feat: speed property to PacMan

Cargo.lock

@@ -2,13 +2,6 @@
 # It is not intended for manual editing.
 version = 3
 
-[[package]]
-name = "Pac-Man"
-version = "0.1.0"
-dependencies = [
- "sdl2",
-]
-
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@@ -33,6 +26,14 @@ version = "0.2.147"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
 
+[[package]]
+name = "pacman"
+version = "0.1.0"
+dependencies = [
+ "lazy_static",
+ "sdl2",
+]
+
 [[package]]
 name = "sdl2"
 version = "0.35.2"

Cargo.toml

@@ -1,9 +1,10 @@
 [package]
-name = "Pac-Man"
+name = "pacman"
 version = "0.1.0"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+lazy_static = "1.4.0"
 sdl2 = { version = "0.35", features = ["image", "ttf", "mixer"] }

IMPLEMENTATION.md

@@ -0,0 +1,35 @@
+# Implementation
+
+A document detailing the implementation the project from rendering, to game logic, to build systems.
+
+## Rendering
+
+1. Map
+    - May require procedural text generation later on (cacheable?)
+2. Pacman
+3. Ghosts
+    - Requires colors
+4. Items
+5. Interface
+    - Requires fonts
+
+## Grid System
+
+1. How does the grid system work?
+
+The grid is 28 x 36 (although, the map texture is 28 x 37), and each cell is 24x24 (pixels).
+Many of the walls in the map texture only occupy a portion of the cell, so some items are able to render across multiple cells.
+24x24 assets include pellets, the energizer, and the map itself ()
+
+2. What constraints must be enforced on Ghosts and PacMan?
+
+3. How do movement transitions work?
+
+All entities store a precise position, and a direction. This position is only used for animation, rendering, and collision purposes. Otherwise, a separate 'cell position' (which is 24 times less precise, owing to the fact that it is based on the entity's position within the grid).
+
+When an entity is transitioning between cells, movement directions are acknowledged, but won't take effect until the next cell has been entered completely.
+
+4. Between transitions, how does collision detection work?
+
+It appears the original implementation used cell-level detection.
+I worry this may be prone to division errors. Make sure to use rounding (50% >=).

src/animation.rs

@@ -0,0 +1,90 @@
+use sdl2::{
+    rect::Rect,
+    render::{Canvas, Texture},
+    video::Window,
+};
+
+use crate::direction::Direction;
+
+pub struct AnimatedTexture<'a> {
+    raw_texture: Texture<'a>,
+    ticker: u32,
+    reversed: bool,
+    ticks_per_frame: u32,
+    frame_count: u32,
+    frame_width: u32,
+    frame_height: u32,
+}
+
+impl<'a> AnimatedTexture<'a> {
+    pub fn new(
+        texture: Texture<'a>,
+        ticks_per_frame: u32,
+        frame_count: u32,
+        frame_width: u32,
+        frame_height: u32,
+    ) -> Self {
+        AnimatedTexture {
+            raw_texture: texture,
+            ticker: 0,
+            reversed: false,
+            ticks_per_frame,
+            frame_count,
+            frame_width,
+            frame_height,
+        }
+    }
+
+    fn current_frame(&self) -> u32 {
+        self.ticker / self.ticks_per_frame
+    }
+
+    fn next_frame(&mut self) {
+        if self.reversed {
+            self.ticker -= 1;
+
+            if self.ticker == 0 {
+                self.reversed = !self.reversed;
+            }
+        } else {
+            self.ticker += 1;
+
+            if self.ticker + 1 == self.ticks_per_frame * self.frame_count {
+                self.reversed = !self.reversed;
+            }
+        }
+    }
+
+    fn get_frame_rect(&self) -> Rect {
+        Rect::new(
+            self.current_frame() as i32 * self.frame_width as i32,
+            0,
+            self.frame_width,
+            self.frame_height,
+        )
+    }
+
+    pub fn render(
+        &mut self,
+        canvas: &mut Canvas<Window>,
+        position: (i32, i32),
+        direction: Direction,
+    ) {
+        let frame_rect = self.get_frame_rect();
+        let position_rect = Rect::new(position.0, position.1, self.frame_width, self.frame_height);
+
+        canvas
+            .copy_ex(
+                &self.raw_texture,
+                Some(frame_rect),
+                Some(position_rect),
+                direction.angle(),
+                None,
+                false,
+                false,
+            )
+            .expect("Could not render texture on canvas");
+
+        self.next_frame();
+    }
+}

src/constants.rs

@@ -1,44 +1,95 @@
+use lazy_static::lazy_static;
+
 pub const BOARD_WIDTH: u32 = 28;
-pub const BOARD_HEIGHT: u32 = 36;
-pub const BLOCK_SIZE_24: u32 = 24;
-pub const BLOCK_SIZE_32: u32 = 32;
+pub const BOARD_HEIGHT: u32 = 37; // Adjusted to fit map texture?
+pub const CELL_SIZE: u32 = 24;
 
-pub const WINDOW_WIDTH: u32 = BLOCK_SIZE_24 * BOARD_WIDTH;
-pub const WINDOW_HEIGHT: u32 = BLOCK_SIZE_24 * BOARD_HEIGHT;
+pub const WINDOW_WIDTH: u32 = CELL_SIZE * BOARD_WIDTH;
+pub const WINDOW_HEIGHT: u32 = CELL_SIZE * BOARD_HEIGHT;
 
-pub const RAW_BOARD: &str = r###"
+#[derive(Debug, Copy, Clone, PartialEq)]
+pub enum MapTile {
+    Empty,
+    Wall,
+    Pellet,
+    PowerPellet,
+    StartingPosition(u8),
+}
 
+pub const RAW_BOARD: [&str; BOARD_HEIGHT as usize] = [
+    "                            ",
+    "                            ",
+    "                            ",
+    "############################",
+    "#............##............#",
+    "#.####.#####.##.#####.####.#",
+    "#o####.#####.##.#####.####o#",
+    "#.####.#####.##.#####.####.#",
+    "#..........................#",
+    "#.####.##.########.##.####.#",
+    "#.####.##.########.##.####.#",
+    "#......##....##....##......#",
+    "######.##### ## #####.######",
+    "     #.##### ## #####.#     ",
+    "     #.##    1     ##.#     ",
+    "     #.## ###==### ##.#     ",
+    "######.## #      # ##.######",
+    "      .   #2 3 4 #   .      ",
+    "######.## #      # ##.######",
+    "     #.## ######## ##.#     ",
+    "     #.##          ##.#     ",
+    "     #.## ######## ##.#     ",
+    "######.## ######## ##.######",
+    "#............##............#",
+    "#.####.#####.##.#####.####.#",
+    "#.####.#####.##.#####.####.#",
+    "#o..##.......0 .......##..o#",
+    "###.##.##.########.##.##.###",
+    "###.##.##.########.##.##.###",
+    "#......##....##....##......#",
+    "#.##########.##.##########.#",
+    "#.##########.##.##########.#",
+    "#..........................#",
+    "############################",
+    "                            ",
+    "                            ",
+    "                            ",
+];
 
-############################
-#............##............#
-#.####.#####.##.#####.####.#
-#o####.#####.##.#####.####o#
-#.####.#####.##.#####.####.#
-#..........................#
-#.####.##.########.##.####.#
-#.####.##.########.##.####.#
-#......##....##....##......#
-######.##### ## #####.######
-     #.##### ## #####.#
-     #.##    1     ##.#
-     #.## ###==### ##.#
-######.## #      # ##.######
-      .   #2 3 4 #   .
-######.## #      # ##.######
-     #.## ######## ##.#
-     #.##          ##.#
-     #.## ######## ##.#
-######.## ######## ##.######
-#............##............#
-#.####.#####.##.#####.####.#
-#.####.#####.##.#####.####.#
-#o..##.......0 .......##..o#
-###.##.##.########.##.##.###
-###.##.##.########.##.##.###
-#......##....##....##......#
-#.##########.##.##########.#
-#.##########.##.##########.#
-#..........................#
-############################
+lazy_static! {
+    pub static ref BOARD: [[MapTile; BOARD_HEIGHT as usize]; BOARD_HEIGHT as usize] = {
+        let mut board = [[MapTile::Empty; BOARD_HEIGHT as usize]; BOARD_HEIGHT as usize];
 
-                            "###;
+        for y in 0..BOARD_HEIGHT as usize {
+            let line = RAW_BOARD[y];
+
+            for x in 0..BOARD_WIDTH as usize {
+                if x >= line.len() {
+                    break;
+                }
+                
+                let i = (y * (BOARD_WIDTH as usize) + x) as usize;
+                let character = line
+                    .chars()
+                    .nth(x as usize)
+                    .unwrap_or_else(|| panic!("Could not get character at {} = ({}, {})", i, x, y));
+
+                let tile = match character {
+                    '#' => MapTile::Wall,
+                    '.' => MapTile::Pellet,
+                    'o' => MapTile::PowerPellet,
+                    ' ' => MapTile::Empty,
+                    c @ '0' | c @ '1' | c @ '2' | c @ '3' | c @ '4' => {
+                        MapTile::StartingPosition(c.to_digit(10).unwrap() as u8)
+                    },
+                    '=' => MapTile::Empty,
+                    _ => panic!("Unknown character in board: {}", character),
+                };
+
+                board[x as usize][y as usize] = tile;
+            }
+        }
+
+        board
+    };
+}

src/direction.rs

@@ -0,0 +1,18 @@
+#[derive(Debug, Copy, Clone, PartialEq)]
+pub enum Direction {
+    Up,
+    Down,
+    Left,
+    Right,
+}
+
+impl Direction {
+    pub fn angle(&self) -> f64 {
+        match self {
+            Direction::Right => 0f64,
+            Direction::Down => 90f64,
+            Direction::Left => 180f64,
+            Direction::Up => 270f64,
+        }
+    }
+}

src/entity.rs

@@ -0,0 +1,10 @@
+pub trait Entity {
+    // Returns true if the entity is colliding with the other entity
+    fn is_colliding(&self, other: &dyn Entity) -> bool;
+    // Returns the absolute position of the entity
+    fn position(&self) -> (i32, i32);
+    // Returns the cell position of the entity (XY position within the grid)
+    fn cell_position(&self) -> (u32, u32);
+    // Tick the entity (move it, perform collision checks, etc) 
+    fn tick(&mut self);
+}

src/game.rs

@@ -1,11 +1,99 @@
-pub struct Game {}
+use sdl2::image::LoadTexture;
+use sdl2::keyboard::Keycode;
+use sdl2::render::{TextureCreator, Texture};
+use sdl2::video::WindowContext;
+use sdl2::{pixels::Color, render::Canvas, video::Window};
 
-impl Game {
-    pub fn new() -> Game {
-        Game {}
+use crate::constants::{MapTile, BOARD, BOARD_HEIGHT, BOARD_WIDTH};
+use crate::direction::Direction;
+use crate::entity::Entity;
+use crate::pacman::{Pacman};
+
+pub struct Game<'a> {
+    canvas: &'a mut Canvas<Window>,
+    map_texture: Texture<'a>,
+    pacman: Pacman<'a>,
+    debug: bool,
 }
 
-    pub fn tick() {}
+impl Game<'_> {
+    pub fn new<'a>(
+        canvas: &'a mut Canvas<Window>,
+        texture_creator: &'a TextureCreator<WindowContext>,
+    ) -> Game<'a> {
+        let pacman_atlas = texture_creator
+            .load_texture("assets/32/pacman.png")
+            .expect("Could not load pacman texture");
+        let pacman = Pacman::new(None, pacman_atlas);
 
-    pub fn draw() {}
+        Game {
+            canvas,
+            pacman: pacman,
+            debug: true,
+            map_texture: texture_creator
+                .load_texture("assets/map.png")
+                .expect("Could not load pacman texture"),
+        }
+    }
+
+    pub fn keyboard_event(&mut self, keycode: Keycode) {
+        match keycode {
+            Keycode::D => {
+                self.pacman.direction = Direction::Right;
+            }
+            Keycode::A => {
+                self.pacman.direction = Direction::Left;
+            }
+            Keycode::W => {
+                self.pacman.direction = Direction::Up;
+            }
+            Keycode::S => {
+                self.pacman.direction = Direction::Down;
+            }
+            Keycode::Space => {
+                self.debug = !self.debug;
+            }
+            _ => {}
+        }
+    }
+
+    pub fn tick(&mut self) {
+        self.pacman.tick();
+    }
+
+    pub fn draw(&mut self) {
+        // Clear the screen (black)
+        self.canvas.set_draw_color(Color::RGB(0, 0, 0));
+        self.canvas.clear();
+        
+        self.canvas
+            .copy(&self.map_texture, None, None)
+            .expect("Could not render texture on canvas");
+
+        // Render the pacman
+        self.pacman.render(self.canvas);
+
+        // Draw a grid
+        for x in 0..BOARD_WIDTH {
+            for y in 0..BOARD_HEIGHT {
+                let tile = BOARD[x as usize][y as usize];
+                let color = match tile {
+                    MapTile::Empty => None,
+                    MapTile::Wall => Some(Color::BLUE),
+                    MapTile::Pellet => Some(Color::RED),
+                    MapTile::PowerPellet => Some(Color::MAGENTA),
+                    MapTile::StartingPosition(_) => Some(Color::GREEN),
+                };
+
+                if let Some(color) = color {
+                    self.canvas.set_draw_color(color);
+                    self.canvas
+                        .draw_rect(sdl2::rect::Rect::new(x as i32 * 24, y as i32 * 24, 24, 24))
+                        .expect("Could not draw rectangle");
+                }
+            }
+        }
+
+        self.canvas.present();
+    }
 }

src/main.rs

@@ -1,17 +1,22 @@
 use crate::constants::{WINDOW_HEIGHT, WINDOW_WIDTH};
-use sdl2::event::{Event, WindowEvent};
-use sdl2::image::LoadTexture;
+use crate::game::Game;
+use crate::textures::TextureManager;
+use sdl2::event::{Event};
 use sdl2::keyboard::Keycode;
 use sdl2::pixels::Color;
-use sdl2::render::{Texture, Canvas};
-use std::time::Duration;
+use sdl2::render::{Canvas, Texture};
+use std::time::{Duration, Instant};
 
 #[cfg(target_os = "emscripten")]
 pub mod emscripten;
 
-mod board;
 mod constants;
+mod direction;
 mod game;
+mod pacman;
+mod textures;
+mod entity;
+mod animation;
 
 fn redraw(canvas: &mut Canvas<sdl2::video::Window>, tex: &Texture, i: u8) {
     canvas.set_draw_color(Color::RGB(i, i, i));
@@ -28,7 +33,6 @@ pub fn main() {
     let window = video_subsystem
         .window("Pac-Man", WINDOW_WIDTH, WINDOW_HEIGHT)
         .position_centered()
-        .resizable()
         .build()
         .expect("Could not initialize window");
 
@@ -36,23 +40,26 @@ pub fn main() {
         .into_canvas()
         .build()
         .expect("Could not build canvas");
-    let texture_creator = canvas.texture_creator();
-
-    let map_texture = texture_creator
-        .load_texture("assets/map.png")
-        .expect("Could not load pacman texture");
 
     canvas
-        .copy(&map_texture, None, None)
-        .expect("Could not render texture on canvas");
+        .set_logical_size(WINDOW_WIDTH, WINDOW_HEIGHT)
+        .expect("Could not set logical size");
 
-    let mut i = 0u8;
+    let texture_creator = canvas.texture_creator();
+    let mut game = Game::new(&mut canvas, &texture_creator);
 
     let mut event_pump = sdl_context
         .event_pump()
         .expect("Could not get SDL EventPump");
 
+    game.draw();
+    game.tick();
+
+    let loop_time = Duration::from_millis(1000 / 60);
+
     let mut main_loop = || {
+        let start = Instant::now();
+
         for event in event_pump.poll_iter() {
             match event {
                 // Handle quitting keys or window close
@@ -61,23 +68,31 @@ pub fn main() {
                     keycode: Some(Keycode::Escape) | Some(Keycode::Q),
                     ..
                 } => return false,
-                event @ Event::KeyDown { .. } => {
-                    println!("{:?}", event);
-                },
-                Event::Window { win_event, .. } => {
-                    if let WindowEvent::Resized(width, height) = win_event {
-                        i = i.wrapping_add(1);
-
-                        canvas.set_logical_size(width as u32, height as u32).unwrap();
-                        redraw(&mut canvas, &map_texture, i);
-                    }
+                Event::KeyDown { keycode , .. } => {
+                    game.keyboard_event(keycode.unwrap());
                 },
                 _ => {}
             }
         }
 
-        canvas.present();
-        ::std::thread::sleep(Duration::from_millis(10));
+        let tick_time = {
+            let start = Instant::now();
+            game.tick();
+            start.elapsed()
+        };
+
+        let draw_time = {
+            let start = Instant::now();
+            game.draw();
+            start.elapsed()
+        };
+
+        if start.elapsed() < loop_time {
+            ::std::thread::sleep(loop_time - start.elapsed());
+        } else {
+            println!("Game loop behind schedule by: {:?}", start.elapsed() - loop_time);
+        }
+
         true
     };
 

src/pacman.rs

@@ -0,0 +1,64 @@
+use sdl2::{
+    render::{Canvas, Texture},
+    video::Window,
+};
+
+use crate::{animation::AnimatedTexture, direction::Direction, entity::Entity};
+
+pub struct Pacman<'a> {
+    // Absolute position on the board (precise)
+    pub position: (i32, i32),
+    pub direction: Direction,
+    speed: u32,
+    sprite: AnimatedTexture<'a>,
+}
+
+impl Pacman<'_> {
+    pub fn new<'a>(starting_position: Option<(i32, i32)>, atlas: Texture<'a>) -> Pacman<'a> {
+        Pacman {
+            position: starting_position.unwrap_or((0i32, 0i32)),
+            direction: Direction::Right,
+            speed: 2,
+            sprite: AnimatedTexture::new(atlas, 4, 3, 32, 32),
+        }
+    }
+
+    pub fn render(&mut self, canvas: &mut Canvas<Window>) {
+        self.sprite.render(canvas, self.position, self.direction);
+    }
+}
+
+impl Entity for Pacman<'_> {
+    fn is_colliding(&self, other: &dyn Entity) -> bool {
+        let (x, y) = self.position();
+        let (other_x, other_y) = other.position();
+        x == other_x && y == other_y
+    }
+
+    fn position(&self) -> (i32, i32) {
+        self.position
+    }
+
+    fn cell_position(&self) -> (u32, u32) {
+        let (x, y) = self.position();
+        (x as u32 / 24, y as u32 / 24)
+    }
+
+    fn tick(&mut self) {
+        let speed = self.speed as i32;
+        match self.direction {
+            Direction::Right => {
+                self.position.0 += speed;
+            }
+            Direction::Left => {
+                self.position.0 -= speed;
+            }
+            Direction::Up => {
+                self.position.1 -= speed;
+            }
+            Direction::Down => {
+                self.position.1 += speed;
+            }
+        }
+    }
+}

src/textures.rs

@@ -0,0 +1,29 @@
+
+use sdl2::{
+    image::LoadTexture,
+    render::{Texture, TextureCreator},
+    video::WindowContext,
+};
+
+pub struct TextureManager<'a> {
+    pub map: Texture<'a>,
+    pub pacman: Texture<'a>,
+}
+
+impl<'a> TextureManager<'a> {
+    pub fn new(texture_creator: &'a TextureCreator<WindowContext>) -> Self {
+        let map_texture = texture_creator
+            .load_texture("assets/map.png")
+            .expect("Could not load pacman texture");
+        
+        let pacman_atlas = texture_creator
+            .load_texture("assets/pacman.png")
+            .expect("Could not load pacman texture");
+        
+        
+        TextureManager {
+            map: map_texture,
+            pacman: pacman_atlas,
+        }
+    }
+}