initial setup for decorating the PlaceBuilding OG

OpenRA.Mods.RA/AttackBase.cs

@@ -12,7 +12,6 @@ using System;
 using System.Collections.Generic;
 using System.Drawing;
 using System.Linq;
-using OpenRA.Effects;
 using OpenRA.FileFormats;
 using OpenRA.Traits;
 

OpenRA.Mods.RA/Orders/PlaceBuildingOrderGenerator.cs

@@ -12,8 +12,8 @@ using System.Collections.Generic;
 using System.Linq;
 using OpenRA.Graphics;
 using OpenRA.Mods.RA.Buildings;
-using OpenRA.Traits;
 using OpenRA.Mods.RA.Render;
+using OpenRA.Traits;
 
 namespace OpenRA.Mods.RA.Orders
 {
@@ -71,6 +71,10 @@ namespace OpenRA.Mods.RA.Orders
 			var position = Game.viewport.ViewToWorld(Viewport.LastMousePos).ToInt2();
 			var topLeft = position - FootprintUtils.AdjustForBuildingSize( BuildingInfo );
 
+			var actorInfo = Rules.Info[Building];
+			foreach (var dec in actorInfo.Traits.WithInterface<IPlaceBuildingDecoration>())
+				dec.Render(wr, world, actorInfo, Traits.Util.CenterOfCell(position));	/* hack hack */
+			
 			var cells = new Dictionary<int2, bool>();
 			// Linebuild for walls.
 			// Assumes a 1x1 footprint; weird things will happen for other footprints

OpenRA.Mods.RA/RenderRangeCircle.cs

@@ -14,7 +14,23 @@ using OpenRA.Traits;
 
 namespace OpenRA.Mods.RA
 {
-	class RenderRangeCircleInfo : TraitInfo<RenderRangeCircle> { }
+	public interface IPlaceBuildingDecoration
+	{
+		void Render(WorldRenderer wr, World w, ActorInfo ai, int2 centerLocation);
+	}
+
+	class RenderRangeCircleInfo : TraitInfo<RenderRangeCircle>, IPlaceBuildingDecoration
+	{
+		public readonly string RangeCircleType;
+
+		public void Render(WorldRenderer wr, World w, ActorInfo ai, int2 centerLocation)
+		{
+			wr.DrawRangeCircle(
+				Color.FromArgb(128, Color.Yellow),
+				centerLocation, 3	/* hack: get this from the ActorInfo, but it's nontrivial currently */);
+		}
+	}
+
 	class RenderRangeCircle : IPreRenderSelection
 	{
 		public void RenderBeforeWorld(WorldRenderer wr, Actor self)