ore growth -> trait on world

OpenRa.Game/Traits/OreGrowth.cs

@@ -0,0 +1,42 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using OpenRa.Graphics;
+
+namespace OpenRa.Traits
+{
+	class OreGrowthInfo : ITraitInfo
+	{
+		public readonly float Interval = 1f;
+		public readonly float Chance = .02f;
+		public readonly bool Spreads = true;
+		public readonly bool Grows = true;
+
+		public object Create(Actor self) { return new OreGrowth(); }
+	}
+
+	class OreGrowth : ITick
+	{
+		int remainingTicks;
+
+		public void Tick(Actor self)
+		{
+			if (--remainingTicks <= 0)
+			{
+				var info = self.Info.Traits.Get<OreGrowthInfo>();
+				
+				if (info.Spreads) 
+					Ore.SpreadOre(self.World, 
+						Game.SharedRandom,
+						info.Chance);
+
+				if (info.Grows)
+					Ore.GrowOre(self.World, Game.SharedRandom);
+
+				self.World.Minimap.InvalidateOre();
+				remainingTicks = (int)(info.Interval * 60 * 25);
+			}
+		}
+	}
+}