96 lines
2.6 KiB
C#
96 lines
2.6 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2014 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. For more information,
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* see COPYING.
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*/
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#endregion
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using System.Collections.Generic;
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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 HeliFly : Activity
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{
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readonly Helicopter helicopter;
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readonly Target target;
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readonly WRange maxRange;
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readonly WRange minRange;
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public HeliFly(Actor self, Target t)
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{
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helicopter = self.Trait<Helicopter>();
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target = t;
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}
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public HeliFly(Actor self, Target t, WRange minRange, WRange maxRange)
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: this(self, t)
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{
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this.maxRange = maxRange;
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this.minRange = minRange;
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}
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public static bool AdjustAltitude(Actor self, Helicopter helicopter, WRange targetAltitude)
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{
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var altitude = helicopter.CenterPosition.Z;
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if (altitude == targetAltitude.Range)
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return false;
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var delta = helicopter.Info.AltitudeVelocity.Range;
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var dz = (targetAltitude.Range - altitude).Clamp(-delta, delta);
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helicopter.SetPosition(self, helicopter.CenterPosition + new WVec(0, 0, dz));
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return true;
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}
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public override Activity Tick(Actor self)
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{
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if (IsCanceled || !target.IsValidFor(self))
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return NextActivity;
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if (AdjustAltitude(self, helicopter, helicopter.Info.CruiseAltitude))
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return this;
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var pos = target.CenterPosition;
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// Rotate towards the target
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var dist = pos - self.CenterPosition;
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var desiredFacing = Util.GetFacing(dist, helicopter.Facing);
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helicopter.Facing = Util.TickFacing(helicopter.Facing, desiredFacing, helicopter.ROT);
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var move = helicopter.FlyStep(desiredFacing);
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// Inside the minimum range, so reverse
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if (minRange.Range > 0 && target.IsInRange(helicopter.CenterPosition, minRange))
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{
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helicopter.SetPosition(self, helicopter.CenterPosition - move);
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return this;
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}
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// Inside the maximum range, so we're done
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if (maxRange.Range > 0 && target.IsInRange(helicopter.CenterPosition, maxRange))
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return NextActivity;
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// The next move would overshoot, so just set the final position
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if (dist.HorizontalLengthSquared < move.HorizontalLengthSquared)
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{
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helicopter.SetPosition(self, pos + new WVec(0, 0, helicopter.Info.CruiseAltitude.Range - pos.Z));
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return NextActivity;
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}
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helicopter.SetPosition(self, helicopter.CenterPosition + move);
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return this;
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}
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public override IEnumerable<Target> GetTargets(Actor self)
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{
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yield return target;
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}
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}
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}
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