74da2a2c72
Allows to customize the victim scan radius. Necessary to ensure that actors where health radius is close enough, but CenterPosition isn't, properly receive damage.
90 lines
2.7 KiB
C#
90 lines
2.7 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;
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using System.Collections.Generic;
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using OpenRA.Traits;
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namespace OpenRA.Mods.Common.Warheads
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{
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public class SpreadDamageWarhead : DamageWarhead
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{
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[Desc("Range between falloff steps.")]
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public readonly WDist Spread = new WDist(43);
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[Desc("Extra search radius beyond maximum spread. Required to ensure damage to actors with large health radius.")]
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public readonly WDist TargetExtraSearchRadius = new WDist(2048);
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[Desc("Damage percentage at each range step")]
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public readonly int[] Falloff = { 100, 37, 14, 5, 2, 1, 0 };
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[Desc("Ranges at which each Falloff step is defined. Overrides Spread.")]
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public WDist[] Range = null;
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public void InitializeRange()
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{
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if (Range != null)
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{
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if (Range.Length != 1 && Range.Length != Falloff.Length)
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throw new InvalidOperationException("Number of range values must be 1 or equal to the number of Falloff values.");
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for (var i = 0; i < Range.Length - 1; i++)
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if (Range[i] > Range[i + 1])
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throw new InvalidOperationException("Range values must be specified in an increasing order.");
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}
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else
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Range = Exts.MakeArray(Falloff.Length, i => i * Spread);
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}
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public override void DoImpact(WPos pos, Actor firedBy, IEnumerable<int> damageModifiers)
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{
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if (Range == null)
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InitializeRange();
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var world = firedBy.World;
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// This only finds actors where the center is within the search radius,
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// so we need to search beyond the maximum spread to account for actors with large health radius
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var hitActors = world.FindActorsInCircle(pos, Range[Range.Length - 1] + TargetExtraSearchRadius);
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foreach (var victim in hitActors)
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{
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if (!IsValidAgainst(victim, firedBy))
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continue;
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var localModifiers = damageModifiers;
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var healthInfo = victim.Info.TraitInfoOrDefault<HealthInfo>();
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if (healthInfo != null)
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{
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var distance = Math.Max(0, (victim.CenterPosition - pos).Length - healthInfo.Radius.Length);
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localModifiers = localModifiers.Append(GetDamageFalloff(distance));
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}
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DoImpact(victim, firedBy, localModifiers);
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}
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}
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int GetDamageFalloff(int distance)
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{
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var inner = Range[0].Length;
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for (var i = 1; i < Range.Length; i++)
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{
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var outer = Range[i].Length;
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if (outer > distance)
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return int2.Lerp(Falloff[i - 1], Falloff[i], distance - inner, outer - inner);
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inner = outer;
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}
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return 0;
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}
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}
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}
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