roguelike-game/src/melee_combat_system.rs

85 lines
2.8 KiB
Rust
Raw Normal View History

use crate::components::{
CombatStats, DefenseBonus, Equipped, MeleePowerBonus, Name, SufferDamage, WantsToMelee,
};
use crate::game_log::GameLog;
2021-10-29 15:15:22 -04:00
use specs::prelude::*;
pub struct MeleeCombatSystem {}
impl<'a> System<'a> for MeleeCombatSystem {
type SystemData = (
Entities<'a>,
WriteExpect<'a, GameLog>,
2021-10-29 15:15:22 -04:00
WriteStorage<'a, WantsToMelee>,
ReadStorage<'a, Name>,
ReadStorage<'a, CombatStats>,
WriteStorage<'a, SufferDamage>,
ReadStorage<'a, MeleePowerBonus>,
ReadStorage<'a, DefenseBonus>,
ReadStorage<'a, Equipped>,
2021-10-29 15:15:22 -04:00
);
fn run(&mut self, data: Self::SystemData) {
let (
entities,
mut log,
mut wants_melee,
names,
combat_stats,
mut inflict_damage,
melee_power_bonuses,
defense_bonuses,
equipped,
) = data;
2021-10-29 15:15:22 -04:00
for (entity, wants_melee, name, stats) in
2021-10-29 15:15:22 -04:00
(&entities, &wants_melee, &names, &combat_stats).join()
{
if stats.hp > 0 {
let mut offensive_bonus = 0;
for (_item_entity, power_bonus, equipped_by) in
(&entities, &melee_power_bonuses, &equipped).join()
{
if equipped_by.owner == entity {
offensive_bonus += power_bonus.power;
}
}
2021-10-29 15:15:22 -04:00
let target_stats = combat_stats.get(wants_melee.target).unwrap();
if target_stats.hp > 0 {
let target_name = names.get(wants_melee.target).unwrap();
let mut defensive_bonus = 0;
for (_item_entity, defense_bonus, equipped_by) in
(&entities, &defense_bonuses, &equipped).join()
{
if equipped_by.owner == wants_melee.target {
defensive_bonus += defense_bonus.defense;
}
}
let damage = i32::max(
0,
(stats.power + offensive_bonus) - (target_stats.defense + defensive_bonus),
);
2021-10-29 15:15:22 -04:00
if damage == 0 {
log.entries.push(format!(
2021-10-29 15:15:22 -04:00
"{} is unable to hurt {}",
&name.name, &target_name.name
));
} else {
log.entries.push(format!(
2021-10-29 15:15:22 -04:00
"{} hits {}, for {} hp",
&name.name, &target_name.name, damage
));
SufferDamage::new_damage(&mut inflict_damage, wants_melee.target, damage);
}
}
}
}
wants_melee.clear();
}
}