Add a new native-lua implementation.

OpenRA.Game/CVec.cs

@@ -10,13 +10,13 @@
 
 using System;
 using System.Drawing;
+using Eluant;
+using Eluant.ObjectBinding;
+using OpenRA.Scripting;
 
 namespace OpenRA
 {
-	/// <summary>
-	/// Cell coordinate vector (coarse).
-	/// </summary>
-	public struct CVec
+	public struct CVec : IScriptBindable, ILuaAdditionBinding, ILuaSubtractionBinding, ILuaUnaryMinusBinding, ILuaEqualityBinding, ILuaTableBinding
 	{
 		public readonly int X, Y;
 
@@ -82,5 +82,60 @@ namespace OpenRA
 			new CVec(1,  0),
 			new CVec(1,  1),
 		};
+
+		#region Scripting interface
+
+		public LuaValue Add(LuaRuntime runtime, LuaValue left, LuaValue right)
+		{
+			CVec a, b;
+			if (!left.TryGetClrValue<CVec>(out a) || !right.TryGetClrValue<CVec>(out b))
+				throw new LuaException("Attempted to call CVec.Add(CVec, CVec) with invalid arguments ({0}, {1})".F(left.WrappedClrType().Name, right.WrappedClrType().Name));
+
+			return new LuaCustomClrObject(a + b);
+		}
+
+		public LuaValue Subtract(LuaRuntime runtime, LuaValue left, LuaValue right)
+		{
+			CVec a, b;
+			if (!left.TryGetClrValue<CVec>(out a) || !right.TryGetClrValue<CVec>(out b))
+				throw new LuaException("Attempted to call CVec.Subtract(CVec, CVec) with invalid arguments ({0}, {1})".F(left.WrappedClrType().Name, right.WrappedClrType().Name));
+
+			return new LuaCustomClrObject(a - b);
+		}
+
+		public LuaValue Minus(LuaRuntime runtime)
+		{
+			return new LuaCustomClrObject(-this);
+		}
+
+		public LuaValue Equals(LuaRuntime runtime, LuaValue left, LuaValue right)
+		{
+			CVec a, b;
+			if (!left.TryGetClrValue<CVec>(out a) || !right.TryGetClrValue<CVec>(out b))
+				return false;
+
+			return a == b;
+		}
+
+		public LuaValue this[LuaRuntime runtime, LuaValue key]
+		{
+			get
+			{
+				switch (key.ToString())
+				{
+					case "X": return X;
+					case "Y": return Y;
+					case "Facing": return Traits.Util.GetFacing(this, 0);
+					default: throw new LuaException("CVec does not define a member '{0}'".F(key));
+				}
+			}
+
+			set
+			{
+				throw new LuaException("WVec is read-only. Use CVec.New to create a new value");
+			}
+		}
+
+		#endregion
 	}
 }