first steps with refs

src/game.rs

@@ -1,7 +1,23 @@
 use crate::level::Level;
 use crate::player::Player;
 
+pub const LEVELS: usize = 2;
+
 pub struct Game<'game> {
     pub player: &'game mut Player,
-    pub levels: Vec<&'game mut Level>,
+    pub levels: Vec<Level>,
+}
+
+impl Game<'_> {
+    pub fn new(p: &mut Player) -> Game {
+        let mut v: Vec<Level> = Vec::with_capacity(LEVELS);
+        for _ in 0..LEVELS {
+            let mut l = Level::new();
+            v.push(l);
+        }
+        Game {
+            player: p,
+            levels: v,
+        }
+    }
 }

src/level.rs

@@ -1,38 +1,115 @@
+use std::cmp::{max,min};
+use crate::position::Position;
+
+pub const LEVEL_WIDTH: usize = 50;
+pub const LEVEL_HEIGHT: usize = 25;
+
 #[derive(Copy, Clone, Debug, PartialEq)]
-enum LevelElement {
+enum StructureElement {
     Wall,
     Floor,
     StairDown,
     StairUp,
+    Unknown,
 }
 
 #[derive(Copy, Clone, Debug, PartialEq)]
 pub struct Level {
-    structure: [[LevelElement; 25]; 80],
+    structure: [[StructureElement; LEVEL_HEIGHT]; LEVEL_WIDTH],
+    discovered: [[bool; LEVEL_HEIGHT]; LEVEL_WIDTH],
 }
 
 impl Level {
     pub fn new() -> Level {
-        let mut s = [[LevelElement::Wall; 25]; 80];
-        s[4][4] = LevelElement::StairDown;
-        s[75][20] = LevelElement::StairUp;
+        let mut s = [[StructureElement::Wall; LEVEL_HEIGHT]; LEVEL_WIDTH];
+        for x in 2..LEVEL_WIDTH - 2 {
+            for y in 2..LEVEL_HEIGHT - 2 {
+                s[x][y] = StructureElement::Floor;
+            }
+        }
         Level {
-            structure: s
+            structure: s,
+            discovered: [[false; LEVEL_HEIGHT]; LEVEL_WIDTH],
         }
     }
-    pub fn get_element(&self, x: usize, y: usize) -> Option<LevelElement> {
-        if x >= 80 || y >= 25 {
+    pub fn get_element(&self, x: i16, y: i16) -> Option<StructureElement> {
+        if x < 0 || y < 0 {
             return None;
         }
+        let x = x as usize;
+        let y = y as usize;
+        if x >= LEVEL_WIDTH || y >= LEVEL_HEIGHT {
+            return None;
+        }
+        if !self.discovered[x][y] {
+            return Some(StructureElement::Unknown);
+        }
         Some(self.structure[x][y])
     }
+    /// discover the area with in the level around the given position
+    pub fn discover(&mut self, pos: &Position) {
+        let x = pos.get_x();
+        let y = pos.get_y();
+
+        // uncover fields directly next to the player
+        for x_r in max(x - 1, 0)..=min(x + 1, LEVEL_WIDTH - 1) {
+            for y_r in max(y - 1, 0)..=min(y + 1, LEVEL_HEIGHT - 1) {
+                self.discovered[x_r][y_r] = true;
+            }
+        }
+
+        // uncover fields up to 2 fields right of the player
+        for x_r in x..=min(x + 2, LEVEL_WIDTH - 1) {
+            self.discovered[x_r][y] = true;
+            if self.structure[x_r][y] == StructureElement::Wall {
+                break;
+            }
+        }
+
+        // uncover fields up to 2 fields below of the player
+        for y_r in y..=min(y + 2, LEVEL_HEIGHT - 1) {
+            self.discovered[x][y_r] = true;
+            if self.structure[x][y_r] == StructureElement::Wall {
+                break;
+            }
+        }
+
+        // uncover fields up to 2 fields left of the player
+        for x_r in (max(x, 2)..x + 2).rev() {
+            self.discovered[x_r - 2][y] = true;
+            if self.structure[x_r - 2][y] == StructureElement::Wall {
+                break;
+            }
+        }
+
+        // uncover fields up to 2 fields above of the player
+        for y_r in (max(y, 2)..y + 2).rev() {
+            self.discovered[x][y_r - 2] = true;
+            if self.structure[x][y_r - 2] == StructureElement::Wall {
+                break;
+            }
+        }
+    }
 }
 
 #[test]
 fn test_get_element() {
     let l = Level::new();
-    assert_eq!(l.get_element(0, 0).unwrap(), LevelElement::Wall);
-    assert_eq!(l.get_element(4, 4).unwrap(), LevelElement::StairDown);
-    assert_eq!(l.get_element(79, 24).unwrap(), LevelElement::Wall);
-    assert_eq!(l.get_element(80, 25), None);
+    assert_eq!(l.get_element(-1, -1), None);
+    assert_eq!(l.get_element(0, 0).unwrap(), StructureElement::Unknown);
+    assert_eq!(l.get_element(LEVEL_WIDTH as i16 - 1, LEVEL_HEIGHT as i16 - 1).unwrap(), StructureElement::Unknown);
+    assert_eq!(l.get_element(LEVEL_WIDTH as i16, LEVEL_HEIGHT as i16), None);
+}
+
+#[test]
+fn test_discover_get_element() {
+    let mut l = Level::new();
+    assert_eq!(l.get_element(10, 10).unwrap(), StructureElement::Unknown);
+    let p = Position::new(0, 10, 10);
+    l.discover(&p);
+    assert_eq!(l.get_element(10, 10).unwrap(), StructureElement::Floor);
+    assert_eq!(l.get_element(9, 10).unwrap(), StructureElement::Floor);
+    assert_eq!(l.get_element(10, 9).unwrap(), StructureElement::Floor);
+    assert_eq!(l.get_element(11, 10).unwrap(), StructureElement::Floor);
+    assert_eq!(l.get_element(10, 11).unwrap(), StructureElement::Floor);
 }

src/main.rs

@@ -6,13 +6,11 @@ mod game;
 mod player;
 mod level;
 mod position;
+mod monster;
 
 fn main() {
     let mut p = Player::new("Teddy Tester", 10);
-    let g = Game {
-        player: &mut p,
-        levels: Vec::new()
-    };
+    let g = Game::new(&mut p);
 
     println!("{}",g.player.get_name());
     println!("{}",g.player.get_life());

src/monster.rs

@@ -0,0 +1,50 @@
+use std::cmp::{max, min};
+
+use crate::position::Position;
+
+pub struct Monster {
+    life: usize,
+    position: Position,
+}
+
+impl Monster {
+    pub fn new(life: usize) -> Self {
+        Monster {
+            life,
+            position: Position::new(0, 0, 0),
+        }
+    }
+    pub fn get_life(&self) -> usize { self.life }
+    pub fn is_dead(&self) -> bool { self.life <= 0 }
+    pub fn decrease_life(&mut self, by: i16) {
+        self.life = max(0, self.life as i16 - by) as usize;
+    }
+    pub fn get_position(&mut self) -> &mut Position {
+        &mut self.position
+    }
+}
+
+#[test]
+fn monsters_can_move() {
+    let mut m = Monster::new(2);
+    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));
+    m.get_position().change(2, 1);
+    assert_eq!(m.get_position(), &Position::new(0, 3, 3));
+    m.get_position().set(1, 2, 3);
+    m.get_position().change(2, 1);
+    assert_eq!(m.get_position(), &Position::new(1, 4, 4));
+}
+
+#[test]
+fn monsters_can_die() {
+    let mut m = Monster::new(2);
+    assert_eq!(m.get_life(), 2);
+    assert_eq!(m.is_dead(), false);
+    m.decrease_life(1);
+    assert_eq!(m.get_life(), 1);
+    m.decrease_life(2);
+    assert_eq!(m.get_life(), 0);
+    assert_eq!(m.is_dead(), true);
+}

src/player.rs

@@ -12,7 +12,7 @@ impl Player {
     pub fn new(name: &str, max_life: i16) -> Player {
         Player {
             name: name.to_string(),
-            position: Position::new(0, 1, 1),
+            position: Position::new(0, 0, 0),
             life: max_life,
             max_life,
         }
@@ -26,6 +26,9 @@ impl Player {
     pub fn get_life(&self) -> i16 {
         self.life
     }
+    pub fn get_position(&mut self) -> &mut Position {
+        &mut self.position
+    }
 }
 
 #[test]
@@ -55,3 +58,16 @@ fn test_change_life() {
     p.change_life(-12);
     assert_eq!(p.life, 0);
 }
+
+#[test]
+fn player_can_move() {
+    let mut p = Player::new("Teddy Tester", 10);
+    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));
+    p.get_position().change(2, 1);
+    assert_eq!(p.get_position(), &Position::new(0, 3, 3));
+    p.get_position().set(1, 2, 3);
+    p.get_position().change(2, 1);
+    assert_eq!(p.get_position(), &Position::new(1, 4, 4));
+}

src/position.rs

@@ -1,15 +1,33 @@
+#[derive(PartialEq, Debug)]
 pub struct Position {
-    level: u8,
-    x: u8,
-    y: u8,
+    level: usize,
+    x: usize,
+    y: usize,
 }
 
 impl Position {
-    pub fn new(level: u8, x: u8, y: u8) -> Self {
+    pub fn new(level: usize, x: usize, y: usize) -> Self {
         Self {
             level,
             x,
             y,
         }
     }
+    pub fn change(&mut self, dx: i16, dy: i16) {
+        self.x = ((self.x as i16) + dx) as usize;
+        self.y = ((self.y as i16) + dy) as usize;
+    }
+    pub fn set(&mut self, level: usize, x: usize, y: usize) {
+        self.level = level;
+        self.x = x;
+        self.y = y;
+    }
+
+    pub fn get_x(&self) -> usize {
+        self.x
+    }
+
+    pub fn get_y(&self) -> usize {
+        self.y
+    }
 }