Initial commit: OpenRA game engine

Fork from OpenRA/OpenRA with one-click launch script (start-ra.cmd)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

OpenRA.Mods.D2k/Traits/AttractsWorms.cs

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+#region Copyright & License Information
+/*
+ * Copyright (c) The OpenRA Developers and Contributors
+ * 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.Collections.Immutable;
+using OpenRA.Mods.Common.Traits;
+
+namespace OpenRA.Mods.D2k.Traits
+{
+	[Desc("This actor makes noise, which causes them to be targeted by actors with the Sandworm trait.")]
+	public class AttractsWormsInfo : ConditionalTraitInfo
+	{
+		[Desc("How much noise this actor produces.")]
+		public readonly int Intensity = 0;
+
+		[Desc("Noise percentage at Range step away from the actor.")]
+		public readonly ImmutableArray<int> Falloff = [100, 100, 25, 11, 6, 4, 3, 2, 1, 0];
+
+		[Desc("Range between falloff steps.")]
+		public readonly WDist Spread = new(3072);
+
+		[Desc("Ranges at which each Falloff step is defined. Overrides Spread.")]
+		public readonly ImmutableArray<WDist> Range = default;
+
+		public override object Create(ActorInitializer init) { return new AttractsWorms(init, this); }
+	}
+
+	public class AttractsWorms : ConditionalTrait<AttractsWormsInfo>
+	{
+		readonly Actor self;
+		readonly ImmutableArray<WDist> effectiveRange;
+
+		public AttractsWorms(ActorInitializer init, AttractsWormsInfo info)
+			: base(info)
+		{
+			self = init.Self;
+
+			effectiveRange = info.Range != null ? info.Range : Exts.MakeArray(info.Falloff.Length, i => i * info.Spread).ToImmutableArray();
+		}
+
+		int GetNoisePercentageAtDistance(int distance)
+		{
+			var inner = effectiveRange[0].Length;
+			for (var i = 1; i < effectiveRange.Length; i++)
+			{
+				var outer = effectiveRange[i].Length;
+				if (outer > distance)
+					return int2.Lerp(Info.Falloff[i - 1], Info.Falloff[i], distance - inner, outer - inner);
+
+				inner = outer;
+			}
+
+			return 0;
+		}
+
+		public WVec AttractionAtPosition(WPos pos)
+		{
+			if (IsTraitDisabled)
+				return WVec.Zero;
+
+			var distance = self.CenterPosition - pos;
+			var length = distance.Length;
+
+			// Actor is too far to hear anything.
+			if (length > effectiveRange[^1].Length)
+				return WVec.Zero;
+
+			var direction = 1024 * distance / length;
+			var percentage = GetNoisePercentageAtDistance(length);
+
+			return direction * Info.Intensity * percentage / 100;
+		}
+	}
+}