98 lines
2.7 KiB
C#
98 lines
2.7 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2011 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;
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using System.Collections.Generic;
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using System.Linq;
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namespace OpenRA.Traits
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{
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public struct Target
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{
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public static readonly Target[] NoTargets = {};
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public static readonly Target None = new Target();
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Actor actor;
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WPos pos;
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bool valid;
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int generation;
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public static Target FromPos(WPos p) { return new Target { pos = p, valid = true }; }
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public static Target FromPos(PPos p) { return new Target { pos = p.ToWPos(0), valid = true }; }
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public static Target FromCell(CPos c) { return new Target { pos = c.CenterPosition, valid = true }; }
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public static Target FromOrder(Order o)
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{
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return o.TargetActor != null
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? Target.FromActor(o.TargetActor)
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: Target.FromCell(o.TargetLocation);
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}
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public static Target FromActor(Actor a)
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{
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return new Target
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{
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actor = a,
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valid = (a != null),
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generation = a.Generation,
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};
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}
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public bool IsValid { get { return valid && (actor == null || (actor.IsInWorld && !actor.IsDead() && actor.Generation == generation)); } }
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public PPos CenterLocation { get { return IsActor ? actor.CenterLocation : PPos.FromWPos(pos); } }
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public Actor Actor { get { return IsActor ? actor : null; } }
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// TODO: This should return true even if the actor is destroyed
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public bool IsActor { get { return actor != null && !actor.Destroyed; } }
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// Representative position - see Positions for the full set of targetable positions.
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public WPos CenterPosition
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{
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get
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{
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if (!IsValid)
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throw new InvalidOperationException("Attempting to query the position of an invalid Target");
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return actor != null ? actor.CenterPosition : pos;
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}
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}
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// Positions available to target for range checks
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static readonly WPos[] NoPositions = {};
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public IEnumerable<WPos> Positions
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{
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get
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{
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if (!IsValid)
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return NoPositions;
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if (actor == null)
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return new []{pos};
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var targetable = actor.TraitOrDefault<ITargetable>();
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if (targetable == null)
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return new []{actor.CenterPosition};
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return targetable.TargetablePositions(actor);
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}
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}
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public bool IsInRange(WPos origin, WRange range)
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{
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if (!IsValid)
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return false;
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// Target ranges are calculated in 2D, so ignore height differences
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var rangeSquared = range.Range*range.Range;
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return Positions.Any(t => (t - origin).HorizontalLengthSquared <= rangeSquared);
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}
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}
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}
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