Industrial Machines 2

const w = 300;

const brushRadius = 5;

const dead = new Uint8Array([0, 0, 0, 255]);

const alive = new Uint8Array([255, 255, 255, 255]);

let grid = new Uint8Array(w * w);

let zoom;

let mat = [1, 1, -5];

​

function setup() {

  const m = min(windowWidth, windowHeight);

  createCanvas(m, m);

  background(0);

  zoom = w / m;

  pixelDensity(zoom);

  background(255);

  loadPixels();

  grid = grid.map((v) => (v = random(256)));

  sum = mat[0] + mat[1] * 4 + mat[2] * 4;

  mat = mat.map((e) => e / sum / 9);

}

​

function draw() {

  const newGrid = new Uint8Array(grid);

​

  for (let y = 1; y < w - 1; y++) {

    for (let x = 1; x < w - 1; x++) {

      const i = x + y * w;

      const self = grid[i];

      const sum1 = 

        grid[i - w] 

      + grid[i - 1] 

      + grid[i + 1] 

      + grid[i + w];

      const sum2 = 

        grid[i - 1 - w] 

      + grid[i + 1 - w] 

      + grid[i - 1 + w] 

      + grid[i + 1 + w];

      const sum = 

        self * mat[0]

      + sum1 * mat[1]

      + sum2 * mat[2];

      newGrid[i] = sum;

      col = sum > grid[i] ? alive : dead;

      pixels.set(col, i * 4);

    }

  }

  grid = newGrid;

  updatePixels();

}

​

function mouseDragged() {

  for (let dy = -brushRadius; dy <= brushRadius; dy++) {

    for (let dx = -brushRadius; dx <= brushRadius; dx++) {

      if (dx ** 2 + dy ** 2 > brushRadius ** 2) continue;

      const x = floor(mouseX * zoom + dx);

      const y = floor(mouseY * zoom + dy);

      if (0 <= x && x < w && 0 <= y && y < w) grid[x + y * w] = random(256);

    }

  }

}

​