Add chapter: 18

src/components.rs

@@ -173,3 +173,8 @@ pub struct DefenseBonus {
 pub struct WantsToRemoveItem {
     pub item: Entity,
 }
+
+#[derive(Component, Serialize, Deserialize, Clone)]
+pub struct ParticleLifetime {
+    pub lifetime_ms: f32,
+}

src/damage_system.rs

@@ -1,9 +1,9 @@
 use rltk::console;
 use specs::prelude::*;
 
-use crate::{Map, Name, Position, RunState};
 use crate::components::{CombatStats, Player, SufferDamage};
 use crate::gamelog::GameLog;
+use crate::{Map, Name, Position, RunState};
 
 pub struct DamageSystem {}
 
@@ -13,7 +13,7 @@ impl<'a> System<'a> for DamageSystem {
         WriteStorage<'a, SufferDamage>,
         ReadStorage<'a, Position>,
         WriteExpect<'a, Map>,
-        Entities<'a>
+        Entities<'a>,
     );
 
     fn run(&mut self, data: Self::SystemData) {

src/gui.rs

@@ -1,14 +1,14 @@
-use rltk::{Rltk};
+use rltk::Rltk;
-use rltk::{Point, VirtualKeyCode};
 use rltk::RGB;
+use rltk::{Point, VirtualKeyCode};
 use specs::prelude::*;
 
-use crate::{CombatStats, InBackpack, RunState, State, Viewshed};
-use crate::{Equipped, Map};
 use crate::gamelog::GameLog;
 use crate::Name;
 use crate::Player;
 use crate::Position;
+use crate::{CombatStats, InBackpack, RunState, State, Viewshed};
+use crate::{Equipped, Map};
 
 pub fn draw_ui(ecs: &World, ctx: &mut Rltk) {
     ctx.draw_box(
@@ -603,17 +603,40 @@ pub fn remove_item_menu(gs: &mut State, ctx: &mut Rltk) -> (ItemMenuResult, Opti
 }
 
 #[derive(PartialEq, Copy, Clone)]
-pub enum GameOverResult { NoSelection, QuitToMenu }
+pub enum GameOverResult {
+    NoSelection,
+    QuitToMenu,
+}
 
 pub fn game_over(ctx: &mut Rltk) -> GameOverResult {
-    ctx.print_color_centered(15, RGB::named(rltk::YELLOW), RGB::named(rltk::BLACK), "Your journey has ended!");
+    ctx.print_color_centered(
-    ctx.print_color_centered(17, RGB::named(rltk::WHITE), RGB::named(rltk::BLACK), "One day, we'll tell you all about how you did.");
+        15,
-    ctx.print_color_centered(18, RGB::named(rltk::WHITE), RGB::named(rltk::BLACK), "That day, sadly, is not in this chapter..");
+        RGB::named(rltk::YELLOW),
+        RGB::named(rltk::BLACK),
+        "Your journey has ended!",
+    );
+    ctx.print_color_centered(
+        17,
+        RGB::named(rltk::WHITE),
+        RGB::named(rltk::BLACK),
+        "One day, we'll tell you all about how you did.",
+    );
+    ctx.print_color_centered(
+        18,
+        RGB::named(rltk::WHITE),
+        RGB::named(rltk::BLACK),
+        "That day, sadly, is not in this chapter..",
+    );
 
-    ctx.print_color_centered(20, RGB::named(rltk::MAGENTA), RGB::named(rltk::BLACK), "Press any key to return to the menu.");
+    ctx.print_color_centered(
+        20,
+        RGB::named(rltk::MAGENTA),
+        RGB::named(rltk::BLACK),
+        "Press any key to return to the menu.",
+    );
 
     match ctx.key {
         None => GameOverResult::NoSelection,
-        Some(_) => GameOverResult::QuitToMenu
+        Some(_) => GameOverResult::QuitToMenu,
     }
 }

src/inventory_system.rs

@@ -1,6 +1,7 @@
 use specs::prelude::*;
 
 use crate::gamelog::GameLog;
+use crate::particle_system::ParticleBuilder;
 use crate::{
     AreaOfEffect, CombatStats, Confusion, Consumable, Equippable, Equipped, InBackpack,
     InflictsDamage, Map, Name, Position, ProvidesHealing, Ranged, SufferDamage, WantsToDropItem,
@@ -69,6 +70,8 @@ impl<'a> System<'a> for ItemUseSystem {
         ReadStorage<'a, Equippable>,
         WriteStorage<'a, Equipped>,
         WriteStorage<'a, InBackpack>,
+        WriteExpect<'a, ParticleBuilder>,
+        ReadStorage<'a, Position>,
     );
 
     fn run(&mut self, data: Self::SystemData) {
@@ -90,6 +93,8 @@ impl<'a> System<'a> for ItemUseSystem {
             equippable,
             mut equipped,
             mut backpack,
+            mut particle_builder,
+            positions,
         ) = data;
 
         for (entity, use_item) in (&entities, &wants_use).join() {
@@ -118,8 +123,17 @@ impl<'a> System<'a> for ItemUseSystem {
                                 for mob in map.tile_content[idx].iter() {
                                     targets.push(*mob);
                                 }
+
+                                particle_builder.request(
+                                    tile_idx.x,
+                                    tile_idx.y,
+                                    rltk::RGB::named(rltk::ORANGE),
+                                    rltk::RGB::named(rltk::BLACK),
+                                    rltk::to_cp437('░'),
+                                    200.,
+                                );
                             }
-                        }
+
                     }
                 }
             }
@@ -172,6 +186,17 @@ impl<'a> System<'a> for ItemUseSystem {
                             "You use {} on {}, inflicting {} hp.",
                             item_name.name, mob_name.name, item_damages.damage
                         ));
+
+                        if let Some(pos) = positions.get(*mob) {
+                            particle_builder.request(
+                                pos.x,
+                                pos.y,
+                                rltk::RGB::named(rltk::RED),
+                                rltk::RGB::named(rltk::BLACK),
+                                rltk::to_cp437('‼'),
+                                200.,
+                            );
+                        }
                     }
 
                     used_item = true;
@@ -192,6 +217,16 @@ impl<'a> System<'a> for ItemUseSystem {
                             ));
                         }
                         used_item = true;
+                        if let Some(pos) = positions.get(*target) {
+                            particle_builder.request(
+                                pos.x,
+                                pos.y,
+                                rltk::RGB::named(rltk::GREEN),
+                                rltk::RGB::named(rltk::BLACK),
+                                rltk::to_cp437('♥'),
+                                200.,
+                            );
+                        }
                     }
                 }
             }
@@ -209,6 +244,17 @@ impl<'a> System<'a> for ItemUseSystem {
                                 "You use {} on {}, confusing them.",
                                 item_name.name, mob_name.name
                             ));
+
+                            if let Some(pos) = positions.get(*mob) {
+                                particle_builder.request(
+                                    pos.x,
+                                    pos.y,
+                                    rltk::RGB::named(rltk::MAGENTA),
+                                    rltk::RGB::named(rltk::BLACK),
+                                    rltk::to_cp437('?'),
+                                    200.,
+                                );
+                            }
                         }
                     }
                 }

src/main.rs

@@ -14,7 +14,10 @@ use player::*;
 use visibility_system::*;
 
 use crate::gamelog::GameLog;
-use crate::inventory_system::{ItemCollectionSystem, ItemDropSystem, ItemRemoveSystem, ItemUseSystem};
+use crate::inventory_system::{
+    ItemCollectionSystem, ItemDropSystem, ItemRemoveSystem, ItemUseSystem,
+};
+use crate::particle_system::ParticleSpawnSystem;
 
 mod components;
 mod damage_system;
@@ -25,6 +28,7 @@ mod map;
 mod map_indexing_system;
 mod melee_combat_system;
 mod monster_ai_system;
+mod particle_system;
 mod player;
 mod random_table;
 mod rect;
@@ -221,6 +225,9 @@ impl State {
         let mut remove_items = ItemRemoveSystem {};
         remove_items.run_now(&self.ecs);
 
+        let mut particle_spawn = ParticleSpawnSystem {};
+        particle_spawn.run_now(&self.ecs);
+
         self.ecs.maintain();
     }
 }
@@ -234,6 +241,7 @@ impl GameState for State {
         }
 
         ctx.cls();
+        particle_system::cull_dead_particles(&mut self.ecs, ctx);
 
         match new_run_state {
             RunState::MainMenu { .. } => {}
@@ -392,7 +400,9 @@ impl GameState for State {
                     gui::GameOverResult::NoSelection => {}
                     gui::GameOverResult::QuitToMenu => {
                         self.game_over_cleanup();
-                        new_run_state = RunState::MainMenu { menu_selection: gui::MainMenuSelection::NewGame };
+                        new_run_state = RunState::MainMenu {
+                            menu_selection: gui::MainMenuSelection::NewGame,
+                        };
                     }
                 }
             }
@@ -417,6 +427,7 @@ fn main() -> rltk::BError {
     let mut gs = State { ecs: World::new() };
 
     gs.ecs.insert(rltk::RandomNumberGenerator::new());
+    gs.ecs.insert(particle_system::ParticleBuilder::new());
 
     gs.ecs.register::<Position>();
     gs.ecs.register::<Renderable>();
@@ -446,6 +457,7 @@ fn main() -> rltk::BError {
     gs.ecs.register::<MeleePowerBonus>();
     gs.ecs.register::<DefenseBonus>();
     gs.ecs.register::<WantsToRemoveItem>();
+    gs.ecs.register::<ParticleLifetime>();
 
     gs.ecs.insert(SimpleMarkerAllocator::<SerializeMe>::new());
 

src/map.rs

@@ -1,7 +1,7 @@
 use std::cmp::{max, min};
 use std::collections::HashSet;
 
-use rltk::{Algorithm2D, BaseMap, FontCharType, Point, RandomNumberGenerator, RGB, Rltk};
+use rltk::{Algorithm2D, BaseMap, FontCharType, Point, RandomNumberGenerator, Rltk, RGB};
 use serde::{Deserialize, Serialize};
 use specs::prelude::*;
 
@@ -246,32 +246,42 @@ pub fn draw_map(ecs: &World, ctx: &mut Rltk) {
 }
 
 fn wall_glyph(map: &Map, x: i32, y: i32) -> FontCharType {
-    if x < 1 || x > map.width - 2 || y < 1 || y > map.height - 2 as i32 { return 35; }
+    if x < 1 || x > map.width - 2 || y < 1 || y > map.height - 2 as i32 {
+        return 35;
+    }
     let mut mask: u8 = 0;
 
-    if is_revealed_and_wall(map, x, y - 1) { mask += 1; }
+    if is_revealed_and_wall(map, x, y - 1) {
-    if is_revealed_and_wall(map, x, y + 1) { mask += 2; }
+        mask += 1;
-    if is_revealed_and_wall(map, x - 1, y) { mask += 4; }
+    }
-    if is_revealed_and_wall(map, x + 1, y) { mask += 8; }
+    if is_revealed_and_wall(map, x, y + 1) {
+        mask += 2;
+    }
+    if is_revealed_and_wall(map, x - 1, y) {
+        mask += 4;
+    }
+    if is_revealed_and_wall(map, x + 1, y) {
+        mask += 8;
+    }
 
     match mask {
-        0 => { 9 } // Pillar because we can't see neighbors
+        0 => 9,    // Pillar because we can't see neighbors
-        1 => { 186 } // Wall only to the north
+        1 => 186,  // Wall only to the north
-        2 => { 186 } // Wall only to the south
+        2 => 186,  // Wall only to the south
-        3 => { 186 } // Wall to the north and south
+        3 => 186,  // Wall to the north and south
-        4 => { 205 } // Wall only to the west
+        4 => 205,  // Wall only to the west
-        5 => { 188 } // Wall to the north and west
+        5 => 188,  // Wall to the north and west
-        6 => { 187 } // Wall to the south and west
+        6 => 187,  // Wall to the south and west
-        7 => { 185 } // Wall to the north, south and west
+        7 => 185,  // Wall to the north, south and west
-        8 => { 205 } // Wall only to the east
+        8 => 205,  // Wall only to the east
-        9 => { 200 } // Wall to the north and east
+        9 => 200,  // Wall to the north and east
-        10 => { 201 } // Wall to the south and east
+        10 => 201, // Wall to the south and east
-        11 => { 204 } // Wall to the north, south and east
+        11 => 204, // Wall to the north, south and east
-        12 => { 205 } // Wall to the east and west
+        12 => 205, // Wall to the east and west
-        13 => { 202 } // Wall to the east, west, and south
+        13 => 202, // Wall to the east, west, and south
-        14 => { 203 } // Wall to the east, west, and north
+        14 => 203, // Wall to the east, west, and north
-        15 => { 206 }  // ╬ Wall on all sides
+        15 => 206, // ╬ Wall on all sides
-        _ => { 35 } // We missed one?
+        _ => 35,   // We missed one?
     }
 }
 

src/melee_combat_system.rs

@@ -2,11 +2,13 @@ use specs::prelude::*;
 
 use crate::components::{CombatStats, Name, SufferDamage, WantsToMelee};
 use crate::gamelog::GameLog;
-use crate::{DefenseBonus, Equipped, MeleePowerBonus};
+use crate::particle_system::ParticleBuilder;
+use crate::{DefenseBonus, Equipped, MeleePowerBonus, Position};
 
 pub struct MeleeCombatSystem {}
 
 impl<'a> System<'a> for MeleeCombatSystem {
+    #[allow(clippy::complexity)]
     type SystemData = (
         Entities<'a>,
         WriteExpect<'a, GameLog>,
@@ -17,6 +19,8 @@ impl<'a> System<'a> for MeleeCombatSystem {
         ReadStorage<'a, MeleePowerBonus>,
         ReadStorage<'a, DefenseBonus>,
         ReadStorage<'a, Equipped>,
+        WriteExpect<'a, ParticleBuilder>,
+        ReadStorage<'a, Position>,
     );
 
     fn run(&mut self, data: Self::SystemData) {
@@ -30,6 +34,8 @@ impl<'a> System<'a> for MeleeCombatSystem {
             melee_bonus,
             defense_bonus,
             equipped,
+            mut particle_builder,
+            positions,
         ) = data;
 
         for (entity, wants_melee, name, stats) in
@@ -58,6 +64,17 @@ impl<'a> System<'a> for MeleeCombatSystem {
                         }
                     }
 
+                    if let Some(pos) = positions.get(wants_melee.target) {
+                        particle_builder.request(
+                            pos.x,
+                            pos.y,
+                            rltk::RGB::named(rltk::ORANGE),
+                            rltk::RGB::named(rltk::BLACK),
+                            rltk::to_cp437('‼'),
+                            200.0,
+                        );
+                    }
+
                     let damage = i32::max(
                         0,
                         (stats.power + offensive_bonus) - (target_stats.defense + defensive_bonus),

src/monster_ai_system.rs

@@ -3,9 +3,10 @@ use specs::prelude::*;
 
 use crate::{
     components::{Monster, Position, Viewshed, WantsToMelee},
-    map::Map,
+    Confusion,
-    Confusion, RunState,
+    map::Map, RunState,
 };
+use crate::particle_system::ParticleBuilder;
 
 pub struct MonsterAI {}
 
@@ -22,6 +23,7 @@ impl<'a> System<'a> for MonsterAI {
         WriteStorage<'a, Position>,
         WriteStorage<'a, WantsToMelee>,
         WriteStorage<'a, Confusion>,
+        WriteExpect<'a, ParticleBuilder>
     );
 
     fn run(&mut self, data: Self::SystemData) {
@@ -36,6 +38,7 @@ impl<'a> System<'a> for MonsterAI {
             mut position,
             mut wants_to_melee,
             mut confused,
+            mut particle_builder
         ) = data;
 
         if *runstate != RunState::MonsterTurn {
@@ -43,7 +46,7 @@ impl<'a> System<'a> for MonsterAI {
         }
 
         for (entity, mut viewshed, _monster, mut pos) in
-            (&entities, &mut viewshed, &monster, &mut position).join()
+        (&entities, &mut viewshed, &monster, &mut position).join()
         {
             let mut can_act = true;
 
@@ -53,6 +56,8 @@ impl<'a> System<'a> for MonsterAI {
                     confused.remove(entity);
                 }
                 can_act = false;
+
+                particle_builder.request(pos.x, pos.y, rltk::RGB::named(rltk::MAGENTA), rltk::RGB::named(rltk::BLACK), rltk::to_cp437('?'), 200.);
             }
 
             if !can_act {

src/particle_system.rs

@@ -0,0 +1,119 @@
+use rltk::{Rltk, RGB};
+use specs::prelude::*;
+
+use crate::{ParticleLifetime, Position, Renderable};
+
+pub fn cull_dead_particles(ecs: &mut World, ctx: &Rltk) {
+    let mut dead_particles: Vec<Entity> = Vec::new();
+    {
+        let mut particles = ecs.write_storage::<ParticleLifetime>();
+        let mut entities = ecs.entities();
+        for (entity, mut particle) in (&entities, &mut particles).join() {
+            particle.lifetime_ms -= ctx.frame_time_ms;
+            if particle.lifetime_ms < 0. {
+                dead_particles.push(entity);
+            }
+        }
+    }
+
+    for dead_particle in dead_particles.iter() {
+        ecs.delete_entity(*dead_particle)
+            .expect("Particle will not die");
+    }
+}
+
+struct ParticleRequest {
+    x: i32,
+    y: i32,
+    fg: RGB,
+    bg: RGB,
+    glyph: rltk::FontCharType,
+    lifetime: f32,
+}
+
+pub struct ParticleBuilder {
+    requests: Vec<ParticleRequest>,
+}
+
+impl ParticleBuilder {
+    pub fn new() -> ParticleBuilder {
+        ParticleBuilder {
+            requests: Vec::new(),
+        }
+    }
+
+    pub fn request(
+        &mut self,
+        x: i32,
+        y: i32,
+        fg: RGB,
+        bg: RGB,
+        glyph: rltk::FontCharType,
+        lifetime: f32,
+    ) {
+        self.requests.push(ParticleRequest {
+            x,
+            y,
+            fg,
+            bg,
+            glyph,
+            lifetime,
+        });
+    }
+}
+
+pub struct ParticleSpawnSystem {}
+
+impl<'a> System<'a> for ParticleSpawnSystem {
+    type SystemData = (
+        Entities<'a>,
+        WriteStorage<'a, Position>,
+        WriteStorage<'a, Renderable>,
+        WriteStorage<'a, ParticleLifetime>,
+        WriteExpect<'a, ParticleBuilder>,
+    );
+
+    fn run(&mut self, data: Self::SystemData) {
+        let (
+            entities,
+            mut positions,
+            mut renderables,
+            mut particle_lifetimes,
+            mut particle_builder,
+        ) = data;
+
+        for new_particle in particle_builder.requests.iter() {
+            let p = entities.create();
+            positions
+                .insert(
+                    p,
+                    Position {
+                        x: new_particle.x,
+                        y: new_particle.y,
+                    },
+                )
+                .expect("Unable to insert position");
+            renderables
+                .insert(
+                    p,
+                    Renderable {
+                        fg: new_particle.fg,
+                        bg: new_particle.bg,
+                        glyph: new_particle.glyph,
+                        render_order: 0,
+                    },
+                )
+                .expect("Unable to insert renderable");
+            particle_lifetimes
+                .insert(
+                    p,
+                    ParticleLifetime {
+                        lifetime_ms: new_particle.lifetime,
+                    },
+                )
+                .expect("Unable to insert particle lifetime");
+        }
+
+        particle_builder.requests.clear();
+    }
+}

src/save_load_system.rs

@@ -76,7 +76,8 @@ pub fn save_game(ecs: &mut World) {
             Equipped,
             MeleePowerBonus,
             DefenseBonus,
-            WantsToRemoveItem
+            WantsToRemoveItem,
+            ParticleLifetime
         );
     }
 
@@ -155,7 +156,8 @@ pub fn load_game(ecs: &mut World) {
             Equipped,
             MeleePowerBonus,
             DefenseBonus,
-            WantsToRemoveItem
+            WantsToRemoveItem,
+            ParticleLifetime
         );
     }
 

src/spawner.rs

@@ -9,7 +9,7 @@ use crate::rect::Rect;
 use crate::{
     AreaOfEffect, BlocksTile, CombatStats, Confusion, Consumable, DefenseBonus, EquipmentSlot,
     Equippable, InflictsDamage, Item, MeleePowerBonus, Monster, Name, Player, Position,
-    ProvidesHealing, Ranged, Renderable, SerializeMe, Viewshed, MAP_WIDTH,  MAX_MONSTER,
+    ProvidesHealing, Ranged, Renderable, SerializeMe, Viewshed, MAP_WIDTH, MAX_MONSTER,
 };
 
 pub fn player(ecs: &mut World, player_x: i32, player_y: i32) -> Entity {
@@ -249,7 +249,6 @@ fn dagger(ecs: &mut World, x: i32, y: i32) {
         .build();
 }
 
-
 fn longsword(ecs: &mut World, x: i32, y: i32) {
     ecs.create_entity()
         .with(Position { x, y })
@@ -292,7 +291,6 @@ fn shield(ecs: &mut World, x: i32, y: i32) {
         .build();
 }
 
-
 fn tower_shield(ecs: &mut World, x: i32, y: i32) {
     ecs.create_entity()
         .with(Position { x, y })