----- Coding Tutorial by Patt Vira ----- 

Name: NileRed Logo (BZ Reaction)

Video Tutorial: https://youtu.be/CicXI-WBgQ4

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Connect with Patt: @pattvira

https://www.pattvira.com/

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let a = [], b = [], c = [];

let cols, rows; let size = 4;

let p = 0, q = 1; 

let alfa = 1.2, beta = 1.0, gamma = 1.0;

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function setup() {

  createCanvas(400, 400);

  cols = width/size;

  rows = height/size;

  for (let x=0; x<cols; x++) {

    a[x] = [];

    b[x] = [];

    c[x] = [];

    for (let y=0; y<rows; y++) {

      a[x][y] = [random(0, 1), random(0, 1)];

      b[x][y] = [random(0, 1), random(0, 1)];

      c[x][y] = [random(0, 1), random(0, 1)];

    }

  }

}

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function draw() {

  background(220);

  for (let x=0; x<cols; x++) {

    for (let y=0; y<rows; y++) {

      let c_a = 0.0;

      let c_b = 0.0;

      let c_c = 0.0;

      for (let i=x-1; i<=x+1; i++) {

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

          let xIndex = (i + cols) % cols;

          let yIndex = (j + rows) % rows;

          c_a += a[xIndex][yIndex][p];

          c_b += b[xIndex][yIndex][p];

          c_c += c[xIndex][yIndex][p]; 

        }

      }

      c_a /= 9.0; 

      c_b /= 9.0;

      c_c /= 9.0;

      a[x][y][q] = constrain(c_a + c_a * (alfa * c_b - gamma * c_c), 0, 1);

      b[x][y][q] = constrain(c_b + c_b * (beta * c_c - alfa * c_a), 0, 1);

      c[x][y][q] = constrain(c_c + c_c * (gamma * c_a - beta * c_b), 0, 1);

    }

  }

  [p, q] = [q, p];

  for (let x=0; x<cols; x++) {

    for (let y=0; y<rows; y++) {

      noStroke();

      let val = a[x][y][p];

      let r = lerp(255, 150, val);

      let g = lerp(100, 210, val);

      let b = lerp(0, 255, val);

      fill(r, g, b);

      rect(x*size, y*size, size, size);

    }

  }

}

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