Fog of War can be disabled in dev builds

Cargo.lock

@@ -155,9 +155,9 @@ checksum = "1e186cfbae8084e513daff4240b4797e342f988cecda4fb6c939150f96315fd8"
 
 [[package]]
 name = "itertools"
-version = "0.11.0"
+version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b1c173a5686ce8bfa551b3563d0c2170bf24ca44da99c7ca4bfdab5418c3fe57"
+checksum = "25db6b064527c5d482d0423354fcd07a89a2dfe07b67892e62411946db7f07b0"
 dependencies = [
  "either",
 ]
@@ -315,9 +315,9 @@ dependencies = [
 
 [[package]]
 name = "ratatui"
-version = "0.24.0"
+version = "0.25.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0ebc917cfb527a566c37ecb94c7e3fd098353516fb4eb6bea17015ade0182425"
+checksum = "a5659e52e4ba6e07b2dad9f1158f578ef84a73762625ddb51536019f34d180eb"
 dependencies = [
  "bitflags 2.4.1",
  "cassowary",
@@ -326,6 +326,7 @@ dependencies = [
  "itertools",
  "lru",
  "paste",
+ "stability",
  "strum",
  "unicode-segmentation",
  "unicode-width",
@@ -388,6 +389,16 @@ version = "1.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "942b4a808e05215192e39f4ab80813e599068285906cc91aa64f923db842bd5a"
 
+[[package]]
+name = "stability"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ebd1b177894da2a2d9120208c3386066af06a488255caabc5de8ddca22dbc3ce"
+dependencies = [
+ "quote",
+ "syn 1.0.109",
+]
+
 [[package]]
 name = "strum"
 version = "0.25.0"
@@ -407,7 +418,18 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rustversion",
- "syn",
+ "syn 2.0.38",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.109"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
 ]
 
 [[package]]
@@ -472,7 +494,7 @@ dependencies = [
  "once_cell",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.38",
  "wasm-bindgen-shared",
 ]
 
@@ -494,7 +516,7 @@ checksum = "f0eb82fcb7930ae6219a7ecfd55b217f5f0893484b7a13022ebb2b2bf20b5283"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.38",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
@@ -630,5 +652,5 @@ checksum = "56feebc4664bdb37f39c0b1b8fc8fa2f5648e3ec5f9cf4344978b4b7ca561fff"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.38",
 ]

Cargo.toml

@@ -6,7 +6,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-ratatui = "0.24.0"
+ratatui = "0.25.0"
 crossterm = "0.27.0"
 rand = "0.8.5"
 petgraph = "0.6.4"

build.rs

@@ -0,0 +1,7 @@
+use std::process::Command;
+
+fn main() {
+    let output = Command::new("git").args(&["rev-parse", "--short",  "HEAD"]).output().unwrap();
+    let git_hash = String::from_utf8(output.stdout).unwrap();
+    println!("cargo:rustc-env=GIT_HASH={}", git_hash);
+}

src/artifacts.rs

@@ -9,7 +9,7 @@ pub trait Artifact {
     /// get the position of the artifact in the level
     fn get_immutable_position(&self) -> &Position;
     /// call to apply the effects of the artifact to the player
-    fn collect(&mut self, player: &mut Player);
+    fn collect(&mut self, player: &mut Player, messages: &mut Vec<String>);
     /// returns if the artifact was collected and can be removed from the level
     fn was_collected(&self) -> bool;
 }
@@ -37,8 +37,9 @@ impl Artifact for Chest {
     }
 
     fn get_immutable_position(&self) -> &Position { &self.position }
-    fn collect(&mut self, player: &mut Player) {
+    fn collect(&mut self, player: &mut Player, messages: &mut Vec<String>) {
         player.retrieve_gold(self.gold);
+        messages.insert(0, format!("opened chest and collected {} gold.", self.gold).to_string());
         self.gold = 0;
     }
 
@@ -67,9 +68,17 @@ impl Artifact for Potion {
         ("P", Color::Green)
     }
     fn get_immutable_position(&self) -> &Position { &self.position }
-    fn collect(&mut self, player: &mut Player) {
+    fn collect(&mut self, player: &mut Player, messages: &mut Vec<String>) {
-        player.change_life(self.health.try_into().unwrap());
+        // only consume potion of the player can gain at least one health point
-        self.health = 0;
+        if !player.is_healthy() {
+            let old = player.get_life();
+            player.increase_life(self.health.try_into().unwrap());
+            let new = player.get_life();
+            messages.insert(0, format!("picked up potion and gained {} hp.", new - old).to_string());
+            self.health = 0;
+        } else {
+            messages.insert(0, "not using the potion because you're healthy.".to_string());
+        }
     }
 
     fn was_collected(&self) -> bool {

src/dungeon_slayer.rs

@@ -0,0 +1,150 @@
+use rand::Rng;
+
+
+pub fn do_challenge(stat: u8) -> (bool, u8) {
+    if stat <= 20 {
+        let mut rng = rand::thread_rng();
+        let dice_roll = rng.gen_range(1..21);
+        return match dice_roll {
+            20 => { (false, 0) }
+            1 => { (true, dice_roll) }
+            _ => {
+                if dice_roll <= stat {
+                    (true, stat - dice_roll)
+                } else {
+                    (false, 0)
+                }
+            }
+        };
+    }
+    (false, 0)
+}
+
+#[allow(dead_code)]
+pub struct PlayerStats {
+    // dungeon slayer attributes
+    pub(crate) body: u8,
+    pub(crate) agility: u8,
+    pub(crate) mind: u8,
+
+    // dungeon slayer properties
+    //  for body
+    pub(crate) strength: u8,
+    pub(crate) toughness: u8,
+    //  for agility
+    pub(crate) movement: u8,
+    pub(crate) dexterity: u8,
+    // for mind
+    pub(crate) wisdom: u8,
+    // TODO maybe the wrong translation of Verstand
+    pub(crate) aura: u8,
+}
+
+impl PlayerStats {
+    /// create random values for the 3 attributes of the dungeon slayer character
+    /// Each attribute is between 4 and 8, not over 20 in sum.
+    fn create_random_attributes() -> (u8, u8, u8) {
+        let mut values: [u8; 3] = [8, 8, 8];
+        let mut rng = rand::thread_rng();
+        while values[0] + values[1] + values[2] > 20 {
+            let i = rng.gen_range(0..3);
+            values[i] = values[i].saturating_sub(1);
+        }
+        (values[0], values[1], values[2])
+    }
+
+    /// create random values for the 6 properties of the dungeon slayer character
+    /// Each property is between 0 and 4, not over 8 in sum.
+    fn create_random_properties() -> (u8, u8, u8, u8, u8, u8) {
+        let mut values: [u8; 6] = [4, 4, 4, 4, 4, 4];
+        let mut rng = rand::thread_rng();
+        while values[0] + values[1] + values[2] + values[3] + values[4] + values[5] > 8 {
+            let i = rng.gen_range(0..6);
+            values[i] = values[i].saturating_sub(1);
+        }
+        (values[0], values[1], values[2], values[3], values[4], values[5])
+    }
+
+    /// create a set of player stats containing attributes and properties according to the
+    /// dungeon slayer rules.
+    pub fn create_random() -> PlayerStats {
+        let attributes = PlayerStats::create_random_attributes();
+        let properties = PlayerStats::create_random_properties();
+        PlayerStats {
+            body: attributes.0,
+            agility: attributes.1,
+            mind: attributes.2,
+            strength: properties.0,
+            toughness: properties.1,
+            movement: properties.2,
+            dexterity: properties.3,
+            wisdom: properties.4,
+            aura: properties.5,
+        }
+    }
+
+    /// calculate the max life based on this player stats.
+    pub fn get_max_life(&self) -> u8 {
+        self.body + self.toughness + 10
+    }
+    pub fn get_defense(&self) -> u8 {
+        self.body + self.toughness // TODO + self.armor
+    }
+    pub fn get_hit(&self) -> u8 {
+        self.body + self.strength // TODO + self.weapon
+    }
+}
+
+#[allow(dead_code)]
+pub struct MonsterStats {
+    // dungeon slayer attributes
+    pub(crate) body: u8,
+    pub(crate) agility: u8,
+    pub(crate) mind: u8,
+
+    // dungeon slayer properties
+    //  for body
+    pub(crate) strength: u8,
+    pub(crate) toughness: u8,
+    //  for agility
+    pub(crate) movement: u8,
+    pub(crate) dexterity: u8,
+    // for mind
+    pub(crate) wisdom: u8,
+    // TODO maybe the wrong translation of Verstand
+    pub(crate) aura: u8,
+
+    pub(crate) max_life: u8,
+    pub(crate) defense: u8,
+    pub(crate) initiative: u8,
+    pub(crate) walk: u8,
+    pub(crate) hit: u8,
+    pub(crate) shoot: u8,
+    pub(crate) cast: u8,
+    pub(crate) targeted_cast: u8,
+}
+
+#[test]
+fn test_create_random_attributes() {
+    for _ in 0..1000 {
+        let attributes = PlayerStats::create_random_attributes();
+        assert!(attributes.0 <= 8);
+        assert!(attributes.1 <= 8);
+        assert!(attributes.2 <= 8);
+        assert_eq!(attributes.0 + attributes.1 + attributes.2, 20);
+    }
+}
+
+#[test]
+fn test_create_random_properties() {
+    for _ in 0..1000 {
+        let properties = PlayerStats::create_random_properties();
+        assert!(properties.0 <= 4);
+        assert!(properties.1 <= 4);
+        assert!(properties.2 <= 4);
+        assert!(properties.3 <= 4);
+        assert!(properties.4 <= 4);
+        assert!(properties.5 <= 4);
+        assert_eq!(properties.0 + properties.1 + properties.2 + properties.3 + properties.4 + properties.5, 8);
+    }
+}

src/game.rs

@@ -1,3 +1,6 @@
+use crate::dungeon_slayer::do_challenge;
+#[cfg(test)]
+use crate::dungeon_slayer::PlayerStats;
 use crate::level::{Level, StructureElement};
 use crate::level_generator::LevelGenerator;
 use crate::player::Player;
@@ -23,6 +26,8 @@ pub struct Game {
     player: Player,
     /// the levels of the game
     levels: Vec<Level>,
+    pub messages: Vec<String>,
+    use_fog_of_war: bool,
 }
 
 impl Game {
@@ -34,6 +39,8 @@ impl Game {
         let mut g = Game {
             player: p,
             levels: v,
+            messages: Vec::with_capacity(10),
+            use_fog_of_war: true,
         };
         let start = {
             g.get_level(0).start
@@ -69,6 +76,8 @@ impl Game {
     pub fn get_player(&self) -> &Player {
         &self.player
     }
+    pub fn toggle_fog_of_war(&mut self) { self.use_fog_of_war = !self.use_fog_of_war; }
+    pub fn uses_fog_of_war(&self) -> bool { self.use_fog_of_war }
     pub fn get_mutable_player(&mut self) -> &mut Player {
         &mut self.player
     }
@@ -100,7 +109,7 @@ impl Game {
         let new_y: i16 = player_pos.get_y() as i16 + dy;
         let player_level = player_pos.get_level();
         let level = &mut self.levels[player_level];
-        level.get_element(new_x, new_y).0
+        level.get_element(new_x, new_y, self.use_fog_of_war).0
     }
 
     /// move the game's player into the given direction. If on the target field there is a stair,
@@ -125,12 +134,14 @@ impl Game {
                         (dx, dy) = (0, 0);
                         let (next_level, x, y) = self.next_start();
                         player_level = next_level;
+                        self.messages.insert(0, format!("You climb down to level {}.", next_level));
                         self.get_mutable_player().get_position().set(next_level, x, y);
                     }
                     StructureElement::StairUp => {
                         (dx, dy) = (0, 0);
                         let (next_level, x, y) = self.prev_end();
                         player_level = next_level;
+                        self.messages.insert(0, format!("You climb up to level {}.", next_level));
                         self.get_mutable_player().get_position().set(next_level, x, y);
                     }
                     _ => {}
@@ -148,16 +159,27 @@ impl Game {
         let player_pos = &self.player.get_immutable_position();
         let player_level = player_pos.get_level();
         let level = &mut self.levels[player_level];
-        let (_, m, _) = level.get_element(player_pos.get_x() as i16, player_pos.get_y() as i16);
+        let (_, m, _) = level.get_element(player_pos.get_x() as i16, player_pos.get_y() as i16, true);
         match m {
             None => {}
             Some(m) => {
-                // TODO fight the monster
+                // Player attacks monster
-                self.player.change_life(-1);
+                let attack = do_challenge(self.player.player_stats.get_hit());
-                m.decrease_life(1);
+                if attack.0 {
+                    let mut damage = attack.1;
+                    let defense = do_challenge(m.get_defense());
+                    if defense.0 {
+                        damage = damage.saturating_sub(defense.1);
+                    }
+                    self.messages.insert(0, format!("Attack on {} successful with {} damage.", m.get_name(), damage).to_string());
+                    m.decrease_life(damage as usize);
+                } else {
+                    self.messages.insert(0, format!("Attack on {} failed.", m.get_name()).to_string());
+                }
                 // monster died, player gains experience
                 if m.is_dead() {
                     self.player.gain_experience(m.get_experience_gain());
+                    self.messages.insert(0, format!("You killed the {}.", m.get_name()).to_string());
                 }
                 return m.is_dead();
             }
@@ -168,11 +190,11 @@ impl Game {
         let player_pos = &self.player.get_immutable_position();
         let player_level = player_pos.get_level();
         let level = &mut self.levels[player_level];
-        let (_, _, a) = level.get_element(player_pos.get_x() as i16, player_pos.get_y() as i16);
+        let (_, _, a) = level.get_element(player_pos.get_x() as i16, player_pos.get_y() as i16, true);
         match a {
             None => {}
             Some(a) => {
-                a.collect(&mut self.player);
+                a.collect(&mut self.player, &mut self.messages);
             }
         }
     }
@@ -181,20 +203,42 @@ impl Game {
         let player_pos = &self.player.get_immutable_position();
         let player_level = player_pos.get_level();
         let level = &mut self.levels[player_level];
-        level.update(ticks, &mut self.player);
+        level.update(ticks, &mut self.player, &mut self.messages);
     }
 }
 
 #[test]
 fn game_has_correct_number_of_levels() {
-    let p = Player::new("foo", 42);
+    let player_stats = PlayerStats {
+        body: 8,
+        agility: 8,
+        mind: 4,
+        strength: 3,
+        toughness: 3,
+        movement: 1,
+        dexterity: 1,
+        wisdom: 0,
+        aura: 0,
+    };
+    let p = Player::new("foo", player_stats);
     let g = Game::new(p);
     assert_eq!(g.levels.len(), LEVELS);
 }
 
 #[test]
 fn game_has_player() {
-    let p = Player::new("foo", 42);
+    let player_stats = PlayerStats {
+        body: 8,
+        agility: 8,
+        mind: 4,
+        strength: 3,
+        toughness: 3,
+        movement: 1,
+        dexterity: 1,
+        wisdom: 0,
+        aura: 0,
+    };
+    let p = Player::new("foo", player_stats);
     let g = Game::new(p);
     assert_eq!(g.get_player().get_name(), "foo");
     assert_eq!(g.get_player().get_immutable_position().get_level(), 0);
@@ -202,16 +246,38 @@ fn game_has_player() {
 
 #[test]
 fn game_has_mutable_player() {
-    let p = Player::new("foo", 42);
+    let player_stats = PlayerStats {
+        body: 8,
+        agility: 8,
+        mind: 4,
+        strength: 3,
+        toughness: 3,
+        movement: 1,
+        dexterity: 1,
+        wisdom: 0,
+        aura: 0,
+    };
+    let p = Player::new("foo", player_stats);
     let mut g = Game::new(p);
     assert_eq!(g.get_player().get_name(), "foo");
-    g.get_mutable_player().change_life(-1);
+    g.get_mutable_player().decrease_life(1);
-    assert_eq!(g.get_player().get_life(), 41);
+    assert_eq!(g.get_player().get_life(), 20);
 }
 
 #[test]
 fn game_get_level() {
-    let p = Player::new("foo", 42);
+    let player_stats = PlayerStats {
+        body: 8,
+        agility: 8,
+        mind: 4,
+        strength: 3,
+        toughness: 3,
+        movement: 1,
+        dexterity: 1,
+        wisdom: 0,
+        aura: 0,
+    };
+    let p = Player::new("foo", player_stats);
     let mut g = Game::new(p);
     g.get_level(0);
     assert_ne!(g.get_level(0).start, (0, 0));

src/level.rs

@@ -1,11 +1,9 @@
 use std::cmp::{max, min};
 
-use rand::Rng;
-use rand::rngs::ThreadRng;
-
 #[cfg(test)]
 use crate::artifacts::{Chest, Potion};
 use crate::artifacts::Artifact;
+use crate::dungeon_slayer::do_challenge;
 #[cfg(test)]
 use crate::monster::{Orc, Rat};
 use crate::monster::Monster;
@@ -37,11 +35,10 @@ pub struct Level {
     pub(crate) start: (usize, usize),
     /// the position of the end in the level (either stair down or end point)
     pub(crate) end: (usize, usize),
-    pub(crate) rng: ThreadRng,
 }
 
 impl Level {
-    pub fn get_element(&mut self, x: i16, y: i16) -> (Option<StructureElement>, Option<&mut Box<(dyn Monster + 'static)>>, Option<&mut Box<(dyn Artifact + 'static)>>) {
+    pub fn get_element(&mut self, x: i16, y: i16, use_fog_of_war: bool) -> (Option<StructureElement>, Option<&mut Box<(dyn Monster + 'static)>>, Option<&mut Box<(dyn Artifact + 'static)>>) {
         if x < 0 || y < 0 {
             return (None, None, None);
         }
@@ -50,7 +47,7 @@ impl Level {
         if x >= LEVEL_WIDTH || y >= LEVEL_HEIGHT {
             return (None, None, None);
         }
-        if !self.discovered[x][y] {
+        if use_fog_of_war && !self.discovered[x][y] {
             return (Some(StructureElement::Unknown), None, None);
         }
         let search_pos = &Position::new(self.level, x, y);
@@ -112,7 +109,7 @@ impl Level {
             }
         }
     }
-    pub fn update(&mut self, ticks: u128, player: &mut Player) {
+    pub fn update(&mut self, ticks: u128, player: &mut Player, messages: &mut Vec<String>) {
         for (index, a) in &mut self.artifacts.iter().enumerate() {
             if a.was_collected() {
                 self.artifacts.remove(index);
@@ -128,19 +125,27 @@ impl Level {
             }
             loop {
                 // calculate the direction the monster will try to walk
-                let (dx, dy) = match self.rng.gen_range(0..5) {
+                let (dx, dy) = self.monsters[index].get_next_move(&self, player.get_immutable_position());
-                    1 => { (1, 0) }
-                    2 => { (-1, 0) }
-                    3 => { (0, 1) }
-                    4 => { (0, -1) }
-                    _ => { (0, 0) }
-                };
                 if self.can_monster_move(self.monsters[index].as_ref(), dx, dy) {
                     let (new_x, new_y) = self.monsters[index].get_position().change(dx, dy);
                     if player.get_immutable_position().get_x() == new_x && player.get_immutable_position().get_y() == new_y {
-                        self.monsters[index].decrease_life(1);
+                        // TODO monster attacks
-                        player.change_life(-1);
+                        let attack = do_challenge(self.monsters[index].get_hit());
-                        // if the attack did not kill the opponent, back down
+                        if attack.0 {
+                            let mut damage = attack.1;
+                            let defense = do_challenge(player.player_stats.get_defense());
+                            if defense.0 {
+                                damage = damage.saturating_sub(defense.1);
+                            }
+                            player.decrease_life(damage);
+                            if player.is_dead() {
+                                messages.insert(0, format!("Attack from {} killed you.", self.monsters[index].get_name()).to_string());
+                            } else {
+                                messages.insert(0, format!("Attack from {} successful with {} damage.", self.monsters[index].get_name(), damage).to_string());
+                            }
+                        } else {
+                            messages.insert(0, format!("Attack from {} failed.", self.monsters[index].get_name()).to_string());
+                        }
                         if !player.is_dead() {
                             self.monsters[index].get_position().change(-dx, -dy);
                         }
@@ -162,6 +167,7 @@ impl Level {
         let new_x: usize = (agent_pos.get_x() as i16 + dx) as usize;
         let new_y: usize = (agent_pos.get_y() as i16 + dy) as usize;
 
+        // verify we cannot leave the playing field
         if new_x >= LEVEL_WIDTH || new_y >= LEVEL_HEIGHT {
             return false;
         }
@@ -176,6 +182,12 @@ impl Level {
         let agent_pos = agent.get_immutable_position();
         let new_x: usize = (agent_pos.get_x() as i16 + dx) as usize;
         let new_y: usize = (agent_pos.get_y() as i16 + dy) as usize;
+
+        // verify we cannot leave the playing field
+        if new_x >= LEVEL_WIDTH || new_y >= LEVEL_HEIGHT {
+            return false;
+        }
+
         self.structure[new_x][new_y] != StructureElement::Wall
     }
     #[cfg(test)]
@@ -194,7 +206,6 @@ impl Level {
             artifacts: Vec::with_capacity(10),
             start: (0, 0),
             end: (0, 0),
-            rng: rand::thread_rng(),
         }
     }
     #[cfg(test)]
@@ -228,23 +239,23 @@ impl Level {
 #[test]
 fn test_get_element() {
     let mut l = Level::new(0);
-    assert_eq!(l.get_element(-1, -1).0, None);
+    assert_eq!(l.get_element(-1, -1, true).0, None);
-    assert_eq!(l.get_element(0, 0).0.unwrap(), StructureElement::Unknown);
+    assert_eq!(l.get_element(0, 0, true).0.unwrap(), StructureElement::Unknown);
-    assert_eq!(l.get_element(LEVEL_WIDTH as i16 - 1, LEVEL_HEIGHT as i16 - 1).0.unwrap(), StructureElement::Unknown);
+    assert_eq!(l.get_element(LEVEL_WIDTH as i16 - 1, LEVEL_HEIGHT as i16 - 1, true).0.unwrap(), StructureElement::Unknown);
-    assert_eq!(l.get_element(LEVEL_WIDTH as i16, LEVEL_HEIGHT as i16).0, None);
+    assert_eq!(l.get_element(LEVEL_WIDTH as i16, LEVEL_HEIGHT as i16, true).0, None);
 }
 
 #[test]
 fn test_discover_get_element() {
     let mut l = Level::new(0);
-    assert_eq!(l.get_element(10, 10).0.unwrap(), StructureElement::Unknown);
+    assert_eq!(l.get_element(10, 10, true).0.unwrap(), StructureElement::Unknown);
     let p = Position::new(0, 10, 10);
     l.discover(&p);
-    assert_eq!(l.get_element(10, 10).0.unwrap(), StructureElement::Floor);
+    assert_eq!(l.get_element(10, 10, true).0.unwrap(), StructureElement::Floor);
-    assert_eq!(l.get_element(9, 10).0.unwrap(), StructureElement::Floor);
+    assert_eq!(l.get_element(9, 10, true).0.unwrap(), StructureElement::Floor);
-    assert_eq!(l.get_element(10, 9).0.unwrap(), StructureElement::Floor);
+    assert_eq!(l.get_element(10, 9, true).0.unwrap(), StructureElement::Floor);
-    assert_eq!(l.get_element(11, 10).0.unwrap(), StructureElement::Floor);
+    assert_eq!(l.get_element(11, 10, true).0.unwrap(), StructureElement::Floor);
-    assert_eq!(l.get_element(10, 11).0.unwrap(), StructureElement::Floor);
+    assert_eq!(l.get_element(10, 11, true).0.unwrap(), StructureElement::Floor);
 }
 
 #[test]
@@ -285,20 +296,20 @@ fn test_discover_get_monster() {
     let mut l = Level::new(0);
     let p = Position::new(0, 10, 10);
     l.discover(&p);
-    assert_eq!(l.get_element(10, 10).0.unwrap(), StructureElement::Floor);
+    assert_eq!(l.get_element(10, 10, true).0.unwrap(), StructureElement::Floor);
-    assert!(l.get_element(10, 10).1.is_none());
+    assert!(l.get_element(10, 10, true).1.is_none());
 
     let m = Rat::new_with_position(Position::new(0, 10, 10));
     assert_eq!(l.add_monster(m), Ok(()));
 
-    let elem = l.get_element(10, 10);
+    let elem = l.get_element(10, 10, true);
     assert_eq!(elem.0.unwrap(), StructureElement::Floor);
     assert!(elem.1.is_some());
     let m = elem.1.unwrap();
-    assert_eq!(m.get_life(), 2);
+    assert_eq!(m.get_life(), 3);
 
-    m.decrease_life(2);
+    m.decrease_life(3);
-    assert_eq!(l.get_element(10, 10).1.unwrap().get_life(), 0);
+    assert_eq!(l.get_element(10, 10, true).1.unwrap().get_life(), 0);
 }
 
 #[test]
@@ -306,13 +317,13 @@ fn test_discover_get_artifact() {
     let mut l = Level::new(0);
     let p = Position::new(0, 10, 10);
     l.discover(&p);
-    assert_eq!(l.get_element(10, 10).0.unwrap(), StructureElement::Floor);
+    assert_eq!(l.get_element(10, 10, true).0.unwrap(), StructureElement::Floor);
-    assert!(l.get_element(10, 10).2.is_none());
+    assert!(l.get_element(10, 10, true).2.is_none());
 
     let a = Chest::new(Position::new(0, 10, 10));
     assert_eq!(l.add_artifact(a), Ok(()));
 
-    let elem = l.get_element(10, 10);
+    let elem = l.get_element(10, 10, true);
     assert_eq!(elem.0.unwrap(), StructureElement::Floor);
     assert!(elem.2.is_some());
 }
@@ -326,12 +337,12 @@ fn test_discover_get_monster_can_move() {
     let m = Rat::new_with_position(Position::new(0, 10, 10));
     l.add_monster(m).expect("Panic because of");
 
-    let m = l.get_element(10, 10).1.unwrap();
+    let m = l.get_element(10, 10, true).1.unwrap();
     m.get_position().change(1, 1);
 
-    let m = l.get_element(10, 10).1;
+    let m = l.get_element(10, 10, true).1;
     assert!(m.is_none());
-    let m = l.get_element(11, 11).1;
+    let m = l.get_element(11, 11, true).1;
     assert!(m.is_some());
-    assert_eq!(m.unwrap().get_life(), 2);
+    assert_eq!(m.unwrap().get_life(), 3);
 }

src/level_generator.rs

@@ -11,7 +11,7 @@ use rand::rngs::ThreadRng;
 
 use crate::artifacts::{Artifact, Chest, Potion};
 use crate::level::{Level, StructureElement};
-use crate::monster::{Monster, Orc, Rat};
+use crate::monster::{LowerDaemon, Monster, Rat};
 use crate::position::Position;
 
 const ROOMS_VERTICAL: usize = 7;
@@ -276,7 +276,7 @@ impl LevelGenerator {
                     // TODO randomize enemies here
                     match rng.gen_range(1..=100) {
                         1..=50 => {
-                            enemies.push(Box::new(Orc::new_with_position(Position::new(self.level, t_x, t_y))));
+                            enemies.push(Box::new(LowerDaemon::new_with_position(Position::new(self.level, t_x, t_y))));
                         }
                         _ => {
                             enemies.push(Box::new(Rat::new_with_position(Position::new(self.level, t_x, t_y))));
@@ -344,7 +344,6 @@ impl LevelGenerator {
             artifacts,
             start: (start_x, start_y),
             end: (end_x, end_y),
-            rng: rand::thread_rng(),
         }
     }
 }

src/level_widget.rs

@@ -9,9 +9,16 @@ use crate::position::HasPosition;
 
 const FG_BROWN: Color = Color::Rgb(186, 74, 0);
 
-pub struct LevelWidget {}
+pub struct LevelWidget {
+    use_fog_of_war: bool,
+}
 
 impl LevelWidget {
+    pub fn new(use_fog_of_war: bool) -> Self {
+        LevelWidget {
+            use_fog_of_war
+        }
+    }
     fn set_cell(&self, buf: &mut Buffer, x: u16, y: u16, symbol: &str, fg: Color, bg: Color) {
         buf.
             get_mut(x, y).
@@ -39,7 +46,7 @@ impl StatefulWidget for LevelWidget {
                     let level = state.get_mutable_level(player_level);
                     let level_x = (x - al) as i16;
                     let level_y = (y - at) as i16;
-                    match level.get_element(level_x, level_y) {
+                    match level.get_element(level_x, level_y, self.use_fog_of_war) {
                         (Some(structure_element), None, None) => {
                             match structure_element {
                                 StructureElement::Start => {

src/main.rs

@@ -8,7 +8,7 @@ use crossterm::{
     terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
 };
 use ratatui::{
-    prelude::{CrosstermBackend, Stylize, Terminal},
+    prelude::{CrosstermBackend, Terminal},
     widgets::Paragraph,
 };
 use ratatui::prelude::*;
@@ -16,9 +16,9 @@ use ratatui::widgets::{Block, Borders, BorderType, Wrap};
 use ratatui::widgets::block::{Position, Title};
 use whoami::realname;
 
+use crate::dungeon_slayer::PlayerStats;
 use crate::game::{Game, GameState};
 use crate::level_widget::LevelWidget;
-// use crate::level_widget::LevelWidget;
 use crate::player::Player;
 use crate::position::HasPosition;
 
@@ -30,13 +30,15 @@ mod level_widget;
 mod level_generator;
 mod artifacts;
 mod monster;
+mod dungeon_slayer;
 
 /// length of a game frame in ms
 pub const FRAME_LENGTH: u64 = 100;
 
 //
 fn main() -> Result<()> {
-    let mut game = Game::new(Player::new(realname().as_str(), 10));
+    let player_stats = PlayerStats::create_random();
+    let mut game = Game::new(Player::new(realname().as_str(), player_stats));
 
     stdout().execute(EnterAlternateScreen)?;
     enable_raw_mode()?;
@@ -81,29 +83,67 @@ fn main() -> Result<()> {
                 width: level::LEVEL_WIDTH as u16,
                 height: level::LEVEL_HEIGHT as u16,
             };
-            frame.render_stateful_widget(LevelWidget {}, map_area, &mut game);
+            frame.render_stateful_widget(LevelWidget::new(game.uses_fog_of_war()), map_area, &mut game);
 
             let stats_area = Rect {
                 x: area.x + 50,
                 y: area.y,
                 width: 30,
-                height: 25,
+                height: 15,
             };
+            let block = Block::default()
+                .title(
+                    Title::from(
+                        format!(" {} ", game.get_player().get_name()))
+                        .alignment(Alignment::Center)
+                        .position(Position::Top)
+                )
+                .borders(Borders::TOP)
+                .border_style(Style::default().fg(Color::White))
+                .border_type(BorderType::Rounded)
+                .style(Style::default().bg(Color::Blue));
             frame.render_widget(
-                Paragraph::new(format!("{}\nHealth: {}/{}\nExp: {}\nGold: {}\nLevel: {}",
+                Paragraph::new(format!("Health: {}/{}\nExp: {}\nGold: {}\nLevel: {}",
-                                       game.get_player().get_name(),
                                        game.get_player().get_life(),
                                        game.get_player().get_max_life(),
                                        game.get_player().get_experience(),
                                        game.get_player().get_gold(),
                                        game.get_player().get_immutable_position().get_level()))
-                    .white()
+                    .block(block).wrap(Wrap { trim: true }),
-                    .on_blue(),
                 stats_area,
             );
+            let messages_area = Rect {
+                x: area.x + 50,
+                y: area.y + 15,
+                width: 30,
+                height: 10,
+            };
+            // Display the latest messages from the game to the user
+            let block = Block::default()
+                .title(Title::from(" messages ").alignment(Alignment::Center).position(Position::Top))
+                .borders(Borders::TOP)
+                .border_style(Style::default().fg(Color::White))
+                .border_type(BorderType::Rounded)
+                .style(Style::default().bg(Color::Blue));
+
+            let paragraph1 = if game.messages.is_empty() { "".to_string() } else { format!("> {}", game.messages.join("\n> ")) };
+            frame.render_widget(
+                Paragraph::new(paragraph1).block(block).wrap(Wrap { trim: true }),
+                messages_area,
+            );
         })?;
         if event::poll(std::time::Duration::from_millis(FRAME_LENGTH))? {
             if let event::Event::Key(key) = event::read()? {
+                if key.kind == KeyEventKind::Press && key.code == KeyCode::Char('v') {
+                    game.messages.insert(0, format!("You are playing version '{}'.", env!("GIT_HASH")).to_string());
+                }
+                // disabling the d key (disable fog of war) in release builds!
+                #[cfg(debug_assertions)]
+                if key.kind == KeyEventKind::Press && key.code == KeyCode::Char('d') {
+                    game.messages.insert(0, "toggle fog of war!".to_string());
+                    game.toggle_fog_of_war();
+                }
+
                 if key.kind == KeyEventKind::Press && key.code == KeyCode::Char('q') {
                     break;
                 }
@@ -140,7 +180,7 @@ fn main() -> Result<()> {
             area.width = 40;
             area.height = 20;
             let block = Block::default()
-                .title("Game ended")
+                .title(Title::from(" Game ended ").alignment(Alignment::Center).position(Position::Top))
                 .title(Title::from("Press `q` to quit!").position(Position::Bottom))
                 .borders(Borders::ALL)
                 .border_style(Style::default().fg(Color::White))
@@ -151,13 +191,13 @@ fn main() -> Result<()> {
                     "Quitting is for cowards! You'll better try again!".to_string()
                 }
                 GameState::LOST => {
-                    "Sorry, you died in the dungeon. Better luck next time!".to_string()
+                    format!("Sorry, you died in the dungeon. Better luck next time!\nLast message:\n{}", game.messages[0]).to_string()
                 }
                 GameState::WON => {
                     "Congratulation! You mastered your way through the dungeon and won the game.".to_string()
                 }
             };
-            text += format!("\nYou gained {} experience.", game.get_player().get_experience()).as_str();
+            text += format!("\n\nYou gained {} experience.", game.get_player().get_experience()).as_str();
             text += format!("\nYou collected {} gold.", game.get_player().get_gold()).as_str();
             text += format!("\nYou played {} seconds.", playtime.as_secs()).as_str();
             let paragraph = Paragraph::new(text).block(block).wrap(Wrap { trim: true });
@@ -171,7 +211,6 @@ fn main() -> Result<()> {
             }
         }
     }
-
     stdout().execute(LeaveAlternateScreen)?;
     disable_raw_mode()?;
     Ok(())

src/monster.rs

@@ -1,14 +1,22 @@
 use ratatui::prelude::Color;
 
+use crate::dungeon_slayer::MonsterStats;
+use crate::level::Level;
 use crate::position::{HasPosition, Position};
+use rand::Rng;
+
 
 pub trait Monster: HasPosition {
+    fn get_name(&self) -> &str;
     fn is_dead(&self) -> bool;
     fn get_representation(&self) -> (&str, Color);
     fn decrease_life(&mut self, by: usize);
     // fn get_immutable_position(&self) -> &Position;
     fn get_experience_gain(&self) -> usize;
     fn get_ticks_between_steps(&self) -> u128;
+    fn get_defense(&self) -> u8;
+    fn get_hit(&self) -> u8;
+    fn get_next_move(&self, level: &Level, player_pos: &Position) -> (i16, i16);
     #[cfg(test)]
     fn get_life(&self) -> usize;
 }
@@ -16,6 +24,7 @@ pub trait Monster: HasPosition {
 macro_rules! default_monster {
     ($($t:ty),+ $(,)?) => ($(
         impl Monster for $t {
+            fn get_name(&self) -> &str { &self.name }
             fn is_dead(&self) -> bool { self.life <= 0 }
             fn get_experience_gain(&self) -> usize { self.experience_gain }
             fn get_representation(&self) -> (&str, Color) { (&self.symbol, self.color) }
@@ -23,7 +32,11 @@ macro_rules! default_monster {
                 self.life = self.life.saturating_sub(by);
             }
             fn get_ticks_between_steps(&self) -> u128 { self.ticks_between_steps }
-
+            fn get_defense(&self) -> u8 { self.monster_stats.defense }
+            fn get_hit(&self) -> u8 { self.monster_stats.hit }
+            fn get_next_move(&self, level: &Level, player_pos: &Position) -> (i16, i16) {
+                self.calc_move(level, player_pos)
+            }
             #[cfg(test)]
             fn get_life(&self) -> usize { self.life }
         }
@@ -38,47 +51,180 @@ macro_rules! default_monster {
     )+)
 }
 
-pub struct Rat {
+/// Lower Daemon
+///     Page: 107
+///     GH: 1
+pub struct LowerDaemon {
+    name: String,
     life: usize,
     position: Position,
     symbol: String,
     color: Color,
     experience_gain: usize,
     ticks_between_steps: u128,
+    monster_stats: MonsterStats,
+}
+
+impl crate::monster::LowerDaemon {
+    pub fn new_with_position(position: Position) -> Self {
+        let monster_stats = MonsterStats {
+            body: 5,
+            agility: 5,
+            mind: 5,
+            strength: 2,
+            toughness: 2,
+            movement: 2,
+            dexterity: 2,
+            wisdom: 2,
+            aura: 2,
+            max_life: 9,
+            defense: 9,
+            initiative: 7,
+            walk: 3,
+            hit: 8,
+            shoot: 0,
+            cast: 0,
+            targeted_cast: 0,
+        };
+        Self {
+            name: "lower daemon".to_string(),
+            life: monster_stats.max_life as usize,
+            position,
+            symbol: String::from("d"),
+            color: Color::Black,
+            experience_gain: 104,
+            ticks_between_steps: 5,
+            monster_stats,
+        }
+    }
+
+    fn calc_move(&self, _level: &Level, player_pos: &Position) -> (i16, i16) {
+        let d = self.position.distance(player_pos);
+        if d == 1 {
+            return self.position.get_direction(player_pos);
+        }
+        match rand::thread_rng().gen_range(0..5) {
+            1 => { (1, 0) }
+            2 => { (-1, 0) }
+            3 => { (0, 1) }
+            4 => { (0, -1) }
+            _ => { (0, 0) }
+        }
+    }
+}
+default_monster!(LowerDaemon);
+
+/// Rat
+///     Page: 119
+///     GH: 1
+pub struct Rat {
+    name: String,
+    life: usize,
+    position: Position,
+    symbol: String,
+    color: Color,
+    experience_gain: usize,
+    ticks_between_steps: u128,
+    monster_stats: MonsterStats,
 }
 
 impl Rat {
     pub fn new_with_position(position: Position) -> Self {
+        let monster_stats = MonsterStats {
+            body: 2,
+            agility: 4,
+            mind: 1,
+            strength: 1,
+            toughness: 0,
+            movement: 2,
+            dexterity: 0,
+            wisdom: 0,
+            aura: 0,
+            max_life: 3,
+            defense: 2,
+            initiative: 6,
+            walk: 3,
+            hit: 4,
+            shoot: 0,
+            cast: 0,
+            targeted_cast: 0,
+        };
         Self {
-            life: 2,
+            name: "rat".to_string(),
+            life: monster_stats.max_life as usize,
             position,
             symbol: String::from("R"),
             color: Color::Black,
-            experience_gain: 5,
+            experience_gain: 26,
             ticks_between_steps: 5,
+            monster_stats,
+        }
+    }
+    fn calc_move(&self, _level: &Level, _player_pos: &Position) -> (i16, i16) {
+        match rand::thread_rng().gen_range(0..5) {
+            1 => { (1, 0) }
+            2 => { (-1, 0) }
+            3 => { (0, 1) }
+            4 => { (0, -1) }
+            _ => { (0, 0) }
         }
     }
 }
 default_monster!(Rat);
 
+/// Orc
+///     Page: 118
+///     GH: 2
 pub struct Orc {
+    name: String,
     life: usize,
     position: Position,
     symbol: String,
     color: Color,
     experience_gain: usize,
     ticks_between_steps: u128,
+    monster_stats: MonsterStats,
 }
 
 impl Orc {
     pub fn new_with_position(position: Position) -> Self {
+        let monster_stats = MonsterStats {
+            body: 10,
+            agility: 6,
+            mind: 2,
+            strength: 2,
+            toughness: 3,
+            movement: 0,
+            dexterity: 3,
+            wisdom: 1,
+            aura: 0,
+            max_life: 23,
+            defense: 14,
+            initiative: 1,
+            walk: 4,
+            hit: 13,
+            shoot: 10,
+            cast: 0,
+            targeted_cast: 0,
+        };
         Self {
-            life: 4,
+            name: "orc".to_string(),
+            life: monster_stats.max_life as usize,
             position,
             symbol: String::from("O"),
             color: Color::DarkGray,
-            experience_gain: 10,
+            experience_gain: 63,
             ticks_between_steps: 10,
+            monster_stats,
+        }
+    }
+    fn calc_move(&self, _level: &Level, _player_pos: &Position) -> (i16, i16) {
+        match rand::thread_rng().gen_range(0..5) {
+            1 => { (1, 0) }
+            2 => { (-1, 0) }
+            3 => { (0, 1) }
+            4 => { (0, -1) }
+            _ => { (0, 0) }
         }
     }
 }
@@ -88,7 +234,7 @@ default_monster!(Orc);
 
 #[test]
 fn monsters_can_move() {
-    let mut m = Rat::new_with_position(Position::new(0,0,0));
+    let mut m = Rat::new_with_position(Position::new(0, 0, 0));
     assert_eq!(m.get_position(), &Position::new(0, 0, 0));
     m.get_position().change(1, 2);
     assert_eq!(m.get_position(), &Position::new(0, 1, 2));
@@ -101,12 +247,18 @@ fn monsters_can_move() {
 
 #[test]
 fn monsters_can_die() {
-    let mut m = Rat::new_with_position(Position::new(0,0,0));
+    let mut m = Rat::new_with_position(Position::new(0, 0, 0));
-    assert_eq!(m.get_life(), 2);
+    assert_eq!(m.get_life(), 3);
     assert_eq!(m.is_dead(), false);
     m.decrease_life(1);
-    assert_eq!(m.get_life(), 1);
+    assert_eq!(m.get_life(), 2);
-    m.decrease_life(2);
+    m.decrease_life(3);
     assert_eq!(m.get_life(), 0);
     assert_eq!(m.is_dead(), true);
+}
+
+#[test]
+fn test_rat_values() {
+    let m = Rat::new_with_position(Position::new(0, 0, 0));
+    assert_eq!(m.monster_stats.max_life, 3);
 }

src/player.rs

@@ -1,40 +1,46 @@
 use std::cmp::{max, min};
 
+use crate::dungeon_slayer::PlayerStats;
 use crate::position::{HasPosition, Position};
 
 pub struct Player {
     name: String,
     position: Position,
     life: i16,
-    max_life: i16,
     gold: usize,
     experience: usize,
+    pub(crate) player_stats: PlayerStats,
 }
 
 impl Player {
-    pub fn new(name: &str, max_life: i16) -> Player {
+    pub fn new(name: &str, player_stats: PlayerStats) -> Player {
         Player {
             name: name.to_string(),
             position: Position::new(0, 0, 0),
-            life: max_life,
+            life: player_stats.get_max_life() as i16,
-            max_life,
             gold: 0,
             experience: 0,
+            player_stats,
         }
     }
     pub fn get_name(&self) -> String {
         return self.name.clone();
     }
-    pub fn change_life(&mut self, by: i16) {
+    pub fn decrease_life(&mut self, by: u8) {
-        self.life = max(0, min(self.max_life, self.life + by));
+        self.life = max(0, self.life.saturating_sub(by as i16));
+    }
+    pub fn increase_life(&mut self, by: u8) {
+        self.life = min(self.life.saturating_add(by as i16), self.get_max_life());
     }
-    /// returns true if the player is dead (life <= 0)
     pub fn get_life(&self) -> i16 {
         self.life
     }
+    /// returns true if the player is dead (life <= 0)
     pub fn is_dead(&self) -> bool { self.life <= 0 }
+    /// returns true if the player's life is at maximum
+    pub fn is_healthy(&self) -> bool { self.life == self.get_max_life() }
     pub fn get_max_life(&self) -> i16 {
-        self.max_life
+        self.player_stats.get_max_life() as i16
     }
 
     /// add the given amount to the players gold stash
@@ -63,16 +69,37 @@ fn test_get_name() {
         name: "Teddy Tester".to_string(),
         position: Position::new(0, 1, 1),
         life: 5,
-        max_life: 10,
         gold: 0,
         experience: 0,
+        player_stats: PlayerStats {
+            body: 0,
+            agility: 0,
+            mind: 0,
+            strength: 0,
+            toughness: 0,
+            movement: 0,
+            dexterity: 0,
+            wisdom: 0,
+            aura: 0,
+        },
     };
     assert_eq!(p.get_name(), "Teddy Tester");
 }
 
 #[test]
 fn test_can_receive_gold() {
-    let mut p = Player::new("Teddy Tester", 10);
+    let player_stats = PlayerStats {
+        body: 8,
+        agility: 8,
+        mind: 4,
+        strength: 3,
+        toughness: 3,
+        movement: 1,
+        dexterity: 1,
+        wisdom: 0,
+        aura: 0,
+    };
+    let mut p = Player::new("Teddy Tester", player_stats);
     assert_eq!(p.get_gold(), 0);
 
     p.retrieve_gold(13);
@@ -86,22 +113,43 @@ fn test_change_life() {
         name: "Teddy Tester".to_string(),
         position: Position::new(0, 1, 1),
         life: 5,
-        max_life: 10,
         gold: 0,
         experience: 0,
+        player_stats: PlayerStats {
+            body: 0,
+            agility: 0,
+            mind: 0,
+            strength: 0,
+            toughness: 0,
+            movement: 0,
+            dexterity: 0,
+            wisdom: 0,
+            aura: 0,
+        },
     };
     assert_eq!(p.get_life(), 5);
-    p.change_life(-2);
+    p.decrease_life(2);
     assert_eq!(p.get_life(), 3);
-    p.change_life(10);
+    p.increase_life(10);
     assert_eq!(p.get_life(), 10);
-    p.change_life(-12);
+    p.decrease_life(12);
     assert_eq!(p.get_life(), 0);
 }
 
 #[test]
 fn player_can_move() {
-    let mut p = Player::new("Teddy Tester", 10);
+    let player_stats = PlayerStats {
+        body: 8,
+        agility: 8,
+        mind: 4,
+        strength: 3,
+        toughness: 3,
+        movement: 1,
+        dexterity: 1,
+        wisdom: 0,
+        aura: 0,
+    };
+    let mut p = Player::new("Teddy Tester", player_stats);
     assert_eq!(p.get_position(), &Position::new(0, 0, 0));
     p.get_position().change(1, 2);
     assert_eq!(p.get_position(), &Position::new(0, 1, 2));
@@ -119,9 +167,19 @@ fn test_max_life() {
         name: "Teddy Tester".to_string(),
         position: Position::new(0, 1, 1),
         life: 5,
-        max_life: 10,
         gold: 0,
         experience: 0,
+        player_stats: PlayerStats {
+            body: 0,
+            agility: 0,
+            mind: 0,
+            strength: 0,
+            toughness: 0,
+            movement: 0,
+            dexterity: 0,
+            wisdom: 0,
+            aura: 0,
+        },
     };
     assert_eq!(p.get_max_life(), 10);
 }

src/position.rs

@@ -1,4 +1,4 @@
-use std::cmp::max;
+use std::cmp::{max, min};
 
 /// describes an character (PC or NPC) in the dungeon that has a position.
 pub trait HasPosition {
@@ -43,6 +43,28 @@ impl Position {
     }
 
     pub fn get_y(&self) -> usize { self.y }
+
+    /// calculate the distance to the other position using the manhattan metric
+    pub fn distance(&self, other: &Self) -> usize {
+        self.x.abs_diff(other.x) + self.y.abs_diff(other.y)
+    }
+
+    /// get the direction (step size 1) towards the other position
+    pub fn get_direction(&self, other: &Self) -> (i16, i16) {
+        (
+            max(min(other.x as i16 - self.x as i16, 1), -1),
+            max(min(other.y as i16 - self.y as i16, 1), -1)
+        )
+    }
+}
+
+#[test]
+fn test_get_direction() {
+    let p1 = Position::new(0, 10, 10);
+    let p2 = Position::new(0, 8, 8);
+    assert_eq!(p1.get_direction(&p2), (-1, -1));
+    let p2 = Position::new(0, 11, 10);
+    assert_eq!(p1.get_direction(&p2), (1, 0));
 }
 
 #[test]