let number = 25;


function setup() {
  createCanvas(1280, 720);
  background(0);
  stroke(121, 84, 56, 150);
  strokeWeight(1);
  drawBar(width / 2, height - 10, 100, PI / 2, number);
}

function drawBar(x0, y0, length, theta, N) {

  if (N > 0) {
    let x = x0 + length * cos(theta);
    let y = y0 - length * sin(theta);

    line(x0, y0, x, y);

    if (N < number / 2) {
      stroke(49, 226, 22, 150 - 150 * (N / number));
      if (random(0.0, 1.0) < 0.8) {
        stroke(49, 226, 22, 20);
        drawBar(x, y, length * random(0.6, 1.0), theta + random(PI / 8, PI / 7), N - 1);
      }
      if (random(0.0, 1.0) < 0.8) {
        stroke(49, 226, 22, 20);
        drawBar(x, y, length * random(0.6, 1.0), theta - random(PI / 8, PI / 7), N - 1);
      }
    }
    else {
      //stroke(121, 84, 56, 150 * (N / number));

      if (random(0.0, 1.0) < 0.8) {
        stroke(121, 84, 56, 150 * (N / number));
        drawBar(x, y, length * random(0.6, 1.0), theta + random(PI / 8, PI / 7), N - 1);
      }
      if (random(0.0, 1.0) < 0.8) {
        stroke(121, 84, 56, 150 * (N / number));
        drawBar(x, y, length * random(0.6, 1.0), theta - random(PI / 8, PI / 7), N - 1);
      }
    }


  }

}

function keyPressed() {
  if (key == 's') {
    save('fractal_tree_simple.png');
  }
}