Method GetTimeToLive

engine/Poseidon/AI/AIUnitImpl.cpp:2514–2573

float AIUnit::GetTimeToLive() const
{
    const float MinTimeToLive = 5.0;
    // assume we can live max. 24 hours
    float maxTimeToLive = 3600 * 24.0;
    // when in combat, assume we can live max. 1 hour
    if (GetCombatMode() >= CMCombat)
    {
        maxTimeToLive = 3600;
    }

    if (!GetGroup())
    {
        Fail("No group in GetTimeToLive");
        return MinTimeToLive;
    }

    // exposure is updated quite slowly
    // when we calculate timeToLive from current target,
    // we will almost certainly not underestimate

    /*
    Target *tgt = GetTargetAssigned();
    if (tgt)
    {
        EntityAI *veh = GetVehicle();
        float dist2 = veh->Position().Distance2(tgt->AimingPosition());
        float visibility = 1;
        Threat threat = tgt->type->GetDammagePerMinute(dist2,visibility);
        VehicleKind kind = veh->GetType()->GetKind();
        float dpm = threat[kind];

        if (dpm>0)
        {
            float ttl = 60 * GetVehicle()->GetArmor() / dpm;
            saturateMin(maxTimeToLive,ttl);
        }
    }
    */

    int x = toIntFloor(GetVehicle()->Position().X() * InvLandGrid);
    int z = toIntFloor(GetVehicle()->Position().Z() * InvLandGrid);
    float exposure;
    if (IsHoldingFire())
    {
        exposure = GetGroup()->GetCenter()->GetExposurePessimistic(x, z);
    }
    else
    {
        exposure = GetGroup()->GetCenter()->GetExposureOptimistic(x, z);
    }
    if (exposure <= 0)
    {
        return maxTimeToLive;
    }

    float timeToLive = 60 * GetVehicle()->GetArmor() / exposure;
    saturate(timeToLive, MinTimeToLive, maxTimeToLive);
    return timeToLive;
}