90 lines
2.6 KiB
C#
90 lines
2.6 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2020 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.Collections.Generic;
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using OpenRA.Activities;
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using OpenRA.Mods.Common.Traits;
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using OpenRA.Primitives;
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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 VisualMoveIntoTarget : Activity
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{
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readonly Mobile mobile;
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readonly Target target;
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readonly Color? targetLineColor;
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readonly WDist targetMovementThreshold;
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WPos targetStartPos;
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public VisualMoveIntoTarget(Actor self, in Target target, WDist targetMovementThreshold, Color? targetLineColor = null)
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{
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mobile = self.Trait<Mobile>();
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this.target = target;
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this.targetMovementThreshold = targetMovementThreshold;
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this.targetLineColor = targetLineColor;
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}
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protected override void OnFirstRun(Actor self)
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{
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targetStartPos = target.Positions.PositionClosestTo(self.CenterPosition);
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}
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public override bool Tick(Actor self)
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{
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if (IsCanceling || target.Type == TargetType.Invalid)
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return true;
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if (mobile.IsTraitDisabled || mobile.IsTraitPaused)
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return false;
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var currentPos = self.CenterPosition;
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var targetPos = target.Positions.PositionClosestTo(currentPos);
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// Give up if the target has moved too far
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if (targetMovementThreshold > WDist.Zero && (targetPos - targetStartPos).LengthSquared > targetMovementThreshold.LengthSquared)
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return true;
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// Turn if required
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var delta = targetPos - currentPos;
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var facing = delta.HorizontalLengthSquared != 0 ? delta.Yaw : mobile.Facing;
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if (facing != mobile.Facing)
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{
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mobile.Facing = Util.TickFacing(mobile.Facing, facing, mobile.TurnSpeed);
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return false;
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}
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// Can complete the move in this step
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var speed = mobile.MovementSpeedForCell(self, self.Location);
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if (delta.LengthSquared <= speed * speed)
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{
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mobile.SetVisualPosition(self, targetPos);
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return true;
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}
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// Move towards the target
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mobile.SetVisualPosition(self, currentPos + delta * speed / delta.Length);
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return false;
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}
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public override IEnumerable<Target> GetTargets(Actor self)
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{
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yield return target;
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}
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public override IEnumerable<TargetLineNode> TargetLineNodes(Actor self)
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{
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if (targetLineColor != null)
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yield return new TargetLineNode(target, targetLineColor.Value);
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}
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}
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}
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