98 lines
3.0 KiB
C#
98 lines
3.0 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2018 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.Linq;
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using OpenRA.Primitives;
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using OpenRA.Traits;
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namespace OpenRA.Mods.Common.Traits
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{
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[Desc("This actor receives damage from the given weapon when on the specified terrain type.")]
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class DamagedByTerrainInfo : ConditionalTraitInfo, Requires<HealthInfo>
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{
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[Desc("Amount of damage received per DamageInterval ticks.")]
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[FieldLoader.Require] public readonly int Damage = 0;
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[Desc("Delay between receiving damage.")]
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public readonly int DamageInterval = 0;
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[Desc("Apply the damage using these damagetypes.")]
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public readonly BitSet<DamageType> DamageTypes = default(BitSet<DamageType>);
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[Desc("Terrain types where the actor will take damage.")]
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[FieldLoader.Require] public readonly string[] Terrain = { };
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[Desc("Percentage health below which the actor will not receive further damage.")]
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public readonly int DamageThreshold = 0;
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[Desc("Inflict damage down to the DamageThreshold when the actor gets created on damaging terrain.")]
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public readonly bool StartOnThreshold = false;
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public override object Create(ActorInitializer init) { return new DamagedByTerrain(init.Self, this); }
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}
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class DamagedByTerrain : ConditionalTrait<DamagedByTerrainInfo>, ITick, ISync, INotifyAddedToWorld
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{
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readonly Health health;
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[Sync] int damageTicks;
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[Sync] int damageThreshold;
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public DamagedByTerrain(Actor self, DamagedByTerrainInfo info) : base(info)
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{
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health = self.Trait<Health>();
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}
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void INotifyAddedToWorld.AddedToWorld(Actor self)
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{
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if (!Info.StartOnThreshold)
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return;
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var safeTiles = 0;
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var totalTiles = 0;
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foreach (var kv in self.OccupiesSpace.OccupiedCells())
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{
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totalTiles++;
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if (!Info.Terrain.Contains(self.World.Map.GetTerrainInfo(kv.First).Type))
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safeTiles++;
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}
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if (totalTiles == 0)
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return;
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// Cast to long to avoid overflow when multiplying by the health
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damageThreshold = (int)((Info.DamageThreshold * (long)health.MaxHP + (100 - Info.DamageThreshold) * safeTiles * (long)health.MaxHP / totalTiles) / 100);
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// Actors start with maximum damage applied
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var delta = health.HP - damageThreshold;
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if (delta > 0)
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self.InflictDamage(self.World.WorldActor, new Damage(delta, Info.DamageTypes));
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}
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void ITick.Tick(Actor self)
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{
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if (IsTraitDisabled || health.HP <= damageThreshold || --damageTicks > 0)
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return;
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// Prevents harming cargo.
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if (!self.IsInWorld)
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return;
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var t = self.World.Map.GetTerrainInfo(self.Location);
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if (!Info.Terrain.Contains(t.Type))
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return;
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self.InflictDamage(self.World.WorldActor, new Damage(Info.Damage, Info.DamageTypes));
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damageTicks = Info.DamageInterval;
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}
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}
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}
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