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/Activities/Parachute.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.Activities;
+using OpenRA.Mods.Common.Traits;
+
+namespace OpenRA.Mods.Common.Activities
+{
+	public class Parachute : Activity
+	{
+		readonly IPositionable pos;
+		readonly WVec fallVector;
+
+		int groundLevel;
+
+		public Parachute(Actor self)
+		{
+			pos = self.OccupiesSpace as IPositionable;
+			fallVector = new WVec(0, 0, self.Info.TraitInfo<ParachutableInfo>().FallRate);
+			IsInterruptible = false;
+		}
+
+		protected override void OnFirstRun(Actor self)
+		{
+			groundLevel = self.World.Map.CenterOfCell(self.Location).Z;
+			foreach (var np in self.TraitsImplementing<INotifyParachute>())
+				np.OnParachute(self);
+		}
+
+		public override bool Tick(Actor self)
+		{
+			var nextPosition = self.CenterPosition - fallVector;
+			if (nextPosition.Z < groundLevel)
+				return true;
+
+			pos.SetCenterPosition(self, nextPosition);
+
+			return false;
+		}
+
+		protected override void OnLastRun(Actor self)
+		{
+			var centerPosition = self.CenterPosition;
+			pos.SetPosition(self, centerPosition + new WVec(0, 0, groundLevel - centerPosition.Z));
+
+			foreach (var np in self.TraitsImplementing<INotifyParachute>())
+				np.OnLanded(self);
+		}
+	}
+}