122 lines
3.4 KiB
C#
Executable File
122 lines
3.4 KiB
C#
Executable File
#region Copyright & License Information
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/*
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* Copyright 2007-2011 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;
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using System.Linq;
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using OpenRA.Traits;
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using OpenRA.Mods.RA.Buildings;
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namespace OpenRA.Mods.RA.Air
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{
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public class ReturnToBase : Activity
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{
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bool isCalculated;
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Actor dest;
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PPos w1, w2, w3; /* tangent points to turn circles */
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public static Actor ChooseAirfield(Actor self, bool unreservedOnly)
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{
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var rearmBuildings = self.Info.Traits.Get<PlaneInfo>().RearmBuildings;
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return self.World.ActorsWithTrait<Reservable>()
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.Where(a => a.Actor.Owner == self.Owner)
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.Where(a => rearmBuildings.Contains(a.Actor.Info.Name)
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&& (!unreservedOnly || !Reservable.IsReserved(a.Actor)))
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.Select(a => a.Actor)
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.ClosestTo(self);
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}
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void Calculate(Actor self)
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{
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if (dest == null || Reservable.IsReserved(dest)) dest = ChooseAirfield(self, true);
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if (dest == null) return;
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var plane = self.Trait<Plane>();
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var res = dest.TraitOrDefault<Reservable>();
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if (res != null)
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{
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plane.UnReserve();
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plane.reservation = res.Reserve(dest, self, plane);
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}
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var landPos = dest.CenterLocation;
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var aircraft = self.Trait<Aircraft>();
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var speed = .2f * aircraft.MovementSpeed;
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/* if the aircraft is on the ground, it will take off to the cruise altitude first before approaching */
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var altitude = aircraft.Altitude;
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if (altitude == 0) altitude = self.Info.Traits.Get<PlaneInfo>().CruiseAltitude;
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var approachStart = landPos.ToInt2() - new float2(altitude * speed, 0);
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var turnRadius = (128f / self.Info.Traits.Get<AircraftInfo>().ROT) * speed / (float)Math.PI;
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/* work out the center points */
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var fwd = -float2.FromAngle(aircraft.Facing / 128f * (float)Math.PI);
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var side = new float2(-fwd.Y, fwd.X); /* rotate */
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var sideTowardBase = new[] { side, -side }
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.OrderBy(a => float2.Dot(a, self.CenterLocation.ToInt2() - approachStart))
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.First();
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var c1 = self.CenterLocation.ToInt2() + turnRadius * sideTowardBase;
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var c2 = approachStart + new float2(0, turnRadius * Math.Sign(self.CenterLocation.Y - approachStart.Y)); // above or below start point
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/* work out tangent points */
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var d = c2 - c1;
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var e = (turnRadius / d.Length) * d;
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var f = new float2(-e.Y, e.X); /* rotate */
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/* TODO: support internal tangents, too! */
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if (f.X > 0) f = -f;
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w1 = (PPos)(c1 + f).ToInt2();
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w2 = (PPos)(c2 + f).ToInt2();
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w3 = (PPos)(approachStart).ToInt2();
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plane.RTBPathHash = (PVecInt)w1 + (PVecInt)w2 + (PVecInt)w3;
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isCalculated = true;
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}
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public ReturnToBase(Actor self, Actor dest)
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{
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this.dest = dest;
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}
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public override Activity Tick(Actor self)
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{
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if (IsCanceled)
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return NextActivity;
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if (self.IsDead())
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return NextActivity;
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if (!isCalculated)
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Calculate(self);
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if (dest == null)
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{
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var nearestAfld = ChooseAirfield(self, false);
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self.CancelActivity();
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if (nearestAfld != null)
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return Util.SequenceActivities(Fly.ToCell(nearestAfld.Location), new FlyCircle());
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else
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return new FlyCircle();
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}
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return Util.SequenceActivities(
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Fly.ToPx(w1),
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Fly.ToPx(w2),
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Fly.ToPx(w3),
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new Land(Target.FromActor(dest)),
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NextActivity);
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}
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}
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}
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