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/World/CameraOvalMover.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;
+using OpenRA.Graphics;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[TraitLocation(SystemActors.World)]
+	[Desc("Moves the camera in an oval pattern around its starting position.")]
+	sealed class CameraOvalMoverInfo : TraitInfo
+	{
+		[Desc("Starting angle in degrees.")]
+		public int StartAngle = 45;
+
+		[Desc("How fast the camera moves around the oval.")]
+		public float DegreesPerSecond = 3f;
+
+		[Desc("The X and Y radius of the oval path. Z is unused.")]
+		public WVec OvalRadius = new(19200, 20480, 0);
+
+		public override object Create(ActorInitializer init) { return new CameraOvalMover(this); }
+	}
+
+	sealed class CameraOvalMover : IWorldLoaded
+	{
+		readonly CameraOvalMoverInfo info;
+		public CameraOvalMover(CameraOvalMoverInfo info)
+		{
+			this.info = info;
+		}
+
+		public void WorldLoaded(World world, WorldRenderer wr)
+		{
+			var vo = wr.Viewport.CenterPosition;
+			var viewportOrigin = new float2(vo.X, vo.Y);
+
+			float angle = info.StartAngle;
+			long lastTime = 0;
+			wr.Viewport.ViewportCenterProvider = () =>
+			{
+				if (!Game.Settings.Game.PauseShellmap)
+				{
+					var currentTime = Game.RunTime;
+					var dt = currentTime - lastTime;
+					lastTime = currentTime;
+
+					// Prevent large jumps when the game is paused or the framerate is very low.
+					const float MaxStep = 0.25f;
+					angle += Math.Min(dt / 1000.0f * info.DegreesPerSecond, MaxStep);
+				}
+
+				var rad = angle * (Math.PI / 180);
+				var offset = new float2((float)(info.OvalRadius.X * Math.Sin(rad)), (float)(info.OvalRadius.Y * Math.Cos(rad)));
+				return viewportOrigin + offset;
+			};
+		}
+	}
+}