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use crate::canvas::Canvas;
#[derive(Debug, Clone)]
pub struct State {
width: u32,
height: u32,
cells: Vec<bool>,
}
impl State {
pub fn new(width: u32, height: u32) -> State {
let cells = (0..width * height)
.map(|_| js_sys::Math::random() < 0.5)
.collect();
State {
width,
height,
cells,
}
}
pub fn neighbor_count(&self, x: u32, y: u32) -> u32 {
let mut count = 0;
for delta_x in [self.height - 1, 0, 1].iter().clone() {
for delta_y in [self.width - 1, 0, 1].iter().clone() {
let neighbor_x = (x + delta_x) % self.width;
let neighbor_y = (y + delta_y) % self.height;
if (*delta_x, *delta_y) != (0, 0) && self.is_on(neighbor_x, neighbor_y) {
count += 1;
}
}
}
count
}
pub fn next(&self) -> State {
let cells = (0..self.width * self.height)
.map(|i| {
let x = i % self.width;
let y = i / self.width;
let neighbor_count = self.neighbor_count(x, y);
neighbor_count == 3 || self.is_on(x, y) && neighbor_count == 2
})
.collect();
State {
width: self.width,
height: self.height,
cells,
}
}
fn is_on(&self, x: u32, y: u32) -> bool {
let inside_x = (x + self.width) % self.width;
let inside_y = (y + self.height) % self.height;
self.cells[(inside_x + inside_y * self.width) as usize]
}
pub fn draw(&self, canvas: &Canvas) {
canvas.clear();
for y in 0..self.height {
for x in 0..self.width {
if self.is_on(x, y) {
canvas.draw(x, y, "green");
}
}
}
}
}
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