moved air unit support to ra

OpenRA.Mods.RA/Activities/Fly.cs

@@ -0,0 +1,78 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007,2009,2010 Chris Forbes, Robert Pepperell, Matthew Bowra-Dean, Paul Chote, Alli Witheford.
+ * This file is part of OpenRA.
+ * 
+ *  OpenRA is free software: you can redistribute it and/or modify
+ *  it 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.
+ * 
+ *  OpenRA is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ * 
+ *  You should have received a copy of the GNU General Public License
+ *  along with OpenRA.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#endregion
+
+using System;
+using OpenRA.GameRules;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA.Activities
+{
+	public class Fly : IActivity
+	{
+		readonly float2 Pos;
+		bool isCanceled;
+
+		public Fly(float2 pos) { Pos = pos; }
+		public Fly(int2 pos) { Pos = Util.CenterOfCell(pos); }
+		
+		public IActivity NextActivity { get; set; }
+		
+		public IActivity Tick(Actor self)
+		{
+			var cruiseAltitude = self.Info.Traits.Get<PlaneInfo>().CruiseAltitude;
+
+			if (isCanceled) return NextActivity;
+
+			var d = Pos - self.CenterLocation;
+			if (d.LengthSquared < 50)		/* close enough */
+				return NextActivity;
+
+			var unit = self.traits.Get<Unit>();
+
+			var desiredFacing = Util.GetFacing(d, unit.Facing);
+			if (unit.Altitude == cruiseAltitude)
+				Util.TickFacing(ref unit.Facing, desiredFacing, 
+					self.Info.Traits.Get<UnitInfo>().ROT);
+
+			if (unit.Altitude < cruiseAltitude)
+				++unit.Altitude;
+
+			FlyUtil.Fly(self, cruiseAltitude);
+			return this;
+		}
+
+		public void Cancel(Actor self) { isCanceled = true; NextActivity = null; }
+	}
+
+	public static class FlyUtil
+	{
+		public static void Fly(Actor self, int desiredAltitude )
+		{
+			var unit = self.traits.Get<Unit>();
+			var speed = .2f * Util.GetEffectiveSpeed(self, UnitMovementType.Fly);
+			var angle = unit.Facing / 128f * Math.PI;
+
+			self.CenterLocation += speed * -float2.FromAngle((float)angle);
+			self.Location = ((1 / 24f) * self.CenterLocation).ToInt2();
+
+			unit.Altitude += Math.Sign(desiredAltitude - unit.Altitude);
+		}
+	}
+}