63 lines
1.9 KiB
C#
63 lines
1.9 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 System.Linq;
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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 MoveWithinRange : MoveAdjacentTo
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{
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readonly WDist maxRange;
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readonly WDist minRange;
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public MoveWithinRange(Actor self, Target target, WDist minRange, WDist maxRange)
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: base(self, target)
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{
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this.minRange = minRange;
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this.maxRange = maxRange;
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}
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protected override bool ShouldStop(Actor self, CPos oldTargetPosition)
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{
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// We are now in range. Don't move any further!
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// HACK: This works around the pathfinder not returning the shortest path
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var cp = self.CenterPosition;
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return Target.IsInRange(cp, maxRange) && !Target.IsInRange(cp, minRange);
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}
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protected override bool ShouldRepath(Actor self, CPos oldTargetPosition)
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{
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var cp = self.CenterPosition;
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return targetPosition != oldTargetPosition && (!Target.IsInRange(cp, maxRange) || Target.IsInRange(cp, minRange));
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}
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protected override IEnumerable<CPos> CandidateMovementCells(Actor self)
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{
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var map = self.World.Map;
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var maxCells = (maxRange.Length + 1023) / 1024;
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var minCells = minRange.Length / 1024;
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var outerSq = maxRange.LengthSquared;
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var innerSq = minRange.LengthSquared;
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var center = Target.CenterPosition;
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return map.FindTilesInAnnulus(targetPosition, minCells + 1, maxCells).Where(c =>
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{
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var dxSq = (map.CenterOfCell(c) - center).HorizontalLengthSquared;
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return dxSq >= innerSq && dxSq <= outerSq;
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});
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}
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}
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}
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