167 lines
4.4 KiB
Rust
167 lines
4.4 KiB
Rust
use std::env::args;
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use std::io::stdout;
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use std::io::Write;
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use std::iter::repeat_with;
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use std::thread::sleep;
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use std::time::Duration;
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use rand::thread_rng;
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use rand::Rng;
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#[derive(Clone, Copy, Debug)]
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struct Color(u8, u8, u8);
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#[allow(unused)]
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impl Color {
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fn black() -> Color {
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Color(0, 0, 0)
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}
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fn white() -> Color {
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Color(255, 255, 255)
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}
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fn gray50() -> Color {
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Color(128, 128, 128)
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}
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fn red() -> Color {
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Color(255, 0, 0)
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}
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fn green() -> Color {
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Color(0, 255, 0)
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}
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fn blue() -> Color {
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Color(0, 0, 255)
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}
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fn yellow() -> Color {
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Color(255, 255, 0)
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}
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fn cyan() -> Color {
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Color(0, 255, 255)
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}
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fn magenta() -> Color {
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Color(255, 0, 255)
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}
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fn complement(&self) -> Color {
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Color(255 - self.0, 255 - self.1, 255 - self.2)
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}
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}
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#[derive(Clone, Copy, Debug, PartialEq, Eq)]
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enum Square {
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Empty,
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Grass,
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Rabbit,
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Fox,
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}
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type Board = Vec<Vec<Square>>;
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fn send<T: Write>(w: &mut T, board: &Board) -> std::io::Result<()> {
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for line in board {
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for square in line {
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let Color(r, g, b) = match square {
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Square::Empty => Color::blue(),
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Square::Grass => Color::green(),
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Square::Rabbit => Color::yellow(),
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Square::Fox => Color::red(),
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};
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let buf = &[r, g, b];
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w.write_all(buf)?;
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}
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}
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w.flush()
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}
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const DEFAULT_ARG: usize = 10;
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fn grow(board: &Board, x: usize, y: usize, grow: Square, die: Square) -> Square {
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let x_size = board[0].len() as isize;
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let y_size = board.len() as isize;
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let x = x as isize;
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let y = y as isize;
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for (dx, dy) in vec![(1, 0), (0, 1), (-1, 0), (0, -1)] {
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let x1 = x + dx;
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let y1 = y + dy;
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if 0 <= x1 && x1 < x_size && 0 <= y1 && y1 < y_size {
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let neigh_sq = board[y1 as usize][x1 as usize];
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if neigh_sq == grow {
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return grow;
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}
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}
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}
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die
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}
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fn main() -> std::io::Result<()> {
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let args = args().collect::<Vec<_>>();
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eprintln!("executing {}", args[0]);
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let x_size = args[1].parse::<usize>().unwrap();
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let y_size = args[2].parse::<usize>().unwrap();
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let arg = args[3].parse::<usize>().unwrap_or(DEFAULT_ARG);
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eprintln!("screen size {}x{}, arg {}", x_size, y_size, arg);
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let mut rng = thread_rng();
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let p_empty = 0.25;
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let p_grass = 0.25;
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let p_rabbit = 0.25;
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// p_fox = 0.05
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let mut board = repeat_with(|| {
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repeat_with(|| {
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let p = rng.gen::<f64>();
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if p < p_empty {
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Square::Empty
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} else if p < p_empty + p_grass {
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Square::Grass
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} else if p < p_empty + p_grass + p_rabbit {
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Square::Rabbit
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} else {
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Square::Fox
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}
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})
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.take(x_size)
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.collect::<Vec<_>>()
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})
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.take(y_size)
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.collect::<Vec<_>>();
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let t_frame = 0.040; // s
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let delay = Duration::new(0, (1_000_000_000.0 * t_frame) as u32);
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let x_mid = (x_size - 1) as f64 / 2.0;
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let y_mid = (y_size - 1) as f64 / 2.0;
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let r = (x_size.min(y_size) - 1) as f64 / 2.5;
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loop {
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for _ in 0..arg {
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let x = rng.gen_range(0, x_size);
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let y = rng.gen_range(0, y_size);
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let sq = board[y][x];
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let dx = (x as f64 - x_mid as f64) / r as f64;
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let dy = (y as f64 - y_mid as f64) / r as f64;
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let p0 = (dx * dx + dy * dy).min(1.0);
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let p_survive = match sq {
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Square::Empty => 1.0,
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Square::Grass => p0,
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Square::Rabbit => p0,
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Square::Fox => 0.8 * p0,
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};
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let new_sq = if rng.gen::<f64>() < p_survive {
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sq
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} else {
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Square::Empty
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};
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board[y][x] = match sq {
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Square::Empty => grow(&board, x, y, Square::Grass, new_sq),
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Square::Grass => grow(&board, x, y, Square::Rabbit, new_sq),
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Square::Rabbit => grow(&board, x, y, Square::Fox, new_sq),
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Square::Fox => new_sq,
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};
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}
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let mut buf = Vec::with_capacity(x_size * y_size * 3);
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send(&mut buf, &board)?;
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stdout().write_all(&buf)?;
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stdout().flush()?;
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sleep(delay);
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}
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}
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