level generator works

fixing imports and stuff

.idea/el_diabolo.iml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="EMPTY_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <excludeFolder url="file://$MODULE_DIR$/target" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

Cargo.lock

@@ -86,9 +86,34 @@ name = "el_diabolo"
 version = "0.1.0"
 dependencies = [
  "crossterm",
+ "petgraph",
+ "rand",
  "ratatui",
 ]
 
+[[package]]
+name = "equivalent"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
+
+[[package]]
+name = "fixedbitset"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"
+
+[[package]]
+name = "getrandom"
+version = "0.2.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fe9006bed769170c11f845cf00c7c1e9092aeb3f268e007c3e760ac68008070f"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
 [[package]]
 name = "hashbrown"
 version = "0.14.2"
@@ -105,6 +130,16 @@ version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
 
+[[package]]
+name = "indexmap"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d530e1a18b1cb4c484e6e34556a0d948706958449fca0cab753d649f2bce3d1f"
+dependencies = [
+ "equivalent",
+ "hashbrown",
+]
+
 [[package]]
 name = "indoc"
 version = "2.0.4"
@@ -198,6 +233,22 @@ version = "1.0.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "de3145af08024dea9fa9914f381a17b8fc6034dfb00f3a84013f7ff43f29ed4c"
 
+[[package]]
+name = "petgraph"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e1d3afd2628e69da2be385eb6f2fd57c8ac7977ceeff6dc166ff1657b0e386a9"
+dependencies = [
+ "fixedbitset",
+ "indexmap",
+]
+
+[[package]]
+name = "ppv-lite86"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.69"
@@ -216,6 +267,36 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+dependencies = [
+ "getrandom",
+]
+
 [[package]]
 name = "ratatui"
 version = "0.24.0"

Cargo.toml

@@ -8,3 +8,5 @@ edition = "2021"
 [dependencies]
 ratatui = "0.24.0"
 crossterm = "0.27.0"
+rand = "0.8.5"
+petgraph = "0.6.4"

src/game.rs

@@ -1,7 +1,30 @@
-use crate::level::Level;
+use crate::level::{Level, LevelElement};
 use crate::player::Player;
 
 pub struct Game {
     pub player: Player,
-    pub levels: [Level; 25]
+    pub levels: [Level; 25],
+}
+
+impl Game {
+    pub fn move_player(&mut self, dx: i8, dy: i8) {
+        // check if move is allowed first
+        let player = &self.player;
+        let player_pos = player.get_position();
+        let level = &self.levels[player_pos.get_level() as usize];
+        let new_x = ((player_pos.get_x() as i16) + dx as i16) as u16;
+        let new_y = ((player_pos.get_y() as i16) + dy as i16) as u16;
+        let can_go: bool = match level.get_element(new_x as i16, new_y as i16) {
+            None => { false }
+            Some(t) => {
+                match t {
+                    LevelElement::Wall => { false }
+                    _ => { true }
+                }
+            }
+        };
+        if can_go {
+            self.player.change_position(dx, dy);
+        }
+    }
 }

src/level.rs

@@ -1,30 +1,48 @@
+pub const LEVEL_WIDTH: usize = 50;
+pub const LEVEL_HEIGHT: usize = 25;
+
 #[derive(Copy, Clone, Debug, PartialEq)]
-enum LevelElement {
+pub enum LevelElement {
     Wall,
     Floor,
     StairDown,
     StairUp,
 }
 
+#[derive(Copy, Clone, Debug, PartialEq)]
+pub enum RoomType {
+    Start,
+    End,
+    StairUp,
+    StairDown,
+    BasicRoom,
+    EmptyRoom,
+}
+
 #[derive(Copy, Clone, Debug, PartialEq)]
 pub struct Level {
-    structure: [[LevelElement; 25]; 80],
+    pub(crate) structure: [[LevelElement; LEVEL_HEIGHT]; LEVEL_WIDTH],
+    pub(crate) start_x: usize,
+    pub(crate) start_y: usize,
 }
 
 impl Level {
     pub fn new() -> Level {
-        let mut s = [[LevelElement::Wall; 25]; 80];
-        s[4][4] = LevelElement::StairDown;
-        s[75][20] = LevelElement::StairUp;
+        let s = [[LevelElement::Wall; LEVEL_HEIGHT]; LEVEL_WIDTH];
         Level {
-            structure: s
+            structure: s,
+            start_x: 1,
+            start_y: 1,
         }
     }
-    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<LevelElement> {
+        if x < 0 || y < 0 {
             return None;
         }
-        Some(self.structure[x][y])
+        if x >= LEVEL_WIDTH as i16 || y >= LEVEL_HEIGHT as i16 {
+            return None;
+        }
+        Some(self.structure[x as usize][y as usize])
     }
 }
 
@@ -33,6 +51,6 @@ 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(49, 24).unwrap(), LevelElement::Wall);
+    assert_eq!(l.get_element(50, 25), None);
 }

src/level_generator.rs

@@ -0,0 +1,294 @@
+use std::cmp::{max, min};
+use std::ops::Range;
+use rand::prelude::SliceRandom;
+use rand::Rng;
+use petgraph::graph::UnGraph;
+use petgraph::graph::Graph;
+use petgraph::data::*;
+use petgraph::algo::min_spanning_tree;
+use rand::rngs::ThreadRng;
+
+use crate::level::{Level, LevelElement, RoomType};
+
+const ROOMS_VERTICAL: usize = 7;
+const ROOMS_HORIZONTAL: usize = 4;
+const ROOM_WIDTH: usize = 7;
+const ROOM_HEIGHT: usize = 6;
+
+#[derive(Copy, Clone, Debug, PartialEq)]
+struct ConnectionInfo {
+    offset: usize,
+    distance: usize,
+}
+
+#[derive(Copy, Clone, Debug, PartialEq)]
+struct Room {
+    pub kind: RoomType,
+    pub offset_x: usize,
+    pub offset_y: usize,
+    pub width: usize,
+    pub height: usize,
+    pub connection_down: Option<ConnectionInfo>,
+    pub connection_right: Option<ConnectionInfo>,
+    // pub connected: bool,
+}
+
+impl Room {
+    fn new() -> Self {
+        Self {
+            kind: RoomType::EmptyRoom,
+            offset_x: 0,
+            offset_y: 0,
+            width: 0,
+            height: 0,
+            connection_down: None,
+            connection_right: None,
+            // connected: false,
+        }
+    }
+    /// change the size and position of a room randomly within its bounds
+    fn random(&mut self, rng: &mut ThreadRng) {
+        let width = rng.gen_range(3..6);
+        let height = rng.gen_range(3..5);
+        self.width = width;
+        self.height = height;
+        self.offset_x = rng.gen_range(0..(ROOM_WIDTH - width));
+        self.offset_y = rng.gen_range(0..(ROOM_HEIGHT - height));
+    }
+    fn get_x_range(&self) -> Range<usize> {
+        self.offset_x..self.offset_x + self.width
+    }
+    fn get_y_range(&self) -> Range<usize> {
+        self.offset_y..self.offset_y + self.height
+    }
+}
+
+#[derive(Debug)]
+pub struct LevelGenerator {
+    rooms: [[Room; ROOMS_HORIZONTAL]; ROOMS_VERTICAL],
+}
+
+impl LevelGenerator {
+    pub fn generate(level: usize) -> Self {
+        let mut rng = rand::thread_rng();
+        let mut rooms = [[Room::new(); ROOMS_HORIZONTAL]; ROOMS_VERTICAL];
+        let mut graph = UnGraph::<(usize, usize), u16>::default();
+
+        // trick the room_connectable function into failing on the first iteration
+        rooms[0][0].kind = RoomType::BasicRoom;
+
+        while !LevelGenerator::rooms_connectable(&rooms) {
+            let mut room_types: Vec<RoomType> = Vec::with_capacity(ROOMS_HORIZONTAL * ROOMS_VERTICAL);
+            // level 0 contains a start room, all others contain a stair up
+            if level == 0 {
+                room_types.push(RoomType::Start);
+            } else {
+                room_types.push(RoomType::StairUp);
+            }
+            // level 24 (the last) contains an end room, all others a stair down
+            if level == 24 {
+                room_types.push(RoomType::End);
+            } else {
+                room_types.push(RoomType::StairDown);
+            }
+            // generate a random set of rooms and shuffle them
+            for _ in room_types.len()..ROOMS_HORIZONTAL * ROOMS_VERTICAL {
+                match rng.gen_range(1..=6) {
+                    // TODO tune room type distribution
+                    1..=3 => { room_types.push(RoomType::EmptyRoom) }
+                    _ => { room_types.push(RoomType::BasicRoom) }
+                }
+            }
+            room_types.shuffle(&mut rng);
+
+            graph.clear();
+            // place the rooms in the array an add nodes to the graph for every non empty room
+            for c in 0..ROOMS_VERTICAL {
+                for r in 0..ROOMS_HORIZONTAL {
+                    rooms[c][r].kind = room_types.pop().unwrap();
+                    if rooms[c][r].kind != RoomType::EmptyRoom {
+                        rooms[c][r].random(&mut rng);
+                        graph.add_node((c, r));
+                    }
+                }
+            }
+        }
+
+        // add edges to the graph connecting each room to all of its neighbours (max 4 of them)
+        for c in 0..ROOMS_VERTICAL {
+            for r in 0..ROOMS_HORIZONTAL {
+                if rooms[c][r].kind == RoomType::EmptyRoom {
+                    continue;
+                }
+                let src_index = graph.node_indices().find(|i| graph[*i] == (c, r)).unwrap();
+                for r_1 in r + 1..ROOMS_HORIZONTAL {
+                    if rooms[c][r_1].kind != RoomType::EmptyRoom {
+                        let tgt_index = graph.node_indices().find(|i| graph[*i] == (c, r_1)).unwrap();
+                        // todo use random weight for edge
+                        graph.add_edge(src_index, tgt_index, 1);
+                        break;
+                    }
+                }
+                for c_1 in c + 1..ROOMS_VERTICAL {
+                    if rooms[c_1][r].kind != RoomType::EmptyRoom {
+                        let tgt_index = graph.node_indices().find(|i| graph[*i] == (c_1, r)).unwrap();
+                        // todo use random weight for edge
+                        graph.add_edge(src_index, tgt_index, 1);
+                        break;
+                    }
+                }
+            }
+        }
+
+        // calculate a minimum spanning tree
+        let mst: Graph<(usize, usize), u16, petgraph::Undirected> = Graph::from_elements(min_spanning_tree(&graph));
+        for edge in mst.raw_edges() {
+            let src = mst[edge.source()];
+            let tgt = mst[edge.target()];
+
+            let src_room = rooms[src.0][src.1];
+            let mut tgt_room = rooms[tgt.0][tgt.1];
+
+            // cols are the same, either up or down
+            if src.0 == tgt.0 {
+                let range = LevelGenerator::range_overlap(src_room.get_x_range(), tgt_room.get_x_range());
+                let position: usize;
+                if range.is_empty() {
+                    position = range.start;
+                } else {
+                    position = rng.gen_range(range);
+                }
+                if src.1 < tgt.1 {
+                    // src to tgt
+                    rooms[src.0][src.1].connection_down = Some(ConnectionInfo { offset: position, distance: tgt.1 - src.1 });
+                } else {
+                    // tgt to src
+                    tgt_room.connection_down = Some(ConnectionInfo { offset: position, distance: src.1 - tgt.1 });
+                }
+            }
+            // rows are the same, either left or right
+            if src.1 == tgt.1 {
+                let range = LevelGenerator::range_overlap(src_room.get_y_range(), tgt_room.get_y_range());
+                let mut position: usize;
+                if range.is_empty() {
+                    position = range.start;
+                } else {
+                    position = rng.gen_range(range);
+                }
+                if src.1 == 0 && position == 0 {
+                    position = 1;
+                }
+                if src.0 < tgt.0 {
+                    // src to tgt
+                    rooms[src.0][src.1].connection_right = Some(ConnectionInfo { offset: position, distance: tgt.0 - src.0 });
+                } else {
+                    // tgt to src
+                    tgt_room.connection_right = Some(ConnectionInfo { offset: position, distance: src.1 - tgt.1 });
+                }
+            }
+        }
+
+        LevelGenerator {
+            rooms
+        }
+    }
+
+    fn range_overlap(r1: Range<usize>, r2: Range<usize>) -> Range<usize> {
+        max(r1.start, r2.start)..min(r1.end, r2.end)
+    }
+
+    /// Verifies that for a given matrix of rooms each room has at least one other room in the
+    /// same row or column.
+    fn rooms_connectable(rooms: &[[Room; ROOMS_HORIZONTAL]; ROOMS_VERTICAL]) -> bool {
+        for c in 0..ROOMS_VERTICAL {
+            for r in 0..ROOMS_HORIZONTAL {
+                if rooms[c][r].kind != RoomType::EmptyRoom {
+                    let mut connected = 0;
+                    for c1 in 0..ROOMS_VERTICAL {
+                        if rooms[c1][r].kind != RoomType::EmptyRoom {
+                            connected += 1;
+                        }
+                    }
+                    for r1 in 0..ROOMS_HORIZONTAL {
+                        if rooms[c][r1].kind != RoomType::EmptyRoom {
+                            connected += 1;
+                        }
+                    }
+                    if connected <= 2 {
+                        return false;
+                    }
+                }
+            }
+        }
+        return true;
+    }
+    pub fn render(&self) -> Level {
+        let mut rng = rand::thread_rng();
+        let mut s = [[LevelElement::Wall; 1 + ROOMS_HORIZONTAL * ROOM_HEIGHT]; 1 + ROOMS_VERTICAL * ROOM_WIDTH];
+        let mut start_x: usize = 0;
+        let mut start_y: usize = 0;
+        for c in 0..ROOMS_VERTICAL {
+            for r in 0..ROOMS_HORIZONTAL {
+                let top = 1 + r * ROOM_HEIGHT;
+                let left = 1 + c * ROOM_WIDTH;
+                let room = self.rooms[c][r];
+                for x in 0..room.width {
+                    for y in 0..room.height {
+                        s[left + room.offset_x + x][top + room.offset_y + y] = LevelElement::Floor;
+                    }
+                }
+                if room.kind == RoomType::StairDown {
+                    s[left + room.offset_x + rng.gen_range(0..room.width)][top + room.offset_y + rng.gen_range(0..room.height)] = LevelElement::StairDown;
+                }
+                if room.kind == RoomType::Start || room.kind == RoomType::StairUp {
+                    start_x = left + room.offset_x + rng.gen_range(0..room.width);
+                    start_y = top + room.offset_y + rng.gen_range(0..room.height);
+                }
+                if room.kind == RoomType::StairUp {
+                    s[start_x][start_y] = LevelElement::StairUp;
+                }
+            }
+        }
+        //
+        for c in 0..ROOMS_VERTICAL {
+            for r in 0..ROOMS_HORIZONTAL {
+                let src_room = self.rooms[c][r];
+                if let Some(x_conn) = src_room.connection_down {
+                    let tgt_room = self.rooms[c][r + x_conn.distance];
+                    let top = 1 + r * ROOM_HEIGHT + src_room.offset_y;
+                    let left = 1 + c * ROOM_WIDTH + x_conn.offset;
+                    let bottom = 1 + (r + x_conn.distance) * ROOM_HEIGHT + tgt_room.offset_y + tgt_room.height;
+                    for i in top..bottom {
+                        if s[left][i] == LevelElement::Wall {
+                            s[left][i] = LevelElement::Floor;
+                        }
+                    }
+                }
+                if let Some(y_conn) = src_room.connection_right {
+                    let tgt_room = self.rooms[c + y_conn.distance][r];
+
+                    let top = 1 + r * ROOM_HEIGHT + src_room.offset_y + y_conn.offset - 1;
+                    let left = 1 + c * ROOM_WIDTH + src_room.offset_x;
+                    let right = 1 + (c + y_conn.distance) * ROOM_WIDTH + tgt_room.offset_x + tgt_room.width;
+                    for i in left..right {
+                        if s[i][top] == LevelElement::Wall {
+                            s[i][top] = LevelElement::Floor;
+                        }
+                    }
+                }
+            }
+        }
+        Level {
+            structure: s,
+            start_x,
+            start_y,
+        }
+    }
+}
+
+#[test]
+fn test_level_gen() {
+    let level = LevelGenerator::generate(0);
+    println!("{:?}", level);
+    assert_eq!(1, 2);
+}

src/level_widget.rs

@@ -0,0 +1,155 @@
+use ratatui::prelude::*;
+use ratatui::widgets::Widget;
+
+use crate::game::Game;
+use crate::level::LevelElement;
+
+const FG_BROWN: Color = Color::Rgb(186, 74, 0);
+
+pub struct LevelWidget<'a> {
+    pub game: &'a Game,
+}
+
+impl<'a> LevelWidget<'a> {
+    fn set_cell(&self, buf: &mut Buffer, x: u16, y: u16, symbol: &str, fg: Color, bg: Color) {
+        buf.
+            get_mut(x, y).
+            set_symbol(symbol).
+            set_bg(bg).
+            set_fg(fg);
+    }
+
+    fn calculate_wall(top: Option<LevelElement>, right: Option<LevelElement>, bottom: Option<LevelElement>, left: Option<LevelElement>) -> String {
+        let mut val = 0;
+        val += match top {
+            Some(n) => {
+                match n {
+                    LevelElement::Wall => 1,
+                    _ => 0
+                }
+            }
+            None => 0
+        };
+        val += match right {
+            Some(n) => {
+                match n {
+                    LevelElement::Wall => 2,
+                    _ => 0
+                }
+            }
+            None => 0
+        };
+        val += match bottom {
+            Some(n) => {
+                match n {
+                    LevelElement::Wall => 4,
+                    _ => 0
+                }
+            }
+            None => 0
+        };
+        val += match left {
+            Some(n) => {
+                match n {
+                    LevelElement::Wall => 8,
+                    _ => 0
+                }
+            }
+            None => 0
+        };
+        [
+            "╋", "┃", "━", "┗",
+            "┃", "┃", "┏", "┣",
+            "━", "┛", "━", "┻",
+            "┓", "┫", "┳", "╋",
+        ][val].to_string()
+    }
+}
+
+impl<'a> Widget for LevelWidget<'a> {
+    fn render(self, area: Rect, buf: &mut Buffer) {
+        let player = &self.game.player;
+        let player_pos = player.get_position();
+        let level = &self.game.levels[player_pos.get_level() as usize];
+
+        let al = area.left();
+        let at = area.top();
+
+        // draw the level elements
+        for x in al..area.right() {
+            for y in at..area.bottom() {
+                let level_x = (x - al) as i16;
+                let level_y = (y - at) as i16;
+                match level.get_element(level_x, level_y) {
+                    None => {}
+                    Some(e) => {
+                        match e {
+                            LevelElement::Wall => {
+                                let top = level.get_element(level_x, level_y - 1);
+                                let right = level.get_element(level_x + 1, level_y);
+                                let bottom = level.get_element(level_x, level_y + 1);
+                                let left = level.get_element(level_x - 1, level_y);
+                                let symbol = LevelWidget::calculate_wall(top, right, bottom, left);
+                                self.set_cell(buf, x, y, symbol.as_str(), FG_BROWN, Color::Gray);
+                            }
+                            LevelElement::Floor => {
+                                self.set_cell(buf, x, y, " ", FG_BROWN, Color::Gray);
+                            }
+                            LevelElement::StairDown => {
+                                self.set_cell(buf, x, y, ">", Color::Yellow, Color::Gray);
+                            }
+                            LevelElement::StairUp => {
+                                self.set_cell(buf, x, y, "<", Color::Yellow, Color::Gray);
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        // draw player
+        self.set_cell(buf, al + player_pos.get_x(), at + player_pos.get_y(), "8", Color::Red, Color::Gray);
+    }
+}
+
+#[test]
+fn test_get_wall_symbol() {
+    let wall = Some(LevelElement::Wall);
+    // 0
+    let s = LevelWidget::calculate_wall(None, None, None, None);
+    assert_eq!(s, "╋");
+    // 15
+    let s = LevelWidget::calculate_wall(wall, wall, wall, wall);
+    assert_eq!(s, "╋");
+
+    // 1
+    let s = LevelWidget::calculate_wall(wall, None, None, None);
+    assert_eq!(s, "┃");
+    // 5
+    let s = LevelWidget::calculate_wall(wall, None, wall, None);
+    assert_eq!(s, "┃");
+    // 4
+    let s = LevelWidget::calculate_wall(None, None, wall, None);
+    assert_eq!(s, "┃");
+
+    // 2
+    let s = LevelWidget::calculate_wall(None, wall, None, None);
+    assert_eq!(s, "━");
+    // 10
+    let s = LevelWidget::calculate_wall(None, wall, None, wall);
+    assert_eq!(s, "━");
+
+    // 9
+    let s = LevelWidget::calculate_wall(wall, None, None, wall);
+    assert_eq!(s, "┛");
+    // 3
+    let s = LevelWidget::calculate_wall(wall, wall, None, None);
+    assert_eq!(s, "┗");
+    // 6
+    let s = LevelWidget::calculate_wall(None, wall, wall, None);
+    assert_eq!(s, "┏");
+    // 12
+    let s = LevelWidget::calculate_wall(None, None, wall, wall);
+    assert_eq!(s, "┓");
+}
+

src/main.rs

@@ -1,16 +1,109 @@
+use crossterm::{
+    event::{self, KeyCode, KeyEventKind},
+    terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
+    ExecutableCommand,
+};
+use ratatui::{
+    prelude::{CrosstermBackend, Stylize, Terminal},
+    widgets::Paragraph,
+};
+use std::io::{stdout, Result};
+use ratatui::prelude::*;
+use ratatui::widgets::Block;
+
 use crate::game::Game;
 use crate::level::Level;
+use crate::level_widget::LevelWidget;
 use crate::player::Player;
+use crate::level_generator::LevelGenerator;
 
 mod game;
 mod player;
 mod level;
 mod position;
+mod level_widget;
+mod level_generator;
 
-fn main() {
-    let g = Game {
+fn main() -> Result<()> {
+    let mut levels: [Level; 25] = [Level::new(); 25];
+    for l in 0..25 {
+        levels[l] = LevelGenerator::generate(l).render();
+    }
+    let mut g = Game {
         player: Player::new("Teddy Tester", 10),
-        levels: [Level::new();25]
+        levels,
     };
-    println!("{}",g.player.get_name());
+
+    g.player.change_position((levels[0].start_x) as i8, (levels[0].start_y) as i8);
+
+    stdout().execute(EnterAlternateScreen)?;
+    enable_raw_mode()?;
+    let mut terminal = Terminal::new(CrosstermBackend::new(stdout()))?;
+    terminal.clear()?;
+
+    loop {
+        terminal.draw(|frame| {
+            let mut area = frame.size();
+            frame.render_widget(Block::default().style(Style::default().bg(Color::Green)), area);
+
+            if area.width > 80 {
+                area.x = (area.width - 80) / 2;
+                area.width = 80;
+            }
+            if area.height > 25 {
+                area.y = (area.height - 25) / 2;
+                area.height = 25;
+            }
+
+            let map_area = Rect {
+                x: area.x,
+                y: area.y,
+                width: level::LEVEL_WIDTH as u16,
+                height: level::LEVEL_HEIGHT as u16,
+            };
+            frame.render_widget(LevelWidget { game: &g }, map_area);
+
+            let stats_area = Rect {
+                x: area.x + 50,
+                y: area.y,
+                width: 30,
+                height: 25,
+            };
+            frame.render_widget(
+                Paragraph::new(format!("{}\nHealth: {}/{}\n{}/{}/{}",
+                                       g.player.get_name(),
+                                       g.player.get_life(),
+                                       g.player.get_max_life(),
+                                       g.player.get_position().get_level(),
+                                       g.player.get_position().get_x(),
+                                       g.player.get_position().get_y()))
+                    .white()
+                    .on_blue(),
+                stats_area,
+            );
+        })?;
+        if event::poll(std::time::Duration::from_millis(16))? {
+            if let event::Event::Key(key) = event::read()? {
+                if key.kind == KeyEventKind::Press && key.code == KeyCode::Char('q') {
+                    break;
+                }
+                if key.kind == KeyEventKind::Press && key.code == KeyCode::Left {
+                    g.move_player(-1, 0);
+                }
+                if key.kind == KeyEventKind::Press && key.code == KeyCode::Right {
+                    g.move_player(1, 0);
+                }
+                if key.kind == KeyEventKind::Press && key.code == KeyCode::Up {
+                    g.move_player(0, -1);
+                }
+                if key.kind == KeyEventKind::Press && key.code == KeyCode::Down {
+                    g.move_player(0, 1);
+                }
+            }
+        }
+    }
+
+    stdout().execute(LeaveAlternateScreen)?;
+    disable_raw_mode()?;
+    Ok(())
 }

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,
         }
@@ -20,9 +20,17 @@ impl Player {
     pub fn get_name(&self) -> String {
         return self.name.clone();
     }
+    pub fn get_life(&self) -> i16 { self.life }
+    pub fn get_max_life(&self) -> i16 { self.max_life }
     pub fn change_life(&mut self, by: i16) {
         self.life = max(0, min(self.max_life, self.life + by));
     }
+    pub fn get_position(&self) -> Position {
+        self.position
+    }
+    pub fn change_position(&mut self, dx: i8, dy: i8) {
+        self.position.change(dx, dy);
+    }
 }
 
 #[test]

src/position.rs

@@ -1,15 +1,32 @@
+#[derive(Copy, Clone, Debug, PartialEq)]
 pub struct Position {
     level: u8,
-    x: u8,
-    y: u8,
+    x: u16,
+    y: u16,
 }
 
 impl Position {
-    pub fn new(level: u8, x: u8, y: u8) -> Self {
+    pub fn new(level: u8, x: u16, y: u16) -> Self {
         Self {
             level,
             x,
             y,
         }
     }
+    pub fn get_level(&self) -> u8 {
+        self.level
+    }
+
+    pub fn get_x(&self) -> u16 {
+        self.x
+    }
+
+    pub fn get_y(&self) -> u16 {
+        self.y
+    }
+
+    pub fn change(&mut self, dx: i8, dy: i8) {
+        self.x = ((self.x as i16) + dx as i16) as u16;
+        self.y = ((self.y as i16) + dy as i16) as u16;
+    }
 }