combat actually works

OpenRa.DataStructures/float2.cs

@@ -86,5 +86,8 @@ namespace OpenRa
 
 		public static float2 Max(float2 a, float2 b) { return new float2(Math.Max(a.X, b.X), Math.Max(a.Y, b.Y)); }
 		public static float2 Min(float2 a, float2 b) { return new float2(Math.Min(a.X, b.X), Math.Min(a.Y, b.Y)); }
+
+		public float LengthSquared { get { return X * X + Y * Y; } }
+		public float Length { get { return (float)Math.Sqrt(LengthSquared); } }
 	}
 }