Setup Tiberian Sun forest fires.

OpenRA.Mods.Common/Traits/Conditions/SpreadsCondition.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2022 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, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System.Linq;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Any actor with this trait enabled has a chance to affect others with this trait.")]
+	public class SpreadsConditionInfo : ConditionalTraitInfo
+	{
+		[Desc("The chance this actor is going to affect an adjacent actor.")]
+		public readonly int Probability = 5;
+
+		[Desc("How far the condition can spread from one actor to another.")]
+		public readonly WDist Range = WDist.FromCells(3);
+
+		[GrantedConditionReference]
+		[Desc("Condition to grant onto another actor in range with the same trait.")]
+		public readonly string SpreadCondition = "spreading";
+
+		[Desc("Time in ticks to wait between spreading further.")]
+		public int Delay = 5;
+
+		public override object Create(ActorInitializer init) { return new SpreadsCondition(this); }
+	}
+
+	public class SpreadsCondition : ConditionalTrait<SpreadsConditionInfo>, ITick
+	{
+		readonly SpreadsConditionInfo info;
+
+		int delay;
+
+		public SpreadsCondition(SpreadsConditionInfo info)
+			: base(info)
+		{
+			this.info = info;
+			delay = info.Delay;
+		}
+
+		void ITick.Tick(Actor self)
+		{
+			if (IsTraitDisabled)
+				return;
+
+			if (delay-- > 0)
+				return;
+
+			delay = info.Delay;
+
+			if (self.World.SharedRandom.Next(100) > info.Probability)
+				return;
+
+			var actorsInRange = self.World.FindActorsInCircle(self.CenterPosition, info.Range)
+				.Where(a => a.TraitOrDefault<SpreadsCondition>() != null);
+
+			var target = actorsInRange.RandomOrDefault(self.World.SharedRandom);
+			target?.GrantCondition(info.SpreadCondition);
+		}
+	}
+}