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.gitignore vendored
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target

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iced-tetris/Cargo.lock generated
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iced-tetris/Cargo.toml
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[package]
name = "iced-tetris"
version = "0.1.0"
edition = "2018"
resolver = "2"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
iced = { git = "https://github.com/hecrj/iced", rev = "099981cfc2f61a1f37e84100592d65babb94fb82", features = ["tokio", "canvas"] }
iced_native = { git = "https://github.com/hecrj/iced", rev = "099981cfc2f61a1f37e84100592d65babb94fb82"}
chrono = "0.4.19"
rand = "0.8.4"

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