Basic chronosphere behavior

OpenRa.Game/Orders/ChronosphereSelectOrderGenerator.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using OpenRa.Game.GameRules;
+using OpenRa.Game.Traits;
+
+namespace OpenRa.Game.Orders
+{
+	class ChronosphereSelectOrderGenerator : IOrderGenerator
+	{
+		public IEnumerable<Order> Order(int2 xy, MouseInput mi)
+		{
+			if (mi.Button == MouseButton.Right)
+				Game.controller.CancelInputMode();
+
+			return OrderInner(xy, mi);
+		}
+
+		IEnumerable<Order> OrderInner(int2 xy, MouseInput mi)
+		{
+			if (mi.Button == MouseButton.Left)
+			{
+				var loc = mi.Location + Game.viewport.Location;
+				var underCursor = Game.FindUnits(loc, loc)
+					.Where(a => a.Owner == Game.LocalPlayer
+						&& a.traits.Contains<Unit>()
+						&& a.Info.Selectable).FirstOrDefault();
+				
+				var unit = underCursor != null ? underCursor.Info as UnitInfo : null;
+
+				if (unit != null)
+				{
+					yield return new Order("ChronosphereSelect", underCursor, null, int2.Zero, null);
+				}
+			}
+		}
+
+		public void Tick()
+		{
+			var hasChronosphere = Game.world.Actors
+				.Any(a => a.Owner == Game.LocalPlayer && a.traits.Contains<Chronosphere>());
+
+			if (!hasChronosphere)
+				Game.controller.CancelInputMode();
+		}
+
+		public void Render() { }
+
+		public Cursor GetCursor(int2 xy, MouseInput mi)
+		{
+			mi.Button = MouseButton.Left;
+			return OrderInner(xy, mi).Any()
+				? Cursor.ChronoshiftSelect : Cursor.MoveBlocked;
+		}
+	}
+}