const oddAngle = -0.33;

const evenAngle = 0.17;

const trunkWeight = 10;

​

function setup() {

  console.log('Build tree');

  const tree = Tree.create(maxIterations);

  console.log('Draw tree');

  drawTree(tree);

  console.log('Finished');

}

​

function drawTree(tree) {

  setupCanvas();

  moveToStart();

  drawBranch(tree.getRoot());

}

​

function setupCanvas() {

  createCanvas(innerWidth, innerHeight);

  background(0);

}

​

function  moveToStart() {

  resetMatrix();

  translate(width / 2, height);

}

​

function drawBranch(node) {

  if (!node)

    return;

  const isEven = node.value.isEven();

  const len = height / 200.0;

  const angle = isEven ? evenAngle : oddAngle; 

  const weight = 0.3 + node.count * trunkWeight / maxIterations;

  stroke(255);

  strokeWeight(weight);

  rotate(angle);

  line(0, 0, 0, -len);

  translate(0, -len);

​

  drawBranch(node.even);

  drawBranch(node.odd);

​

  translate(0, len);

  rotate(-angle);  

}

​