Create a new damage model for the MAD Tank. Fixes #4105

OpenRA.Game/GameRules/WeaponInfo.cs

@@ -47,8 +47,6 @@ namespace OpenRA.GameRules
 		public readonly DamageModel DamageModel = DamageModel.Normal;
 		[Desc("Whether we should prevent prone response for infantry.")]
 		public readonly bool PreventProne = false;
-		[Desc("Whether to use the provided Damage value as a maximum health percentage.")]
-		public readonly bool ScaleDamageByTargetHealth = false;
 
 		public float EffectivenessAgainst(ActorInfo ai)
 		{
@@ -83,6 +81,7 @@ namespace OpenRA.GameRules
 	{
 		Normal,								// classic RA damage model: point actors, distance-based falloff
 		PerCell,							// like RA's "nuke damage"
+		HealthPercentage					// for MAD Tank
 	}
 
 	public class ProjectileArgs

OpenRA.Mods.RA/Combat.cs

@@ -122,6 +122,23 @@ namespace OpenRA.Mods.RA
 								unit.InflictDamage(firedBy, damage, warhead);
 							}
 					} break;
+
+				case DamageModel.HealthPercentage:
+					{
+						var range = new WRange(warhead.Size[0] * 1024);
+						var hitActors = world.FindActorsInCircle(pos, range);
+
+						foreach (var victim in hitActors)
+						{
+							var damage = GetDamageToInflict(pos, victim, warhead, weapon, firepowerModifier, false);
+							if (damage != 0) // will be 0 if the target doesn't have HealthInfo
+							{
+								var healthInfo = victim.Info.Traits.Get<HealthInfo>();
+								damage = (float)(damage / 100 * healthInfo.HP);
+							}
+							victim.InflictDamage(firedBy, (int)damage, warhead);
+						}
+					} break;
 			}
 		}
 
@@ -174,8 +191,6 @@ namespace OpenRA.Mods.RA
 				return 0;
 
 			var rawDamage = (float)warhead.Damage;
-			if (warhead.ScaleDamageByTargetHealth)
-				rawDamage = (float)(rawDamage / 100 * healthInfo.HP);
 			if (withFalloff)
 			{
 				var distance = (int)Math.Max(0, (target.CenterPosition - pos).Length * Game.CellSize / 1024 - healthInfo.Radius);

mods/ra/weapons.yaml

@@ -1331,9 +1331,8 @@ Mandible:
 MADTankThump:
 	InvalidTargets: MADTank
 	Warhead:
-		DamageModel: PerCell
+		DamageModel: HealthPercentage
 		Damage: 1
-		ScaleDamageByTargetHealth: True
 		Versus:
 			None: 0%
 		Size: 7,6
@@ -1341,9 +1340,8 @@ MADTankThump:
 MADTankDetonate:
 	InvalidTargets: MADTank
 	Warhead:
-		DamageModel: PerCell
+		DamageModel: HealthPercentage
 		Damage: 19
-		ScaleDamageByTargetHealth: True
 		Versus:
 			None: 0%
 		Size: 7,6