How is the damage determined?

[powershot]

Mmm... math... yummy...

So is Pi.

[Caphriel]

From actions.cpp:

Code: Select all

01062         // Compute base damage done with the weapon.
01063         int base_damage = weapon->damage();
01064         unit_ability_list dmg_specials = weapon->get_specials("damage");
01065         unit_abilities::effect dmg_effect(dmg_specials, base_damage, backstab_pos);
01066         base_damage = dmg_effect.get_composite_value();
01067 
01068         // Get the damage multiplier applied to the base damage of the weapon.
01069         int damage_multiplier = 100;
01070 
01071         // Time of day bonus.
01072         damage_multiplier += combat_modifier(u_loc, u.alignment(), u.is_fearless());
01073 
01074         // Leadership bonus.
01075         int leader_bonus = 0;
01076         if (under_leadership(units, u_loc, &leader_bonus).valid())
01077             damage_multiplier += leader_bonus;
01078 
01079         // Resistance modifier.
01080         damage_multiplier *= opp.damage_from(*weapon, !attacking, opp_loc);
01081 
01082         // Compute both the normal and slowed damage. For the record,
01083         // drain = normal damage / 2 and slow_drain = slow_damage / 2.
01084         damage = round_damage(base_damage, damage_multiplier, 10000);

So the damage multiplier starts at 100 (percent), is modified additively by time of day and leadership, and then multiplicatively by resistance. Just to confirm Dunno's test conclusively

And then here's the round_damage function, from util.hpp, with a handy comment explaining how rounding works:

Code: Select all

00044 /**
00045  *  round (base_damage * bonus / divisor) to the closest integer,
00046  *  but up or down towards base_damage
00047  */
00048 inline int round_damage(int base_damage, int bonus, int divisor) {
00049     if (base_damage==0) return 0;
00050     const int rounding = divisor / 2 - (bonus < divisor || divisor==1 ? 0 : 1);
00051     return std::max<int>(1, (base_damage * bonus + rounding) / divisor);
00052 }

Hope that clears things up!

[Colouredbox]

This has been bothering me quite some time and this seems like a nice topic to ask it.

Are backstab and charge calculated as -100% resistance, or just doubling the damage when it has been rounded?

[Kymille]

Are backstab and charge calculated as -100% resistance, or just doubling the damage when it has been rounded?

The code snippet above suggests the answer is neither. Backstab and charge are applied first, before resistances or time-of-day. Since you start with an integer, doubling it means that there is no rounding involved.

Of course, I could be reading it wrong.

[Colouredbox]

Are backstab and charge calculated as -100% resistance, or just doubling the damage when it has been rounded?

The code snippet above suggests the answer is neither. Backstab and charge are applied first, before resistances or time-of-day. Since you start with an integer, doubling it means that there is no rounding involved.

Of course, I could be reading it wrong.

Okay