashCode() { return X.GetHashCode() ^ Y.GetHashCode() ^ Z.GetHashCode(); }
+
+		public override bool Equals(object obj)
+		{
+			if (obj == null)
+				return false;
+
+			WPos o = (WPos)obj;
+			return o == this;
+		}
+
+		public override string ToString() { return "{0},{1},{2}".F(X, Y, Z); }
+	}
+}