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();

src/map.rs

@@ -1,4 +1,5 @@
 use std::cmp::{max, min};
+use std::collections::HashSet;
 
 use rltk::{Algorithm2D, BaseMap, FontCharType, Point, RandomNumberGenerator, RGB, Rltk};
 use serde::{Deserialize, Serialize};
@@ -28,6 +29,7 @@ pub struct Map {
     pub visible_tiles: Vec<bool>,
     pub blocked: Vec<bool>,
     pub depth: i32,
+    pub bloodstains: HashSet<usize>,
 
     #[serde(skip_serializing)]
     #[serde(skip_deserializing)]
@@ -97,6 +99,7 @@ impl Map {
             blocked: vec![false; MAP_COUNT],
             tile_content: vec![Vec::new(); MAP_COUNT],
             depth: new_depth,
+            bloodstains: HashSet::new(),
         };
 
         const MAX_ROOMS: i32 = 30;
@@ -207,6 +210,7 @@ pub fn draw_map(ecs: &World, ctx: &mut Rltk) {
         if map.revealed_tiles[idx] {
             let glyph;
             let mut fg;
+            let mut bg = RGB::from_f32(0., 0., 0.);
             match tile {
                 TileType::Floor => {
                     fg = RGB::from_f32(0.0, 0.5, 0.5);
@@ -223,10 +227,14 @@ pub fn draw_map(ecs: &World, ctx: &mut Rltk) {
                     fg = RGB::from_f32(0., 1., 1.);
                 }
             }
-            if !map.visible_tiles[idx] {
-                fg = fg.to_greyscale()
+            if map.bloodstains.contains(&idx) {
+                bg = RGB::from_f32(0.71, 0., 0.);
             }
-            ctx.set(x, y, fg, RGB::from_f32(0., 0., 0.), glyph);
+            if !map.visible_tiles[idx] {
+                fg = fg.to_greyscale();
+                bg = RGB::from_f32(0., 0., 0.);
+            }
+            ctx.set(x, y, fg, bg, glyph);
         }
 
         x += 1;