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Use 2d stuff in predator & prey animation.

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This commit is contained in:
Juergen Stuber 2018-12-01 10:04:23 +01:00
parent 3389551f05
commit de52bca34e
1 changed files with 19 additions and 13 deletions
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32
src/bin/predprey/main.rs
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@ -9,6 +9,9 @@ use rand::thread_rng;
use rand::Rng;
use pixelfoo::color::Color;
use pixelfoo::p2;
use pixelfoo::point2d::Point2d;
use pixelfoo::vec2d::Vec2d;
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
enum Square {
@ -37,16 +40,13 @@ fn send<T: Write>(w: &mut T, board: &Board) -> std::io::Result<()> {
const DEFAULT_ARG: usize = 10;
fn grow(board: &Board, x: usize, y: usize, grow: Square, die: Square) -> Square {
let x_size = board[0].len() as isize;
let y_size = board.len() as isize;
let x = x as isize;
let y = y as isize;
for (dx, dy) in vec![(1, 0), (0, 1), (-1, 0), (0, -1)] {
let x1 = x + dx;
let y1 = y + dy;
if 0 <= x1 && x1 < x_size && 0 <= y1 && y1 < y_size {
let neigh_sq = board[y1 as usize][x1 as usize];
fn grow(board: &Board, pos: Point2d, grow: Square, die: Square) -> Square {
let x_size = board[0].len() as i32;
let y_size = board.len() as i32;
for dir in Vec2d::directions() {
let pos1 = pos + dir;
if 0 <= pos1.x && pos1.x < x_size && 0 <= pos1.y && pos1.y < y_size {
let neigh_sq = board[pos1.y as usize][pos1.x as usize];
if neigh_sq == grow {
return grow;
}
@ -92,9 +92,13 @@ fn main() -> std::io::Result<()> {
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 x = rng.gen_range(0, x_size);
@ -114,13 +118,15 @@ fn main() -> std::io::Result<()> {
} else {
Square::Empty
};
let pos = p2!(x as i32, y as i32);
board[y][x] = match sq {
Square::Empty => grow(&board, x, y, Square::Grass, new_sq),
Square::Grass => grow(&board, x, y, Square::Rabbit, new_sq),
Square::Rabbit => grow(&board, x, y, Square::Fox, new_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)?;