Add chapter: 17

src/damage_system.rs

@@ -1,7 +1,7 @@
 use rltk::console;
 use specs::prelude::*;
 
-use crate::{Name, RunState};
+use crate::{Map, Name, Position, RunState};
 use crate::components::{CombatStats, Player, SufferDamage};
 use crate::gamelog::GameLog;
 
@@ -11,13 +11,20 @@ impl<'a> System<'a> for DamageSystem {
     type SystemData = (
         WriteStorage<'a, CombatStats>,
         WriteStorage<'a, SufferDamage>,
+        ReadStorage<'a, Position>,
+        WriteExpect<'a, Map>,
+        Entities<'a>
     );
 
     fn run(&mut self, data: Self::SystemData) {
-        let (mut stats, mut damage) = data;
+        let (mut stats, mut damage, positions, mut map, entities) = data;
 
-        for (mut stats, damage) in (&mut stats, &damage).join() {
+        for (entity, mut stats, damage) in (&entities, &mut stats, &damage).join() {
             stats.hp -= damage.amount.iter().sum::<i32>();
+            if let Some(pos) = positions.get(entity) {
+                let idx = map.xy_idx(pos.x, pos.y);
+                map.bloodstains.insert(idx);
+            }
         }
 
         damage.clear();