118 lines
3.4 KiB
C#
118 lines
3.4 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2017 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 System;
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using System.Linq;
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using OpenRA.Activities;
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using OpenRA.Traits;
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namespace OpenRA.Mods.Common.Traits
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{
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[Desc("Actor will follow units until in range to attack them.")]
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public class AttackFollowInfo : AttackBaseInfo
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{
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public override object Create(ActorInitializer init) { return new AttackFollow(init.Self, this); }
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}
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public class AttackFollow : AttackBase, ITick, INotifyOwnerChanged
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{
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public Target Target { get; protected set; }
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public AttackFollow(Actor self, AttackFollowInfo info)
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: base(self, info) { }
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public virtual void Tick(Actor self)
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{
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if (IsTraitDisabled)
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{
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Target = Target.Invalid;
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return;
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}
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DoAttack(self, Target);
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IsAttacking = Target.IsValidFor(self);
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}
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public override Activity GetAttackActivity(Actor self, Target newTarget, bool allowMove, bool forceAttack)
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{
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return new AttackActivity(self, newTarget, allowMove, forceAttack);
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}
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protected override void OnStopOrder(Actor self)
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{
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Target = Target.Invalid;
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base.OnStopOrder(self);
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}
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public void OnOwnerChanged(Actor self, Player oldOwner, Player newOwner)
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{
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Target = Target.Invalid;
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}
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class AttackActivity : Activity
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{
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readonly AttackFollow attack;
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readonly IMove move;
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readonly Target target;
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readonly bool forceAttack;
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bool hasTicked;
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public AttackActivity(Actor self, Target target, bool allowMove, bool forceAttack)
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{
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attack = self.Trait<AttackFollow>();
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move = allowMove ? self.TraitOrDefault<IMove>() : null;
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this.target = target;
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this.forceAttack = forceAttack;
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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 (self.IsDisabled())
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return this;
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var weapon = attack.ChooseArmamentsForTarget(target, forceAttack).FirstOrDefault();
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if (weapon != null)
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{
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var targetIsMobile = (target.Type == TargetType.Actor && target.Actor.Info.HasTraitInfo<IMoveInfo>())
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|| (target.Type == TargetType.FrozenActor && target.FrozenActor.Info.HasTraitInfo<IMoveInfo>());
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// Try and sit at least one cell closer than the max range to give some leeway if the target starts moving.
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var modifiedRange = weapon.MaxRange();
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var maxRange = targetIsMobile ? new WDist(Math.Max(weapon.Weapon.MinRange.Length, modifiedRange.Length - 1024))
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: modifiedRange;
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// Check that AttackFollow hasn't cancelled the target by modifying attack.Target
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// Having both this and AttackFollow modify that field is a horrible hack.
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if (hasTicked && attack.Target.Type == TargetType.Invalid)
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return NextActivity;
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attack.Target = target;
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hasTicked = true;
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if (move != null)
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return ActivityUtils.SequenceActivities(move.MoveFollow(self, target, weapon.Weapon.MinRange, maxRange), this);
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if (target.IsInRange(self.CenterPosition, weapon.MaxRange()) &&
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!target.IsInRange(self.CenterPosition, weapon.Weapon.MinRange))
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return this;
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}
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attack.Target = Target.Invalid;
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return NextActivity;
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}
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}
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}
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}
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