Move Targetable*, Seeds/StoresResource(s) and two RenderBuilding traits to Mods.Common

OpenRA.Mods.Common/Traits/SeedsResource.cs

@@ -0,0 +1,86 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2014 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using OpenRA.Support;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Lets the actor spread resources around it in a circle.")]
+	class SeedsResourceInfo : ITraitInfo
+	{
+		public readonly int Interval = 75;
+		public readonly string ResourceType = "Ore";
+		public readonly int MaxRange = 100;
+
+		public object Create(ActorInitializer init) { return new SeedsResource(init.Self, this); }
+	}
+
+	class SeedsResource : ITick, ISeedableResource
+	{
+		readonly SeedsResourceInfo info;
+
+		readonly ResourceType resourceType;
+		readonly ResourceLayer resLayer;
+
+		public SeedsResource(Actor self, SeedsResourceInfo info)
+		{
+			this.info = info;
+
+			resourceType = self.World.WorldActor.TraitsImplementing<ResourceType>()
+				.FirstOrDefault(t => t.Info.Name == info.ResourceType);
+
+			if (resourceType == null)
+				throw new InvalidOperationException("No such resource type `{0}`".F(info.ResourceType));
+
+			resLayer = self.World.WorldActor.Trait<ResourceLayer>();
+		}
+
+		int ticks;
+
+		public void Tick(Actor self)
+		{
+			if (--ticks <= 0)
+			{
+				Seed(self);
+				ticks = info.Interval;
+			}
+		}
+
+		public void Seed(Actor self)
+		{
+			var cell = RandomWalk(self.Location, self.World.SharedRandom)
+				.Take(info.MaxRange)
+				.SkipWhile(p => resLayer.GetResource(p) == resourceType && resLayer.IsFull(p))
+				.Cast<CPos?>().FirstOrDefault();
+
+			if (cell != null && resLayer.CanSpawnResourceAt(resourceType, cell.Value))
+				resLayer.AddResource(resourceType, cell.Value, 1);
+		}
+
+		static IEnumerable<CPos> RandomWalk(CPos p, MersenneTwister r)
+		{
+			for (;;)
+			{
+				var dx = r.Next(-1, 2);
+				var dy = r.Next(-1, 2);
+
+				if (dx == 0 && dy == 0)
+					continue;
+
+				p += new CVec(dx, dy);
+				yield return p;
+			}
+		}
+	}
+}