112 lines
3.2 KiB
C#
112 lines
3.2 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2015 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 Fly : Activity
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{
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readonly Aircraft plane;
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readonly Target target;
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readonly WDist maxRange;
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readonly WDist minRange;
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public Fly(Actor self, Target t)
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{
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plane = self.Trait<Aircraft>();
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target = t;
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}
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public Fly(Actor self, Target t, WDist minRange, WDist 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 void FlyToward(Actor self, Aircraft plane, int desiredFacing, WDist desiredAltitude)
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{
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desiredAltitude = new WDist(plane.CenterPosition.Z) + desiredAltitude - self.World.Map.DistanceAboveTerrain(plane.CenterPosition);
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var move = plane.FlyStep(plane.Facing);
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var altitude = plane.CenterPosition.Z;
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plane.Facing = Util.TickFacing(plane.Facing, desiredFacing, plane.ROT);
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if (altitude != desiredAltitude.Length)
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{
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var delta = move.HorizontalLength * plane.Info.MaximumPitch.Tan() / 1024;
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var dz = (desiredAltitude.Length - altitude).Clamp(-delta, delta);
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move += new WVec(0, 0, dz);
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}
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plane.SetPosition(self, plane.CenterPosition + move);
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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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// Inside the target annulus, so we're done
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var insideMaxRange = maxRange.Length > 0 && target.IsInRange(plane.CenterPosition, maxRange);
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var insideMinRange = minRange.Length > 0 && target.IsInRange(plane.CenterPosition, minRange);
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if (insideMaxRange && !insideMinRange)
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return NextActivity;
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// Close enough (ported from old code which checked length against sqrt(50) px)
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var d = target.CenterPosition - self.CenterPosition;
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if (d.HorizontalLengthSquared < 91022)
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return NextActivity;
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// Don't turn until we've reached the cruise altitude
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var desiredFacing = d.Yaw.Facing;
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var targetAltitude = plane.CenterPosition.Z + plane.Info.CruiseAltitude.Length - self.World.Map.DistanceAboveTerrain(plane.CenterPosition).Length;
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if (plane.CenterPosition.Z < targetAltitude)
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desiredFacing = plane.Facing;
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FlyToward(self, plane, desiredFacing, plane.Info.CruiseAltitude);
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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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public class FlyAndContinueWithCirclesWhenIdle : Fly
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{
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public FlyAndContinueWithCirclesWhenIdle(Actor self, Target t)
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: base(self, t) { }
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public FlyAndContinueWithCirclesWhenIdle(Actor self, Target t, WDist minRange, WDist maxRange)
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: base(self, t, minRange, maxRange) { }
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public override Activity Tick(Actor self)
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{
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var activity = base.Tick(self);
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if (activity == null && !IsCanceled)
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{
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self.QueueActivity(new FlyCircle(self));
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activity = NextActivity;
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}
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return activity;
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}
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}
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}
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