109 lines
3.1 KiB
C#
109 lines
3.1 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2019 The OpenRA Developers (see AUTHORS)
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* This file is part of OpenRA, which is free software. It is made
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* available to you under the terms of the GNU General Public License
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* as published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version. For more
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* information, see COPYING.
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*/
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#endregion
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using OpenRA.Activities;
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using OpenRA.Mods.Common.Traits;
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using OpenRA.Traits;
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namespace OpenRA.Mods.Common.Activities
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{
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public class Land : Activity
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{
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readonly Target target;
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readonly Aircraft aircraft;
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readonly WVec offset;
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bool landingInitiated;
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bool soundPlayed;
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public Land(Actor self, Target t, WVec offset)
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{
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target = t;
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aircraft = self.Trait<Aircraft>();
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this.offset = offset;
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}
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public Land(Actor self, Target t)
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: this(self, t, WVec.Zero) { }
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public Land(Actor self)
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: this(self, Target.FromPos(Aircraft.GroundPosition(self)), WVec.Zero) { }
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public override Activity Tick(Actor self)
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{
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if (ChildActivity != null)
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{
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ChildActivity = ActivityUtils.RunActivity(self, ChildActivity);
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if (ChildActivity != null)
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return this;
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}
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if (IsCanceling || target.Type == TargetType.Invalid)
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{
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aircraft.RemoveInfluence();
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return NextActivity;
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}
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if (!landingInitiated)
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{
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var landingCell = !aircraft.Info.VTOL ? self.World.Map.CellContaining(target.CenterPosition + offset) : self.Location;
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if (!aircraft.CanLand(landingCell, target.Actor))
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{
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// Maintain holding pattern.
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if (!aircraft.Info.CanHover)
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QueueChild(self, new FlyCircle(self, 25), true);
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self.NotifyBlocker(landingCell);
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return this;
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}
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aircraft.AddInfluence(landingCell);
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aircraft.EnteringCell(self);
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landingInitiated = true;
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}
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var altitude = self.World.Map.DistanceAboveTerrain(self.CenterPosition);
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var landAltitude = self.World.Map.DistanceAboveTerrain(target.CenterPosition + offset) + aircraft.LandAltitude;
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if (!soundPlayed && aircraft.Info.LandingSounds.Length > 0 && altitude != landAltitude)
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{
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Game.Sound.Play(SoundType.World, aircraft.Info.LandingSounds, self.World, aircraft.CenterPosition);
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soundPlayed = true;
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}
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// For VTOLs we assume we've already arrived at the target location and just need to move downward
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if (aircraft.Info.VTOL)
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{
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if (Fly.VerticalTakeOffOrLandTick(self, aircraft, aircraft.Facing, landAltitude))
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return this;
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return NextActivity;
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}
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var d = (target.CenterPosition + offset) - self.CenterPosition;
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// The next move would overshoot, so just set the final position
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var move = aircraft.FlyStep(aircraft.Facing);
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if (d.HorizontalLengthSquared < move.HorizontalLengthSquared)
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{
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var landingAltVec = new WVec(WDist.Zero, WDist.Zero, aircraft.LandAltitude);
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aircraft.SetPosition(self, target.CenterPosition + offset + landingAltVec);
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return NextActivity;
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}
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var landingAlt = self.World.Map.DistanceAboveTerrain(target.CenterPosition + offset) + aircraft.LandAltitude;
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Fly.FlyTick(self, aircraft, d.Yaw.Facing, landingAlt);
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return this;
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}
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}
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}
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