Implement bloodstains

src/damage_system.rs

@@ -1,4 +1,5 @@
-use crate::{game_log::GameLog, CombatStats, Name, Player, RunState, SufferDamage};
+use crate::components::{CombatStats, Name, Player, SufferDamage};
+use crate::{game_log::GameLog, Map, Position, RunState};
 use specs::prelude::*;
 
 pub struct DamageSystem {}
@@ -7,13 +8,21 @@ 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

@@ -3,6 +3,7 @@ use rltk::{Algorithm2D, BaseMap, Point, RandomNumberGenerator, Rltk, SmallVec, R
 use serde::{Deserialize, Serialize};
 use specs::prelude::*;
 use std::cmp::{max, min};
+use std::collections::HashSet;
 
 pub const MAP_WIDTH: usize = 80;
 pub const MAP_HEIGHT: usize = 43;
@@ -25,6 +26,7 @@ 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)]
@@ -100,6 +102,7 @@ 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;
@@ -219,6 +222,7 @@ 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 => {
@@ -235,11 +239,16 @@ pub fn draw_map(ecs: &World, ctx: &mut Rltk) {
                 }
             }
 
-            if !map.visible_tiles[idx] {
-                fg = fg.to_greyscale();
+            if map.bloodstains.contains(&idx) {
+                bg = RGB::from_f32(0.75, 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);
         }
 
         // Move to the next set of coordinates