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/Air/FlyForward.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 FlyForward : Activity
+	{
+		readonly Aircraft aircraft;
+		readonly WDist cruiseAltitude;
+		readonly int flyTicks;
+		int remainingDistance;
+		int ticks;
+
+		FlyForward(Actor self)
+		{
+			aircraft = self.Trait<Aircraft>();
+			cruiseAltitude = aircraft.Info.CruiseAltitude;
+		}
+
+		public FlyForward(Actor self, int ticks = -1)
+			: this(self)
+		{
+			flyTicks = ticks;
+		}
+
+		public FlyForward(Actor self, WDist distance)
+			: this(self)
+		{
+			remainingDistance = distance.Length;
+		}
+
+		public override bool Tick(Actor self)
+		{
+			// Refuse to take off if it would land immediately again.
+			if (aircraft.ForceLanding)
+			{
+				Cancel(self);
+				return true;
+			}
+
+			// Having flyTicks < 0 is valid and means the actor flies until this activity is canceled
+			if (IsCanceling || (flyTicks > 0 && ticks++ >= flyTicks) || (flyTicks == 0 && remainingDistance <= 0))
+				return true;
+
+			// FlyTick moves the aircraft while FlyStep calculates how far we are moving
+			if (remainingDistance != 0)
+				remainingDistance -= aircraft.FlyStep(aircraft.Facing).HorizontalLength;
+
+			Fly.FlyTick(self, aircraft, aircraft.Facing, cruiseAltitude);
+			return false;
+		}
+	}
+}