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@ -0,0 +1,406 @@
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use iced::widget::canvas::{self, Path};
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use iced::{
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executor, keyboard, time, Application, Color, Command, Element, Length, Point, Rectangle,
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Settings, Size, Subscription,
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};
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use iced_native::{event, subscription, Event};
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use rand::distributions::{Distribution, Standard};
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fn main() -> iced::Result {
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Tetris::run(Settings::default())
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}
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struct Tetris {
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background_cache: canvas::Cache,
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blocks: BlockGrid,
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ticks: usize,
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paused: bool,
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}
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impl Tetris {
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fn new() -> Tetris {
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Tetris {
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background_cache: canvas::Cache::default(),
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blocks: BlockGrid::new(),
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ticks: 0,
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paused: false,
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}
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}
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}
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impl Application for Tetris {
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type Executor = executor::Default;
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type Message = Message;
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type Flags = ();
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fn new(_flags: ()) -> (Self, Command<Message>) {
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(Tetris::new(), Command::none())
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}
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fn title(&self) -> String {
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String::from("Tetris - Iced")
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}
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fn update(&mut self, message: Self::Message) -> Command<Message> {
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match message {
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Message::Pause => self.paused = !self.paused,
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Message::Tick(_) => {
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if !self.paused {
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self.ticks += 1
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}
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}
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Message::Up => (),
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Message::Down => {
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self.blocks.move_active_piece(MoveDirection::HardDrop);
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}
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Message::Left => {
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self.blocks.move_active_piece(MoveDirection::Left);
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}
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Message::Right => {
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self.blocks.move_active_piece(MoveDirection::Right);
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}
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};
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match self.blocks.active_piece {
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None => {
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let piece: Tetromino = rand::random();
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self.blocks.drop_piece(piece);
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}
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Some(_) => {
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if self.ticks % 10 == 0 {
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self.blocks.move_active_piece(MoveDirection::SoftDrop);
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}
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}
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};
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Command::none()
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}
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fn subscription(&self) -> Subscription<Message> {
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let keyboard_subscription = subscription::events_with(|event, status| {
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if let event::Status::Captured = status {
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return None;
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}
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match event {
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Event::Keyboard(keyboard::Event::KeyPressed { key_code, .. }) => {
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handle_keypress(key_code)
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}
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_ => None,
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}
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});
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let time_subscription = time::every(std::time::Duration::from_millis(50))
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.map(|_| Message::Tick(chrono::Local::now()));
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Subscription::batch([time_subscription, keyboard_subscription])
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}
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fn view(&mut self) -> Element<Self::Message> {
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canvas::Canvas::new(self)
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.width(Length::Fill)
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.height(Length::Fill)
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.into()
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}
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}
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impl<'a> canvas::Program<Message> for Tetris {
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fn draw(&self, bounds: Rectangle, _cursor: canvas::Cursor) -> Vec<canvas::Geometry> {
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let game_width = bounds.width / 3.0;
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let block_length = game_width / 10.0;
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let center = bounds.center();
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let top_left = Point::new(center.x - game_width / 2.0, 0.0);
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let background = self.background_cache.draw(bounds.size(), |frame| {
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let game_size = Size::new(block_length * 10.0, block_length * 20.0);
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let game_bg = Path::rectangle(top_left, game_size);
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frame.fill(&game_bg, Color::BLACK);
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});
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let block_size = Size::new(block_length, block_length);
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let mut frame = canvas::Frame::new(bounds.size());
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for (i, j, tetronimo) in self.blocks.iter() {
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let point = Point::new(
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i as f32 * block_length + top_left.x,
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j as f32 * block_length + top_left.y,
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);
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let block = Path::rectangle(point, block_size);
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let color = tetronimo.color();
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frame.fill(&block, color);
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}
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vec![background, frame.into_geometry()]
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}
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}
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fn handle_keypress(key_code: keyboard::KeyCode) -> Option<Message> {
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use keyboard::KeyCode;
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Some(match key_code {
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KeyCode::Up => Message::Up,
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KeyCode::Down => Message::Down,
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KeyCode::Right => Message::Right,
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KeyCode::Left => Message::Left,
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KeyCode::Space => Message::Pause,
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_ => return None,
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})
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}
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#[derive(Debug)]
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enum Message {
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Up,
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Down,
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Left,
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Right,
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Pause,
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Tick(chrono::DateTime<chrono::Local>),
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}
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struct BlockGrid {
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state: [[Option<Block>; 20]; 10],
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active_piece: Option<ActivePiece>,
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}
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#[derive(Debug, Copy, Clone)]
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struct ActivePiece {
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location: (u8, u8),
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tetromino: Tetromino,
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}
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impl ActivePiece {
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fn move_piece(&self, direction: &MoveDirection) -> ActivePiece {
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use MoveDirection::*;
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let (cur_x, cur_y) = self.location;
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ActivePiece {
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tetromino: self.tetromino,
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location: match direction {
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Left => (cur_x.checked_sub(1).unwrap_or(0), cur_y),
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Right => (cur_x + 1, cur_y),
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SoftDrop => (cur_x, cur_y + 1),
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HardDrop => (cur_x, cur_y),
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},
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}
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}
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}
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impl BlockGrid {
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fn new() -> BlockGrid {
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let mut state = [[None; 20]; 10];
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BlockGrid {
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state,
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active_piece: None,
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}
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}
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/// If it's impossible to drop a piece, return false
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fn drop_piece(&mut self, tetromino: Tetromino) -> bool {
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if let None = self.active_piece {
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let piece = ActivePiece {
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location: (4, 0),
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tetromino,
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};
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let piece_blocks = Self::piece_blocks(&piece);
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if self.piece_blocks_in_bounds(&piece_blocks) {
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self.active_piece = Some(piece);
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true
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} else {
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false
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}
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} else {
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false
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}
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}
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fn piece_blocks_in_bounds(&self, piece_blocks: &[(u8, u8); 4]) -> bool {
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piece_blocks.iter().all(|(x, y)| {
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let x = *x;
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let y = *y;
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x < 10 && y < 20 && self.state[x as usize][y as usize].is_none()
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})
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}
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/// If there is an active piece, and the move is legal, move it. Return true if it was possible
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/// to move an active piece, false otherwise.
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fn move_active_piece(&mut self, direction: MoveDirection) -> bool {
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let active = self.active_piece;
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match (active, direction) {
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(None, _) => false,
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(Some(piece), MoveDirection::Left | MoveDirection::Right) => {
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let new_piece = piece.move_piece(&direction);
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let new_blocks = Self::piece_blocks(&new_piece);
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if self.piece_blocks_in_bounds(&new_blocks) {
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self.active_piece = Some(new_piece);
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true
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} else {
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false
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}
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}
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(Some(ref piece), MoveDirection::HardDrop) => {
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let mut new_piece = *piece;
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loop {
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let p = new_piece.move_piece(&MoveDirection::SoftDrop);
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let new_blocks = Self::piece_blocks(&p);
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if self.piece_blocks_in_bounds(&new_blocks) {
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new_piece = p;
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} else {
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break;
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}
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}
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self.active_piece = Some(new_piece);
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self.place_active_piece();
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true
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}
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(Some(ref piece), MoveDirection::SoftDrop) => {
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let new_piece = piece.move_piece(&MoveDirection::SoftDrop);
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let new_blocks = Self::piece_blocks(&new_piece);
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if self.piece_blocks_in_bounds(&new_blocks) {
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self.active_piece = Some(new_piece);
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true
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} else {
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self.place_active_piece();
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false
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}
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}
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}
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}
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/// Remove the currently active piece and place its blocks onto the board.
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fn place_active_piece(&mut self) {
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if let Some(piece) = self.active_piece {
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let cur_blocks = Self::piece_blocks(&piece);
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for (x, y) in cur_blocks.iter() {
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self.state[*x as usize][*y as usize] = Some(Block {
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source: piece.tetromino,
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});
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}
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self.active_piece = None;
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}
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}
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fn piece_blocks(piece: &ActivePiece) -> [(u8, u8); 4] {
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use Tetromino::*;
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let (x, y) = piece.location;
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match piece.tetromino {
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I => [(x, y), (x, y + 1), (x, y + 2), (x, y + 3)],
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J => [(x, y), (x, y + 1), (x, y + 2), (x - 1, y + 2)],
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L => [(x, y), (x, y + 1), (x, y + 2), (x + 1, y + 2)],
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O => [(x, y), (x + 1, y), (x, y + 1), (x + 1, y + 1)],
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S => [(x, y + 1), (x + 1, y + 1), (x + 1, y), (x + 2, y)],
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T => [(x, y), (x + 1, y), (x + 2, y), (x + 1, y + 1)],
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Z => [(x, y), (x + 1, y), (x + 1, y + 1), (x + 2, y + 1)],
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}
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}
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fn active_piece_blocks(&self) -> Option<(Tetromino, [(u8, u8); 4])> {
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self.active_piece
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.as_ref()
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.map(|piece| (piece.tetromino, Self::piece_blocks(&piece)))
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}
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fn iter<'a>(&'a self) -> BlockGridIter<'a> {
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BlockGridIter::new(&self.state, self.active_piece_blocks())
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}
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}
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struct BlockGridIter<'a> {
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outer_state: &'a [[Option<Block>; 20]; 10],
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outer_active: Option<(Tetromino, [(u8, u8); 4])>,
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idx: usize,
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active_pice_idx: usize,
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}
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impl<'a> BlockGridIter<'a> {
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fn new(
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state: &'a [[Option<Block>; 20]; 10],
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outer_active: Option<(Tetromino, [(u8, u8); 4])>,
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) -> Self {
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BlockGridIter {
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outer_state: state,
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idx: 0,
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active_pice_idx: 0,
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outer_active,
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}
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}
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}
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impl<'a> std::iter::Iterator for BlockGridIter<'a> {
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type Item = (u8, u8, Tetromino);
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fn next(&mut self) -> Option<Self::Item> {
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loop {
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if self.idx >= 200 {
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return self.outer_active.and_then(|(tetromino, block_array)| {
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let i = self.active_pice_idx;
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self.active_pice_idx += 1;
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block_array.get(i).map(|(x, y)| (*x, *y, tetromino))
|
|
|
|
|
});
|
|
|
|
|
}
|
|
|
|
|
let i = self.idx % 10;
|
|
|
|
|
let j = self.idx / 10;
|
|
|
|
|
match self.outer_state[i][j] {
|
|
|
|
|
Some(block) => {
|
|
|
|
|
self.idx += 1;
|
|
|
|
|
return Some((i as u8, j as u8, block.source));
|
|
|
|
|
}
|
|
|
|
|
None => {
|
|
|
|
|
self.idx += 1;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#[derive(Debug, Clone, Copy)]
|
|
|
|
|
struct Block {
|
|
|
|
|
source: Tetromino,
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#[derive(Debug, Copy, Clone, PartialEq)]
|
|
|
|
|
enum MoveDirection {
|
|
|
|
|
Left,
|
|
|
|
|
Right,
|
|
|
|
|
HardDrop,
|
|
|
|
|
SoftDrop,
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
|
|
|
|
|
enum Tetromino {
|
|
|
|
|
I,
|
|
|
|
|
J,
|
|
|
|
|
L,
|
|
|
|
|
O,
|
|
|
|
|
S,
|
|
|
|
|
T,
|
|
|
|
|
Z,
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl Tetromino {
|
|
|
|
|
fn color(self) -> Color {
|
|
|
|
|
use Tetromino::*;
|
|
|
|
|
match self {
|
|
|
|
|
I => Color::from_rgb8(0, 255, 255),
|
|
|
|
|
J => Color::from_rgb8(0, 0, 255),
|
|
|
|
|
L => Color::from_rgb8(255, 165, 0),
|
|
|
|
|
O => Color::from_rgb8(255, 255, 0),
|
|
|
|
|
S => Color::from_rgb8(0, 255, 0),
|
|
|
|
|
T => Color::from_rgb8(255, 255, 0),
|
|
|
|
|
Z => Color::from_rgb8(128, 0, 128),
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl Distribution<Tetromino> for Standard {
|
|
|
|
|
fn sample<R: rand::Rng + ?Sized>(&self, rng: &mut R) -> Tetromino {
|
|
|
|
|
let index: u8 = rng.gen_range(0..=6);
|
|
|
|
|
match index {
|
|
|
|
|
0 => Tetromino::I,
|
|
|
|
|
1 => Tetromino::J,
|
|
|
|
|
2 => Tetromino::L,
|
|
|
|
|
3 => Tetromino::O,
|
|
|
|
|
4 => Tetromino::S,
|
|
|
|
|
5 => Tetromino::T,
|
|
|
|
|
6 => Tetromino::Z,
|
|
|
|
|
_ => unreachable!(),
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
Greg Shuflin