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/Move/Drag.cs

@@ -0,0 +1,73 @@
+#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.Generic;
+using OpenRA.Activities;
+using OpenRA.Mods.Common.Traits;
+using OpenRA.Primitives;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Activities
+{
+	public class Drag : Activity
+	{
+		readonly IPositionable positionable;
+		readonly IDisabledTrait disableable;
+		readonly WPos start;
+		readonly WPos end;
+		readonly int length;
+		int ticks = 0;
+		readonly WAngle? desiredFacing;
+
+		public Drag(Actor self, WPos start, WPos end, int length, WAngle? facing = null)
+		{
+			positionable = self.Trait<IPositionable>();
+			disableable = self.TraitOrDefault<IMove>() as IDisabledTrait;
+			this.start = start;
+			this.end = end;
+			this.length = length;
+			desiredFacing = facing;
+			IsInterruptible = false;
+		}
+
+		protected override void OnFirstRun(Actor self)
+		{
+			if (desiredFacing.HasValue)
+				QueueChild(new Turn(self, desiredFacing.Value));
+		}
+
+		public override bool Tick(Actor self)
+		{
+			if (disableable != null && disableable.IsTraitDisabled)
+				return false;
+
+			var pos = length > 1
+				? WPos.Lerp(start, end, ticks, length - 1)
+				: end;
+
+			positionable.SetCenterPosition(self, pos);
+			if (++ticks >= length)
+				return true;
+
+			return false;
+		}
+
+		public override IEnumerable<Target> GetTargets(Actor self)
+		{
+			yield return Target.FromPos(end);
+		}
+
+		public override IEnumerable<TargetLineNode> TargetLineNodes(Actor self)
+		{
+			yield return new TargetLineNode(Target.FromPos(end), Color.Green);
+		}
+	}
+}