Complete section 3.7

src/visibility_system.rs

@@ -1,20 +1,28 @@
-use crate::{Map, Player, Position, Viewshed};
+use crate::{
+    components::Hidden, components::Name, game_log::GameLog, Map, Player, Position, Viewshed,
+};
 use rltk::{field_of_view, Point};
 use specs::prelude::*;
 
 pub struct VisibilitySystem {}
 
 impl<'a> System<'a> for VisibilitySystem {
+    #[allow(clippy::type_complexity)]
     type SystemData = (
         WriteExpect<'a, Map>,
         Entities<'a>,
         WriteStorage<'a, Viewshed>,
-        WriteStorage<'a, Position>,
+        ReadStorage<'a, Position>,
         ReadStorage<'a, Player>,
+        WriteStorage<'a, Hidden>,
+        WriteExpect<'a, rltk::RandomNumberGenerator>,
+        WriteExpect<'a, GameLog>,
+        ReadStorage<'a, Name>,
     );
 
     fn run(&mut self, data: Self::SystemData) {
-        let (mut map, entities, mut viewshed, pos, player) = data;
+        let (mut map, entities, mut viewshed, pos, player, mut hidden, mut rng, mut log, names) =
+            data;
 
         for (ent, viewshed, pos) in (&entities, &mut viewshed, &pos).join() {
             if viewshed.dirty {
@@ -31,10 +39,24 @@ impl<'a> System<'a> for VisibilitySystem {
                     for t in map.visible_tiles.iter_mut() {
                         *t = false
                     }
+
                     for vis in viewshed.visible_tiles.iter() {
                         let idx = map.xy_idx(vis.x, vis.y);
                         map.revealed_tiles[idx] = true;
                         map.visible_tiles[idx] = true;
+
+                        // Chance to reveal hidden things
+                        for e in map.tile_content[idx].iter() {
+                            if let Some(_maybe_hidden) = hidden.get(*e) {
+                                if rng.roll_dice(1, 24) == 1 {
+                                    if let Some(name) = names.get(*e) {
+                                        log.append(format!("You spotted a {}.", &name.name));
+                                    }
+
+                                    hidden.remove(*e);
+                                }
+                            }
+                        }
                     }
                 }
             }