93 lines
2.8 KiB
C#
93 lines
2.8 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007,2009,2010 Chris Forbes, Robert Pepperell, Matthew Bowra-Dean, Paul Chote, Alli Witheford.
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* This file is part of OpenRA.
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*
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* OpenRA is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* OpenRA is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with OpenRA. If not, see <http://www.gnu.org/licenses/>.
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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.GameRules;
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namespace OpenRA.Traits.Activities
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{
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class HeliAttack : IActivity
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{
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Actor target;
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const int CruiseAltitude = 20;
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const int AvoidDist = 80;
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public HeliAttack( Actor target ) { this.target = target; }
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public IActivity NextActivity { get; set; }
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public IActivity Tick(Actor self)
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{
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if (target == null || target.IsDead)
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return NextActivity;
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var limitedAmmo = self.traits.GetOrDefault<LimitedAmmo>();
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if (limitedAmmo != null && !limitedAmmo.HasAmmo())
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return NextActivity;
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var unit = self.traits.Get<Unit>();
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if (unit.Altitude != CruiseAltitude)
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{
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unit.Altitude += Math.Sign(CruiseAltitude - unit.Altitude);
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return this;
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}
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var range = self.GetPrimaryWeapon().Range - 1;
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var dist = target.CenterLocation - self.CenterLocation;
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var desiredFacing = Util.GetFacing(dist, unit.Facing);
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Util.TickFacing(ref unit.Facing, desiredFacing, self.Info.Traits.Get<UnitInfo>().ROT);
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var rawSpeed = .2f * Util.GetEffectiveSpeed(self, UnitMovementType.Fly);
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if (!float2.WithinEpsilon(float2.Zero, dist, range * Game.CellSize))
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self.CenterLocation += (rawSpeed / dist.Length) * dist;
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var otherHelis = self.World.FindUnitsInCircle(self.CenterLocation, AvoidDist)
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.Where(a => a.traits.Contains<Helicopter>());
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var f = otherHelis
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.Select(h => GetRepulseForce(self, h))
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.Aggregate(float2.Zero, (a, b) => a + b);
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self.CenterLocation += rawSpeed * f;
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self.Location = ((1 / 24f) * self.CenterLocation).ToInt2();
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return this;
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}
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const float Epsilon = .5f;
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float2 GetRepulseForce(Actor self, Actor h)
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{
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if (self == h)
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return float2.Zero;
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var d = self.CenterLocation - h.CenterLocation;
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if (d.LengthSquared < Epsilon)
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return float2.FromAngle((float)self.World.SharedRandom.NextDouble() * 3.14f);
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return (2 / d.LengthSquared) * d;
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}
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public void Cancel(Actor self) { target = null; NextActivity = null; }
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}
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}
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