Complete chapter 2.9

src/components.rs

@@ -16,7 +16,7 @@ pub struct Renderable {
     pub render_order: i32,
 }
 
-#[derive(Component, Debug)]
+#[derive(Component, Debug, Default)]
 pub struct Player {}
 
 #[derive(Component)]
@@ -36,7 +36,7 @@ impl Default for Viewshed {
     }
 }
 
-#[derive(Component, Debug)]
+#[derive(Component, Debug, Default)]
 pub struct Monster {}
 
 #[derive(Component, Debug)]
@@ -52,7 +52,7 @@ impl Name {
     }
 }
 
-#[derive(Component, Debug)]
+#[derive(Component, Debug, Default)]
 pub struct BlocksTile {}
 
 #[derive(Component, Debug)]
@@ -86,7 +86,7 @@ impl SufferDamage {
     }
 }
 
-#[derive(Component, Debug)]
+#[derive(Component, Debug, Default)]
 pub struct Item {}
 
 #[derive(Component, Debug)]
@@ -116,7 +116,7 @@ pub struct WantsToDropItem {
     pub item: Entity,
 }
 
-#[derive(Component, Debug)]
+#[derive(Component, Debug, Default)]
 pub struct Consumable {}
 
 #[derive(Component, Debug)]
@@ -133,3 +133,8 @@ pub struct InflictsDamage {
 pub struct AreaOfEffect {
     pub radius: i32,
 }
+
+#[derive(Component, Debug)]
+pub struct Confusion {
+    pub turns: i32,
+}

src/game_log.rs

@@ -1,3 +1,12 @@
 pub struct GameLog {
     pub entries: Vec<String>,
 }
+
+impl GameLog {
+    pub fn new<S: ToString>(first_entry: S) -> Self {
+        let mut entries: Vec<String> = Vec::new();
+        entries.push(first_entry.to_string());
+
+        GameLog { entries }
+    }
+}

src/inventory_system.rs

@@ -1,7 +1,7 @@
 use crate::{
-    game_log::GameLog, AreaOfEffect, CombatStats, Consumable, InBackpack, InflictsDamage, Map,
-    Name, Position, ProvidesHealing, SufferDamage, WantsToDropItem, WantsToPickupItem,
-    WantsToUseItem,
+    game_log::GameLog, AreaOfEffect, CombatStats, Confusion, Consumable, InBackpack,
+    InflictsDamage, Map, Name, Position, ProvidesHealing, SufferDamage, WantsToDropItem,
+    WantsToPickupItem, WantsToUseItem,
 };
 use specs::prelude::*;
 
@@ -62,6 +62,7 @@ impl<'a> System<'a> for ItemUseSystem {
         WriteStorage<'a, CombatStats>,
         WriteStorage<'a, SufferDamage>,
         ReadStorage<'a, AreaOfEffect>,
+        WriteStorage<'a, Confusion>,
     );
 
     fn run(&mut self, data: Self::SystemData) {
@@ -78,6 +79,7 @@ impl<'a> System<'a> for ItemUseSystem {
             mut combat_stats,
             mut suffer_damage,
             aoe,
+            mut confused,
         ) = data;
 
         for (entity, useitem) in (&entities, &wants_use).join() {
@@ -164,6 +166,36 @@ impl<'a> System<'a> for ItemUseSystem {
                 }
             }
 
+            // Can it pass along confusion? Note the use of scopes
+            // to escape from the borrow checker!
+            let mut add_confusion = Vec::new();
+            {
+                match confused.get(useitem.item) {
+                    None => {}
+                    Some(confusion) => {
+                        used_item = false;
+
+                        for mob in targets.iter() {
+                            add_confusion.push((*mob, confusion.turns));
+                            if entity == *player_entity {
+                                let mob_name = names.get(*mob).unwrap();
+                                let item_name = names.get(useitem.item).unwrap();
+
+                                gamelog.entries.push(format!(
+                                    "You use {} on {}, confusing them.",
+                                    item_name.name, mob_name.name
+                                ));
+                            }
+                        }
+                    }
+                }
+            }
+            for mob in add_confusion.iter() {
+                confused
+                    .insert(mob.0, Confusion { turns: mob.1 })
+                    .expect("Unable to add confused status");
+            }
+
             // If it's a consumable, delete it on use
             if used_item {
                 let consumable = consumables.get(useitem.item);

src/main.rs

@@ -15,7 +15,7 @@ mod rect;
 mod spawner;
 mod visibility_system;
 
-pub use components::*;
+use components::*;
 use damage_system::DamageSystem;
 pub use game_log::GameLog;
 use inventory_system::{ItemCollectionSystem, ItemDropSystem, ItemUseSystem};
@@ -100,7 +100,7 @@ impl GameState for State {
             let renderables = self.ecs.read_storage::<Renderable>();
             let map = self.ecs.fetch::<Map>();
 
-            let mut data = (&positions, &renderables).join().collect::<Vec<_>>();
+            let mut data: Vec<_> = (&positions, &renderables).join().collect();
             data.sort_by(|&a, &b| b.1.render_order.cmp(&a.1.render_order));
             for (pos, render) in data.iter() {
                 let idx = map.xy_idx(pos.x, pos.y);
@@ -254,6 +254,7 @@ fn main() -> rltk::BError {
         Ranged,
         InflictsDamage,
         AreaOfEffect,
+        Confusion,
     );
 
     let map = Map::new_map_rooms_and_corridors();
@@ -270,9 +271,7 @@ fn main() -> rltk::BError {
     gs.ecs.insert(Point::new(player_x, player_y));
     gs.ecs.insert(player_entity);
     gs.ecs.insert(RunState::PreRun);
-    gs.ecs.insert(game_log::GameLog {
-        entries: vec!["Welcome to Rusty Roguelike".to_string()],
-    });
+    gs.ecs.insert(GameLog::new("Welcome to Rusty Roguelike"));
 
     rltk::main_loop(context, gs)
 }

src/map.rs

@@ -1,4 +1,4 @@
-use super::Rect;
+use crate::Rect;
 use rltk::{Algorithm2D, BaseMap, Point, RandomNumberGenerator, Rltk, SmallVec, RGB};
 use specs::prelude::*;
 use std::cmp::{max, min};

src/monster_ai_system.rs

@@ -1,4 +1,6 @@
-use crate::{Map, Monster, Position, RunState, Viewshed, WantsToMelee};
+use crate::components::{Confusion, Monster, Position, Viewshed, WantsToMelee};
+use crate::{Map, RunState};
+
 use rltk::Point;
 use specs::prelude::*;
 
@@ -16,6 +18,7 @@ impl<'a> System<'a> for MonsterAI {
         ReadStorage<'a, Monster>,
         WriteStorage<'a, Position>,
         WriteStorage<'a, WantsToMelee>,
+        WriteStorage<'a, Confusion>,
     );
 
     fn run(&mut self, data: Self::SystemData) {
@@ -29,6 +32,7 @@ impl<'a> System<'a> for MonsterAI {
             monster,
             mut position,
             mut wants_to_melee,
+            mut confused,
         ) = data;
 
         if *runstate != RunState::MonsterTurn {
@@ -38,6 +42,19 @@ impl<'a> System<'a> for MonsterAI {
         for (entity, mut viewshed, _monster, mut pos) in
             (&entities, &mut viewshed, &monster, &mut position).join()
         {
+            let mut can_act = true;
+
+            let is_confused = confused.get_mut(entity);
+            if let Some(i_am_confused) = is_confused {
+                i_am_confused.turns -= 1;
+                if i_am_confused.turns < 1 {
+                    confused.remove(entity);
+                }
+
+                can_act = false;
+            }
+
+            if can_act {
                 let distance =
                     rltk::DistanceAlg::Pythagoras.distance2d(Point::new(pos.x, pos.y), *player_pos);
                 if distance < 1.5 {
@@ -51,6 +68,7 @@ impl<'a> System<'a> for MonsterAI {
                         )
                         .expect("Unable to insert attack");
                 } else if viewshed.visible_tiles.contains(&*player_pos) {
+                    // The path to the player
                     let path = rltk::a_star_search(
                         map.xy_idx(pos.x, pos.y) as i32,
                         map.xy_idx(player_pos.x, player_pos.y) as i32,
@@ -72,3 +90,4 @@ impl<'a> System<'a> for MonsterAI {
             }
         }
     }
+}

src/spawner.rs

@@ -1,7 +1,8 @@
-use crate::{
-    AreaOfEffect, BlocksTile, CombatStats, Consumable, InflictsDamage, Item, Monster, Name, Player,
-    Position, ProvidesHealing, Ranged, Rect, Renderable, Viewshed, MAP_WIDTH,
+use crate::components::{
+    AreaOfEffect, BlocksTile, CombatStats, Confusion, Consumable, InflictsDamage, Item, Monster,
+    Name, Player, Position, ProvidesHealing, Ranged, Renderable, Viewshed,
 };
+use crate::{Rect, MAP_WIDTH};
 use rltk::{RandomNumberGenerator, RGB};
 use specs::prelude::*;
 
@@ -172,12 +173,13 @@ fn random_item(ecs: &mut World, x: i32, y: i32) {
     let roll: i32;
     {
         let mut rng = ecs.write_resource::<RandomNumberGenerator>();
-        roll = rng.roll_dice(1, 3);
+        roll = rng.roll_dice(1, 4);
     }
 
     match roll {
         1 => health_potion(ecs, x, y),
         2 => fireball_scroll(ecs, x, y),
+        3 => confusion_scroll(ecs, x, y),
         _ => magic_missile_scroll(ecs, x, y),
     }
 }
@@ -199,3 +201,20 @@ fn fireball_scroll(ecs: &mut World, x: i32, y: i32) {
         .with(AreaOfEffect { radius: 3 })
         .build();
 }
+
+fn confusion_scroll(ecs: &mut World, x: i32, y: i32) {
+    ecs.create_entity()
+        .with(Position { x, y })
+        .with(Renderable {
+            glyph: rltk::to_cp437(')'),
+            fg: RGB::named(rltk::PINK),
+            bg: RGB::named(rltk::BLACK),
+            render_order: 2,
+        })
+        .with(Name::new("Confusion Scroll"))
+        .with(Item {})
+        .with(Consumable {})
+        .with(Ranged { range: 6 })
+        .with(Confusion { turns: 4 })
+        .build();
+}