make size of levels variable

src/artifacts.rs

@@ -6,6 +6,7 @@ use crate::position::Position;
 
 pub trait Artifact {
     //! An artifact that can be collected by the player
+    /// get the character and color used to draw the artifact into the level
     fn get_representation(&self) -> (&str, Color);
     /// get the position of the artifact in the level
     fn get_immutable_position(&self) -> &Position;
@@ -15,13 +16,17 @@ pub trait Artifact {
     fn was_collected(&self) -> bool;
 }
 
+/// An artifact that contains a random amount of gold pieces.
 pub struct Chest {
-    /// a chest that contains some gold
+    /// the chests position
     position: Position,
+    /// the chests value
     gold: usize,
 }
 
 impl Chest {
+    /// create a chest at the given position with a random amount of gold.
+    /// The gold amount depends on the level, the deeper you go, the more you get.
     pub fn new(position: Position) -> Self {
         let min_gold = 10 * (position.get_level() + 1);
         let max_gold = min_gold + 10 * position.get_level();
@@ -54,10 +59,13 @@ impl Artifact for Chest {
     }
 }
 
+#[derive(Clone, Copy)]
+/// An artifact that gives the player some health on consumption.
 pub struct Potion {
     /// a potion that restores some health
     position: Position,
     health: usize,
+    was_collected: bool,
 }
 
 impl Potion {
@@ -67,19 +75,29 @@ impl Potion {
         Self {
             position,
             health: rand::thread_rng().gen_range(min_health_gain..=max_health_gain),
+            was_collected: false,
         }
     }
+
+    pub fn get_health(&self) -> usize {
+        self.health
+    }
 }
 
 impl Artifact for Potion {
     fn get_representation(&self) -> (&str, Color) {
         ("P", Color::Green)
     }
+
     fn get_immutable_position(&self) -> &Position {
         &self.position
     }
+
     fn collect(&mut self, player: &mut Player, messages: &mut Vec<String>) {
-        // only consume potion of the player can gain at least one health point
+        //! called when the player walked on to a potion.
+        //!
+        //! Depending on health status and inventory usage the potion will
+        //! be consumed directly or moved to inventory.
         if !player.is_healthy() {
             let old = player.get_life();
             player.change_life(self.health.try_into().unwrap());
@@ -89,15 +107,16 @@ impl Artifact for Potion {
                 format!("picked up potion and gained {} health.", new - old).to_string(),
             );
             self.health = 0;
+            self.was_collected = true;
+        } else if player.add_to_inventory(self) {
+            messages.insert(0, "move potion to inventory.".to_string());
+            self.was_collected = true;
         } else {
-            messages.insert(
-                0,
-                "not using the potion because you're healthy.".to_string(),
-            );
+            messages.insert(0, "inventory is full.".to_string());
         }
     }
 
     fn was_collected(&self) -> bool {
-        self.health == 0
+        self.was_collected
     }
 }

src/game.rs

@@ -22,6 +22,7 @@ pub struct Game {
     player: Player,
     /// the levels of the game
     levels: Vec<Level>,
+    /// messages that are displayed in the ui
     pub messages: Vec<String>,
 }
 
@@ -130,7 +131,7 @@ impl Game {
                     let (next_level, x, y) = self.next_start();
                     player_level = next_level;
                     self.messages
-                        .insert(0, format!("you climb down to level {}.", next_level));
+                        .insert(0, format!("you climb down to level {}.", next_level + 1));
                     self.get_mutable_player()
                         .get_position()
                         .set(next_level, x, y);
@@ -140,7 +141,7 @@ impl Game {
                     let (next_level, x, y) = self.prev_end();
                     player_level = next_level;
                     self.messages
-                        .insert(0, format!("you climb up to level {}.", next_level));
+                        .insert(0, format!("you climb up to level {}.", next_level + 1));
                     self.get_mutable_player()
                         .get_position()
                         .set(next_level, x, y);

src/level.rs

@@ -6,6 +6,10 @@ use rand::Rng;
 use crate::artifacts::Artifact;
 #[cfg(test)]
 use crate::artifacts::{Chest, Potion};
+use crate::level_generator::ROOMS_HORIZONTAL;
+use crate::level_generator::ROOMS_VERTICAL;
+use crate::level_generator::ROOM_HEIGHT;
+use crate::level_generator::ROOM_WIDTH;
 use crate::monster::Monster;
 #[cfg(test)]
 use crate::monster::{Orc, Rat};
@@ -13,8 +17,8 @@ use crate::player::Player;
 use crate::position::HasPosition;
 use crate::position::Position;
 
-pub const LEVEL_WIDTH: usize = 50;
-pub const LEVEL_HEIGHT: usize = 25;
+pub const LEVEL_WIDTH: usize = 1 + ROOMS_VERTICAL * ROOM_WIDTH;
+pub const LEVEL_HEIGHT: usize = 1 + ROOMS_HORIZONTAL * ROOM_HEIGHT;
 
 #[derive(Copy, Clone, Debug, PartialEq)]
 pub enum StructureElement {

src/level_generator.rs

@@ -14,11 +14,11 @@ use crate::level::{Level, StructureElement};
 use crate::monster::{Monster, Orc, Rat, Snake};
 use crate::position::Position;
 
-const ROOMS_VERTICAL: usize = 7;
-const ROOMS_HORIZONTAL: usize = 4;
+pub const ROOMS_VERTICAL: usize = 9;
+pub const ROOMS_HORIZONTAL: usize = 7;
 
-const ROOM_WIDTH: usize = 7;
-const ROOM_HEIGHT: usize = 6;
+pub const ROOM_WIDTH: usize = 7;
+pub const ROOM_HEIGHT: usize = 6;
 
 #[derive(PartialEq, Copy, Clone)]
 enum RoomType {

src/main.rs

@@ -33,6 +33,9 @@ mod position;
 /// length of a game frame in ms
 pub const FRAME_LENGTH: u64 = 100;
 
+pub const MIN_WIDTH: u16 = 120;
+pub const MIN_HEIGHT: u16 = 30;
+
 //
 fn main() -> Result<()> {
     let mut game = Game::new(Player::new(realname().as_str(), 30));
@@ -54,27 +57,30 @@ fn main() -> Result<()> {
 
             // don't draw stuff except an info box if the terminal is too small (less than 80x25)
             // to prevent the read drawing code from crashing the game.
-            if area.width < 80 || area.height < 25 {
+            if area.width < MIN_WIDTH || area.height < MIN_HEIGHT {
                 let block = Block::default()
                     .title("Info")
                     .borders(Borders::ALL)
                     .border_style(Style::default().fg(Color::White))
                     .border_type(BorderType::Rounded)
                     .style(Style::default().bg(Color::Black));
-                let paragraph = Paragraph::new("Terminal needs to be at leas 80x25!")
-                    .block(block)
-                    .wrap(Wrap { trim: true });
+                let paragraph = Paragraph::new(format!(
+                    "Terminal needs to be at leas {}x{}!",
+                    MIN_WIDTH, MIN_HEIGHT
+                ))
+                .block(block)
+                .wrap(Wrap { trim: true });
                 frame.render_widget(paragraph, area);
                 return;
             }
 
-            if area.width > 80 {
-                area.x = (area.width - 80) / 2;
-                area.width = 80;
+            if area.width > MIN_WIDTH {
+                area.x = (area.width - MIN_WIDTH) / 2;
+                area.width = MIN_WIDTH;
             }
-            if area.height > 25 {
-                area.y = (area.height - 25) / 2;
-                area.height = 25;
+            if area.height > MIN_HEIGHT {
+                area.y = (area.height - level::LEVEL_HEIGHT as u16) / 2;
+                area.height = level::LEVEL_HEIGHT as u16;
             }
 
             let map_area = Rect {
@@ -86,10 +92,10 @@ fn main() -> Result<()> {
             frame.render_stateful_widget(LevelWidget {}, map_area, &mut game);
 
             let stats_area = Rect {
-                x: area.x + 50,
+                x: area.x + map_area.width,
                 y: area.y,
-                width: 30,
-                height: 15,
+                width: MIN_WIDTH - map_area.width,
+                height: map_area.height / 2 + 1,
             };
             let block = Block::default()
                 .title(
@@ -103,22 +109,24 @@ fn main() -> Result<()> {
                 .style(Style::default().bg(Color::Blue));
             frame.render_widget(
                 Paragraph::new(format!(
-                    "Health: {}/{}\nExp: {}\nGold: {}\nLevel: {}",
+                    "Health: {}/{}\nExp: {}\nGold: {}\nLevel: {}\nInventory: {}/{}",
                     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() + 1
+                    game.get_player().get_immutable_position().get_level() + 1,
+                    game.get_player().inventory_size().0,
+                    game.get_player().inventory_size().1,
                 ))
                 .block(block)
                 .wrap(Wrap { trim: true }),
                 stats_area,
             );
             let messages_area = Rect {
-                x: area.x + 50,
-                y: area.y + 15,
-                width: 30,
-                height: 10,
+                x: area.x + map_area.width,
+                y: area.y + map_area.height / 2 + 1,
+                width: MIN_WIDTH - map_area.width,
+                height: map_area.height / 2,
             };
             // Display the latest messages from the game to the user
             let block = Block::default()
@@ -155,6 +163,19 @@ fn main() -> Result<()> {
                                     .to_string(),
                             );
                         }
+                        KeyCode::Char('p') => {
+                            let gained_health = game.get_mutable_player().consume_inventory();
+                            if gained_health > 0 {
+                                game.messages.insert(
+                                    0,
+                                    format!(
+                                        "used a potion from inventory and gained {} health.",
+                                        gained_health
+                                    )
+                                    .to_string(),
+                                );
+                            }
+                        }
                         KeyCode::Char('q') => {
                             break;
                         }

src/player.rs

@@ -1,6 +1,7 @@
 use rand::Rng;
 use std::cmp::{max, min};
 
+use crate::artifacts::Potion;
 use crate::position::{HasPosition, Position};
 
 pub struct Player {
@@ -10,6 +11,8 @@ pub struct Player {
     max_life: i16,
     gold: usize,
     experience: usize,
+    inventory: Vec<Potion>,
+    inventory_slots: usize,
 }
 
 impl Player {
@@ -21,6 +24,8 @@ impl Player {
             max_life,
             gold: 0,
             experience: 0,
+            inventory: vec![],
+            inventory_slots: 2,
         }
     }
     pub fn get_name(&self) -> String {
@@ -65,6 +70,30 @@ impl Player {
     pub fn damage(&self) -> usize {
         rand::thread_rng().gen_range(1..4)
     }
+
+    pub fn add_to_inventory(&mut self, potion: &Potion) -> bool {
+        if self.inventory.len() < self.inventory_slots {
+            self.inventory.push(*potion);
+            true
+        } else {
+            false
+        }
+    }
+
+    pub fn inventory_size(&self) -> (usize, usize) {
+        (self.inventory.len(), self.inventory_slots)
+    }
+
+    pub fn consume_inventory(&mut self) -> usize {
+        if self.is_healthy() {
+            return 0;
+        }
+        if let Some(potion) = self.inventory.pop() {
+            self.change_life(potion.get_health() as i16);
+            return potion.get_health();
+        }
+        0
+    }
 }
 
 impl HasPosition for Player {
@@ -85,6 +114,7 @@ fn test_get_name() {
         max_life: 10,
         gold: 0,
         experience: 0,
+        inventory: vec![],
     };
     assert_eq!(p.get_name(), "Teddy Tester");
 }
@@ -108,6 +138,7 @@ fn test_change_life() {
         max_life: 10,
         gold: 0,
         experience: 0,
+        inventory: vec![],
     };
     assert_eq!(p.get_life(), 5);
     p.change_life(-2);
@@ -141,6 +172,7 @@ fn test_max_life() {
         max_life: 10,
         gold: 0,
         experience: 0,
+        inventory: vec![],
     };
     assert_eq!(p.get_max_life(), 10);
 }