Animationen für die Pixeldecke
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use std::env::args;
use std::io::stdout;
use std::io::Write;
use std::iter::repeat_with;
use std::thread::sleep;
use std::time::Duration;
use rand::thread_rng;
use rand::Rng;
use pixelfoo::color::Color;
use pixelfoo::point2d::Point2d;
use pixelfoo::rect2d::Rect2d;
use pixelfoo::v2;
use pixelfoo::vec2d::Vec2d;
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
enum Square {
Empty,
Grass,
Rabbit,
Fox,
}
struct Board(Vec<Vec<Square>>);
impl Board {
pub fn new(size: Vec2d, mut f: impl FnMut() -> Square) -> Board {
Board(
repeat_with(|| {
repeat_with(&mut f)
.take(size.x as usize)
.collect::<Vec<_>>()
})
.take(size.y as usize)
.collect::<Vec<_>>(),
)
}
pub fn size(&self) -> Vec2d {
let x_size = self.0[0].len() as i32;
let y_size = self.0.len() as i32;
v2!(x_size, y_size)
}
pub fn rect(&self) -> Rect2d {
Rect2d::new(0, self.size().x, 0, self.size().y)
}
pub fn get(&self, pos: Point2d) -> Square {
self.0[pos.y as usize][pos.x as usize]
}
pub fn set(&mut self, pos: Point2d, sq: Square) {
self.0[pos.y as usize][pos.x as usize] = sq;
}
}
fn send<T: Write>(w: &mut T, board: &Board) -> std::io::Result<()> {
let Board(lines) = board;
for line in lines {
for square in line {
let c = match square {
Square::Empty => Color::blue(),
Square::Grass => Color::green(),
Square::Rabbit => Color::yellow(),
Square::Fox => Color::red(),
};
w.write_all(&c.rgb())?;
}
}
w.flush()
}
const DEFAULT_ARG: usize = 10;
fn grow(board: &Board, pos: Point2d, grow: Square, die: Square) -> Square {
for pos1 in pos.neighbours() {
if board.rect().contains(pos1) {
let neigh_sq = board.get(pos1);
if neigh_sq == grow {
return grow;
}
}
}
die
}
fn main() -> std::io::Result<()> {
let args = args().collect::<Vec<_>>();
eprintln!("executing {}", args[0]);
let x_size = args[1].parse::<usize>().unwrap();
let y_size = args[2].parse::<usize>().unwrap();
let arg = args[3].parse::<usize>().unwrap_or(DEFAULT_ARG);
eprintln!("screen size {}x{}, arg {}", x_size, y_size, arg);
let mut rng = thread_rng();
let size = v2!(x_size as i32, y_size as i32);
let p_empty = 0.25;
let p_grass = 0.25;
let p_rabbit = 0.25;
// p_fox = 0.05
let mut board = Board::new(size, || {
let p = rng.gen::<f64>();
if p < p_empty {
Square::Empty
} else if p < p_empty + p_grass {
Square::Grass
} else if p < p_empty + p_grass + p_rabbit {
Square::Rabbit
} else {
Square::Fox
}
});
let t_frame = 0.040; // s
let delay = Duration::new(0, (1_000_000_000.0 * t_frame) as u32);
// mid point of the board
let x_mid = (x_size - 1) as f64 / 2.0;
let y_mid = (y_size - 1) as f64 / 2.0;
// radius of the death zone in the middle
let r = (x_size.min(y_size) - 1) as f64 / 2.5;
loop {
for _ in 0..arg {
let pos = board.rect().random_point(&mut rng);
let sq = board.get(pos);
let dx = (pos.x as f64 - x_mid as f64) / r as f64;
let dy = (pos.y as f64 - y_mid as f64) / r as f64;
let p0 = (dx * dx + dy * dy).min(1.0);
let p_survive = match sq {
Square::Empty => 1.0,
Square::Grass => p0,
Square::Rabbit => p0,
Square::Fox => 0.8 * p0,
};
let new_sq = if rng.gen::<f64>() < p_survive {
sq
} else {
Square::Empty
};
board.set(
pos,
match sq {
Square::Empty => grow(&board, pos, Square::Grass, new_sq),
Square::Grass => grow(&board, pos, Square::Rabbit, new_sq),
Square::Rabbit => grow(&board, pos, Square::Fox, new_sq),
Square::Fox => new_sq,
},
);
}
let mut buf = Vec::with_capacity(x_size * y_size * 3);
send(&mut buf, &board)?;
stdout().write_all(&buf)?;
stdout().flush()?;
sleep(delay);
}
}