//see wiki.warlight.net/index.php/Combat_Basics
private SimulationOutcome SimulateAttack(RegionState source, RegionState target, int armies)
{
//int attackers, int defenders, out int attackersDestroyed, out int defendersDestroyed
int attackingArmies = armies;
int defendingArmies = target.Armies;
var attackersDestroyed = 0;
var defendersDestroyed = 0;
for (int t = 1; t <= attackingArmies; t++) //calculate how much defending armies are destroyed
{
double rand = Rnd.NextDouble();
//60% chance to destroy one defending army
if (rand < AttackFactor)
{
defendersDestroyed++;
}
}
for (int t = 1; t <= defendingArmies; t++) //calculate how much attacking armies are destroyed
{
double rand = Rnd.NextDouble();
//70% chance to destroy one attacking army
if (rand < DefendFactor)
{
attackersDestroyed++;
}
}
if (attackersDestroyed >= attackingArmies)
{
if (defendersDestroyed >= defendingArmies)
{
defendersDestroyed = defendingArmies - 1;
}
attackersDestroyed = attackingArmies;
}
//process result of attack
if (defendersDestroyed >= defendingArmies) //attack success
{
var survivors = attackingArmies - attackersDestroyed;
return(new SimulationOutcome(source.Leave(armies), RegionState.Create(survivors, source.Owner)));
}
else //attack fail
{
return(new SimulationOutcome(source.Leave(attackersDestroyed), target.Leave(defendersDestroyed)));
}
}
public SimulationDistribution Simulate(RegionState source, RegionState target, int armies, int simulations = 1000)
{
if (source.Owner == target.Owner)
{
var outcome = new SimulationOutcome(source.Leave(armies), target.Arive(armies));
return(null);
}
var success = new Dictionary <RegionState, int>();
var failure = new Dictionary <SimulationOutcome, int>();
for (var simulation = 0; simulation < simulations; simulation++)
{
var outcome = SimulateAttack(source, target, armies);
if (outcome.HaveSameOwner)
{
if (!success.ContainsKey(outcome.Target))
{
success[outcome.Target] = 1;
}
else
{
success[outcome.Target]++;
}
}
else
{
if (!failure.ContainsKey(outcome))
{
failure[outcome] = 1;
}
else
{
failure[outcome]++;
}
}
}
return(new SimulationDistribution()
{
Source = source.Leave(armies),
Success = success,
Failure = failure,
});
}