New interface for things that show on radar; groundwork for future patches.

OpenRA.Game/Traits/Building.cs

@@ -10,6 +10,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Drawing;
 using System.Linq;
 using OpenRA.Effects;
 using OpenRA.GameRules;
@@ -47,7 +48,7 @@ namespace OpenRA.Traits
 		public object Create(ActorInitializer init) { return new Building(init); }
 	}
 
-	public class Building : INotifyDamage, IResolveOrder, ITick, IRenderModifier, IOccupySpace
+	public class Building : INotifyDamage, IResolveOrder, ITick, IRenderModifier, IOccupySpace, IRadarSignature
 	{
 		readonly Actor self;
 		public readonly BuildingInfo Info;
@@ -160,5 +161,15 @@ namespace OpenRA.Traits
 		{
 			return Footprint.UnpathableTiles( self.Info.Name, Info, TopLeft );
 		}
+		
+		public IEnumerable<int2> RadarSignatureCells(Actor self)
+		{
+			return Footprint.Tiles(self);
+		}
+		
+		public Color RadarSignatureColor(Actor self)
+		{
+			return self.Owner.Color;
+		}
 	}
 }

OpenRA.Game/Traits/TraitsInterfaces.cs

@@ -55,6 +55,12 @@ namespace OpenRA.Traits
 	public interface IExplodeModifier { bool ShouldExplode(Actor self); }
 	public interface INudge { void OnNudge(Actor self, Actor nudger); }
 
+	public interface IRadarSignature
+	{
+		IEnumerable<int2> RadarSignatureCells(Actor self);
+		Color RadarSignatureColor(Actor self);
+	}
+	
 	public interface IOccupySpace
 	{
 		int2 TopLeft { get; }

OpenRA.Game/Traits/Unit.cs

@@ -8,6 +8,9 @@
  */
 #endregion
 
+using System.Collections.Generic;
+using System.Drawing;
+
 namespace OpenRA.Traits
 {
 	public class UnitInfo : OwnedActorInfo, ITraitInfo
@@ -19,7 +22,7 @@ namespace OpenRA.Traits
 		public object Create( ActorInitializer init ) { return new Unit(); }
 	}
 
-	public class Unit : INotifyDamage
+	public class Unit : INotifyDamage, IRadarSignature
 	{
 		[Sync]
 		public int Facing;
@@ -32,5 +35,15 @@ namespace OpenRA.Traits
 				if (self.Owner == self.World.LocalPlayer)
 					Sound.PlayVoice("Lost", self);
 		}
+		
+		public IEnumerable<int2> RadarSignatureCells(Actor self)
+		{
+			yield return self.Location;
+		}
+		
+		public Color RadarSignatureColor(Actor self)
+		{
+			return self.Owner.Color;
+		}
 	}
 }