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.Common/Traits/ExplosionOnDamageTransition.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 OpenRA.GameRules;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("This actor triggers an explosion on itself when transitioning to a specific damage state.")]
+	public class ExplosionOnDamageTransitionInfo : ConditionalTraitInfo, IRulesetLoaded, Requires<IHealthInfo>
+	{
+		[WeaponReference]
+		[FieldLoader.Require]
+		[Desc("Weapon to use for explosion.")]
+		public readonly string Weapon = null;
+
+		[Desc("At which damage state explosion will trigger.")]
+		public readonly DamageState DamageState = DamageState.Heavy;
+
+		[Desc("Should the explosion only be triggered once?")]
+		public readonly bool TriggerOnlyOnce = false;
+
+		public WeaponInfo WeaponInfo { get; private set; }
+
+		public override object Create(ActorInitializer init) { return new ExplosionOnDamageTransition(this); }
+
+		public override void RulesetLoaded(Ruleset rules, ActorInfo ai)
+		{
+			base.RulesetLoaded(rules, ai);
+
+			if (string.IsNullOrEmpty(Weapon))
+				return;
+
+			var weaponToLower = Weapon.ToLowerInvariant();
+			if (!rules.Weapons.TryGetValue(weaponToLower, out var weapon))
+				throw new YamlException($"Weapons Ruleset does not contain an entry '{weaponToLower}'");
+
+			WeaponInfo = weapon;
+		}
+	}
+
+	public class ExplosionOnDamageTransition : ConditionalTrait<ExplosionOnDamageTransitionInfo>, INotifyDamageStateChanged
+	{
+		bool triggered;
+
+		public ExplosionOnDamageTransition(ExplosionOnDamageTransitionInfo info)
+			: base(info) { }
+
+		void INotifyDamageStateChanged.DamageStateChanged(Actor self, AttackInfo e)
+		{
+			if (!self.IsInWorld)
+				return;
+
+			if (triggered)
+				return;
+
+			if (IsTraitDisabled)
+				return;
+
+			if (e.DamageState >= Info.DamageState && e.PreviousDamageState < Info.DamageState)
+			{
+				if (Info.TriggerOnlyOnce)
+					triggered = true;
+
+				// Use .FromPos since the actor might have been killed, don't use Target.FromActor
+				Info.WeaponInfo.Impact(Target.FromPos(self.CenterPosition), e.Attacker);
+			}
+		}
+	}
+}