Refactor McvDeploy into a generic 'transform into another actor' trait

OpenRa.Game/Traits/TransformsOnDeploy.cs

@@ -0,0 +1,68 @@
+using OpenRa.GameRules;
+using OpenRa.Traits.Activities;
+using System;
+
+namespace OpenRa.Traits
+{
+	class TransformsOnDeployInfo : ITraitInfo
+	{
+		public readonly string TransformsInto = null;
+		public readonly int[] Offset = null;
+		public readonly int[] DeployDirections = new int[] {96};
+		public readonly bool TransferHealthPercentage = true; // Set to false to transfer the absolute health
+		public readonly string[] TransformSounds = null;
+		public readonly string[] NoTransformSounds = null;
+		
+		public object Create(Actor self) { return new TransformsOnDeploy(self); }
+	}
+
+	class TransformsOnDeploy : IIssueOrder, IResolveOrder
+	{
+		public TransformsOnDeploy(Actor self) { }
+
+		public Order IssueOrder(Actor self, int2 xy, MouseInput mi, Actor underCursor)
+		{
+			if (mi.Button == MouseButton.Right && self == underCursor)
+				return new Order("DeployTransform", self);
+
+			return null;
+		}
+
+		public void ResolveOrder( Actor self, Order order )
+		{
+			if (order.OrderString == "DeployTransform")
+			{
+				var info = self.Info.Traits.Get<TransformsOnDeployInfo>();
+				
+				var transInfo = Rules.Info[info.TransformsInto];
+				
+				if (transInfo.Traits.Contains<BuildingInfo>())
+				{
+					var bi = transInfo.Traits.Get<BuildingInfo>();
+					if (!self.World.CanPlaceBuilding(info.TransformsInto, bi, self.Location + new int2(info.Offset[0], info.Offset[1]), self))
+					{
+						foreach (var s in info.NoTransformSounds)
+							Sound.PlayToPlayer(self.Owner, s);
+							
+						return;
+					}
+					
+				}
+				self.CancelActivity();
+				
+				// Pick the closed deploy direction to turn to
+				if (self.traits.Contains<Unit>())
+				{
+					var unit = self.traits.Get<Unit>();
+				
+					// TODO: Pick the closest deploy direction
+					var bestDir = info.DeployDirections[0];
+										
+					self.QueueActivity(new Turn(bestDir));
+				}
+				
+				self.QueueActivity(new TransformIntoActor(info.TransformsInto, new int2(info.Offset[0], info.Offset[1]), info.TransferHealthPercentage, info.TransformSounds));
+			}
+		}
+	}
+}