57 lines
1.7 KiB
C#
57 lines
1.7 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2019 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.Drawing;
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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 Follow : Activity
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{
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readonly Target target;
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readonly WDist minRange;
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readonly WDist maxRange;
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readonly IMove move;
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readonly Color? targetLineColor;
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public Follow(Actor self, Target target, WDist minRange, WDist maxRange,
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WPos? initialTargetPosition, Color? targetLineColor = null)
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{
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this.target = target;
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this.minRange = minRange;
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this.maxRange = maxRange;
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this.targetLineColor = targetLineColor;
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move = self.Trait<IMove>();
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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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var cachedPosition = target.CenterPosition;
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var path = move.MoveWithinRange(target, minRange, maxRange, targetLineColor: targetLineColor);
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// We are already in range, so wait until the target moves before doing anything
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if (target.IsInRange(self.CenterPosition, maxRange) && !target.IsInRange(self.CenterPosition, minRange))
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{
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var wait = new WaitFor(() => !target.IsValidFor(self) || target.CenterPosition != cachedPosition);
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return ActivityUtils.SequenceActivities(wait, path, this);
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}
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return ActivityUtils.SequenceActivities(path, this);
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}
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}
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}
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