Everything is now OpenRA, not OpenRa

OpenRA.Game/Combat.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007,2009,2010 Chris Forbes, Robert Pepperell, Matthew Bowra-Dean, Paul Chote, Alli Witheford.
+ * This file is part of OpenRA.
+ * 
+ *  OpenRA is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ * 
+ *  OpenRA is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ * 
+ *  You should have received a copy of the GNU General Public License
+ *  along with OpenRA.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#endregion
+
+using System;
+using System.Linq;
+using OpenRA.Effects;
+using OpenRA.GameRules;
+using OpenRA.Traits;
+
+namespace OpenRA
+{
+	static class Combat			/* some utility bits that are shared between various things */
+	{
+		public static void DoImpact(int2 loc, int2 visualLoc,
+			WeaponInfo weapon, ProjectileInfo projectile, WarheadInfo warhead, Actor firedBy)
+		{
+			var world = firedBy.World;
+
+			var targetTile = ((1f / Game.CellSize) * loc.ToFloat2()).ToInt2();
+
+			var isWater = world.IsWater(targetTile);
+			var hitWater = world.IsCellBuildable(targetTile, UnitMovementType.Float);
+
+			if (warhead.Explosion != 0)
+				world.AddFrameEndTask(
+					w => w.Add(new Explosion(w, visualLoc, warhead.Explosion, hitWater)));
+
+			var impactSound = warhead.ImpactSound;
+			if (hitWater && warhead.WaterImpactSound != null)
+				impactSound = warhead.WaterImpactSound;
+			if (impactSound != null) Sound.Play(impactSound + ".aud");
+
+			if (!isWater) world.Map.AddSmudge(targetTile, warhead);
+			if (warhead.Ore) world.Map.DestroyOre(targetTile.X, targetTile.Y);
+
+			var firepowerModifier = firedBy.traits
+				.WithInterface<IFirepowerModifier>()
+				.Select(a => a.GetFirepowerModifier())
+				.Product();
+
+			var maxSpread = GetMaximumSpread(weapon, warhead, firepowerModifier);
+			var hitActors = world.FindUnitsInCircle(loc, maxSpread);
+			
+			foreach (var victim in hitActors)
+				victim.InflictDamage(firedBy, 
+					(int)GetDamageToInflict(victim, loc, weapon, warhead, firepowerModifier), warhead);
+		}
+
+		static float GetMaximumSpread(WeaponInfo weapon, WarheadInfo warhead, float modifier)
+		{
+			return (int)(warhead.Spread * Math.Log(Math.Abs(weapon.Damage * modifier), 2));
+		}
+
+		static float GetDamageToInflict(Actor target, int2 loc, WeaponInfo weapon, WarheadInfo warhead, float modifier)
+		{
+			if (!WeaponValidForTarget(weapon, target))
+				return 0f;
+			
+			var distance = (target.CenterLocation - loc).Length*1/24f;
+			var rawDamage = weapon.Damage * modifier * (float)Math.Exp(-distance / warhead.Spread);
+			var multiplier = warhead.EffectivenessAgainst(target.Info.Traits.Get<OwnedActorInfo>().Armor);
+			return rawDamage * multiplier;
+		}
+
+		public static bool WeaponValidForTarget(WeaponInfo weapon, Actor target)
+		{
+			var projectile = Rules.ProjectileInfo[weapon.Projectile];
+			var warhead = Rules.WarheadInfo[weapon.Warhead];
+			var unit = target.traits.GetOrDefault<Unit>();
+
+			if (warhead.EffectivenessAgainst(target.Info.Traits.Get<OwnedActorInfo>().Armor) <= 0)
+				return false;
+
+			if (target.traits.Contains<Submarine>())
+				return projectile.ASW;
+
+			if (unit != null && unit.Altitude > 0)
+				return projectile.AA;
+
+			if (projectile.UnderWater && !target.Info.Traits.Get<OwnedActorInfo>().WaterBound)
+				return false;
+
+			return projectile.AG;
+		}
+
+		public static bool HasAnyValidWeapons(Actor self, Actor target)
+		{
+			var info = self.Info.Traits.Get<AttackBaseInfo>();
+			if (info.PrimaryWeapon != null &&
+				WeaponValidForTarget(self.GetPrimaryWeapon(), target)) return true;
+			if (info.SecondaryWeapon != null &&
+				WeaponValidForTarget(self.GetSecondaryWeapon(), target)) return true;
+
+			return false;
+		}
+	}
+}